Mitsubishi Electric PU(H)Y-P250YGM-A, Service Handbook

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[
IX
Troubleshooting ]
20) Attach the soundproof material to the compressor.
21) Attach the discharge temperature thermistor, and attach the insulation.
22) Attach the power source wire to the terminal on the compressor.
23) After vacuuming, calculate the amount of added refrigerant at factory shipment and the amount of added refrig-
erant on site, and charge the system.
24) After reconfirming the power source-wiring phase, apply a megger, attach the terminal cover, turn on the main
power, and check whether the crankcase heater is powered.
25) Check that the ball valves (both on the liquid and the gas side) are open.
26) Operate all the indoor units, and check whether they run properly.
27) If there is something that needs to be improved in the installation or the usage, explain that to the customers.
[7] Collecting the Cooling Liquid from the Accumulator (Only P500 type)
1) Perform evacuation inside the recovery cylinder.
2) Connect the check joint for collecting liquid that is derived from the accumulator and the recovery cylinder with a
connection pipe (or hose that has predetermined withstand pressure).
Note: When the check joint and the connecting pipe (hose) are connected, extremely low-temperature oil may
flow out. Use some protective clothing, such as leather gloves.
3) Open the valves of the recovery cylinder while the recovery cylinder is being weighed, and collect the liquid inside
the accumulator into the cylinder.
Note: Allow some capacity when collecting the refrigerant so that the recovery cylinder will not overflow. Use
several cylinders when collecting large amount of refrigerant.
4) After collecting the refrigerant, close the valve of the recovery cylinder, and remove the connecting pipe (hose).
Note: When the check joint and the connecting pipe (hose) are connected, extremely low-temperature oil may
flow out. Use some protective equipment, such as leather gloves.
5) Charge 3-liter oil from the check joint on the accumulator during evacuation.
No.1 Compressor Soundproof material No. 2 compressor
Oil balance
pipe joint
Metal fitting 1 Oil-equalizing pipe Metal fitting 2 Flare Nut Drain oil plug Flare nut
Check joint for draining liquid