Mitsubishi Electric PUHY-P450YKB-A1.TH [31/106] 8 evacuation of the system

Mitsubishi Electric PUHY-P450YKB-A1.TH [31/106] 8 evacuation of the system
GB
GB-29
KD79S703H01
9-8. Evacuation of the system
Do not purge the air using refrigerant. Use a vacuum pump to evacuate the system.
- Residual gas in the refrigerant lines will cause bursting of the pipes or an explosion.
Use a vacuum pump with a check valve.
- If the vacuum pump oil flows back into the refrigerant lines, the refrigerant oil may deteriorate
and the compressor may malfunction.
<Evacuation procedures>
Evacuate the system from both service ports, using a vacuum pump with the service valves closed.
After the vacuum reaches 650 Pa, continue evacuation for at least one hour.
Stop the vacuum pump and leave it for an hour.
Verify that the vacuum has not increased by more than 130 Pa.
If the vacuum has increased by more than 130 Pa, water infiltration is suspected. Pressurize the system with dry
nitrogen gas up to 0.05 MPa. Repeat though until the vacuum is increased by 130 Pa or below. If the
results persist, then perform the "Triple Evacuation" below.
<Triple Evacuation>
Evacuate the system to 533 Pa from both service ports, using a vacuum pump.
Pressurize the system with dry nitrogen gas up to 0 Pa from the discharge service port.
Evacuate the system to 200 Pa from the suction service port, using a vacuum pump.
Pressurize the system with dry nitrogen gas up to 0 Pa from the discharge service port.
Evacuate the system from both service ports, using a vacuum pump.
After the vacuum reaches 66.7 Pa, stop the vacuum pump and leave it for an hour. A vacuum of 66.7 Pa must
be maintained for at least one hour.
Verify that the vacuum has not increased for at least 30 minutes.
LO
HI
ⒷⒸ
Gauge manifold
Low pressure knob
High pressure knob
Service valve
Liquid piping
Gas piping
Service port
Three-way joint
Valve (vacuum pump)
Valve (for charging refrigerant)
Refrigerant tank
Scale
Vacuum pump
To indoor unit
Outdoor unit
Use a scale that can measure down to 0.1 kg (0.1 oz).
Recommended vacuum gauge: ROBINAIR 14830A Thermistor Vacuum Gauge or Micron Gauge
Do not use a gauge manifold to measure the vacuum pressure.
Use a vacuum pump capable of attaining a vacuum of 65 Pa (abs) within five minutes of operation.

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