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83
Functions k.air +030220981 rel. 1.2 - 01.12.2020
9.21 S anifi cation device
k.air manages an optional sanifi cation device.
R if D escription D ev Min Max UoM D ir Modbus BAC net
U N IT
Ac06 Enable sanifi cation device FALSE 0 1 - R/W CS461 BV3957
DI1324 BV3958
Tab. 9.aw
Operation mode
Sanifi cation device is always on when the unit is switched on. In case of unit off by supervisor or scheduler, sanifi cation device
status can be set.
k.air manages a digital input alarm for sanifi cation device. If it is activated, ventilation works in normal operation but unit switches
to full fresh air (externa damper full open, mixing damper full closed).
R if D escription D ev Min Max UoM D ir Modbus BAC net
U N IT
Ac88 Mode sanifi cation during off by BMS or sched
(0:OFF, 1:ON, 2:INTERMITTENT) 0 0 2 - R/W HR1944 PIV3961
Sanifi cation time on intermittent 0 0 999 s R/W HR1945 PIV3962
Sanifcation time off intermittent 0 0 999 s R/W HR1946 PIV3963
Tab. 9.ax
9.22 P urge function
k.air manages a purge function. The function can be enabled:
• manual mode, by PGD1 or BMS, always available
• Daily scheduler at fi xed time
• Daily scheduler before fi rst unit start up whenever unit scheduler is enabled
• Both last two modes
R if D escription D ev Min Max UoM D ir Modbus BAC net
U N IT
Ac66 Purge function - Time 10 0 999 min R/W HR1949 PIV3972
Purge function - Automatic mode 0 0 3 - R/W HR1950 PIV3973
Purge function - Start hour 0 0 23 h R/W HR1951 PIV3974
Purge function - Start minute 0 0 59 min R/W HR1952 PIV3975
Tab. 9.ay
Operation mode
Purge function forces damper and fans at maximum load for a set delay. The purge can be activated with unit off or unit on. In
case of unit off , purge doesn’t aff ect temperature and humidity regulation. Viceversa, in case of unit on, thermoregulation devi-
ces calculate new thermal load.
Purge function are stopped in case of blackout.
9.23 F rost protection
The frost protection function (also referred to as antifreeze) is used to protect the unit against particularly harsh temperature
conditions. In particular, it is used to stop ice forming on the water coils and damaging them. This function can be enabled
both when the unit is On and in Off (useful for units installed outdoors).
Activation
Frost protection can be activated by:
• Frost protection thermostat ( digital input)
• Outside temperature probe
• Defrost temperature probe
R if D escription D ev Min Max UoM D ir Modbus BAC net
U N IT
Ac52 Antifreeze type (0: NONE; 1: Ext.Temp.; 2: AFreeze Temp.; 3: DigitalInput) 0 0 3 - R/W HR1348 PIV2856
Tab. 9.az
If the thermostat is active or the temperature read by the frost protection control probe falls below the threshold for longer than
the “warning delay”, the unit goes into “Frost protection” status.
If it remain in this mode for the “alarm delay” time, the unit switches off , going into “Off by alarm” or “Frost Off ” status, if enabled.