12-12
CONTROL SYSTEM
SM OU12HP 2-E.2 GB
12.5.10 Deicing
12.5.10.1 Deicing Starting Conditions
Deicing operation will start when either one of the following conditions exist:
Case 1: OCT is 8 degree lower then the ambiant temp and the minimum time from the last deicer
is passed.
Case 2: OCT is 12 degree lower then the ambiant temp and 30 minutes from the last deicer wa
passed.
OCT – Outdoor Coil Temperature
Deicing interval time when compressor is first started in heat mode, is 10 minutes if OCT < -2, and
is 40 minutes in other cases.
Deicing interval time is changed (increased/ decreased in 10 minutes steps) as a function of
deicing time.
In case one of the thermistors is bad the deicer will initiate in predefined intervals
Deicer may accure also when the unit switch to stanby and the OCT is 8 degree lower then
ambiant temperature.
12.5.10.2 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 = T2 = 36 seconds, T3 = 6 seconds
12.5.11 Condensate Water over Flow Protection
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
P1 P2 P3 P4
To Next Page
Loading...
