
Code Operating mode Description
AQ_VE ■Air quality Ventilation:
When ventilation requirements are high or the room air humidity
is too high, the unit heats or cools in pure ventilation operation.
The supply and exhaust air volume is based on the air quality.
Supply air fan................... MIN-MAX
Exhaust air fan................. MIN-MAX
Energy recovery............... 0-100 %
Extract air damper............ open
Recirculation damper ....... closed
Heating/cooling ................ 0-100 %
REC Recirculation
On/Off recirculation operation with TempTronic algorithm: During
heat or cool demand, the unit draws in room air, heats or cools it and
blows it back into the room. The room temperature set value day is
active. The flow rate is controlled in 2 stages.
Supply air fan................... 0 / MIN / MAX 1)
Exhaust air fan................. off
Energy recovery............... 0 %
Extract air damper............ closed
Recirculation damper ....... open
Heating/cooling ................ on 1)
1) Depending on heat or cool demand
DES ■Destratification:
To avoid heat build-up under the ceiling, it may be appropriate
to switch on the fan when there is no heat demand (either in
permanent operation or in on/off operation depending on the
temperature stratification, as desired).
EA Exhaust air
The unit extracts spent room air. There is no room temperature
control. Unfiltered fresh air enters the room through open windows
and doors or another system provides air supply.
Supply air fan................... off
Exhaust air fan................. on 1)
Energy recovery............... 0 %
Extract air damper............ open
Recirculation damper ....... closed
Heating/cooling ................ off
1) Adjustable flow rate
SA Supply air
The unit blows fresh air into the room. The room temperature set
value day is active. Depending on the temperature conditions, the
system controls the heating/cooling. Spent room air passes through
open windows and doors or another system provides extraction.
Supply air fan................... on 1)
Exhaust air fan................. off
Energy recovery............... 0 % 2)
Extract air damper............ open
Recirculation damper ....... closed
Heating/cooling ................ 0-100 %
1) Adjustable flow rate
2) Fresh air and bypass dampers are open
ST Standby
The unit is ready for operation. The following operating modes are
activated if required:
CPR ■Cooling protection:
If the room temperature drops below the set value for cooling
protection, the unit heats up the room in recirculation operation.
Supply air fan................... MAX
Exhaust air fan................. off
Energy recovery............... 0 %
Extract air damper............ closed
Recirculation damper ....... open
Heating/cooling ................ on
OPR ■Overheating protection:
If the room temperature rises above the set value for overheating
protection, the unit cools down the room in recirculation oper-
ation. If the temperatures also permit fresh air cooling, the unit
automatically switches to night cooling (NCS) to save energy.
NCS ■Night cooling:
If the room temperature exceeds the set value for night cooling
and the current fresh air temperature permits it, the unit blows
cool fresh air into the room and extracts warmer room air.
Supply air fan................... on 1)
Exhaust air fan................. on 1)
Energy recovery............... 0 %
Extract air damper............ open
Recirculation damper ....... closed
Heating/cooling ................ off
1) Adjustable flow rate
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Roof Vent ®KH | KC | KHC
Construction and operation
4 214 745-en-06