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Shutdown mode (Only if frost protection sensor has been
configured)
Whenever the running mode switches to "Off", (normal shut-down or frost protection is
activated) the controller will go into "Shutdown mode". The shutdown controller will
control the output that has been tied to the frost protection function to maintain a constant
25°C at the frost protection sensor.
Outdoor compensation
In control mode 2, Supply air control with outdoor temperature compensation, the supply air
temperature setpoint can be displaced according to outdoor temperature. The displacement
starts from 0 at outdoor temperature S.P. and increases to reach the value CMP at -20°C
outdoor temperature. Example: Normal setpoint = 20, S.P.=10 and CMP = 5 will give the
following result:
Setpoint
Setpoint +CMP
25° C
Setpoint
20° C
-20° C
Damper
It is possible to set a minimum limit value to the damper output signal. The damper-output
will then not go lower than the set value during normal operation. On shut-down however the
signal will go to zero.
In the output mode heating – damper the damper will be fully open for temperatures higher
than the setpoint. On increasing heat demand the damper will first close to the minimum
value before the heating output starts to increase.
In the output mode cooling – damper the damper will be fully open for temperatures lower
than the setpoint. On increasing cooling demand the damper will first close to the minimum
value before the cooling output starts to increase.
Fan indication
Unless this input is activated indicating that the fan is running, the controller will not start
normal temperature control and an alarm will be generated. An alarm will also be generated
if the input is activated in spite of the fan control output being off.
Extended running
Activation of this input will force the controller to running mode even if internal scheduler is
in Off-mode. The unit will run as long as the input is activated.
Outdoor temp
10° C
S. P .
15
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