Service Manual 157
Function
• If power is on, it will operate to charge capacitor on controller and power relay will operate after about
2~5sec.
• The final operating freq. of comp. is set to sum of operating indoor unit capacities.
• Hot gas and Liquid injection control by solenoid valve
• It will be changed the drive voltage of comp. according to operating frequency.
• It is only operated in the heating operation mode except defrosting operation.
• High speed/Low speed
Outdoor Unit
Power relay control
Comp. Freq. control
Overheatng and over current Protection(IPM)
Bypass control
V/F control
Total current control (over current protection)
4 way valve control
Outdoor fan motor control
Discharge pipe temperature control
LEV Control
Discharge Pressure control
Suction Pressure control
Scroll compressor that operates on 30~120Hz by inverter drive enables
capacity control.
The oil separator is a device that collects the discharged oil from the
Compressor. The collected oil is constantly recycled to the compressor via
capillary tube.
High pressure sensor for sensing the operating status of the indoor by refriger-
ant pressure which senses discharge pressure.
Low pressure sensor for sensing the operating status of the indoor by refriger-
ant pressure which senses suction pressure.
Valve is open by low pressure safety control when pressure drops.
Controls liquid injection in order to prevent overheating.
Linear expansion valve is controlled by micro controller when heating.
When cooling linear expansion valve is fully opened.
Inverter Compressor
Oil separator
High Pressure Sensor
Low Pressure Sensor
Hot gas Solenoid valve
Liquid Injection Solenoid valve
Linear Expansion Valve(LEV)
2. Function
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