7-25
CONTROL SYSTEM
Revision Y05-01Service Manual - EMD Series
7.1.2. High Pressure Protection
Mode: (Auto) Cooling or Dry
Temp: Selected desired temp.
Fan: Any
Timer: Any
I Feel: On or Off
Control Function
To protect the COMP from the high pressure built-up in the outdoor coil during normal cooling operation, by switching OFF the
IFAN and COMP.
OCT [
o
c]
Any
OFF
Any
ON
Any
Blink
ON
COMP
OFAN
IFAN
OPER
LED
52
55
61
66
L
COMP is forced OFF
OFAN is forced ON
IFAN forced
to LOW
68
OFAN follow operation of
COMP
COMP is forced OFF
OFAN is forced ON
For all models except WAX & P2000 For WAX & P2000 models
Note:
1. The ICT is also monitored during Cool and Dry mode, in case the RV control circuit is faulty. Whenever ICT
reaches 70
o
c, which indicates a high pressure in the indoor coil, the COMP will be forced off automatically. The
COMP can be turned on again only after the ICT is under 70
o
c again and after the 3 min COMP ON delay time.
The OPER LED will not blink in this case.
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