Toshiba RAV-GM802ATW-E Installation Manual page 16

■ Optional Installation parts
(Locally procured)
Parts name
Refrigerant piping
A Liquid side: Dia.9.5 mm
Gas side: Dia.15.9 mm
Pipe insulating material
B
(polyethylene foam, 10 mm thick)
C Putty, PVC tape
■ Refrigerant piping connection
CAUTION
Take note of these 4 important points below for
piping work
1. Keep dust and moisture away from inside the
connecting pipes.
2. Tightly connect the connection between pipes
and the unit.
3. Evacuate the air in the connecting pipes using a
VACUUM PUMP.
4. Check for gas leaks at connection points
Piping connection
Liquid side
Outer diameter Thickness
9.5 mm 0.8 mm
Gas side
Outer diameter Thickness
15.9 mm 1.0 mm
29-EN
Flaring
1. Cut the pipe with a pipe cutter.
Be sure to remove burrs that may cause a gas leak.
2. Insert a flare nut into the pipe, and then flare the
pipe.
Q'ty
Use the flare nuts supplied with the air conditioner or
those for R32.
However, conventional tools can be used by
One each
adjusting the projection margin of the copper pipe.
1
Projection margin in flaring: B (Unit: mm)
One each
Rigid (Clutch type)
Outer dia. of R32 or R410A tool
used
copper pipe
6.4
9.5
0 to 0.5
12.7
15.9
Flaring diameter size: A (Unit: mm)
A
Outer dia. of copper pipe
6.4
9.5
12.7
15.9
CAUTION
• Do not scratch the inner surface of the flared part
when removing burrs.
• Flare processing under the condition of scratches on
the inner surface of flare processing part will cause
refrigerant gas leak.
• Check that the flared part is not scratched, deformed,
stepped, or flattened, and that there are no chips
adhered or other problems, after flare processing.
• Do not apply refrigerating machine oil to the flare
surface.
– 15 –
■ Tightening of connecting part
1. Align the centers of the connecting pipes and fully
tighten the flare nut with your fingers. Then fix the
nut with a wrench as shown in the figure and tighten
it with a torque wrench.
2. As shown in the figure, be sure to use two wrenches
to loosen or tighten the flare nut of the valve on
the gas side. If you use a single crescent wrench,
the flare nut cannot be tightened to the required
tightening torque.
On the other hand, use a single crescent wrench to
B
loosen or tighten the flare nut of the valve on the
liquid side.
Outer dia. of copper pipe
6.4 mm
9.5 mm
Conventional tool
used
12.7 mm
15.9 mm
1.0 to 1.5
<GM80, GM90>
Wrench for
fixing
A +
0
–0.4
Cap
9.1
13.2
16.6
19.7
CAUTION
• Do not put the crescent wrench on the cap.
The valve may break.
• If applying excessive torque, the nut may break
according to some installation conditions.
Incorrect
<GM110, GM140, GM160>
Valve at gas side
CAUTION
(Unit: N•m)
Tightening torque
14 to 18
33 to 42
50 to 62
68 to 82
Flare nut
• After the installation work, be sure to check for gas
leaks of the pipe connections with nitrogen.
Wrench for work
Therefore, using a torque wrench, tighten the flare
pipe connecting sections that connect the indoor/
outdoor units at the specified tightening torque.
Loosened
Incomplete connections may cause not only a gas
leak, but also trouble with the refrigeration cycle.
Do not apply refrigerating machine oil to the
flared surface.
Tightened
Valve at gas side
Use of single wrench is
prohibited
Flare nut
Tightened
Loosened
Incorrect
Charge port
Cap
30-EN