Panasonic S-32NA1E5, Service Manual

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13.3 Deice Control
•
This control will operate for 1 cycle after accumulation time for heating (Compressor ON) under low outdoor
ambient environment as stated in table below:
Outdoor Air Temperature (°C) Heat exchanger temperature (°C) Acc. Time (minutes)
-5 to -7 75
-3 & above
-7 or below 45
-10 to -12 100
-3 to -10
-12 or below 85
-20 to -22 115
Below -10
-22 or below 85
•
During deice control, for indoor units in ON condition:
o
Indoor fan OFF
o
Power LED blinking
o
Expansion valve fully opened
o
During deice control, for indoor units in OFF condition:
o
Expansion valve fully opened
•
Deice control start condition:
Trigger
Condition
Control
Reset
ON
OFF
Defrost
Compressor
ON
OFF
4 Way Valve
OFF
Outdoor Fan
480 pulse (full open)
Gas Bypass Valve
ON
Liquid Bypass Valve
Normal
480 pulse (full open)
Indoor Fan
Stop
1k
3k
Deice Temperature
sensor
30 sec
z Deice control will end if below condition is fulfilled; whichever comes first.
o
Outdoor Heat Exchanger Discharge temperature achieved:
Outdoor Ambient Temperature (°C) Deice Temperature sensor (°C)
-3 & above 11 or more
-3 to -10 5 or more
Below -10 3 or more
o
10 minutes has elapsed
13.4 Crank Case Heater Control
•
This control is used to prevent condensation of refrigerant inside compressor and keep the temperature of
compressor oil at the suitable level.
•
Crank case heater will ON if below conditions are all fulfilled:
o
Compressor is OFF.
o
Outdoor ambient temperature is less than 15°C.
o
Compressor discharge temperature is less than 15°C.
o
Crank case heater will OFF if either of conditions below is fulfilled:
o
Compressor is ON.
o
Outdoor ambient temperature is more than 17°C.
o
Compressor discharge temperature is more than 17°C.