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7. Maintenance
B
A
G
L
K
H
I
J
Indoor unit
Refrigerant gas cylinder for R32 with siphon
A
H
Union
Refrigerant (liquid)
B
I
Liquid pipe
Electronic scale for refrigerant charging
C
J
Gas pipe
Charge hose (for R32)
D
K
Stop valve
Gauge manifold valve (for R32)
E
L
Outdoor unit
Service port
F
M
Refrigerant gas cylinder
G
operating valve
Fig. 7-1
8. Pumping down
When relocating or disposing of the air conditioner, pump down the system following
the procedure below so that no refrigerant is released into the atmosphere.
1 Turn off the power supply (circuit breaker).
2 Connect the gauge manifold valve to the service port of the stop valve on the gas
pipe side of the outdoor unit.
3 Fully close the stop valve on the liquid pipe side of the outdoor unit.
4 Supply power (circuit breaker).
5 Perform the refrigerant collecting operation (cooling test run).
• For the PAR-31MAA, select "Service" → "TestRun" from the main menu to start
the test run, and then select the cooling mode.
• For details or for other information about starting the test run when using re-
mote controllers, refer to the installation manual for the indoor unit or the re-
mote controller.
6 Fully close the stop valve on the gas pipe side of the outdoor unit when the pres-
sure gauge shows 0.05 to 0 MPa [Gauge] (approx. 0.5 to 0 kgf/cm
stop the air conditioner.
• Push the "ON/OFF" button on the remote controller to stop the air conditioner.
* Note that when the extension piping is very long with a large refrigerant
amount, it may not be possible to perform a pump-down operation. In this case,
use refrigerant recovery equipment to collect all of the refrigerant in the system.
7 Turn off the power supply (circuit breaker), remove the gauge manifold valve, and
then disconnect the refrigerant pipes.
Warning:
When pumping down the refrigerant, stop the compressor before disconnect-
ing the refrigerant pipes.
• If the refrigerant pipes are disconnected while the compressor is operating
and the stop valve (ball valve) is open, the pressure in the refrigeration cycle
could become extremely high if air is drawn in, causing the pipes to burst,
personal injury, etc.
E
C
F
D
M
) and quickly
2
7.1. Gas charge (Fig. 7-1)
1. Connect gas cylinder to the service port of stop valve (3-way).
2. Execute air purge of the pipe (or hose) coming from refrigerant gas cylinder.
3. Replenish specified amount of refrigerant, while running the air condition-
er for cooling.
Note:
In case of adding refrigerant, comply with the quantity specified for the refrig-
erating cycle.
Caution:
• Do not discharge the refrigerant into the atmosphere.
Take care not to discharge refrigerant into the atmosphere during installa-
tion, reinstallation, or repairs to the refrigerant circuit.
• For additional charging, charge the refrigerant from liquid phase of the gas
cylinder.
If the refrigerant is charged from the gas phase, composition change may
occur in the refrigerant inside the cylinder and the outdoor unit. In this case,
ability of the refrigerating cycle decreases or normal operation can be im-
possible. However, charging the liquid refrigerant all at once may cause the
compressor to be locked. Thus, charge the refrigerant slowly.
To maintain the high pressure of the gas cylinder, warm the gas cylinder with warm
water (under 40°C) during cold season. But never use naked fire or steam.
23
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