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72
Functions
k.air +030220981 rel. 1.2 - 01.12.2020
R if D escription D ev Min Max UoM D ir Modbus BAC net
U N IT
Ac04 Humidifi er type (0: 0-10V; 1: Humisonic) 0 0 4 - R/W HR1294 PIV2802
Enable dehumidifi cation regulation FALSE 0 1 - R/W CS226 BV226
IEC type (0: None; 1: OnOff ; 2: Modulating; 3: Humisonic) 0 0 3 - R/W HR1295 PIV2803
IEC: IO confi guration warning - 0 1 - R DI698 BV1156
DI699 BV1157
Ac32 Humidifi cation/Dehumidifi cation: Control probe 0 0 2 - R/W HR1318 PIV2826
Humidifi cation/Dehumidifi cation: Control type 0 0 1 - R/W HR1319 PIV2827
Ac34 Dehumidifi cation: Regulation type 0 0 1 - R/W HR1320 PIV2828
Dehumidifi cation: enable kwater dew point calculation FALSE 0 1 - R/W CS227 BV227
Ac36 Humidifi cation/Dehumidifi cation: Regulation band 20.0 1.0 99.0 %rh R/W HR1321 AV2829
Humidifi cation/Dehumidifi cation: Regulation change delay time 5 0 99 min R/W HR1322 PIV2830
Tab. 9.z
Note:
absolute humidity control, once enabled, applies to both dehumidifi cation and humidifi cation.
9.14 Humidifi cation
Humidifi cation is controlled by a PID controller and via confi guration of an analogue, digital or serial.
The type of humidifi er used needs to be specifi ed, selected from the following:
• Isothermal, 0-10 V signal or on/off .
• Adiabatic, 0-10 V signal or on/off .
• HumiSonic, the request is sent via serial;
• Humifog, the request is sent via serial;
If selecting adiabatic humidifi ers, a number of dedicated functions are available (e.g. scheduled maintenance as per VDI).
30220980_182_R01
100%
0%
Set
Room humidity
Request
diff
key
Humidity Control humidity
Request Humidity request
Set Humidity set point
Diff Diff erential = 100/kp
Fig. 9.ac
Maximum supply humidity limit control
Maximum humidity limit control is a PI algorithm that modulates the request to the humidifi er based on a settable threshold
value, thus controlling the supply humidity. This function is only active with return or room humidity control, using the parame-
ters available on screen F008.
Minimum supply temperature limit control with adiabatic humidifi cation
This function is only available with an adiabatic humidifi er and is useful for counteracting the eff ect of excessively reducing
the temperature when the heating coils are not suffi
cient or when humidifi cation is active in cooling mode (when the heating
devices are typically not functioning). The function uses PI control and the main supply temperature limit control threshold set
on screen Ac60. The eff ect is a progressive increase in heating device output, in heating mode (if present), and, subsequently, a
reduction in humidifi er output, which is the only active stage in cooling mode.