Service manual

CONTROL SYSTEM
OAT – Outdoor Air Temperature
TLD – Time from Last Deicing
DI – Deicing Interval (Time Interval between Two Deicing)
DST – Deicing static threshold (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 inter
val time is changed (increased/ decreased in 10 minutes steps) as a function of
deicing time. If deicing time is shorter then former deicing time, the deicing interval time will be
increased. If deicing time is longer then former deicing time, the deicing interval time will be
decreased.
11.5.8.2 Deicing Protection Procedure
OCT
RV
OFAN
ON
ON
EEVDei
T1
T3
T1
12
0
i
DT
COMP
EEV
HEAT
COOL
OFF
cerOpen
Any
T2
T3
Threshold
max. 12 m nutes
T1 = T2 = 36 seconds, T3 = 6 seconds
11.5.9 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
11.5.9.1 3 Levels Logic (used in floor/ceiling models)
P2 P3 Level
0 0 L0
1 0 L1
1 1 L2&3
Revision 0
11-17