Panasonic S-22ML1E5, Service Manual & Test Run Service Manual

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Mini VRF SYSTEM
Outdoor Unit Repair Procedures
3
8. Compressor
8-2. Replacing the Compressor(s)
8-2-1. Replacing compressor
(1) Follow the instructions in “8-3. Removing Compressor” and replace the failed compressor.
(2) Fully close the high- and low-pressure gauge valves on the manifold gauge, then stop the vacuum pump.
(3) Disconnect the manifold gauge from vacuum pump. Connect the manifold gauge to the cylinder where the
refrigerant was recovered. At this time, be careful that air does not enter the tubing.
(4) Open the valve on the refrigerant recovery cylinder and the high-pressure gauge valve on the manifold gauge to
charge with refrigerant. At this time, the low-pressure gauge valve on the manifold gauge remains fully closed.
If the recovered refrigerant becomes mixed with another refrigerant or another gas
(such as nitrogen or air), do not use the recovered refrigerant for charging. Charge
with the designated amount of new refrigerant.
CAUTION
(5) When charging has been completed with an amount of new refrigerant equal to the amount of recovered
refrigerant, or when charging with the same amount of new refrigerant has not been completed but no more
refrigerant will enter the unit, fully close the high-pressure gauge valve on the manifold gauge. Next, turn
the power OFF at the repaired outdoor unit, then remove the short circuit at the AP pin. Finally, fully open all
valves on the gas tube and liquid tube.
(6) If charging with an amount of new refrigerant equal to the amount of recovered refrigerant was not possible,
fully close the high-pressure gauge valve on the manifold gauge. Then, while the unit is operating in “3-2-1.
Cooling operation (for all units)”, open the low-pressure gauge valve on the manifold gauge and charge with
the designated amount of refrigerant.
When charging with liquid refrigerant, add refrigerant a little at a time in order to
prevent liquid back-flow.
CAUTION
(7) If necessary, follow the instructions in “6. Charging Compressor Oil,” and charge with oil.
(8) Remove the manifold gauge.
The connecting port employs a Schrader-type push-to-release valve. When discon-
necting the hose, pressure will be applied from the refrigerant in the outdoor unit.
CAUTION
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