De-icing with reduced fan speed started by TEh or TOa
The temperatures have 2 adjustable limits. The higher limit (stage 1) starts de-icing
with ERC only, while the lower limit (stage 2) starts de-icing with ERC and fan
speed in parallel (2 stage approach).
During de-icing, fan speed for supply fan and exhaust fan are reduced to
configurable values. For faster de-icing, 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
Off-period
determination
Off-period
determination
B6 temperature
Activation
time
Activation
time
Activation
time
Off-time
(B6 adjusted)
Off-time
(B6 adjusted)
Off-time (maximum)
Activation
time
Stage 1
setpoint
Stage 2
setpoint
Normal
operation
De-icing
rotor speed
Normal
operation
De-icing
fan speed
Fan
operation
(stage 2)
RMC
operation
(stage 1)
De-icing
temperature
levels
Available parameters
Actual values
BACnet object
R/RW
Note
De-icing request for heat exchanger
DeicReqHExg
BVAL,182
R
De-icing request for fan
DeicReqFan
BVAL,183
R
Heat exchanger differential pressure
monitor
HExgDiffPMon
BI, 77
BI, 94
BI, 111
BI, 128
R
Application functionalities
Energy Recovery
5
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A6V10733786_en_c
