
54
Functions
k.air +030220981 rel. 1.2 - 01.12.2020
30220980_185_R01
ON REQUEST
WARM UP ENABLED
SHUT DOWN
STEADY STATE
Fresh air damper = 100%
Exhaust air damper = 100%
ALARM
All retries have been attempted
Mixing damper = 100%
Dampers open
Supply fan delay
Return fan = warm up request
Heating coil = warm up request
Heat/Cool coil = warm up request
Bypass damper = warm up request
Warning: supply air flow error
ALARM
All retries have been attempted
Warning: supply air flow error
Supply fan = warm up request
Warm up delay
MIXING
DAMPER ?
RETURN
FAN ?
EXT_TEMP > =
WARM_UP_THR
FLOW
OK ?
FLOW
OK ?
All retries
have been
attempted ?
All retries
have been
attempted ?
NO
NO
NO
NO
YES
YES
YES
YES
NO
YES
NO
NO
YES
YES
Fig. 9.f
9.4 Types of control
The main control on the unit is temperature control, using one of the following probes or combinations:
1. Supply
2. Return
3. Room
4. supply
5. Room+supply
In the fi rst three modes, the temperature control request depends directly on the comparison between set point and the se-
lected probe reading. In the remaining two modes, cascade control is activated, so as to simultaneously control two points: the
temperature request is always calculated based on the supply temperature probe, the supply set point is calculated using the
return set point (considered as the main set point) by adding/subtracting an off set, based on the deviation of the return/room
probe values. See the chapter on Temperature control for more details.
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