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G An excess or a shortage of refrigerant is the
main cause of trouble to the units.
Charge the correct refrigerant quantity as
shown in the item 5.4 and the item 5.5.
G Check for refrigerant leakage in detail. If a
large refrigerant leakage occurs, it will
cause difficulty with breathing or harmful
gases would occur if a fire was being used
in the room.
• Insulate the refrigerant pipes as shown in
Fig. 5.4
Stop Valve
Insulation
(Field-Supplied)
Refrigerant Piping
(Field-Supplied)
Fig. 5.4 Insulation on Pipes
After connecting the refrigerant piping, seal the
refrigerant pipes by using the field-supplied
insulation material. Insulate the unions and flare-
nuts at the piping connections completely.
Insulate the liquid piping and gas piping
completely to avoid decreasing of performance
and dewing on the surface of the pipe.
G Cap the end of the pipe when the pipe is to
be inserted through a hole.
G Do not put pipes on the ground directly
without a cap or vinyl tape at the end of the
pipe.
Do not place the pipe
directly on the ground.
Correct
Attach a cap
or vinyl tape.
10
Incorrect
5.3
Stop Valve
Operation of the stop valve should be performed
according to the following Table 5.4.
Hexagonal Wrench
Ref. Pressure
To open or close
spindle valve
Spindle Valve
.....Open
Counterclockwise
Clockwise
.....Close
Closed before
shipment.
Check Joint
Only the charging hose
can be connected.
Tighten the cap with a
torque of 9.8N m
Table 5.4 Stop Valve
Hexagonal Wrench Size (mm)
Liquid Valve
10
G Do not apply an abnormal big force to
the spindle valve at the end of opening
(5.0N-m or smaller).
The back seat construction is not provided.
G Do not loosen the stop ring. If the stop ring
is loosened, it is dangerous, since the
spindle will hop out.
G At the test run, fully open the spindle.
If not fully opened, the devices will be
damaged.
Cap
Tighten the cap with
a torque below.
(Attach this after work)
(N
m)
G
Liquid
Gas
44.1
58.8
O-Ring
(Rubber)
Refrigerant Piping
Gas Valve
10
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