Recover refrigerant to indoor units and MS boxes
In order to recover the refrigerant from the outdoor unit to indoor units, MS boxes and connection pipes, this pump-down
operation is conducted as below and the LED display r002 in this control.
Table 3-8.2: Recover refrigerant to indoor units and MS units
Tcs = 43°C
Upper limit: 60 Hz
Electronic
expansion valve
Refer to startup
control in Heating
operation
Heating only normal control
Heating only normal control
Heating only normal control
Electronic
expansion valve
Electronic
expansion valve
Electronic
expansion valve
Meet any points below:
• Pump down time elapses 5min.
• Pe < 0.12MPa
• T7C_Max ≥ 105°C
• Pc ≥ 3.6MPa
Notes:
1. Pc: Discharge pressure Pe: Suction pressure
2. Tcs : Target condensing temperature T7C1: Compressor discharge temperature
Vacuum control
This control is used to open solenoid valves and electronic expansion valves in the whole system. The LED display r003 to
activate this control.
 During the vacuum work, the high/low pressure sensor error and low pressure protection should be ineffective (Use
short connectors if not).
 The 4-way valve is OFF, and compressors or fans are prohibited to run.
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