Section 6 – Control and Service menu
Bypass shutter Motor
Set the Bypass shutter to Open or Closed.
Defrost Heater
When fitted, the external defrost heater output can be switched On or Off.
Note: The heater output will not switch ON if the fans are not running.
Boost Heater
When fitted, the external boost heater output can be switched On or Off.
Note: The heater output will not switch ON if the fans are not running.
NOTE!
Further status and operation information for the ventilation unit can be found in the User Manual.
6.3.5 Installer menu – Auto Check Routine
The Autocheck menu is used to check, in sequence :
The Supply and Extract flow rates (% of full speed) at Speed 1 then 2 then 3
Manually open and close the Bypass shutter
Display the Fresh air temperature and the position of the Bypass shutter
Switch the Defrost heater on and off
Switch the Boost heater on and off
6.4 Operational functions
6.4.1 Bypass control
The Bypass is used to allow cool Fresh air to be supplied into the building without being warmed up by the
units heat exchanger. (The heat exchanger is “bypassed”).
This function can be used in summer in order bring cool outside air (e.g. at night) into the rooms.
The Bypass operates automatically and is setup using the “Adjust User Settings” in the User menu.
The switching temperature can be set within the range -20 to +39°C. The default setting is +21°C.
1 Bypass closed (heat recovery works)
2 Bypass open/enabled (no heat recovery)
3 Fresh-air temperature
4 Extract-air temperature t
B
Bypass
switching
temperature
Fig. 6.11 Bypass control
The Bypass only works during the months set in the User menu. The default setting is May to October.
A “B” in the normal display means that the Bypass is active / open. (Heat recovery is disabled).
The bypass is opened (heat recovery is disabled) when all of the following conditions are fulfilled:
Current date is within the set switching period (User menu /Adjust User Settings / Set up Summer Bypass)
and
Extract-air temperature is at least 1°C above the set switching temperature and
Fresh-air temperature is at least 1°C below the set switching temperature
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