Toshiba RAS-25S4KVDG-ND Service Manual page 87

CAUTION
• KEEP IMPORTANT 7 POINTS FOR PIPING WORK
Take away dust and moisture (inside of the
(1)
connecting pipes).
Tighten the connections (between pipes and unit).
(2)
Evacuate the air in the connecting pipes using a
(3)
VACUUM PUMP.
Check gas leak (connected points).
(4)
Be sure to fully open the packed valves before
(5)
operation.
Reusable mechanical connectors and flared joints
(6)
are not allowed indoors. When mechanical
connectors are reused indoors, sealing parts shall
be renewed. When flared joints are reused
indoors, the flare part shall be refabricated.
Don't operate air conditioner in case no
(7)
refrigerant in the system.
<Packed valve handling precautions>
• Open the valve stem all the way out, but do not try
to open it beyond the stopper.
Pipe size of Packed Valve
12.70 mm and smallers
15.88 mm
<Pump down process>
1. Turn off the Air Conditioner system.
2. Connect the charge hose from the manifold valve to the
service port of the packed valve at gas side.
3. Turn on the Air Conditioner system in cooling operation
more than 10 minutes.
4. Check the operating pressure of the system should be
normal value. (Ref. with product specification)
5. Release the valve rod cap of both service valves.
6. Use the Hexagon wrench to turning the valve rod of
Liquid side fully close.
(*Make sure no entering air into the system)
7. Continue operate Air Conditioner system until the gauge
of manifold dropped into the range of 0.5 - 0 kgf/cm
8. Use the Hexagon wrench to turning the valve rod of Gas
side fully close. And turn off the Air Conditioner system
immediately thereafter.
9. Remove the gauge manifold from the service port of the
packed valve.
10. Securely tighten the valve rod cap to the both service
valves.
CAUTION
Should be check the compressor operating condition
while pumping down process. It must not any abnormal
sound, more vibration. It is abnormal condition
appears and must turn off the Air Conditioner
immediately.
Size of Hexagon wrench
A = 4 mm
A = 5 mm
2
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• Securely tighten the valve cap with torque in the
following table
Cap Cap Size (H)
H17 - H19
Valve Rod
Cap
H22 - H30
H14
Service
Port Cap
H17
Hexagon wrench
is required.
Service Port Cap
Valve Rod Cap
Fig. 10-4-10
Torque
14~18 N.m
(1.4 to 1.8 kgf·m)
33~42 N.m
(3.3 to 4.2 kgf·m)
8~12 N.m
(0.8 to 1.2 kgf·m)
14~18 N.m
(1.4 to 1.8 kgf·m)
A
H