CONTROL SYSTEM
SM PNXADCI 1-A.1 GB
12-9
DST is defined as:
When OAT>0 or OAT is invalid; then DST=8
When OAT≤0; then DST= round down (-DeicerCoef * OAT) + 8
Deicing interval time when compressor is first started in heat mode is 30 minutes.
Deicing interval time is changed (increased/ decreased in 10 minutes steps) as a function of deicing
time. If deicing time is shorter than former deicing time, the deicing interval time will be increased. If
deicing time is longer than former deicing time, the deicing interval time will be decreased.
12.7.8.2 Deicing Protection Procedure
COMP
RV
OFAN
EEV
ON
HEAT
COOL
ON
OFF
EEVDeicerOpen
Any
T1 T2
T3 T3
T1
12
0
Threshold
max. 12 minutes
DT
OCT
T1 = DEICT1 seconds, T2 = DEICT2 seconds, T3 = DEICT3 seconds
12.7.8.3 Exiting Deicing
OCT > OCTExitDeicer or Deicer current time is over MaxDeicerTim
e
minutes.
12.7.9 Condensate Water Over Flow Protection
Outdoor unit receives “overflow’ signal from the indoor side.
Each of the pins P1, P2, P3 can have two options:
1 – When it is shorted with P4
0 – When it is not shorted to P4
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