Evacuating - Toshiba RAS-M10SMUV-E Installations-Handbuch

7 EVACUATING

EVACUATION
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 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 until it touches the stopper. Once it is in contact with the stopper, refrain from applying any more force than is
necessary.
• Securely tighten the valve stem cap in torque as follows:
Gas side
(12.7 mm (diam.))
Gas side
(9.5 mm (diam.))
Liquid side
(6.4 mm (diam.))
Service port
Compound pressure gauge
–101 kPa
(–76 cmHg)
Handle Lo
Charge hose
Packed valve
at liquid side
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)
Pressure gauge
Manifold valve
Handle Hi
(Keep full closed)
Charge hose
Vacuum pump adapter for
counter-flow prevention
Vacuum
pump
Service port
(Valve core (Setting pin))
Packed valve at gas side
Hexagon wrench is required.
17 EN