Configuration Manual

Version Document
A
001
A
ccess V4.X Configuration manual
32 (56) 2018-07-11
Configure: Configuration > Function Configuration > Recirculation
Enable supply air temperature control when recirculation running
 No temperature control
 Heating/cooling
 Heating
 Cooling
Enable the night cooling function when recirculation
 No
 Yes
Use Extra time channel 4 to start recirculation run
 No
 Yes
Exhaust air fan operation during recirculation run
 Not running
 Running
Fixed setpoint or setpoint adjustment when recirculation run
 Fixed setpoint
 Setpoint adjustment
Operation settings: Data & Settings > Demand control > Recirculation
Recirculation is a function for distributing the air in the room using the supply air
fan. The function can be used even when there is no heating or cooling demand.
When using recirculation control, the extract air fan stops (but can also be set to
run) and a recirculation damper opens which allows the air to circulate through the
unit.
If timer input for Extended operation is activated during recirculation via “Extra
timer group 4”, normal/reduced speed gets priority. If timer output for
normal/reduced speed is activated during recirculation via a digital input,
recirculation gets priority.
Analogue output (Recirculation 1 or Recirculation 2) is used as an output signal.
Recirculation control can be configured as either air circulation (temperature
control inactive) or air circulation with temperature control. (Only heating, only
cooling or both heating and cooling). Recirculation control has its own setpoint.
However, the other settings are the same as for normal operation, i. e. if normal
operation has been configured as room control, room control will also be used
during recirculation.
The recirculation setpoint can be configured as constant or offset. Constant means
that the recirculation setpoint will be used. Offset is based on an offset from the
supply air setpoint.
To lower the temperature, it is possible to configure free cooling to be used during
recirculation, if the conditions for free cooling are fulfilled. Then, the recirculation
damper closes, the supply and extract air dampers open and the extract air fan
starts (the supply air fan also starts, if it is not already running). If the free cooling
function is not configured for recirculation control and you want to cool down the
supply air via a low recirculation setpoint, the cooling battery will be used. A max.
room temperature can be configured for recirculation control. If the room
temperature rises above the set value (FS 25°C), recirculation will be stopped.