14
EN
After the piping has been connected to the indoor unit, perform the air purge.
Use a vacuum pump
Be sure to use a vacuum pump with counter-flow prevention function so that oil inside the pump does not flow back into the air
conditioner pipes when the pump stops. (If oil inside the vacuum pump enters the air conditioner circuit which uses R410A, trouble
with the refrigeration system may develop.)
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 the vacuum pump.
3.
Open fully the low pressure side handle of the gauge manifold valve.
4.
Operate the vacuum pump to begin evacuating. Perform evacuating for about 15 minutes if the piping length is 20 meters (15
minutes for 20 meters) (assuming a pump capacity of 27 liters per minute). Confirm that the compound pressure gauge reading is
–101 kPa (–76 cmHg).
5.
Close the low pressure 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.
Evacuating
AIR PURGE
Evacuate the air in the connecting pipes and in the indoor unit using a vacuum pump. Do not use the refrigerant in the outdoor unit.
For details, see the vacuum pump manual.
CAUTION
• IMPORTANT POINTS FOR PIPING WORK
(1) Prevent dust and moisture from entering the pipes.
(2) Tighten connections carefully (between pipes and unit).
(3) Evacuate the air in the connecting pipes using a VACUUM PUMP.
(4) Check for gas leaks at all connections.
Compound pressure gauge
–101 kPa
(–76 cmHg)
Handle Lo
Charge hose
(For R410A only)
Pressure gauge
Manifold valve
Handle Hi
(Keep full closed)
Charge hose
(For R410A only)
Connecting
pipe
Vacuum pump adapter for counter-
flow prevention (For R410A only)
Vacuum
pump
Packed valve at liquid side
Packed valve at gas side
Service port
(Valve core (Setting pin))
01_Installation_EN.fm Page 14 Tuesday, December 26, 2006 4:36 PM
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