13-26
CONTROL SYSTEM
Revision Y05-01
Service Manual - DNG Series
Notes :
1. At the first COMP activation after SB or OFF, if (OCT < 0
o
c), then DI = 10
min, else DI = 40 min.
2. In the following Deicing cycles, the time interval between two Deicing cycles
activation is between 30 to 80 min (refer to the flow chart).
1. For RC group, HEs are forced OFF. IFAN operation is as in Heat Mode,.
IFAN will be set to OFF when ICT<30
o
c.
For WAX, the IFAN is simply forced OFF.
3. For SH group, HEs are forced ON and IFAN is forced to operate in Low
speed, regardless of the ICT and difference between RAT & SPT.
13.8.4 . High pressure protection (excluding RH Group)
Mode: (Auto) Heating
Fan: Any
Timer: Any
I Feel: On or Off
Control Function
Protect the Compressor from high pressure by switching OFF the OFAN and COMP.
ICT [
o
c]
Any
Off
Any
Off
COMP
OFAN
52
55
61
66
COMP is forced OFF
67
OFAN is force
Off
COMP is forced OFF
For all models except WAX For WAX model
ON
BLINK
OPER
LED
Notes:
1. IFAN, HE1 and HE2 will be activated according to the relevant Heating
Mode Sect.
2. In case of any malfunction in the relay control circuit, the OCT is also
monitored during heating mode. Whenever OCT reaches 70
o
c, which
indicates a high pressure in the outdoor coil, the COMP will be forced off
automatically. The COMP can be turned on again only after the 3 min
COMP ON delay and the OCT is under 70
o
c. The OPER LED will not blink
in this case.
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