– 34 –
FILE NO. SVM-01010
• Tightening torque of flare pipe connections
Flare nut
Half union
Use a wrench to secure. Use a torque wrench to tighten.
Externally
threaded side
Internally
threaded side
Flare at indoor
unit side
Flare at outdoor
unit side
Fig. 8-5-4
Fig. 8-5-5
8-5-3. Evacuating
After the piping has been connected to the indoor unit,
you can perform the air purge together at once.
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 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 15 minutes if the
piping length is 20 meters. (15 minutes for 20
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
side of Gas and Liquid).
7. Remove the charging hose from the service port.
8. Securely tighten the caps on the packed valves.
Pressure gauge
Manifold valve
Charge hose
-101kPa (-76cmHg)
Handle Lo
Connecting pipe
Packed valve at gas side
Compound pressure gauge
Vacuum pump
adapter for
counter-flow
prevention
Service port (Valve core (Setting pin))
Vacuum
pump
Packed valve at liquid side
Handle Hi
(Keep full closed)
Charge hose
Fig. 8-5-6
CAUTION
• KEEP IMPORTANT 4 POINTS FOR PIPING
WORK
(1) Take away dust and moisture (Inside of the
connecting pipes.)
(2) Tight connection (between pipes and unit)
(3) Evacuate the air in the connecting pipes using
VACUUM PUMP.
(4) Check gas leak (connected points)
Outer dia.
of copper pipe
∅6.35 mm
∅12.70 mm
∅15.88 mm
Tightening torque
16 to 18 (1.6 to 1.8 kgf·m)
50 to 62 (5.0 to 6.2 kgf·m)
65 to 80 (6.5 to 8.0 kgf·m)
(Unit : N·m)
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