<Packed valve handling precautions>
Fig. 10-4-
8
•
Open the valve stem all the way out, but do not try
to open it beyond the stopper.
Cap
Torque
Pipe size of Packed Valve
Size of Hexagon wrench
12.70 mm and smallers
A = 4 mm
15.88 mm
A = 5 mm
•
Securely tighten the valve cap with torque in the
following table
Cap Size (H)
Valve Rod
Cap
Service
Port Cap
H17 - H19
H22 - H30
H14
H17
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
Hexagon wrench
is required.
Service Port Cap
Valve Rod Cap
CAUTION
•
KEEP IMPORTANT
6
POINTS FOR PIPING WORK
1) Take away dust and moisture (inside of the
connecting pipes).
2) Tighten the connections (between pipes and
unit).
3) Evacuate the air in the connecting pipes using a
VACUUM PUMP.
4) Check gas leak (connected points).
5) Be sure to fully open the packed valves before
operation.
6) Reusable mechanical connectors and flared
joints are not allowed indoors. When
mechanical connectors are reused indoors,
sealing parts shall be renewed. When flared
joints are reused indoors, the fl are part shall be
refabricated.
AIR PURGE
acuate the air in the connecting pipes and in the
Ev
indoor unit using a v
refriger
acuum pump. Do not use the
ant in the outdoor unit. For details, see the
manual of the vacuum pump.
<Using 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. (If oil inside of the vacuum
pump
enters into the air conditioner, which use R
32
,
refrigeration cycle trouble may result.)
1. Connect the charge hose from the manif
e to
old valv
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 start 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 kP a (76 cmHg).
5.
6.
Close the low pressure side valve handle of gauge
manifold.
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.
Fig.
10-4-
7
Pressure gauge
Manifold valve
–101 kPa (-76 cmHg)
Handle Lo
Connecting pipe
Compound pressure gauge
Vacuum
pump
Handle Hi (Keep full closed)
Charge hose (For R
32
only)
Vacuum pump adapter for
counter-flow prevention
(For R
32
only)
Packed valve at gas side
Service port (Valve core (Setting pin))
Packed valve at liquid side
Charge hose (For R
32
only)
FILE NO. SVM-18006
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