 OPERATING
 INSTRUCTIONS

               OPTIMA 312 –
          ES960C circuit board

THE AIR WE BREATHE
TABLE OF CONTENTS

1. Installation of Optima Design........................................................................................................................................ 3
       1.1 Installation of the Control Panel...................................................................................................................... 3
       1.2 Mounting................................................................................................................................................................... 3

2. Control Panel........................................................................................................................................................................ 4
3. Installation............................................................................................................................................................................. 4
4. Start-up.................................................................................................................................................................................. 5
5. Operation............................................................................................................................................................................... 6

       5.1 Operating and Changing Data in the Operating Menu.............................................................................. 6
       5.2 Main Menu................................................................................................................................................................ 7
       5.3 Date and Time.......................................................................................................................................................... 7
       5.4 Calendar.................................................................................................................................................................... 8
       5.5 User Menu................................................................................................................................................................. 8
       5.6 Display Menu........................................................................................................................................................... 9
       5.7 Info Menu............................................................................................................................................................... 10
       5.8 Service Menu........................................................................................................................................................ 11
       5.9 Schedule for Week Program........................................................................................................................... 17
       5.10 Defrosting Schedule....................................................................................................................................... 17
       5.11 Set Point Schedule.......................................................................................................................................... 18

6. Function............................................................................................................................................................................... 20
       6.1 Operation of Optima 312................................................................................................................................. 20
       6.2 Extra Capacity...................................................................................................................................................... 20
       6.3 Operating Reliability.......................................................................................................................................... 20

7. Maintenance....................................................................................................................................................................... 21
       7.1 Unit........................................................................................................................................................................... 21
       7.2 Water Circuit and Boiler................................................................................................................................... 21
       7.3 Dismantling/Taking the System Out of Service...................................................................................... 21

8. Troubleshooting................................................................................................................................................................ 22
       8.1 High-Pressure Pressure Switch...................................................................................................................... 22
       8.2 Immersion Heater's Safety Thermostat..................................................................................................... 22
       8.3 System Is Not in Operation............................................................................................................................. 22
       8.4 Air Faults................................................................................................................................................................ 22

2
1. INSTALLATION OF OPTIMA DESIGN

1.1 Installation of the Control Panel                         Underneath the control panel there is access for the:
                                                              A: Terminal block. Connection to main circuit board
The control panel is designed to be mounted onto a level      Fit a 4 x 0.25 mm2 low-current cable between the unit and
wall.                                                         the control panel. The maximum cable length is 50 m. The
                                                              voltage drop for cable lengths over 50 m is too high and can
1.2 Mounting                                                  cause operating trouble.

Find the installation place for the control panel, mark off   Method of Installation of the Wall Fixture:
the holes and screw the fixture securely onto the wall. Use
at least 4 screws for securing the panel, two at the top and  First screw the fixture securely onto a level wall and then
two at the bottom.                                            guide the cable visibly up from below.

Obligatory screw     Obligatory screw                         Connect the low-current cable to the terminal block. Check
                                                              that the cable is connected to the same numbers at both
Screw                Screw                                    ends (between the control panel and the main circuit board
                                                              in the unit.)
Obligatory screw     Obligatory screw
                                                              Clip the control panel to the wall fixture by guiding it down
                                                              from above, slightly slanting out at the bottom. Finish by
                                                              pressing it in at the bottom so that it is flat against the
                                                              wall. To disassemble, pull the control panel slightly slanting
                                                              out at the bottom and lift up.

Hold up the wall frame against the wall and mark off the
holes for fastening the frame. Drilling of holes, hole size
and suitable screws for fixing the panel all depend on the
wall material.

Place the control panel in the fixtures and tilt it in
against the wall. The four support points in the corners of
the display must touch the wall to keep the display stable.

Support              Support
point                point

Support              Support                                  Position  Description
point                point                                    1         Panel casing
                                                              2         Front of panel
                                                              3         Display pressure plate
                                                              4         Wall fixture
                                                              5         Display glass

                  A

		3
2. CONTROL PANEL 3. INSTALLATION

The control panel must be mounted on an interior wall that
is centrally located in the home. Since the control panel
can simultaneously function as a room thermostat, it is
important to observe, as follows (unless extract air
temperature control unit is used):

• Do not expose the control panel to direct sunlight
• Do not place the control panel on an outer wall
• Do not recess the control panel in the wall
• Do not place the control panel over a heat source

A lamp close to the control panel can affect the light sen-
sor and prevent the control panel from regulating the light
intensity as intended.

7 keys used for operating the panel are placed on the front
of the control panel in the ring. The function
of the keys changes depending on the menu selected.
(More information is available under Operation.)

There is an infrared movement sensor located under the
glass screen.
You can bring up the menu for the daily operating options
by just waving your hand by the control panel (it is possible
to turn this function off: See under Main menu/Display/
Menu item 5).

The following components are placed at the bottom of the
control panel:

1. SD card
2. Room sensor
3. Light sensor
4. Mini USB port for connection to computer

1: The removable SD card contains all the control models
and versions, which makes the control panel compatible
with older versions. The SD card also contains all the
languages, menus, help texts, symbols and collected data
logs. The current versions are installed in the control panel
during the start-up procedure so that the control unit can
function without the SD card. However, the help texts will
not appear in the display, and the data logs will not be
saved.

4: In order for a computer to be able to read the data logs,
the computer must have the Genvex data logger program
installed.

See the installation guide.

4
 4. START-UP

    The first time the system is started, the control panel dis-
    play will show: “Choose language”.
    Click “Next” to switch among Danish, English, German and
    French. Press “Enter” when your desired language is shown
    in the display. The control panel will now load the current
    program version in the selected language.
    The display will show:
    • Updating model (loading the current model)
    • Wait 1.5 minutes (It takes approximately 1.5 minutes to

      load the current version)
    • Language load (91)
    • Language OK
    • Menu load (84)
    • Menu OK
    • Icon load (369)
    • Menu OK
    • Reset to default
    • Restarting……..
    • Optima 312 UK
    The display will then change to:
    • Genvex logo
    • Optima 312 UK
    • Version number
    D (Control panel): X.X
    C (Main board): X.X
    Finally, the display changes to daily operation, and the
    system is now in operation with the factory setting, which
    is only a basic setting.
    The system is now ready to be fine-tuned with the most
    optimal air flows and operational desires and demands
    for the dwelling in question, e.g. weekly operation,
    temperatures, etc. to ensure that the system is used and
    operated as optimally as possible.

		5
5. OPERATION

Optima 312                                                   K3 – Immersion heater
All Genvex combined ventilation units and domestic hot       Use the key next to the symbol “Immersion heater” to
water heat pumps of the Combi 185 BP type for dwellings      change between + and ÷. If the symbol is set to “+”, the
are supplied with the Optima 312 control unit, which has a   immersion heater will automatically engage, as required. If
factory setting, which means that the system can be put      the symbol is set to “÷”, the immersion heater will not
into operation without further setup.                        engage, even if required. It is a precondition that item 3 in
                                                             the User Menu is set to ON.
The factory setting is a basic setting that should be
adapted to the operating desires and demands for the         K4 – Main Menu
home in question to ensure that the system is used and       Use this function to enter the main menu and access the
operated as optimally as possible.                           sub-items Date and time, Calendar, User menu, Display,
                                                             Info menu and Service menu.
5.1 Operating and Changing Data in the
Operating Menu                                               K5 – Filter
                                                             Use this function to reset the filter alarm.
Normally the symbols for the daily operating options are     The key next to the “Filter” symbol resets the alarm for
displayed, and the following keys are visible:               filter change. To reset the filter alarm, first change the
                                                             filters and press and hold the key with the “Filter” symbol
   K1         K7                                             until the exclamation mark in the symbol disappears.

   K2         K6                                             K6 – Information
                                                             Use this function to get an overview of the current operat-
                           K3 K4 K5                          ing condition of the unit, e.g. temperatures, fan settings,
                                                             relay status/function ON/OFF, alarms, timers, etc. Use the
K1 – Speed                                                   key next to the symbol “Info” to read off the operating con-
Use this function to set the fan speed                       dition of the unit. More information can be found in the
to levels 0-1-2-3-4.                                         main menu section under the item Info operation.

Use the key next to the “Speed” symbol to change among       K7 – Temperature
the 4 speeds. It is also possible to stop the system by      Use this function to set the room temperature. Press the
pressing and holding the key for 3-4 seconds on condition    key next to the “Temperature” symbol to enter a desired
that item 28 of the Service menu is set to ON.               temperature between 10 and 30 °C.
                                                             The current temperature will be displayed in the centre of
K2 – Forced operation (Party mode)                           the screen.
This feature makes it possible to set the timer for forced
operation to between 0 and 9 hours.                          Press the K4 key to enter the main menu and sub-menus,
                                                             where the following keys will change function:
Use pushbutton K2 to switch from 0 to 9 hours.
If the number of hours is set to 0, speeds 3 and 4 will run  K3 c hanges to “Arrow down ” and when the setting is
until the speed is changed manually. If the number of hours      changed to “÷”.
is set to between 1 and 9 hours, speeds 3 and 4 will auto-
matically reconnect to speed 2 after the set number of       K4 c hanges to “Enter”. Press “Enter” to proceed through
hours.                                                           the menus and sub-menus.

                                                             K5 c hanges to “Arrow up” and when the setting is changed
                                                                 to “+”..

                                                             K6 c hanges to “Exit”. Press “Exit” to return to the previous
                                                                 screen.

                                                             K7 changes to “Help”. Press “Help” to view a short
                                                                 description of the current menu item.

                                                             The horizontal arrow in the menu shows the current
                                                             location. To save changes to a menu item, finish by
                                                             pressing “Enter”.

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5.2 Main Menu                                                5.3 Date and Time

There is a “Book” K4 symbol lowermost in the centre of       Use this function to set and change the date and time.
the screen underneath the daily operating options. It
provides access to the main menu. Press this key to          01 Timer
enter the main menu.                                         Use this field to input the current hour. When switching
                                                             between summer and winter time, you have to set the
Date and time (item 4.3)                                     time one hour forward or back manually.

Calendar   (item 4.4)                                        02 Minutes
                                                             Use this field to input the current minute.
User menu  (item 4.5)
                                                             03 Weekday
Display    (item 4.6)                                        Use this field to input the current weekday.
                                                             04 Date
Info operation (item 4.7)                                    Use this field to input the current date.

Service menu (item 4.8)                                      05 Month
                                                             Use this field to input the current month.
“Arrow down” or “Arrow up” will change the symbol to a
horizontal arrow that indicates the current location.        06 Year
                                                             Use this field to input the current year.

Press “Enter” to access the sub-items of the current         Weekday       Month
menu. Press “Arrow down” or “Arrow up” again to select
the required sub-menu item. When the horizontal arrow        Monday     1  January    1
is next to a sub-menu item, the 2 lines will change place,
the font sizes will change, and the text “Set” will be add-  Tuesday    2  February   2
ed. Pressing ”Enter” next to the selected sub-menu item
will change the background of the item to grey. Use the      Wednesday  3  March      3
“+” and “÷” keys to change the current value. Press “Enter”
again to save the change. If no changes are required,        Thursday   4  April      4
press “Exit” to go back out of the menus.
                                                             Friday     5  May        5
Press “Help” to view a short help text about the menu
item on the screen. Press one of the keys to exit the help   Saturday   6  June       6
program.
                                                             Sunday     7  July       7
If none of the keys is pressed within a short period
of time, the control unit will automatically exit the                      August     8
programs.
                                                                           September  9

                                                                           October    10

                                                                           November   11

                                                                           December   12

		7
5.4 Calendar                                                      5.5 User Menu

Use this function to configure and change the setting of          01 – Temperature
each day of the week. Each day can be configured to run at        Use this field to set the room temperature. The room
different fan speeds, as required. It is possible to copy the     sensor is installed in the control panel.
configuration from one weekday to another. Here it is also
possible to choose ON or OFF, i.e. if there is nobody home        Setting range: between 10 and 30 °C.
for a period of time, the daily settings can be turned off,       Factory setting: 21 °C.
and the system will run according to a manual setting, for
example, level 1.                                                 02 – Domestic water
                                                                  Use this field to set the desired domestic hot water
01 – Calendar                                                     temperature.
Choose between controlling the system manually or
controlling the speed (air exchange) and temperature              Setting range: between 0 and 55 °C.
automatically, according to a fixed weekday program.              Factory setting: 52 °C.

If the menu item is set to OFF, the system will be controlled     03 – Immersion heater
manually according to the selected speed and temperature.         By configuring the set point to “ON”, the immersion heater
If the menu item is set to ON, the system will be controlled      will automatically engage, if necessary. If the set point is
according to the weekday programs entered in menu items           configured to “OFF”, the immersion heater will not engage,
02 to 08.                                                         even if there is a need for this.

Setting range: ON/OFF.                                            When the fresh air temperature is below 0 °C, it is recom-
Factory setting: OFF.                                             mended to connect the immersion heater as a supplement
                                                                  to the heating of the domestic hot water, thereby reducing
02 – Monday                                                       the heating time.
Up to 10 switching times can be entered for one day. The          Setting range: ON/OFF.
times can be input in a random order. Enter the hours in the      Factory setting: OFF.
first column, the minutes in the second and the speed in the
third column. Use the fourth column to input the tempera-         04 – Timer levels 3 and 4
ture difference by which the temperature should be lowered.       If the unit runs at speed 3 and 4 and the set point is set to
                                                                  ON, the unit will automatically reconnect to speed 2 after
Example: If the temperature is set to 21 ºC and you               the number of hours set in item 17 of the Service Menu. If
enter – 2.0 °C, the system will aim at 19 °C.                     the set point is set to OFF, the system will run at speed 3 or
                                                                  4 until it is manually changed to another speed. The timer
If the speed has been changed manually with the key during        can also be operated directly, with the key next to the sym-
the daily operation, the program will return to the weekday       bol for “Party mode” on the screen for daily operating
program when the next switching time passes.                      options.

   Examples of a weekday program:                                 Setting range: ON/OFF.
   01 07:30 H3 - 0.0                                              Factory setting: OFF.
   02 09:15 H1 -1.0
   03 17:00 H3 - 0.0                                              05 – Filter change
   04 18:00 H2 - 0.0                                              There is a built-in filter timer that counts how long the sys-
   05 23:30 H2 - 2.0                                              tem has been running since the most recent filter change.

It is not necessary to use all switching times.                   The set point can be set to between 1 and 12 months.We
If there is 0 in the entire line, the control unit will skip it.  recommend that the set point be initially set at 3 (3
                                                                  months).
03 to 08
These days can be filled in individually in the same way as       If the filters are too dirty after the set period, it is possible
under item 02.                                                    to set the set point to a lower number of months. If it is not
                                                                  necessary to change the filters after the set period, the set
09 – Copy day                                                     point can be set to a higher number of months.
Use this menu item to copy one day of the week to another,
where the same switching times, speeds and temperature            When the timer reaches the set value for filter change, the
lowering are required. Example: From Thursday to Tuesday          “Change filter” alarm will flash at the top of the screen saver.

8
Once the filters are changed, return to the screen with daily   to 10 minutes. The other automatic return connections can-
operating options and press and hold the key for the “Filter”   not be adjusted. If no key has been pressed within the time
symbol until the exclamation mark disappears and the sys-       intervals indicated below, it will automatically return to the
tem returns to normal operation.                                previous screen:

Setting range: Between 1 and 6 months. Input 0 in the filter    • Change in menu item back to menu item = 30 seconds
alarm to deactivate it. Note: Genvex assumes no responsibil-    • From menu item to main menu = 2 minutes
ity for damage that can be traced back to a deactivated filter  • From menu item to daily menu = 2 minutes
timer and lack of service that follows from it.
Factory setting: 3.                                             Setting range: between 1 and 10 minutes.
                                                                Factory setting: 10 min.

06 - Fugtighedsstyring                                          05 – Auto wake-up
                                                                It is possible to disengage the “Auto wake-up” function,
Her slås fugtighedsstyringen til. Den skal være indstillet til  where you can change from the screen saver to the screen
ON for at være aktiveret.                                       with the symbols for the daily operating options by waving
                                                                your hand past the control panel.
NB: fugtstyring er kun aktiv i trin 2 og trin 3 og kun når
varmepumpen ikke er aktiv. Funktionen er kun mulig på           Setting range: between 0 and 4.
Combi med fugtføler.                                            Factory setting: 1.

Indstillingsmulighed: ON/OFF.                                                       “0” OFF
                                                                                    “1” Max sensitive
5.6 Display Menu                                                                    “2” Level 2
                                                                                    “3” Level 3
Use the Display menu to set and change the following sub-                           “4” Least sensitive
menu items:
                                                                06 – Auto lightness
01 – Language                                                   The display is fitted with a motion sensor.
Use this option to choose among several different languag-      Setting range: ON/OFF.
es in the display.                                              Factory setting: ON.

02 – Program info                                               07 – Lightness day
Use this option to view what Optima is installed on the unit    Use this option to enter the maximum brightness level for
and what is its version number:                                 the control panel when the room is fully lit.

Example: Optima 312 UK D: 3.1 C: 1.0                            Setting range: between 0 and 100%.
D stands for the version number of the control panel.           Factory setting: 100%.
C stands for the version number of the main board.
                                                                08 – Lightness night
03 – Screen saver                                               Use this option to enter the minimum brightness level
Use this option to select the following settings:               required for the control panel when the room is completely
0: Screen saver off.                                            dark.
(ON and displaying daily operating options)
1: Screen saver off, but with light dimming                     Setting range: between 0 and 100%.
2: Room temperature + light dimming                             Factory setting: 30%.
3: Clock + light dimming
4: Clock and room temperature + light dimming                   09 – Lightness day screen saver
5: Black screen + light dimming

Setting range: between 0 and 5.
Factory setting: 3.

04 – Pause time
Use this option to set how long it should go from no opera-
tion of the symbols on the screen for daily operation until
the screen automatically returns to the screen saver. The
time to go from daily menu to screen saver can vary from 1

		9
Use this option to enter the maximum brightness level for       User menu without the password selected in item 18.
the screen saver when the room is completely lit.
                                                                Setting range: ON/OFF.
Setting range: between 0 and 100%.                              Factory setting: OFF.
Factory setting: 50%.
                                                                16 – Display
10 – Lightness night screen saver                               If this item is set to ON, you will not be able to access the
Use this to enter the minimum brightness level for the          Display menu without the password selected in item 18.
screensaver when the room is completely dark.
                                                                Setting range: ON/OFF.
Setting range: between 0 and 100%.                              Factory setting: OFF.
Factory setting: 0%.
11 – Reset to factory settings                                  17 – Service menu
If the set points are so configured that the system does not    If this item is set to ON, you will not be able to access the
function as expected and the reason for this cannot be          Service menu without the password selected in item 18.
established, there are 2 different options for resetting the
menu items to the factory settings:                             Setting range: ON/OFF.
                                                                Factory setting: OFF.
Press 1 to change all menu items
except the menu items for Speed (Level), Filter timer,          18 – Password
Calendar and Defrost temperatures to the factory settings.      Use this field to enter the selected password. In the future,
                                                                you will also have to use it in item 12 to access items 13 to
Press 2 to change all menu items to the factory settings.       18. If you forget your password, contact Genvex Service
                                                                department for assistance. To change the password, enter
Note: Before carrying out a reset, make sure that the           a new password in this item and press “Enter”. The password
current input values are noted down in the “Set Point           will now change.
Schedule”.
                                                                5.7 Info Menu
Setting range: between 0 and 2.
Factory setting: 0 mode.                                        I The “Info operation menu” provides an overview of the
                                                                current operating status of the unit.
12 – Safety menu                                                If you want to see the operating status of the system over a
It is possible to prevent access to selected main menu          period of operation, connect the control panel to a com-
items so that they can only be changed with a password,         puter and use the Optima data logger program.
which is a 4-digit figure. The first time, press 4 times 0 and  The system monitors the operating status every minute and
then “Enter”. This will open items 13 to 18. Select a pass-     stores the data on the SD card for up to one year..
word in item 18. This will be the password for accessing
menu items 13 to 18 in future.                                  Current temperature
                                                                Press “Enter” next to the Info menu. The first screen to be
13 – Date and time                                              displayed shows the current temperatures..
If this item is set to ON, you will not be able to access the
Date and time menu without the password selected in item        T1  Supply air
18.
                                                                T2 Room
Setting range: ON/OFF.
Factory setting: OFF.                                           T3 Fresh air

14 – Calendar                                                   T4 Discharge air
If this item is set to ON, you will not be able to access the
Calendar menu without the password selected in item 18.         T5 Before cooling coil

Setting range: ON/OFF.                                          T6 Cooling coil
Factory setting: OFF.
                                                                T7 Boiler, top

                                                                T8 Boiler, bottom

                                                                T9 Auxiliary sensor

15 – User menu
If this item is set to ON, you will not be able to access the

10
Current fan speed                                                       Hour counters (2 pages)
Press “Arrow down” to display the current fan speeds in per             Press “Arrow down” again to display the hour counters,
cent and the opening of the bypass damper and of the                    which count from the day the system is put into operation.
water valve.                                                            The figures displayed should be multiplied by 10. This is
                                                                        where you can see how many hours the system has been
              Supply air              in %                              running, how many hours the system has run at various
                                                                        speeds and how many hours the relays have been
              Extract air             in %                              connected (ON).

              Bypass damper           in %                                  Total time
                                                                            Level 0
              Water valve             in %                                  Level 1
                                                                            Level 2
Current setup of operating relays                                           Level 3
Press “Arrow down” again to display the current status of                   Level 4
the operating relays.                                                       Relay 1 Compressor
                                                                            Relay 2 Immersion heater
              R1 Compressor                                                 Relay 3 Electrical reheater
              R2 Immersion heater                                           New page comes up in the
              R3 Electrical reheater                                        display
              R4 Defrosting                                                 Relay 8 Help function
              R5 Domestic water
              R6 Room                                                       Relay 9 Help function
              R7 Extra cooling
              R8 Auxiliary relay 8
              R9 Auxiliary relay 9

Current list of alarms                                                  Press Exit to return to the main menu.
Press “Arrow down” once again to display the current
alarms. An alarm is activated If there is ON next to the                5.8 Service Menu
alarm.
                                                                        Use this function to set and change the following sub-menu
There is an alarm next to ON, which can also be seen on the             items.
screen saver and the display for daily operating options.               10 – Level 1 Supply air
                                                                        Level 1, which is the lowest speed, is usually used when
Which alarm it is is displayed in the “Info operation” menu.            there is nobody home. Both fans can be configured in-
When the timer reaches the set value for filter change, the             dependently of each other so that there is equal air flow in
“Change filter” alarm will flash at the top of the screen sav-          the supply air and in the extract air, which ensures optimal
er. Once the error has been corrected or the filter changed             operation. The system must be fine-tuned using specialised
and the alarm reset, the alarm will read OFF.                           air-measuring equipment. Such fine-tuning is possible
                                                                        without using the main regulating damper. It is not recom-
Error         Status       Error next to ”ON”                           mended to configure the air flows without expert advice.
reporting                                                               An incorrect configuration can lead to higher energy
              ON/          Filter not changed after 14 days./Frost      consumption or to an unpleasant indoor climate.
Control unit  OFF          protection error/The system is equipped
stopped                    with an external switch between terminals    Setting range: between 0 and 100%.
                           28 and 29.                                   Factory setting: 30%.
Change filter ON/          When these have short-circuited and the
                    OFF    system has stopped,                          11 – Level 2 Supply air
                           “Alarm” will be displayed.                   Level 2 is the recommended speed of the system for
Pressure      ON/                                                       providing optimal indoor climate, which should be adjusted
                           The filters must be changed                  to the ventilation needs of the home.
switch        OFF
                           The high-pressure pressure switch is         Setting range: between 0 and 100%.
Frost         ON/          disconnected due to excessive pressure in    Factory setting: 50%.
                           the cooling system.
protection OFF
                           The temperature of the water after the
Com error ON/              heater is too low (frost danger).
                    OFF
                           The control panel cannot communicate with
                           the main board (between the display and the
                           printed circuit board).

		11
12 – Levels 3 and 4 Supply air                                   18 – Filter/stop
Level 3 is the highest speed that can be configured. It is       To make sure that the filters are changed when the “Change
used, e.g. if there are many guests or a lot of activity in the  Filter” alarm flashes on the screen of the control panel, the
kitchen.                                                         set point can be set to ON. If the filters are not changed,
                                                                 the system will stop automatically after 14 days. If this
Setting range for level 3: between 0 and 100%.                   precaution is not required, the set point can be configured
Factory setting for level 3: 75%.                                to OFF, and the system will continue to operate.

Level 4 is used, in particular, in the summer in order to lower  Setting range: ON/OFF.
the indoor temperature. Remember that a higher air               Factory setting: OFF.
exchange rate increases energy consumption.
                                                                 19 – Immersion heater
Setting range for level 4: cannot be set                         If item 3 in the Service menu is set to ON and the key on
Factory setting for level 4: 100%.                               the control panel for the immersion heater is activated, the
                                                                 immersion heater will heat up the domestic water
13 – Level 1 Extract air                                         in the upper part of boiler to the set temperature.
The fan speed is adjusted until the air flow is the same as
the supply air in level 1.                                       Setting range: between 0 and 65 °C.
                                                                 Factory setting: 50 °C.
Setting range: between 0 and 100%.
Factory setting: 30%.                                            20 – Disinfection
14 – Level 2 Extract air                                         If the item is configured to ON, the immersion heater will
The fan speed is adjusted until the air flow is the same as      heat the domestic water up to 65 °C once a week in order to
the supply air in level 2.                                       disinfect the boiler regardless of the temperature setting.

Setting range: between 0 and 100%.                               Setting range: ON/OFF.
Factory setting: 50%.                                            Factory setting: OFF.
15 – Levels 3 and 4 Extract air
The air flow at level 3 is adjusted to the same air flow as      21 – Heating air
the supply air at levels 3 and 4 (item 12).                      The default setting of the control unit is OFF in order to
                                                                 give priority to domestic water heating before room
Setting range for level 3: between 0 and 100%                    heating. To change the priority, the set point must be
Factory setting for level 3: 75%.                                configured to ON.

Setting range for level 4: cannot be set                         Factory setting: OFF.
Factory setting for level 4: 100%.
                                                                 22 – Regulation water
16 – T2 Fine-tuning                                              If a water reheater with a motor-operated valve is installed
It is possible to fine-tune the room sensor of the control       in the system, it may be necessary to adjust the regulation
panel                                                            time. The less the regulation time, the faster the motor-
to make it possible to view the correct current room tem-        operated valve will regulate.
perature on the display.                                         Setting range: between 1 and 250 sec.
                                                                 Factory setting: 20 sec.
Setting range: between 0 and -5 °C.
Factory setting: -3 °C.                                          23 – Regulation power
                                                                 If an electric preheater or an electric reheater is installed,
17 – Timer levels 3 and 4                                        it may be necessary to adjust the regulation time.
If automatic reconnection is used for speeds 3                   Setting range: between 1 and 30 minutes.
or 4, it is possible to enter how many hours the system
should run at level 3 or 4 before it automatically returns to    Factory setting: 3 min.
level 2.
                                                                 24 – Minimum extract air
Setting range: between 1 and 9 hours.                            This is where the minimum extract air flow is set. The heat
Factory setting: 3 hours.                                        pump will not start with extract air flow below this setting.

                                                                 Setting range: between 0 and 100%.
                                                                 Factory setting: 30%.

12
25 – Electric heating coil                                                28 – System stop
Use this option to input if the installation is fitted with an            Use this option to choose if the system can be stopped by
electric heating coil:                                                    pressing the key for speed (K1) in the operating menu for
                                                                          3-4 seconds. If the value is OFF, the system cannot be
0 = No electric heating coil installed                                    turned off.
1 = Electric reheater installed
2 = Electric preheater installed                                          Setting range: ON/OFF.
                                                                          Factory setting: OFF.
Setting range: 0-2.
Factory setting: 0.                                                       29 – Stop defrosting
                                                                          The defrosting period ends by default when the evaporator
26 – Solar collector hysteresis (ºC)                                      reaches a temperature of 5 °C, which is the standard
If a solar collector is connected to the coil of the boiler, use          setting. Under special operating conditions where the
this option to input the temperature difference between the               evaporator is not completely defrosted, it may be neces-
temperature in the solar collector (T9) and the domestic                  sary to change this temperature to a higher value.
water temperature (T8) that should be reached before the
solar pump starts. The solar pump will not stop until T9 is               Setting range: between 0 and 15 °C.
equal to T8. The solar pump will stop under all circum-                   Factory setting: 5 °C
stances once T8 has reached a temperature of 60 °C.
Note: Only relevant for Combi with solar coil.                            Note: Changing this parameter without expert advice is not
                                                                          recommended.
Setting range: between 0 and 5 °C.
Factory setting: 5 °C.                                                    30 – Compressor start/stop
                                                                          The default temperature difference between start/stop
27 – Help function (Terminal H17 on the ES960 circuit                     compressor is ± 0.4 °C. Changing the temperature differ-
board) This function can be used for, as follows:                         ence is recommended under special operating conditions.

Set    Function                                                           Setting range: between 0.1 and 1.0 °C.
point                                                                     Factory setting: 0.4 °C.
0      The relay is off
1                                                                         Note: Changing this parameter without expert advice is not
2      The relay is on when the system is in operation. This option can   recommended.
3      be used, e.g. in order to open and close the fresh air damper and
4      the discharge air damper.                                          31 – Constant ON
5                                                                         If the home's other heating systems are not connected
       The relay is on when extra heat is required or when the circu-     to the heat pump system, the home's other heating sys-
6      lating pump should run when heating with water reheater is         tems, e.g. a wood-burning stove, can stop the heat pump so
7      required.                                                          that the heat pump system with heat exchanger only blows
8                                                                         preheated air into all rooms. This will cause increasing
       The relay is on when the “Change filter” alarm is active.          problems with draught as the temperature falls outside.
       This option can be used to activate an external alarm.             Systems without heat exchangers will blow fresh air
                                                                          directly inside.
       The relay is on when extra cooling is required. This function is
       used if the system is also fitted with a                           Setting the set point to ON will disconnect the room
       preheater.                                                         sensor. The unit will always operate and blow warm air in
                                                                          when the fresh air temperature is below the temperature
       The control unit can handle an earth heat exchanger using a        set in item 32. If the set point is configured to OFF, the
       damper. The relay will be on in case of one of the following two   room sensor will regulate the unit regardless of the fresh
       conditions:                                                        air temperature.
       The outdoor temperature, sensor T9, is lower than the value set
       in item 37 (frost protection temperature, typically set at 5 °C).  Setting range: ON/OFF.
       The outdoor temperature, sensor T9, exceeds by more than 1°        Factory setting: OFF.
       the temperature configured in item 1 and by more than 1° the
       current room temperature.                                          32 – Constant
                                                                          Use this option to set the desired fresh air temperature
       Floor heating control – The relay is switched on when the sen-     if constant ON is selected in item 31.
       sor in the tank bottom (T8) is greater than 30°C
                                                                          Setting range: between 0 and 10 °C.
       Floor heating control – The relay is switched on when the sen-     Factory setting: 5 °C.
       sor in the tank bottom (T8) is greater than 40°C

       The relay is switched on when the L1 terminal is short-circuit-
       ed/activated (extractor fan). This feature can be used e.g. in
       conjunction with a shut-off damper connected to the H17 relay
       which shuts off towards the bathroom when the extractor fan
       is activated.

Setting range: between 0 and 5.
Factory setting: 0.

		13
33 – Reduction                                                         37 – Earth heat exchanger
Lowering the supply air flow is recommended at very low                If an earth heat exchanger is fitted to the system and set
fresh air temperatures in order to improve the operating               point 5 in menu item 27 has been selected, it is possible to
conditions of the unit and to also achieve a higher supply air         configure the lowest temperature at which the earth heat
temperature, even though the same air flow continues to be             exchanger is to operate.
extracted.                                                             Setting range: between 0 and 10 °C.
Setting the set point to ON will lower the supply air flow             Factory setting: 0 °C.
when the fresh air temperature falls below the set
temperature. If the set point is set to OFF, there will be no          38 – Changing temperature scale
reduction in the supply air flow. This setting should be used          The menu is not in use.
with care if there is a wood-burning stove installed in the
home.                                                                  39 – Minimum air supply
                                                                       Use this option to set the minimum air flow for supply air.
Setting range: ON/OFF.                                                 The heat pump will not start with supply air flow below this
Factory setting: OFF.                                                  setting.

34 – Reduced supply air flow                                           Setting range: between 0 and 100%.
When the set point is set to ON in item 33, we recommend               Factory setting: 30%.
that
the fresh air temperature be set to -10 °C.                            40 – Minimum Air Mode
                                                                       0 = Off: If the value set for extract air or supply air is below
Setting range: between -15 and 0 °C.                                   the values set in items 24 and 39, respectively, the heat
Factory setting: -10 °C.                                               pump will not start when there is a need for air or water
                                                                       heating.

35 – Supply air speed                                                  1 = Winter: Should the actual operational settings for
When the set point in item 33 is set to ON, we recommend               extract air or supply air flow fall below the minimum set-
that the reduced supply air flow be configured to 20% low-             tings in items 24 and 39, respectively, and there is a need
er than the value set in item 11.                                      for the heat pump to operate, the extract air volume and
                                                                       supply air volume will rise to the set minimum air flow rates.
Setting range: between 0 and 100%.
Factory setting: 20%.                                                  On heat pump STOP, air volumes return to the values they
                                                                       had before the heat pump was started.

36 – Auxiliary relay 8 – (terminal H16 on the ES960 circuit            2 = Summer: When the heat pump operates in conjunction
board)                                                                 with air heating, the control unit responds as described in
Relay 8 can be used for the following functions:                       “1”.
                                                                       When the heat pump operates in conjunction with water
Set    Function                                                        heating
point                                                                  and the extract air flow falls below the setting in item 24, it
0      It is possible to connect the solar pump regulated in item 26.  will go up to the setting in item 24.
       The pump will stop when the T8 domestic hot water tempera-      The supply air volume will not change, but will remain at the
1      ture reaches 60 °C.                                             current setting.
2
       It is possible to connect a water reheater circulation pump.    On heat pump STOP, the extract air volume will return to the
3      The pump will only run when heat is required.                   setting it had before “Heat pump on”.

       The relay is on when the system is running.                     3 = Auto: When T3 (Fresh air) > 15 °C, regulation will be as if
       Can be used, e.g. in order to open and close the fresh air      the setting in this item was 2 “Summer”.
       damper and the discharge air damper.
                                                                       When T3 (fresh air) ≤ 15 °C, regulation will be as if the set-
       It is possible to connect the solar pump regulated in item 26.  ting in this item was 1 “Winter”.
       The pump will stop when the T8 domestic hot water tempera-      Setting range: 0-3
       ture reaches 52 °C.                                             Factory setting: 0

Setting range: between 0 and 3.                                        41 – Modbus Mode
Factory setting: 0.                                                    See a separate description of MODBUS
                                                                       Setting range: 0-2
                                                                       Factory setting: 0

14
42 – Modbus address                                            50 – Reheat Reg
See a separate description of MODBUS                           The reheat cycle function works, as follows: For example,
Setting range: 1-247                                           necessary output 50% and cycle = 60 sec means that the
Factory setting: 1                                             controller will switch the preheater on for 30 sec and off
                                                               for another 30 seconds.
43 – Electric preheater
If an electric preheater has been installed and Service menu   Note: Please refer to your country-specific regulations on
item 25 has been set to 2, use this option to input below the  limitations when adjusting this function.
fresh air temperature at which the electric preheater is
supposed to switch on.                                         The modulating reheater function refers to the value
                                                               adjusted in set point no. 01. The reheater will try to main-
Setting range: between -15 and 0 °C.                           tain a steady supply air temperature according to this set
Factory setting: 0 °C.                                         point.

44 – Preheat PI P                                              When using the modulating reheater, it will be necessary to
P-band for the PI controller for the electrical modulating     replace the inlet air temperature sensor (T1) in the ventila-
preheater.                                                     tion unit with a new temperature sensor installed upstream
The P-band controls the amplification of the controller fol-   of the reheater.
lowing a deviation from the set point (speeder)
                                                               51 – Bypass max
45 – Preheat PI I                                              Use this option to set the temperature at which the bypass
I-band for the PI controller for the electrical modulating     should
preheater. The function controls how quickly the controller    be 100% open. You set a temperature differential, which
adapts to a deviation of the set point (brake).                means that if you want the bypass to be 100% open, at e.g.
                                                               23 °C and if the set temperature in User menu item 1 is 20
46 – Preheat Reg                                               °C, this menu item should be set to 3 °C.
The preheat cycle function works, as follows: E.g. necessary
output 50% and cycle = 60 sec means that the controller        The bypass will open, provided that:
will switch the preheater on for 30 sec and then off for       1. The extract air temperature is higher than the fresh air
another 30 sec.
                                                                   temperature.

Note: Please refer to your country-specific regulations on     2. The fresh air temperature is above the temperature set
limitations when adjusting this function.                          in the Service menu menu 52.

The modulating preheater function refers to the value          The bypass opens when the temperature reaches the set
adjusted in set point no. 43. The preheater will try to main-  point in User menu item 1 + the temperature differential
tain a steady outdoor air temperature according to this set    set in this menu item.
point. When the modulating preheater is used, the existing
outdoor air temperature sensor (T3), which is built into the   Note. The bypass and reheater cannot run simultaneously.
ventilation unit, can be used as reference. No extra temper-
ature sensor is required.                                      52 – Close bypass at low fresh air
                                                               To prevent the bypass damper from opening at fresh air
47 – Reheat offset                                             temperatures and from blowing cold, unheated air into the
Offset for reheater with reference to the set point for the    dwelling, use this function to configure the lowest fresh air
requested temperature on the display (user menu 01).           temperature at which the damper must be closed. The value
For example, the desired temperature = 20 °C offset val-       is an expression of the greatest difference that may exist
ue=2 the reheater will try to maintain a supply air tempera-   between the temperature configured in item 1 and the low-
ture of 18 °C.                                                 est fresh air temperature. Setting range: Between 0 and 20
                                                               °C. If 0 °C is selected, the function is turned completely off.

48 – Reheat PI P                                               53 – Method of regulation
P-band for the PI controller for the electrical modulating     Use this option to set which sensor will be used as a refer-
reheater. The P-band controls the amplification of the con-    ence point for the desired set point temperature.
troller following a deviation from the set point (speeder).
                                                               There are 2 options:
49 – Reheat PI I                                               1. Extract air sensor in unit (T2S)
I-band for the PI controller for the electrical modulating     2. Sensor in display (T2)
preheater. The function controls how quickly the controller
adapts to a deviation of the set point (brake).

		15
If it is not possible to place the display with the built-in   Options:
temperature sensor in a room that is “representative” for      0 = the function is disabled
the overall temperature in the entire home, we recommend       1 = 1 damper is connected
that you use the T2S extract air sensor as reference sensor.   2 = 2 dampers are connected
                                                               3 = 3 dampers are connected
54 – Demand control                                            4 = 4 dampers are connected
This feature allows the connection of an external 0–10 volt
signal which can be used to force-control fans to a higher     60 – Fire test now*
speed as a result of an intensification of the signal.         0 = auto, dampers are tested 1 time per week in accordance
                                                               with the schedule.
The function is only active in fan steps 2 and 3 and requires
the humidity control to be disabled (user menu 06).            1 = Fire test now, this function force starts a functional
                                                               test of fire dampers. The result will appear on the display
The factory setting is 0%, which disables the demand           and be logged on the SD card (note: there will be a delay of
control. The working range of the allowable increase in        up to 240 seconds from when the test starts to when the
fan speed can be limited by setting it from 0–100%             test has been performed).

Example: working range of 100%. Here, 5 volts will increase    2 = reset fire alarm, in case of errors during damper test,
the speed by +50%                                              triggered damper/smoke detector or a lack of commu-
                                                               nication, the ventilation unit will be shut down and an alarm
Example: working range of 50%. Here, 5 volts will increase     symbol will appear on the display. In order to restart the
the speed by +25%                                              system, perform a reset of the fire control system.

55 – Humidity max. temperature**                               61 – Fire test day*
Sets the end point for the outdoor temperature                 Calendar of when the automatic weekly fire/smoke damper
compensation (T3).                                             test will be performed
                                                               1 = Monday
Options: 5–25°C.                                               2 = Tuesday
                                                               3 = Wednesday
56 – Humidity max. value**                                     4 = Thursday
Setting the end point of the outdoor temperature               5 = Friday
compensation, (desired max. humidity value).                   6 = Saturday
                                                               7 = Sunday
Options: 35–85 %.
                                                               62 – Fire test hour*
57 – Humidity fan speed**                                      schedule for when the automatic fire/smoke damper test
Sets how much the fan speed can deviate from the desired       will be performed.
fan speed.
                                                               Options: 1–24

Options: 5–30 %.                                               *NOTE – This function can only be used in conjunction with
                                                               the ES960CC PCB and ES1048 firebox.
58 – Humidity control frequency**
Sets the desired frequency for how often the fan speed         When activating menu 59, under the Info menu, a ‘FireTST’
can be changed.                                                point will be added which indicates the time when the last
                                                               fire test was performed, as well as the status of this test.
The function is defined as 1% per unit of time.
                                                               Furthermore, there will be a ‘Fire alarm’ point which, if listed
Options: 1–60 mins.                                            as ON, will indicate damper errors and simultaneously iden-
                                                               tify which damper is failing. If Fire alarm is OFF after per-
59 – Fire damper*                                              forming ‘fire test now point 60’ and setting the correct
If the Genvex Optima controller is used in a fire and smoke    number of dampers, the installation has been done
safety system, this menu allows the setting of the number      correctly.
of dampers which are connected to the Optima controller
and need to be monitored.

                                                               ** Humidity control parameters are only relevant to Combi
                                                               models with humidity sensors.

16
5.9 Schedule for Week Program

                   Monday                                         Tuesday                                    Wednesday

            Hours  Minutes Speed  Red. T2                  Hours  Minutes Speed  Red. T2              Hours  Minutes Speed  Red. T2

 1)                                             1)                                         1)
 2)                                             2)                                         2)
 3)                                             3)                                         3)
 4)                                             4)                                         4)
 5)                                             5)                                         5)
 6)                                             6)                                         6)
 7)                                             7)                                         7)
 8)                                             8)                                         8)
 9)                                             9)                                         9)
10)                                            10)                                        10)

            Hours  Thursday       Red. T2                  Hours   Friday        Red. T2              Hours  Saturday       Red. T2

 1)                Minutes Speed                1)                Minutes Speed            1)                Minutes Speed
 2)                                             2)                                         2)
 3)                                             3)                                         3)
 4)                                             4)                                         4)
 5)                                             5)                                         5)
 6)                                             6)                                         6)
 7)                                             7)                                         7)
 8)                                             8)                                         8)
 9)                                             9)                                         9)
10)                                            10)                                        10)

5.10 Defrosting Schedule                                                                                     Sunday

                                                                                                      Hours  Minutes Speed  Red. T2

Sensor TP before        Sensor TP cooling                                                  1)
cooling surface °C      surface °C                                                         2)
                                                                                           3)
                    15                     -2                                              4)
                                                                                           5)
                    14                     -2                                              6)
                                                                                           7)
                    13                     -2                                              8)
                                                                                           9)
                    12                     -2                                             10)

                    11                     -2

                    10                     -2

                    9                      -2

                    8                      -2

                    7                      -2

                    6                      -2

                    5                      -2                                             Red. T2 = Reduced room temperature
                                                                                          (Night set-back)
                    4                      -2

                    3                      -3

                    2                      -4

                    1                      -4

                    0                      -5

                    -1                     -6

                    -2                     -6

                    -3                     -7

                    -4                     -7

		17
5.11 Set Point Schedule                  Factory setting:     Configuration area   Date  Date  Date  Date
                                                      21 °C          10 - 30 °C
   Item Heading                                       52 °C            0 - 55 °C
   (5.5) 1 Temperature                                 OFF             ON/OFF
                                                       OFF             ON/OFF
           2 Domestic water
           3 Immersion heater                   3 months      0 to 12 months
           4 Timer levels 3 and 4                      OFF             ON/OFF
           5 Filter change                            30%             0 - 100%
           6 Humidity control                         50%             0 - 100%
  (5.8) 10 Level 1 Supply air                                         0 - 100%
          11 Level 2 Supply air                75/100%                0 - 100%
          12 Levels 3 and 4 Supply air                30%             0 - 100%
          13 Level 1 Extract air                      50%             0 - 100%
          14 Level 2 Extract air                                      ÷ 5 - 0 °C
          15 Levels 3 and 4 Extract air        75/100%
          16 T2 Fine-tuning                           ÷3 °C         1 - 9 hours
          17 Timer levels 3 and 4                                      ON/OFF
          18 Filter / stop                         3 hours             0 - 65 °C
          19 Immersion heater                          OFF             ON/OFF
          20 Disinfection                                             ON / OFF
          21 Heating air                              50 °C
          22 Regulation water                          OFF         1 - 250 sec.
          23 Regulation power                          OFF          1 - 30 min.
          24 Min extract air                                          0 - 100%
          25 Electric heating coil                 20 sec.
          26 Solar collector                         3 min.                   0-2
          27 Help functions                           30%                0 - 5 °C
          28 System stop
          29 Stop defrosting                               0                0-8
          30 Compressor start/stop                     5 °C            ON/OFF
          31 Constant ON                                               0 - 15 °C
          32 Constant                                      0        0.1 - 1.0 °C
          33 Reduction                                 OFF             ON/OFF
          34 Reduced supply air flow                   5 °C            0 - 10 °C
          35 Supply air speed                        0.4 °C            ON/OFF
          36 Auxiliary relay 8                         OFF           ÷15 - 0 °C
          37 Earth heat exchanger                      5 °C           0 - 100%
          38 Changing temperature scale                OFF         0/1/2/3
          39 Minimum supply air                     ÷10 °C             0 - 10 °C
          40 Minimum Air Mode                         20%              ON/OFF
          41 Modbus Mode                                              0 - 100%
          42 Modbus Address                                0           0/1/2/3
          43 Electric preheater                        0 °C
          44 Preheat PI (P)                            OFF                0/1/2
          45 Preheat PI (I)                           30%                 1-247
          46 Preheat Reg. (s)                                         -15 - 0 °C
          47 Reheat offset (-)                             0             1 - 255
          48 Reheat PI (P)                                 0              1-255
          49 Reheat PI (I)                                 1            10-120
          50 Reheat Reg. (s)                           0 °C             0-20 °C
                                                           5             1 - 255
18                                                     200                1-255
                                                         40             10-120
                                                           2
                                                           5
                                                       200
                                                         40
51 Bypass maximum                         3        1-10
52 Close bypass at low fresh air          4    0-20 °C
53 Reg. form (1=T2S 2=T2D)                2
54 Demand control                         0          1-2
55 Humidity max. temperature         15°C     0-100%
56 Humidity max. value              60 %
57 Humidity fan speed               15 %        5-25°C
58 Humidity control frequency     10 min.    35-85 %
59 Fire damper                            0
60 Fire test now                          0    5-30 %
61 Fire test day                          3  1-60 min.
62 Fire test hour                       12
                                                     0-4
                                                     0-2
                                                     1-7
                                                   1-24

		19
6. FUNCTION

6.1 Operation of Optima 312                                   6.3 Operational Reliability

A Combi unit is used for heating domestic water and supply    High-pressure pressure switch
air in order to cover the ventilation needs of the home and   In order to prevent the compressor from exceeding its
partial basic heating.                                        range of application, there is a built-in high-pressure
                                                              pressure switch that will disconnect when the pressure
Domestic water heating                                        becomes too high. Activate the red reset button on the
The temperature of the domestic water is controlled by        pressure switch
sensor T8, which is fitted at the bottom of the boiler. When  once the cause of the fault has been established.
the domestic water needs to be heated, the compressor
starts, solenoid valves MA 3 and MA 6 open, and the           Safety thermostat
domestic water is heated to the configured domestic water     If a fault occurs in the immersion heater for heating of
temperature.                                                  domestic water, the safety thermostat will disconnect. To
                                                              reconnect the safety thermostat, press the small button in
Room heating                                                  the middle of the thermostat.
Solenoid valves MA 2 and MA 5 are activated for room
heating. Room temperature is controlled by room sensor        The thermostat is located in the middle of the boiler.
T2, which is fitted in the control panel, or by extract air   Remember to disconnect the power to the system
sensor T2S, which is fitted in Combi 185. If this tempera-    before engaging in an intervention. Such intervention may
ture has been set to, e.g. 2 °C, the compressor will start    only be performed by
when the room temperature falls to 20.6 °C. The compres-      authorised personnel.
sor will stop when it has increased the room temperature to
21.4 °C. If the compressor cannot maintain the room           Overriding the supply air fan
temperature, the motor-operated valve (systems with           If the supply air temperature exceeds 45 °C, the speed
water reheaters) will begin to regulate (PI regulation) once  of the supply air fan will begin to increase.
the room temperature has fallen to 20 °C.                     The supply air temperature will be maintained at 45 °C, if
                                                              possible.
For systems with electrical reheaters, level 1 will engage
when the room temperature falls to 20 °C. When the room
temperature again reaches 21 °C, the electrical heater will
disengage.

No heat requirement
When neither domestic water heating nor room heating is
required, the compressor stops, but the fans continue to
run and the heat of the extract air is recovered in the
counter current heat exchanger and transferred to the
supply air.

Defrosting
The system begins to defrost when the difference between
the temperature before the cooling coil and the tempera-
ture of the cooling coil becomes too big, which occurs when
ice forms on the cooling coil. Solenoid valve MA 4 opens,
the supply air fan and the electrical heaters stop until the
ice has melted and the cooling coil has reached a tempera-
ture of about 5 °C (depends on the value set in menu 29).
The solenoid valve then closes again, and the supply air fan
and the electrical heating coils start again.

6.2 Extra Capacity

Immersion heater
If the heat requirement exceeds the capacity of the Combi
unit, the immersion heater can be configured to ON using
the shortcut key in the main menu. When the immersion
heater is set to ON, sensor T7, which is mounted in the
middle of the boiler, will heat the upper part of the DHW
boiler to the temperature that is set.

20
7. MAINTENANCE

To achieve optimal performance, follow the instructions            7.2 Water Circuit and Boiler
below:
                                                                   Safety valve
       Before opening the unit, disconnect power / pull out the    In connection with the domestic water boiler, the installer
       plug and wait until the fans have stopped completely.       has fitted a safety valve next to the cold water tap. The
                                                                   function of this valve is to protect the boiler against
Check that the condensation outlet is working a couple of          overpressure when domestic water expands under heating.
days after the primary installation.
                                                                   The non-return (check) valve that is fitted before the safety
Environmental requirements                                         valve on the cold water pipe prevents the water from flow-
When repairing or dismantling the unit, observe the statu-         ing back into the cold water pipe. The pressure increases to
tory and environmental regulations and requirements                the maximum of the safety valve. Then the safety valve
regarding recycling and destruction of various materials.          opens, and the excess water flows away. If the safety valve
                                                                   does not open, the boiler will burst. To ensure that the safe-
7.1 Unit                                                           ty valve is functional, it should be inspected several times a
                                                                   year. To test it, press the handle on the safety valve and
Filters                                                            ensure that the water can drain away. Damage that has
Change the filters when the “change filter” alarm flashes on       occurred due to a blocked safety valve is not covered by
the display of the control panel. Stop the unit using the          the guarantee.
circuit breaker of the unit or the circuit breaker of the
terminal board. Open the front cover/filter drawers and            7.2.1 Anode (only relevant to Combi with enamelled tank)
remove the filters. After changing the filters, reset the filter   In order to prevent corrosion of the enamelled hot water
timer. The time interval for cleaning/changing the filters can     tank, it has been equipped with a magnesium anode which
be adjusted in the operating menu.                                 is mounted in the middle of the tank.

       The discs are sharp, be careful not to cut yourself.        The anode has a life expectancy of around 2–5 years. How-
       Do not damage the discs. Vacuum cleaning or using           ever, caution should be taken to ensure that the anode is
       pressurised air on the filters is not recommended as it     intact. Every two years, it is recommended that the anode
       may impair filter performance.                              is inspected and replaced if it has been corroded and shows
                                                                   a diameter of around 6–10 mm.
                        G4 = Standard filter (Coarse filter class
                                G4)                                When the anode is to be inspected, the voltage must be dis-
                                                                   connected before removing the front cover.
                        F5 = Fine filter (Fine filter class F5)
                        F7 = Pollen filter (Fine filter class F7)  The hot water tank must be emptied of water before it is
                                                                   possible to remove the anode. To do this, turn off the cold
Condensed water and condensation outlet                            water supply and attach a hose to the drain valve so that
The condensation trays must be cleaned of dirt every               water from the tank can run out into the nearest drain.
autumn. Fill the condensation trays with water and check           When draining the water, open a hot water tap in order to
that the water drains away. If not, the outlets must be            prevent negative pressure in the tank. When the tank has
cleaned. Also check that the evaporator discs are clean.           been emptied, the anode can be unscrewed and serviced.
                                                                   Once the anode has been fitted again, close the drain valve,
Heat exchanger                                                     reactivate the cold water supply, and the tank will be filled
Inspect the heat exchanger every year. If it is dirty,             with water and emptied of air again.
take it out and wash it in warm water with soap and
rinse it with a hand shower.                                       When the tank has been filled with water, reinstall the front
                                                                   cover, and the voltage can be switched back on.

Fans                                                               7.3 Dismantling/Taking the System Out of
Inspect the fans for dirt in the fan wheels every year.            Service

Remove the front cover of the unit. Clean the fans with a          Do as follows:
brush, a bottle cleaner or a paint brush. Be careful not to        Disconnect the power supply, i.e. the electric cables.
remove the counterbalancing weights on the fan wheels as           Disconnect the condensation outlet and the power cables
this will lead to disequilibrium and cause a higher level of       to any reheater/preheater Disconnect the wires to the
noise and also wear the fans.                                      panel and dismantle the ducts. If the system needs to be
                                                                   taken out of service, dismantle the ducts to avoid con-
Supply air and extract air valves                                  densed water in the system and in the ducts. Close all
Clean the valves by drying with a dry cloth. Make sure that the    supply air and extract air valves.
valves do not turn around, causing a change in the air flow.

		21
8. TROUBLESHOOTING

8.1 High-Pressure Pressure Switch                              8.3 System Is Not in Operation

The high-pressure pressure switch protects the heat pump       The system has stopped.
from excessive pressure in the cooling circuit. In the event
of disturbances, the high-pressure pressure switch will        Check the following:
stop the compressor.
The system will restart when the high-pressure pressure        • Is the display illuminated?
switch is reset manually.                                      • Is the system disconnected via the clock program?
                                                               • Is the high-pressure pressure switch disengaged?
Before unscrewing the front cover, disconnect power to         • Is the cable between the control unit and the control panel
the system.
                                                                 attached?
Take off the front cover by removing the screws.               • Has the filter been changed? (“Change filter” alarm)
                                                               • Frost protection error.

                                                               Condensed water is leaking from the unit
                                                               Error possibility:
                                                               • The condensation outlet is blocked by dirt.
                                                               • The condensation outlet is not adequately protected

                                                                 against freezing at low outdoor temperatures.
                                                               • The drain trap is not installed correctly.

                                                               8.4 Air Faults

                                                               No supply air to the living rooms.

                                                               Error possibility:

                                                               • Blocked fresh air filter.
                                                               • The fresh air filter is blocked by dirt and leaves

                                                                 in the autumn or by snow and ice in the winter.
                                                               • Unit is defrosting.

To RESET, press the red button.                                No extract air from the wet rooms
                                                               Error possibility:
                                                               • Blocked extract air filter.

8.2 Immersion Heater's Safety Thermostat                       Cold supply air
                                                               Error possibility:
If sensor T7 of the immersion heater is defective, the         • The heat exchanger is blocked by dirt or ice.
safety thermostat ensures that the temperature of the          • Blocked extract air filter.
domestic hot water does not exceed 90 °C.                      • “Opening bypass” incorrectly set in the control unit or a
Before unscrewing the front cover, disconnect power to
the system.                                                      defective bypass.

Unscrew the cover plate in front of the immersion heater         If it is not one of the faults above, contact:
and reset the safety thermostat, as indicated in the picture.  • During the warranty period (0-2 years):

                                                                 the fitter that the unit was bought from.

                                                               • After the end of the warranty period (2 years ->):
                                                                 the fitter that the unit was bought from or Genvex cus-
                                                                 tomer centre (tel.: +45 7353 2700).
                                                                 Have the data from the rating plate readily available (silver

                                                                 plate on the unit).

To RESET,
press the white button

22
23
THE AIR WE BREATHE                                   All
                                                  Genvex
    As of 1 January 2025, Genvex has           systems are
    merged with our parent company              rated with
    METRO THERM into one company under         energy label
    the name METRO THERM A/S.
                                                 A
    With the merger, both physical addres-
    ses will be retained: The head office and
    production for METRO THERM will
    remain in Helsinge, while administration
    and production for Genvex and KVM-
    Conheat will remain at the Haderslev
    address as a subdivision.

    The three strong brands – METRO
    THERM, Genvex and KVM-Conheat –
    remain unchanged and will continue to
    be treated as independent brands under
    METRO THERM A/S.

 Genvex – the original Danish ventilation system                          08:126-2511

 Genvex is a true Danish original. We started producing ventilation
 systems in 1978 and are still the front runners when it comes to
 development and production of the most innovative and durable
 ventilation systems on the market.

 Our units are installed in thousands of homes, providing clean, fresh
 air free from pollen, dust and harmful particles. They help lots of
 families with maintaining a healthy and comfortable indoor climate
 and prolong the longevity of the house itself. With very high heat
 recovery rates, a Genvex system lets you recover and reuse up to
 95 % of the heat inside your home. As a result, our units provide a
 strong contribution to energy savings in both in family homes and in
 society as a whole.

Please visit www.genvex.com to see a list of our distributors

METRO THERM A/S • Tel.: +45 48 77 00 00 • sos@genvex.dk • www.genvex.com
