De-icing with reduced fan speed started by TEh or TOa
The temperatures have 2 adjustable limits. The higher limit SpTDeicHExg (stage 1)
starts deicing with the bypass damper only, while the lower limit SpTDeicFan(stage
2) starts deicing with bypass damper and fan speed in parallel (2 stage approach).
During deicing, fan speed for supply fan and exhaust fan are reduced to
configurable values. For faster deicing, it is possible to set the supply fan speed
setpoint even to 0%. In this case electric heaters in the supply air are blocked.
Example diagram of stage 1 and stage 2 behavior
Available parameters
Actual values
BACnet object
R/RW
Note
Deicing request for heat exchanger
DeicReqHExg
BVAL,305
R
Deicing request for fan
DeicReqFan
BVAL,306
R
Heat exchanger differential pressure
monitor
HExgDiffPMon
BI, 77
BI, 94
BI, 111
BI, 128
R
Application functionalities
Energy Recovery
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A6V10733786_en_c
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