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9-8. EVACUATING
AIR PURGE
Evacuate the air in the connecting pipe 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.
9-8-1. 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 pipe of the air conditioner 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 30 meters for model SM560
and 50 meters for model SM800.
(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.
Valve handling precautions
• Open the valve stem or the handle until it strikes
the stopper. It is unnecessary to apply further
force.
• Securely tighten the cap with a torque wrench.
Cap tightening torque
∅6.4 14 to 18 N•m (1.4 to 1.8 kgf•m)
Valve size
∅9.5 33 to 42 N•m (3.3 to 4.2 kgf•m)
∅12.7 33 to 42 N•m (3.3 to 4.2 kgf•m)
∅15.9 20 to 25 N•m (2.0 to 2.5 kgf•m)
Charge port 14 to 18 N•m (1.4 to 1.8 kgf•m)
9-8-2. Additional refrigerant
1. The amount of refrigerant put into the outdoor unit
at the factory is sufficient to fill up to 20 m of
refrigerant piping work.
2. If the length of the refrigerant piping work is 20 m or
less, addition of refrigerant at the installation site is
unnecessary.
3. If the length of the piping work exceeds 20 m, extra
refrigerant must be added. Refer to the outdoor
installation manual for details of the extra amounts.
4. Overcharge or undercharge of refrigerant in the
outdoor unit may cause malfunction of the
compressor.
Add Only R410A Refrigerant to These Units
NOTE :
• Use the vacuum pump, vacuum pump adapters, and
gauge manifold referring to the manuals attached to
each tool before using them.
For the vacuum pump, check oil is filled up to the
specified line of the oil gauge.
• While the air is purged, check again that the
connecting port of charge hose, which has a
projection to push the valve core, is firmly connected
to the charge port.