– 34 –
Gas side
(12.7 mm (diam.))
Gas side
(9.52 mm (diam.))
Liquid side
(6.35 mm (diam.))
Service port
50 to 62 N•m
(5.0 to 6.2 kgf•m)
33 to 42 N•m
(3.3 to 4.2 kgf•m)
14 to 18 N•m
(1.4 to 1.8 kgf•m)
14 to 18 N•m
(1.4 to 1.8 kgf•m)
9-7. Evacuating
AIR PURGE
Evacuate the air in the connecting pipes and in
the indoor unit using vacuum pump.
Do not use the refrigerant in the outdoor unit.
For details, see the manual of vacuum pump.
[Use a vacuum pump]
Be sure to use a vacuum pump with counter-flow
prevention function so that inside oil of the pump
does not flow backward into pipes of the air condi-
tioner when the pump stops.
1. Connect the charge hose from the manifold valve
to the service port of the gas side packed valve.
2. Connect the charge hose to the port of vacuum
pump.
3. Open fully the low pressure side handle of the
gauge manifold valve.
4. Operate the vacuum pump to start for evacuating.
Perform evacuating for about 35 minutes if the
piping length is total 70 meters.
(25 minutes for total 50 meters)
(assuming a pump capacity of 27 liters per
minute.)
Then confirm that the compound pressure gauge
reading is –101 kPa ( –76 cmHg).
5. Close the low pressure side valve handle of
gauge manifold.
6. Open fully the valve stem of the packed valves
(both sides of Gas and Liquid).
7. Remove the charging hose from the service port.
8. Securely tighten the caps on the packed valves.
[Packed valve handling precautions]
• Open the valve stem all the way out ; do not try to
open it beyond the stopper.
• Securely tighten the valve stem cap in torque as
follows:
[Hexagonal wrench is required.]
Fig. 9-7-1
Fig. 9-7-2
Compound
pressure gauge Pressure gauge
Manifold valve
Handle Hi
(Keep full closed)
Charge hose
Vacuum pump
adapter for
counter-flow
prevention
Packed valve at gas side
Service port
(Valve core (Setting pin))
Handle Lo
Charge hose
–101kPa
(–76cmHg)
Vacuum
pump
Packed valve
at liquid side
