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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 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 evacuating.
Perform evacuating for about 35 minutes if the
piping length is 30 meters total 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.
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 at the torque as
follows:
15.9 mm (diam.)
12.7 mm (diam.)
9.52 mm (diam.)
6.35 mm (diam.)
63 to 77 N•m (6.3 to 7.7 kgf•m)
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)
Hexagonal wrench is required.
<For RAV-SM800AT-E model>
• As shown in the figure, be sure to use a double
spanner to loosen or tighten the flare nut of the valve
at gas side. If using a single spanner, the nut cannot
be tightened with necessary tightening torque.
On the contrary, use a single spanner to loosen or
tighten the flare nut of the valve at liquid side.
Cap
Loosened
SM800 type valve at gas side
Compound
pressure gauge Pressure gauge
–101kPa
(–76cmHg)
Handle Lo
Charge hose
Packed valve
at liquid side
14
Cover
Piping valve
Tightened
Flare nut
Cover
Do not put the spanner or
torque wrench, etc. on
the cover.
The valve may be broken.
Manifold valve
Handle Hi
(Keep fully closed)
Charge hose
Vacuum pump
adapter for
counter-flow
prevention
Vacuum
pump
Service port
(Valve core (Setting pin))
Packed valve at gas side
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