Genvex OPTIMA 251 User manual

USER
MANUAL
OPTIMA 251 - PCB ES960C
ECO 190, ECO 375

2
TABLE OF CONTENT
1. Mounting Instructions.......................................................................................................................................................3
2. Control panel.........................................................................................................................................................................4
3. Installation.............................................................................................................................................................................4
4. Start-up ..................................................................................................................................................................................4
5. Operating ...............................................................................................................................................................................5
5.1 Operating and changing data in the operating menu ...............................................................................5
5.2 Main menu ...............................................................................................................................................................6
5.3 Date and time.........................................................................................................................................................6
5.4 Calendar ...................................................................................................................................................................6
5.5 User menu................................................................................................................................................................7
5.6 Display menu ..........................................................................................................................................................8
5.7 Info menu ..............................................................................................................................................................10
5.8 Service menu .......................................................................................................................................................11
5.9 Schedule for week program ...........................................................................................................................12
5.10 Schedule for set points.................................................................................................................................15
6. Function...............................................................................................................................................................................16
6.1 Controlling Optima 251...................................................................................................................................16
6.2 Extra capacity.....................................................................................................................................................16
6.3 Operating reliability..........................................................................................................................................16
7. Maintenance.......................................................................................................................................................................17
7.1 Unit.........................................................................................................................................................................17
7.2 Alarms....................................................................................................................................................................17
7.3 Dismantling/taking the system out of service........................................................................................17
8. Troubleshooting................................................................................................................................................................18
8.1 Safety thermostat in electrical heater (optional equipment)...........................................................18
8.2 The system is not running ...............................................................................................................................18
8.3 Air faults................................................................................................................................................................18

INSTALLATION
1.1 Installation of the control panel
The control panel is designed to be mounted onto a flat
wall.
1.2 Mounting
Find the location on the wall where you will fix the control
panel and mark the screw-hole positions. A min. of four
screws must be used, the two bottommost and the two
topmost.
Mandatory Screw Mandatory Screw
Mandatory Screw Mandatory Screw
Screw
Screw
Hold the wall frame against the wall and mark the screw-
hole positions. Drilling of holes, hole size and the
corresponding screws for fixing the panel 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 corner of the display
must touch the wall to keep the display stable.
A
Support
Point
Support
Point
Support
Point
Support
Point
Underneath the control panel there is an access for the:
A: Terminal block. Connection to main circuit board
A low-current cable 4 x 0.25 mm2must be attached between
the unit and the control panel. 50 m is the maximum cable
length. The voltage drop for cable lengths over 50 m is too
high and can result in unreliable operation.
How to mount the wall fixture:
1. First screw the fixture securely onto the flat wall and
pass the cable up from below.
2. Connect the low-current cable to the terminal block.
Check that the cable is connected to the same numbers
at both ends. (Between the control panel and the main
circuit board in the unit.)
3. Clip the control panel to the wall fixture by guiding it
down from above, slightly slanting out at the bottom.
Finish by pressing in at the bottom so that it sits flat
against the wall. For demounting: pull the control panel a
little out at the bottom and lift up.
Pos. Description
1 Panel housing
2 Front of panel
3 Pressure plate for display
4 Wall fixture
5 Glass for the display
3

The control panel must be mounted on an interior wall that
is centrally located in the home.
Since the control panel at the same time functions as a
room thermostat, it is important to observe the following:
• 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
sensor so that the control panel will not regulate the light
intensity as intended.
On the front of the control panel in the ring there are 7
keys that are used to operate the panel. 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. Simply by moving your hand past the control
panel you can bring up the menu for daily operating
options. (This function can be turned off:
See under Main menu/Display/Menu item 5).
The following are located 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 that make the control panel compatible with
older versions. The SD card also contains all the langu-
ages, menus, help texts, symbols and collected data logs.
During the start-up procedure, the current versions are
installed in the control panel so that the control 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 read the data logs,
the Genvex data logger program must be installed.
3. INSTALLATION
Please see the installation guide.
The first time the system is started, the control panel
display will show: “Choose language”.
Click “Next” to switch between available languages. Press
“Enter” when the 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 251 UK
The display will then change to:
• The Genvex logo
• Optima 251 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 adjusted with the most
optimal air flows and the operational desires and demands
for the dwelling in question, e.g. weekly operation,
temperatures etc. to achieve the most effective utilisation
and operation of the system.
2. CONTROL PANEL 4. START-UP
4

Optima 251
The Optima 251 display is preprogrammed with factory
settings which is uploaded to the ventilation unit PCB
when starting up the ventilation unit for the first time.
The factory setting is only a basic setting that should be
adapted to the operating desires and demands for the
dwelling in question to achieve the most effective
utilisation and operation of the system.
5.1 Operating and changing data in the
operating menu
Normally the symbols for daily operating options are
displayed and the following keys can be seen.
K1
K2
K4
K3 K5
K6
K7
K1 - Speed
Use this function to set the fan speed to levels 0-1-2-3-4.
Use the key next to the “Speed” symbol to change between
the 4 speeds. The system can also be stopped by holding
down the key for 3-4 seconds on condition that item 28 of
the Service menu is set to ON.
K2 - Forced operation (Party mode)
Use this function/key to set the timer to party mode from
0 to 9 hours. If the number of hours is set to 0, speeds 3
and 4 will run until the speed is changed manually. If the
the number of hours is set between 1 and 9 hours, speeds
3 and 4 will automatically reconnect to speed 2 after the
number of hours configured.
K3 - Reheating
Use this function to switch the reheater on and off. On the
key next to the symbol “reheating” you can change between
“+” and “÷”. If the symbol is set to “+” and the system is
equipped with a reheater the heater will commence as
required. If the symbol is set to “÷”, the heater will not
commence, even if required.K4 - Main menu
Use this function to enter the main menu and access the
sub-items Date and time, Calendar, User menu, Display,
Info operation and Service menu.
K5 - Filter
Use this function to reset the filter alarm. The key next to
the “Filter” symbol resets the alarm for filter change. To
reset the filter alarm, change the filters and hold down the
key with the “Filter” symbol until the exclamation mark in
the symbol disappears.
K6 - Information
Use this function to get an overview of the current
operating condition, e.g. temperatures, fan settings, relay
status/function ON/OFF, alarms, timers etc.
Use the key next to the symbol “Info” to read the operating
condition of the unit. More information can be found in the
main menu section under the item Info operation.
K7 - Temperature
Use this function to set the desired temperature if the
system is equipped with an reheater and/or a bypass
damper. Press the key next to the “Temperature” symbol
to enter the desired temperature between 10 and 30 °C.
The current temperature will be displayed at the centre of
the screen.
Press the key K4 to enter the main menu and sub-menus
and the following keys change function:
K3 changes to “Arrow down ” and when changing the
setting to “÷”.
K4 changes to “Enter”. Press “Enter” to proceed through
the menus and sub-menus.
K5 changes to “Arrow up” and when changing the setting
to “+”.
K6 changes to “Exit”. Press “Exit” to return to the
previous screen.
K7 changes to “Help”. Press “Help” to see a short guide
to 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”.
5. OPERATING
5

5.2 Main menu
There is a “Book” symbol at the bottom centre of the
screen with the daily operating options. Press this key to
enter the main menu.
Date and time (item 4.3)
Calendar (item 4.4)
User menu (item 4.5)
Display (item 4.6)
Info operation (item 4.7)
Service menu (item 4.8)
“Arrow down” or “Arrow up” will change the symbol to a
horizontal arrow that shows the current location.
Press “Enter” to access the sub-items of the current menu.
Press “Arrow down” or “Arrow up” again to select the
required sub-menu item. When the horizontal arrow is
next to a sub-menu item, the 2 lines will change place, the
font sizes will change and the text “Set” will be added.
Pressing ”Enter” next to the selected sub-menu item will
change the background of the item to grey. Use the ”+” and
”÷” keys to change the current value. Press “Enter” again to
save the change.
If no changes are required, press “Exit” to go back out of
the menus. Press “Help” to see a short guide to the menu
item. Press one of the keys to exit the help program.
After a short period of non-activity, the control will
automatically exit the programs.
5.3 Date and time
Use this function to set the date and time.
01 - Hours
Enter the current hour here.
When changing between summer and winter time you have
to set the time one hour forward or back manually.
02 - Minutes
Enter the current minute here.
03 - Weekday
Enter the current weekday here.
04 - Date
Enter the current date here.
05 - Month
Enter the current month here.
06 - Year
Enter the current year here.
5.4 Calendar
Use this function to configure the setting of each day of
the week. Each day can be configured to run with different
fan speeds as required. You can copy the configuration
from one day to another. You can choose ON or OFF here,
i.e. if for a period of time there is nobody home, the daily
settings can be turned off and the system will run
according to a manual setting, e.g. level 1.
01 - Calendar
Choose between controlling the system manually or
controlling the speed (air exchange) and temperature
automatically according to a fixed day program. If the
menu item is set to OFF, the system will be controlled
manually according to the speed and temperature
selected.
If the menu item is set to ON, the system will be controlled
according to the day programs entered in the menu items
02 to 08.
Setting option: ON/OFF.
Monday 1
Tuesday 2
Wednesday 3
Thursday 4
Friday 5
Saturday 6
Sunday 7
Weekday
January 1
February 2
March 3
April 4
May 5
June 6
July 7
August 8
September 9
October 10
November 11
December 12
Month
6

02 - Monday
Up to 10 switching times can be entered for one day. The
times can be entered in random order. Enter the hours in
the first column, the minutes in the second and the speed
in the third column. Use the fourth column to enter the
temperature difference by which the temperature should
be lowered.
Example: If the temperature is set to 21 °C and you enter –
2.0 °C, the system will aim at 19 °C.
If the speed has been changed manually on the key under
daily operation, the program will return to the day program
when the next switching time is passed.
Examples of a day program:
01 07:30 H3 -0,0
02 09:15 H1 -1,0
03 17:00 H3 -0,0
04 18:00 H2 -0,0
05 23:30 H2 -2,0
It is not necessary to use all switching times. If the line is
marked by 0, it will be skipped by the control.
03 to 08
These days can be filled in individually in the same way as
under item 02.
09 - Copy day
Use this menu item to copy one day to another, where the
same switching times, speeds and temperature lowering
are required.
For example: From Thursday to Tuesday.
5.5 User menu
01 - Temperature
Set the desired temperature between 10 and 30 °C.
In item 19 of the Service menu you can choose between
supply air regulation, room regulation or extract air
regulation. (The sensor is mounted in the control panel).
Setting option: between 10 and 30 °C.
02 - Preheating
If a preheater is fitted to the fresh air duct the set point
must be configured to ON. Enter the desired preheating
temperature in item 20 of the Service menu. If instead a
refrigerant device is installed in the supply air duct the set
point must be configured to OFF. (It is not possible to
control a preheater and a refrigerant device at the same
time).
If both types of optional equipment are installed, the set
point must be configured manually in spring and autumn. If
none of the help functions in item 27 of the Service menu
are used, the help function 4 can be used to control the
additional cooling.
Setting option: ON/OFF.
03 - Reheating
If a reheater is fitted to the system it is optional if the
reheater should operate. If the set point is configured to
OFF the heater will not operate, even if required. Is the set
point configured to ON the reheater will engage as
required. It regulates according to the temperature set in
item 1 of the User menu.
Setting option: ON/OFF.
04 - Timer levels 3 and 4
At speeds 3 and 4, the system will automatically reconnect
to speed 2 after the number of hours set in item 17 of the
Service menu by configuring the set point to ON. If 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 can also
be operated directly on the key next to the symbol for
“Party mode” on the screen for daily operating options.
Setting option: ON/OFF.
05 - Change filter
A filter timer is built-in counting how long the system has
been running since the last change of filter. The set point
can be set between 1-12, which corresponds to 12 months.
It is recommended that the set point should initially be set
to 3, corresponding to 3 months (by entering 0 - the filter
timer will be off and will not give a filterwarning).
If the filters are too dirty after the period configured, set
the set point to a lower number. If it is not necessary to
change the filters after the configured period, the set
point can be set to a larger number.
When the timer reaches the configured value for the
change of filter, the alarm “Change filter” will flash at the
top of the screen saver.
When the filters have been changed, return to the screen
with daily operating options and hold down the key for the
“Filter” symbol until the exclamation mark disappears and
the system returns to normal operation.
Setting option: between 1 and 12 months. setpoint = 0 will
disable the filter timer (Be carefull when using this setting
– Genvex does not take any responsibility due to
ventilation unit errors based on clogged filter)
06 - Humidity control
Here the humidity control is turned on, which must be set
to ON in order to be active.
Setting option: ON/OFF.
7

5.6 Display menu
The menu item with the “Display” symbol.
Use this function to configure the following sub-menu
items:
01 - Language
Choose between several different languages in the
display.
02 - Program info
This menu shows which Optima is fitted on the system and
its version number.
Example: Optima 251 UK D: 3.1 C: 1.0
D represents the version number of the control panel.
C represents the version number of the main board.
03 - Screen saver
The following settings can be selected here:
0: Screen saver off (daily operating options are displayed)
1: Screen saver off, but with light dimming
2: Room temperature + light dimming
3: Clock + light dimming
4: Clock and room temperature + light dimming
5: Black screen + light dimming
Setting option: between 0 and 5.
04 - Pause time
Use this to set the period from no operation of the
symbols on the screen for daily operation until the screen
automatically returns to the screen saver. From daily menu
to screen saver variable from 1 to 10 minutes. The other
automatic return connections cannot be adjusted. If no key
has been pressed within the time intervals indicated
below, it will automatically return to the previous screen:
• Change in menu item back to menu item = 30 seconds
• From menu item to main menu = 2 minutes
• From menu item to daily menu = 2 minutes
Setting option: between 1 and 10 minutes.
05 - Auto wake-up
It is possible to deactivate the “Auto wake-up” function,
where you can change from the screen saver to the screen
with the symbols for the daily operating options by moving
your hand past the control panel.
If the function is set to OFF, press any key to display the
daily operating options.
Setting option: between 0 and 4.
”” OFF
”” Max sensitive
”” Level 2
”” Level 3
”” Least sensitive
06 - Auto brightness
In the display there is a movement sensor.
Setting option: ON/OFF.
07 - Brightness day
Use this to enter the maximum brightness level for the
control panel when the room is fully lit.
Setting option: between 0 and 100 %.
08 - Brightness night
Use this to enter the minimum brightness level for the
control panel when the room is in complete darkness.
Setting option: between 0 and 100 %.
09 - Brightness day screen saver
Use this to enter the maximum brightness level for the
screen saver when the room is fully lit.
Setting option: between 0 and 100 %.
10 - Brightness night screen saver
Use this to enter the minimum brightness level for the
screensaver when the room is in complete darkness.
Setting option: between 0 and 100 %.
11 - Reset to factory settings
If the set points are configured so that the system does
not function as expected and the cause cannot be estab-
lished, there are 2 different options to reset the menu
items to the factory settings.
• Press 1 to change all menu items to the factory settings
except for the menu items for Speed (Level), Filter
timer, Calendar and Defrost temperatures.
• Press 2 to change all menu items to the factory
settings.
Note: Before performing a reset, ensure that the currently
entered values are noted in the “Schedule for set points”.
Setting option: between 0 and 2.
8

12 - Safety menu
It is possible to prevent access to selected main menu
items so that they can only be changed with a password,
which is a 4-digit figure. The first time, press 4 times 0 and
then “Enter”. Items 13 to 18 will open. Select the password
in item 18, which will also be the password to access the
menu items 13 to 18 in future.
13 - Date and time
If this item is set to ON, it will not be possible to enter the
menu for Date and time without using the selected
password in item 18.
Setting option: ON/OFF.
14 - Calendar
If this item is set to ON, it will not be possible to enter the
menu for Calendar without using the selected password in
item 18.
Setting option: ON/OFF.
15 - User menu
If this item is set to ON, it will not be possible to enter the
User menu without using the selected password in item
18.
Setting option: ON/OFF.
16 - Display
If this item is set to ON, it will not be possible to enter the
menu for Display without using the selected password in
item 18.
Setting option: ON/OFF.
17 - Service menu
If this item is set to ON, it will not be possible to enter the
Service menu without using the selected password in item
18.
Setting option: ON/OFF.
18 - Password
Enter the selected password here and use this also in item
12 to enter items 13 to 18. If you forget your password,
contact Genvex Service department for assistance. To
change the password, enter a new password in this item
and press “Enter”. The password has now been changed.
5.7 Info operation
The Info operation menu provides an overview of the
current operating status of the system. If you want to see
the operating status of the system over a period of ope-
ration, connect the control panel to a computer and use
the Optima data logger program. The system monitors the
operating status every minute and stores the data for up
to one year on the SD card.
Current temperature
Press “Enter” next to the info operation menu. The first
screen displayed shows the current temperatures.
T Supply air
T Room
T Fresh air
T Exhaust air
T Extract air
T Frost protection
T Extra sensor
Current fan speed
Press “Arrow down” to display the current percentage fan
speeds and the opening of the bypass damper and of the
water valve.
Supply air in %
Extract air in%
Bypass damper in %
Water valve in %
Bypass on/off
Current setting of operation relays
Press “Arrow down” again to display the current status of
the operation relays.
R Reheating
R Preheating
R8 System in operation
R9 Help relay 9
Current list of alarms
Press “Arrow down” again to display the current alarms. An
alarm it is activated if ON appears beside it. At ON there is
an alarm, which can also be seen on the screen saver and
the display for daily operating options. At the top it says
alarm. The Info operation menu shows the type of alarm.
When the timer for changing filter reaches the set value,
the alarm “Change filter” will flash at the top of the screen
saver.
9

10
The alarm will read OFF when the error has been corrected
or the filter is changed and reset.
Alarm Status Error at ”ON”
Control
stopped
ON/
OFF
Filter not changed after  days/
Frost protection error/The system
is equipped with an external switch
between terminals  and .
“Alarm” will be displayed when
these are short-circuited and the
system has stopped.
Change
filter
ON/
OFF
The filters should be changed.
Frost
protection
ON/
OFF
The temperature of the water after
heater is too low (frost danger).
Com error ON/
OFF
The control panel cannot
communicate with the main board
between display and printed circuit
board).
Hour counters (2 pages)
Press “Arrow down” again to display the hour counters,
which count from the day the system is put into operation.
The figures shown should be multiplied by 10. This shows
how many hours the system has been running, how many
hours the system has run at the various speeds and how
many hours the relays have been connected (ON).
Total tid
Level 0
Level 1
Level 2
Level 3
Level 4
Relay  Reheating
Relay  Preheating
Relay  System in operation
Relay  Help function
Press “Exit” to return to the main menu.
5.8 Service menu
Use this function to configure the following sub-menu
items.
10 - Level 1 Supply air
Level 1, which is the lowest speed, is usually used when
there is nobody home. Both fans can be configured
independently of each other for all levels so that the air
flow in the supply air and in the extract air is equal, which
provides optimal operation.
The adjustment of the system must be performed with
specialised air measurement equipment and can be
performed without the use of the main regulating damper.
It is not recommended to configure the air flows without
expert advice. Incorrect configuration can lead to major
energy consumption or unpleasant indoor climate.
Setting option: between 0 and 100 %.
11 - Level 2 Supply air
Level 2 is the recommended speed of the system in order
to provide the optimal indoor climate and it should be
adjusted to the ventilation requirement of the dwelling.
Setting option: between 0 and 100 %.
12 - Levels 3 and 4 Supply air
Level 3 is the highest speed that can be configured. It is
used e.g. if there are many guests or there is a lot of
activity in the kitchen.
Setting option of level 3: between 0 and 100 %.
Factory setting of level 3: 75 %.
Level 4 is used mainly in summer to lower the indoor
temperature. Remember that a higher air exchange rate
increases the energy consumption.
Setting option of level 4: cannot be configured.
13 - Level 1 Extract air
The fan speed is adjusted until the same air flow is
achieved as the supply air on level 1.
Setting option: between 0 and 100 %.
14 - Level 2 Extract air
The fan speed is adjusted until the same air flow is
achieved as the supply air on level 2.
Setting option: between 0 and 100 %.
15 - Levels 3 and 4 Extract air
The air flow of level 3 is adjusted to the same air flow as
the supply air on levels 3 and 4 (item 12).
Setting option of level 3: between 0 and 100 %.
Factory setting of level 3: 75 %.
Setting option of level 4: cannot be configured.
16 - Fine tuning (T2)
It is possible to fine tune the room sensor of the control
panel so the correct current room temperature is
displayed.
Setting option: between -5 and 0 °C.

17 - Timer levels 3 and 4
If automatic reconnection is used for speeds 3 or 4, you
can enter how many hours the system should run on level 3
or 4 before it automatically returns to level 2. The set
point can be configured between 1 and 9 hours.
Setting option: between 1 and 9 hours.
18 - Filter/stop
To ensure that the filters are changed when the alarm
“Change Filter” flashes on the screen of the control panel,
the set point can be configured to ON. The system will then
stop automatically after 14 days if the filters have not
been changed.
If this precaution is not required, the set point can be
configured to OFF and the system will continue to operate.
Setting option: ON/OFF.
19 - Method of regulation
There are 3 options:
0. Room regulation (T2 sensor)
1. Supply air regulation (T1 sensor)
2. Extract air regulation (T7 sensor)
If the system is used in a dwelling, supply air regulation is
the normal choice. The set point is configured to 1.
For room regulation, configure the set point to 0.
For extract air regulation, configure the set point to 2.
Setting option: between 0 and 2.
20 - Preheating
If preheating is set to ON in item 2 of the User menu, the
set point must be configured to the fresh air temperature,
at which the preheating should connect.
Setting option: between -15 and 0 °C.
21 - Bypass open
Here you set the temperature at which the bypass should
be 100 % open. You set a temperature differential which
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
°C, this menu item should be set to 3 °C.
The bypass will open, provided that:
1. The exhaust temperature is higher than the outdoor
air temperature.
2. The outdoor air temperature is above the set tempera-
ture in the Service Menu Item 29.
Units with modulating bypass: If the temperature rises 0.5
°C above the temperature set in User Menu item 1, the
bypass damper will begin to open. The bypass is 100 %
open when the temperature reaches the set point in the
User Menu Item 1 + the temperature differential set in this
menu item.
To get a smooth opening of the bypass, the temperature at
which the bypass is fully open should be set appr. 3 ºC
above the set temperature in Use Menu item 1.
Units with on/off bypass (e.g. ECO190 / ECO 375): The
bypass opens when the temperature reaches the set point
in the User Menu Item 1 + the temperature differential set
in this menu item.
Setting option: between 1 and 10 °C.
22 - Regulation water
If a water reheater with a motor-operated valve is
installed in the system it may be necessary to adjust the
regulation time.
The less regulation time, the faster the motor-operated
valve will regulate.
Setting option: between 1 and 250 seconds.
23 - Regulation electricity
If an electrical preheater or an electrical reheater is
installed, it may be necessary to adjust the regulation
time.
Setting option: between 1 and 300 minutes.
24 - Frost reduction
To avoid icing of the counter current heat exchanger, the
supply air flow can be reduced gradually, when the exhaust
air temperature after the counter current heat exchanger
has fallen below the set temperature. This function
gradually reduces the supply air flow, until the set value
has been reached.
Caution: May cause under pressure in the house!
Setting option: between 0 and 10 °C. The function is
disabled if set to 0 °C.
25 - Frost protection
If a water reheater with motor-operated valve is instal-led
in the system, a frost protection sensor must be fitted to
the water reheater and the set point configured to ON.
If no frost protection sensor is installed, the set point
must be configured to OFF.
Setting option: ON/OFF.
26 - Frost protection temperature
If frost protection in item 25 is set to ON, the frost
protection temperature must be configured to the
temperature where the system should stop and the motor-
operated valve open completely for the flow of hot water.
Setting option: between 0 and 10 °C.
11

27 - Help function
This function can be used for the following:
Setpoint Function
0 The relay is off.
1 The relay is on when the system is running.
This can e.g. be used to open and close the
fresh air damper and the exhaust air damper.
2 The relay is on when extra heat is required or
when the circulating pump should run when
heating with water reheating is required.
3 The relay is on when the alarm “Change filter”
is active. This can be used to activate an
external alarm.
4 The relay is on when extra cooling is required.
This function is used if a preheater is also fit-
ted to the system.
The control can handle an earth heat exchang-
er by a damper.
The relay will be on for one of the following
two conditions:
• The outdoor temperature, sensor T9, is
lower than the value configured in item
26 (frost protection temperature, typi-
cally set at 5 °C).
• The outdoor temperature, sensor T9, is
more than 1° above the temperature
configured in item 1 and 1 ° above the
current room temperature.
Setting option: between 0 and 5.
28 - System stop
Here you choose if it should be possible to stop the
system by pressing the key for speed (K1) in the operating
menu for 3-4 seconds. If the set point is OFF, the system
cannot be turned off.
Setting option: ON/OFF
29 - Turn off bypass
To prevent the bypass damper from opening at low fresh
air temperatures and blow cold, not heated air into the
dwelling, use this function to configure the lowest fresh air
temperature, at which the damper must be closed. The
value is an expression of the greatest difference that may
exist between the temperature configured in item 1 and
the lowest fresh air temperature.
Setting option: between 0 and 20 °C. If 0°C is selected, the
function is turned fully off.
30 - Modbus Mode
See separate description for MODBUS.
Setting option: 0-2.
0 = Modbus OFF
1 = 9600 Baud
2 = 19200 Baud
31 - Modbus Adress
See separate description for MODBUS.
Setting option: 1-247.
32 - Humidity max. temperature
Setting the end point for outside temperature-
compensation (T3), see the X-axis on the graph.
Setting option: 5-25 °C.
33 - Humidity max. value
Setting the end point for outside temperature
compensation, see the Y-axis on the graph (desired max.
humidity value).
Setting option: 35-85 %.
34 - Humidity fan speed
Setting of how much the fan speed may differ in relation
to the desired fan speed. See menu points 11, 12, 14 and
15.
Setting option: 5-30 %.
35 - Humidity regulating frequency
Setting of desired frequency for how often the fan speed
may be changed.
The function is defined as 1 % per unit of time.
Setting option: 1-60 min.
Sketch for humidity regulation
Desired RH set-point, see the graph below.
Variable fan speed on fresh air, see the graph below.
Extract air Fresh air
Supply air Exhaust air
Sensor
location
12

= Limits
= Factory setting
= Examples
Example
1
At a fresh air temperature of 10°C the RH-value is 55 %.
Example 2
At a fresh air temperature of 20°C the RH-value is 60 %.
100%
95
90
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
S. 33
Fresh air temp. °C
RH
S. 32
Pre-
setting
Ex. 1 Ex. 2
Set point 34
Setting for how much the fan speed may differ in
relation to the desired fan speed.
Example:
Set point 34 = ± 15%
With a desired fan speed of 3, the fan speed will be able
to fluctuate ± 15 %. Since fan speed 3 is set at 75% in
service menu 12 and 15, the fan speed must be max.
90% and min. 60%.
The same applies to fan speed 2. Since fan speed 2 is
set at 50% in service menu 11 and 13, the fan speed
must be max. 65% and min. 35%.
Regulation of the fan speed takes place ±1% for every
10 min.
Setting option: see set point 35.
Level
4 = 100%
Level 3
= 75%
Level 2
= 50%
Level 1 = 30%
35%
65%
90%
60%
±15%
±15%
S.34
S.34
Outside temperature compensation curve
Fan speed
13

36 - Not applicable
37 - Preheat PI P
P-band for the PI controller for the electrical modulating
preheater.
The P-band controls the amplification of the controller
following a deviation from the setpoint (speeder)
38 - Preheat PI I
I-band for the PI controller for the electrical modulating
preheater.
The function controls how quickly the controller adapts to
a deviation of the setpoint (brake).
39 - Preheat Reg
Preheat Cycle the function works the following way
e.g. necessary output 50% and cycle =60 sec means
controller will switch on preheater for 30 sec and off for
30 sec.
Note: please refer to your country specifik regulations on
limitations when adjusting this function.
The modulating preheater function refers to the value
adjusted in setpoint no. 20.
The preheater will try to maintain a steady fresh air
temperature according to this setpoint.
When using the modulating preheater - the exsting fresh
air temperature sensor (T3) built into the ventilation unit
can be used as reference. No extra temperatur sensor is
required.
40 - Reheat offset
Offset for reheater with reference to the setpoint
requested temp on display (user menu 01)
e.g. requested temp = 20 °C
offset value=2 reheater aims for 18 °C supply temperature
41 - Reheat PI P
P-band for the PI controller for the electrical modulating
reheater.
The P-band controls the amplification of the controller
following a deviation from the setpoint (speeder).
42 - Reheat PI I
I-band for the PI controller for the electrical modulating
reheater.
The function controls how quickly the controller adapts to
a deviation of the setpoint (brake).
43 - Reheat Reg
Reheat Cycle the function works the following way
e.g. necessary output 50% and cycle = 60 sec means
controller will switch on preheater for 30 sec and off for
30 sec.
Note: please refer to your country specifik regulations on
limitations when adjusting this function.
The modulating reheater function refers to the value
adjusted in setpoint no. 40.
The reheater will try to maintain a steady supply air
temperature according to this setpoint.
When using the modulating reheater - it will be necessary
to replace the inlet air temperature sensor (T1) in the
ventilation unit with a new temperature sensor installed
upstream of the reheater.
14

15
5.9 Schedule for week program
Red. T2 = Reduced room temperature
(Night set-back)
Hours Minutes Speed Red. T2
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
Monday
Hours Minutes Speed Red. T2
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
Thursday
Hours Minutes Speed Red. T2
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
Sunday
Hours Minutes Speed Red. T2
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
Tuesday
Hours Minutes Speed Red. T2
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
Friday
Hours Minutes Speed Red. T2
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
Wednesday
Hours Minutes Speed Red. T2
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
Saturday

5.10 Schedule for set points
Item Headline Factory setting Configuration area Date Date Date Date
(5.5) 01 Temperature 21 °C 10 - 30 °C
02 Preheating OFF ON / OFF
03 Reheating OFF ON / OFF
04 Timer levels 3 and 4 OFF ON / OFF
05 Change filter 3 months 1 - 12 months
06 Humidity control OFF ON / OFF
(5.8) 10 Level 1 Supply air 30 % 0 - 100 %
11 Level 2 Supply air 50 % 0 - 100 %
12 Level 3 and 4 Supply air 75 % 0 - 100 %
13 Level 1 Extract air 30 % 0 - 100 %
14 Level 2 Extract air 50 % 0 - 100 %
15 Level 3 and 4 Extract air 75 % 0 - 100 %
16 Fine tuning (T2) ÷ 3°C ÷ 5 - 0 °C
17 Timer level 3 and 4 3 hours 1 - 9 hours
18 Filter/stop OFF ON / OFF
19 Method of regulation 2 0 - 2
20 Preheating ÷ 3 °C ÷ 15 - 0 °C
21 By pass open 3 °C 1 – 10 °C
22 Regulation water 20 sec. 1 - 250 sec.
23 Regulation electricity 3 min. 1 - 30 min.
24 Frost reduction 0 °C 0 – 10 °C
25 Frost protection OFF ON / OFF
26 Frost protection temperature 5 °C 0 - 10 °C
27 Help functions 0 0 - 5
28 System stop OFF ON / OFF
29 Turn off bypass 4 °C 0 - 20 °C
30 Modbus Mode 0 0 - 2
31 Modbus Address 1 1 - 247
32 Humidity max. temperature 15 °C 5 - 25 °C
33 Humidity max. value 60 % 35 - 85 %
34 Humidity fan speed 15 % 5 - 30 %
35 Humidity regulating frequency 10 mIn. 1 - 60 min.
36 Not applicable
37 Preheat PI P 5 1-255
38 Preheat PI I 200 1-255
39 Preheat Reg 40 10-120
40 Reheat offset 2 0-20
41 Reheat PI P 5 1-255
42 Reheat PI I 200 1-255
43 Reheat Reg 40 10-120
16

6.1 Controlling Optima 251
Regulation of room temperature
There are 3 methods of regulation – see service menu item
19. If the supply air regulation has been selected, the
controller will blow in air with the temperature set,
provided that a reheater is fitted to the system. The
supply air temperature is regulated by the supply air
sensor T1.
It is recommended to configure the supply air temperature
2-3 °C below the room temperature.
Relay R8
When the system is running at levels 1, 2, 3 or 4, the relay
will be turned on. This function can be used to e.g. control
the fresh air damper or the exhaust air damper.
6.2 Extra capacity
Water reheating
For systems with water reheaters the motor-operated
reheater will begin to regulate (PI regulation) when the
temperature has fallen 1 °C below the temperature set.
Electrical reheating on / off version
For systems with electrical reheaters the reheater will
connect when the temperature has fallen 1 °C below the
temperature set. If the regulation time is set to e.g. 3
minutes, the temperature sensor T1 will measure if the
temperature is now above or below the temperature set
after 3 minutes. If the temperature is still below the
temperature set, the reheating will keep running. When the
temperature reaches the value set, the electrical reheater
will disconnect.
Electrical reheater (modulating)
For systems with the modulating electrical reheater.
The electrical reheater will automatically adapt to changes
in airflow and temperatures - maintining a constant
temperature according to the requested setpoint.
The controller will be adjusting the electrical output of the
reheater automatically.
Extra cooling
If an extra cooling device is fitted to the system, this will
turn on when the bypass motor is open completely and
turn off again when the bypass motor begins to turn off
again.
Systems with an electrical preheater will regulate in the
same way as an electrical reheater.
6.3 Operating reliability
Safety thermostat
If an error occurs on an electrical heater, the safety
thermostat will disconnect.
The heater is equipped with a fire thermostat that
automatically cuts off the power supply, if the
temperature exceeds 80 °C. If the temperature decreases,
the heater automatically re-engages.
As an additional security there is a built-in thermal cut-
out, which disengages if the temperature exceeds 110 °C.
Re-engaging must be done manually.
Does not apply to PTC electrical heaters.
Remember to disconnect the power to the system before
performing any service on the ventilation system.
6. FUNCTION
17

18
Follow the following instructions to achieve optimal
performance:
Before opening the unit, turn off the power/
pull out the plug and wait until the fans have
stopped completely.
A couple of days after the primary installation, check that
the condensation outlet is working.
Environmental requirements
When repairing or dismantling the unit, statutory
environmental regulations must be observed regarding
recycling and destruction of various materials.
7.1 Unit
Filters
When the alarm “Change filter” flashes in the control panel
display, the filters must be changed. Stop the system by
the circuit breaker of the unit or by the circuit breaker on
the terminal board. Open the front cover/filter drawers
and remove the filters. After having changed the filters,
reset the filter timer. The time interval for cleaning/
changing the filters can be adjusted in the operating menu.
There is a danger of cuts from sharp discs.
The discs must not be damaged.
Vacuum cleaning or using pressurised air on
the filters is not recommended.
Filter performance may be impaired.
G4 = Standard filter
F5 = Fine filter
F7 = Pollen filter
Condensation drain:
When changing the filter in August/September before
the outside temperature falls to 5 °C, check that the
condensation drain is not blocked with dirt and make sure
that there is water in the water trap. Pour 1 litre of water
into the condensation tray and make sure it runs off freely.
If the condensation drain does not work, this could lead to
water damage in the home.
Heat exchanger:
Inspect the heat exchanger every year. If it is dirty, remove
it and:
- Alu-exchanger: Wash in lukewarm soapy water and rinse
using a hand shower if necessary.
- Plastic exchanger: No cleaning with solvents - use only
clean water carefully only careful dust removal from air
intake surfaces
with a household vacuum cleaner.
Fans:
Inspect the two fan wheels for dirt each year. If they are
dirty, they can be washed using a brush, bottle cleaner, etc.
Supply air and extract air valves:
Clean the valves by wiping with a dry cloth. Be careful that
the valves do not turn, so that the air volume changes.
7.2 Alarms
Filter timer
The control has a filter timer to guarantee that the filter is
changed and that optimal operation is established. When
the timer reaches the set value, “Chg. filter” will flash in
the display until the filters have been changed.
When the filters have been changed, the button for the
filter symbol must be held down until ”Alarm!”, “Chg. Filter”
and the exclamation mark disappears and the unit reverts
to normal operation.
Com error
This error appears when there is no communication
between the display and control. Check that the wiring is
correct on terminals 21 to 24.
21 Signal
22 Signal
23 10 Volt
24 0 Volt
Frost protection error
This error message will be displayed if a water reheater is
fitted to the system and the temperature of the water
reheater is too low, causing a danger of frost burst.
The control will stop the system and open the motor-
operated valve to keep the heater warm.
7.3 Dismantling/taking the system out of
service
The following must be done:
The power supply, i.e. the power cables, must be
disconnected. Disconnect the condensation outlet and
power cables for any reheater/preheater. Disconnect
cables for the control panel and dismantle ducts.
If the system should to be taken out of service, the ducts
must be dismantled to avoid condensed water in the
system and in the ducts. Close all supply air and extract air
valves.
7. MAINTENANCE

19
8.1 Safety thermostat in electrical heater
(optional equipment)
If an error occurs on an electrical heater, the safety
thermostat will disconnect.
The heater is equipped with a fire thermostat that
automatically cuts off the power supply, if the
temperature exceeds 80 °C. If the temperature decreases,
the heater automatically re-engages.
As an additional security there is a built-in thermal cut-
out, which disengages if the temperature exceeds 110 °C.
Re-engaging must be done manually.
Does not apply to PTC electrical heaters.
8.2 The system is not running
Unit stopped
Possible error:
• Fuse in main board has blown, no power to unit.
• One of the fuses on the circuit board of the unit isblown.
• Loose wire, no power to unit.
• Loose wire between unit and control panel.
• Faulty or incorrectly set week program.
• Filter timer has switched the system off.
Condensed water is leaking from the unit
Possible error:
Condensation outlet blocked by dirt.
The condensation outlet is not adequately protected
against freezing at low outdoor temperatures.
8.3 Air faults
No supply air:
Possible error:
• Faulty supply air fan
• Clogged supply air fi lter
• Clogged fresh air grill due to dirt and leaves during the
fall and snow and ice during the winter.
• Fuse on the circuit board is blown.
• The unit is in defrost mode (supply air fan stops)
• Incorrect value set in User menu item 2.
No extract air:
Possible error:
• Faulty extract air fan
• Clogged extract air fi lter.
• Fuse on the circuit board is blown
Cold supply air:
Possible error:
• Clogged heat changer.
• Faulty extract air fan.
• Clogged extract air filter.
• Electrical reheater is disconnected at the over heating
thermostat (only units with electrical reheater
installed).
• Air in the heating pipes, faulty thermostat / motorvalve,
incorrect setting of control panel.
8. TROUBLESHOOTING

KVM-Genvex A/S •Sverigesvej 6 •DK-6100 Haderslev •Tel.: [phone] •[e-mail] •genvex.dk
THE AIR WE BREATHE
08:120-1606
Genvex –The original Danish Ventilation System
Genvex is a genuine Danish original. We invented the ventilation system
more than 40 years ago, and we are still ahead of the pack when it comes
to development and production of the strongest and most durable
ventilation system.
Our unit is working in thousands of homes providing fresh clean air – free
of pollen, dust and harmful particles. This helps to strengthen the health
of the house and to make the indoor environment healthy and
comfortable for lots of families. At the same time, our system is an
important element when it comes to saving energy in homes and in
society as a whole – in fact you can recover up to 95% of the heat energy
with a Genvex system.
All
Genvex
systems are
rated with
energy label
A
The original Genvex units are
assembled by skilled and
experienced technicians and
have a lifetime that in many cases is
measured in decades. The units are
approved by all applicable
standards and are easy to operate
and service. Last – but not least all
Genvex systems are developed with
focus on compact dimensions and
ease of installation and can be
integrated discreetly in all types of
homes.
We are part of the NIBE Group
– a family of companies that
specialize in supplying hot water,
heating and home comfort to
homeowners worldwide.
Please visit www.genvex.dk to see a list of our distributors