Midea V6R VRF Series Service Manual page 48

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
Component
Inverter
compressor A
Inverter fan 1
Inverter fan 2
Four way valve
ODU
Electronic
expansion valve
Solenoid valve
Electric ball
valve
MS01
Electronic
expansion valve
Solenoid valve
MS04-12
Electronic
expansion valve
Fan
IDU
Electronic
expansion valve
Ending conditions
Notes:
1. Pc: Discharge pressure Pe: Suction pressure
2. Tcs : Target condensing 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.
Wiring
Startup control
diagram
label
INV1
FANA
FANB
ST1 ON
EEVA
EEVC
SV5
SV8A
SV7
EVBA
EVBB
EVBC
EEVA
Refer to startup
SV(n)A
control in Heating
operation
SV(n)B
SVP
EEVA
Fan
EEV
T7C1: Compressor discharge temperature
Normal control
Tcs = 43°C
Upper limit: 60 Hz
PI control
ON
Heating only normal control
0pls
ON
ON
OFF
Heating only normal control
30min or Pe< 0.2MPa
V6R VRF 50Hz
Pump down
30Hz
PI control
ON
Heating only normal control
0pls
ON
ON
OFF
Meet any points below:
• Pump down time elapses 5min.
• Pe < 0.12MPa
• T7C_Max ≥ 105°C
• Pc ≥ 3.6MPa
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