5.15 External dehumidifier
Optionally an external dehumidifier can be used.
The following control modes can be selected:
Mode
Design of dehumidifier
Running
Controls
1
Room installation with integrated
control
Always, except emergency or
maintenance
Internally by
dehumidifier
2
Room installation and part of
humidity control sequence
Always, except emergency or
maintenance
Humidity control
sequence
3
Duct installation with integrated
control
Only when plant in normal
operation
Internally by
dehumidifier
4
Duct installation and part of
humidity control sequence
Only when plant in normal
operation
Humidity control
sequence
In any mode, the external dehumidifier is switched off in case of emergency control
(fire / smoke) and in case of a controlled shutdown for maintenance.
If used within the humidity control sequence (Mode 2 and 4), a 2-point controller is
used with a minimum on / off time of 5 minutes (fix).
Available parameters
Current values
BACnet object
R/RW
Note
External dehumidifier
Prio 2: Fire / Smoke
Prio 5: Protection from plant control
DHumFrsdCmd
BO,60 (Q1)
BO,75 (Q2)
BO,90 (Q3)
BVAL,251 (POS9)
RW
Basic settings
BACnet object
R/RW
Note
Dehumidifier control mode
DHumCtlModCnf
MVAL,489
RW
1: Room, integrated ctrl.
2: Room, control sequence
3: Duct, integrated control
4: Duct, control sequence
Testing and debugging
BACnet object
R/RW
Note
Dehumidifier device mode
DHumDevMod
MVAL,488
RW
1: Off
2: Control
3: Max
Application functionalities
External dehumidifier
5
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