Toshiba RAS-10JAVP-E, Руководство по обслуживанию

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2. Insert a flare nut into the pipe, and flare the pipe.
• Projection margin in flaring : A (Unit : mm)
Rigid (Clutch type)
Imperial (Wing nut type)
Outer dia. of
copper pipe
6.35
9.52
Outer dia. of
copper pipe
6.35
9.52 Die Pipe
A
Half union
Flare nut
Externally
threaded side Internally
threaded side
Use a wrench
to secure. Use a torque wrench
to secure.
R410A
tool used
0 to 0.5
0 to 0.5
Conventional
tool used
1.0 to 1.5
1.0 to 1.5
R410A
1.5 to 2.0
1.5 to 2.0
Fig. 9-3-3
Tightening Connection
Align the centers of the connecting pipes and tighten
the flare nut as far as possible with your fingers. Then
tighten the nut with a spanner and torque wrench as
shown in the figure.
Outer dia. of copper pipe
Ø6.35 mm
Ø9.52 mm
Fig. 9-3-4
CAUTION
• Do not apply excess torque. Otherwise the nut
may crack depending on the conditions.
(Unit : N·m)
Tightening torque
14 to 18 (1.4 to 1.8 kgf•m)
33 to 42 (3.3 to 4.2 kgf•m)
• Tightening torque for connection of flare pipe
The pressure of R410A ishigher than R22.
(Approx. 1.6 times) Therefore
securely tighten the flare pipes
which connect the outdoor unit
and the indoor unit with the
specified tightening torque using
a torque wrench.
If each flare pipe connects
incorrectly, it may cause not only
a gas leakage but also a trouble
of the refrigeration cycle.
Flare at
indoor
unit side
Flare at
outdoor
unit side
Fig. 9-3-6
Shaping pipes
1. How to shape the pipes
Shape the pipes along the incused line on the
outdoor unit.
2. How to fit position of the
pipes
Put the edges of the pipes
to the place with a
distance of 85mm from
the incused line.
Incused
line
85mm
9-3-3. Evacuating
After the piping has been connected to the indoor unit,
you can perform the air purge together at once.
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 oil inside the pump does
not flow back into the air conditioner pipes when the
pump stops. (If oil inside the vacuum pump enters into
the air conditioner circuit which uses R410A, trouble
with the refrigeration system may develop.)
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 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 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 side
of Gas and Liquid).
7. Remove the
charging hose from
the service port.
8. Securely tighten
the caps on the
packed valves.
Compound
pressure
gauge
Pressure gauge
Manifold valve
Handle Hi
(Keep full closed)
Charge hose
(For R410A only)
Vacuum pump
adapter for
counter-flow
prevention
(For R410A only)
Packed valve at liquid side
Packed valve at gas side
Service port
(Valve core (Setting pin))
Connecting
pipe
Handle Lo
Charge hose
(For R410A only)
-101kPa
(-76cmHg)
Vacuum
pump
Fig. 9-3-7
CAUTION
•
IMPORTANT POINTS FOR PIPING WORK
1. Keep dust and moisture from entering the pipes.
2. Tight connection (between pipes and unit)
3. Evacuate the air in the connecting pipes using
VACUUM PUMP.
4. Check gas leak (connected points)
Packed Valve Handling Precautions
• Open the valve stem all the way out :
but do not try to open it beyond the stopper.
• Securely tighten the valve stem cap with torque in
the following table :
4mm
Gas side
(Ø9.52 mm)
Liquid side
(Ø6.35 mm)
Service port
Hexagonal
wrench is
required.
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)
Fig. 9-3-8
Fig. 9-3-5