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8. DESCRITION OF FUNCTIONS
• COOLING OPERATION
If the rotary switch is turned to “COOL”, the unit starts to cooling operation.
The power is not supplied to the de-ice controller P.C.B(Deicer PCB) in this mode.
The fan motor is “ON” when rotary switch is turned to “COOL” because RL1(on the P.C.B) is normally close.
• HEATING OPERATION
If the rotary switch is turned to “HEAT”, the unit starts to heating operation.
The power is supplied to the de-ice controller P.C.B in this mode.
Fan motor, Reversing valve, Lamp, (Heater Pump), these parts go on just turnning the rotary switch to “HEAT” because
RL1 is normally close.
The de-ice mode of heating operation is follows below.
• DE-ICE OPERATION
When the power is supplied by the turnning rotary switch to “HEAT”, the micro-computer chip(on the P.C.B) starts to
check the time and temperature.
Entering de-ice operation(to turn cooling cycle).
1. The micro-computer chip is check the temperature of condensor, After 50 minutes since the units starts on heating
mode.
2. If the Temperature is below -4˚C, RL1 goes on.
3. Then, all parts of concerning with RL1 go off also, such as Fan motor, Lamp, Reversing valve.
4. Now, the unit turned to cooling operation but fan motor is off.
Back to heat mode.
1. On the de-ice operation if the temperature is going over 15˚C, RL1 goes off.
2. Or 10minutes passed on the de-ice operation, RL1 goes off also.
3. Now the unit turned to heating mode because RL1 off means all parts turned on also.
such as Fan motor, Reversing valve, Lamp.
Remark : This de-ice operation is always repeat in heating mode when satisfying of the condition to enter the de-ice
operation.
ON
Time
50minutes
10minutes
Sensing
Temperature
Compressor
(Heater Pump)
Fan motor
(Reversing valve)
(Lamp)
ON
(-4
°
C)
(15
°
C)
ON
OFF
