85
14.10 4-Way Valve Control
• 4-way valve always on during Heating operation. (except deicing operation)
• When the unit is switched off by remote control during Heating operation, the 4-way valve stay at Heating
position for 5 minutes.
• This is to prevent the refrigerant flow process sound for being occur.
14.11 Outdoor Fan Motor Control
• When compressor stops (reaches room temperature), outdoor fan will operate for 30 seconds (forced operation).
• This is to release the heat and to obtain the lowest pressure as fast as possible.
14.12 Hot Start Control
• Hot start control is to prevent cool air discharge into room when heating operating starts.
• Hot start is executed after heating operation starts and deice operation is completed.
• Indoor fan control during hot start is shown below:
Indoor Pipe Temperature Indoor Fan
≤ 30°C OFF
30°C < t ≤ 34°C SLo
t ≥ 34°C Lo-
• When indoor pipe temperature over 34°C or maximum 240 seconds, hot start is completed.
• During hot start and for 30 seconds after hot start completed, intake thermostat is ignored and no Thermo OFF.
14.13 Cold Draft Prevention Control
• This operation is to prevent the Cold Draft during Heating mode operation.
• The operation will start when compressor OFF (Thermo OFF) during Heating operation.
• For the first 30 sec. from compressor OFF (Thermo OFF), Indoor fan speed will operate accordingly to the Indoor
heat exchanger temperature as shown below:
• After 30 sec. from compressor OFF (thermo OFF), Indoor fan will run at SSLo speed only.
• Anti Cold Draft Control will stop when:
o Intake temperature < set temperature. (Time Delay Safety Control 4 minutes waiting is valid)
o 30 Minutes Time Save Control activates.
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