V6R VRF 50Hz
47
P
art
3
- Con
tr
ol
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
Wiring
diagram
label
Startup control
Normal control
Pump down
ODU
Inverter
compressor A
INV1
Tcs = 43°C
Upper limit: 60 Hz
30Hz
Inverter fan 1
FANA
PI control
PI control
Inverter fan 2
FANB
Four way valve ST1
ON
ON
ON
Electronic
expansion valve
EEVA
Refer to startup
control in Heating
operation
Heating only normal control
Heating only normal control
EEVC
0pls
0pls
Solenoid valve
SV5
ON
ON
SV8A
ON
ON
SV7
OFF
OFF
MS01
Electric
ball
valve
EVBA
Heating only normal control
EVBB
EVBC
Electronic
expansion valve
EEVA
MS04-12
Solenoid valve
SV(n)A
SV(n)B
SVP
Electronic
expansion valve
EEVA
IDU
Fan
Fan
Electronic
expansion valve
EEV
Ending conditions
30min or Pe< 0.2MPa
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.
