Panasonic S-22KA1E5S - 13.5 Deice Control

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13.4 Sub Cool Control
Sub Cool Control only will operate during cooling mode with below conditions are fulfilled :
- Cooling Operation.
- Outdoor air temp > - 5°C.
- Outdoor high pressure sensor temp value > 27°C.
- Total Operating Indoor capacity > 1.6HP.
Due to Super heat is happened, Sub Cool Expansion Valve more opening if below condition happened :-
(Bypass Pipe Temp – Low Pressure Sensor Temp Value) – Target
Due to Present of Sub Cool, Sub Cool Expansion Valve less opening if below condition happened :-
(Hi Pressure Sensor Temp Value – SC Pipe Temp) – Target
Sub Cool Expansion Valve is full close when above conditions not fulfilled.
13.5 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 55
-15 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
• 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
30Hz
Compressor
80Hz
60Hz
50Hz
30Hz
ON
OFF
4 Way Valve
OFF
Outdoor Fan
480 pulse (full open)
Outdoor Expansion Valve
Gas Bypass Valve
ON
Liquid Bypass Valve
Normal
480 pulse (full open)
Indoor Expansion Valve
Indoor Fan
Stop
1k
3k
DEF_Th
60 sec
Sub Cool
Expansion Valve
ON