En-14
• Weld the flange joint, joint pipe, and the main piping.
* Apply nitrogen gas while welding the pipes.
• Tighten the flares of the connection pipes on the valves (3-way valve: oil, gas, and liquid pipes) of the outdoor unit.
Refer to Table 4.7-2 for the tightening torque values.
* For an single unit installation, do not connect the oil pipe.
• Make sure to use 2 spanners to tighten the flare nut (Fig. 4.7-5).
• Refer to Figs. 4.7-6, 7, and 8 before connecting the connection pipes to the outdoor unit.
• Use the gasket (accessory) to connect the flange joint.
Do not use the gasket that comes with the product.
• Braze the joint pipe (accessory) to the flange joint assembly (accessory).
• Cut the joint pipe (accessory) appropriately in order to extend them from the front, side, and back of the unit.
Fig. 4.7-5 Fig. 4.7-6
Gas valve
Oil valve
Liquid valve
Flare nut
Liquid pipe
Washer
Flange joint
assembly
Gasket
(Accessory)
Fig. 4.7-7 Front piping
Liquid pipe
(Field supply)
To indoor unit
Joint pipe
(Accessory)
Flange joint
assembly
Knockout
hole
Connection pipe
Torque
wrench
Indoor unit pipe
(Body side)
Flare nut
Wrench (Fixed)
Tighten with two wrenches.
4.7.5. PIPE CONNECTIONS
CAUTION
• Seal the pipe routing holes with putty (supplied locally) so that there will be no gap.
If small animals such as insects enter the outdoor unit, they can cause a short circuit in the electrical box.
• To prevent pipes from breaking, do not make sharp bends on them.
The pipes may be bended with a curvature radius of 70 mm or more.
• A pipe is likely to break if it is bent many times at the same place.
• Do not make a flare connection on an indoor unit pipe until the connection pipes are connected.
• When connecting the pipe, keep it at the right angle so that the flare can be attached correctly to the 3-way valve.
If the flare is not properly centered, the flare nut will not tighten smoothly.
The thread may become damaged if you attempt to tighten the flare nut with excessive force.
• To weld the flange joint with the gas pipe, do so with the flange joint detached from the 3-way valve. Welding
the flange joint with the 3-way valve attached will cause the 3-way valve to malfunction.
Fig. 4.7-8 Bottom piping
Gas pipe (3-way valve)
Liquid pipe (3-way valve)
Oil pipe (3-way valve)
Flare nut
—
49.0 to 61.0 N·m
(490 to 610 kgf·cm)
16.0 to 18.0 N·m
(160 to 180 kgf·cm)
Bolt of Flange joint
34.3 to 39.2 N·m
(350 to 400 kgf·cm)
—
—
Table 4.7-2
Flange joint
assembly
Knockout
hole
Joint pipe
(Accessory)
Oil pipe
Bolt
Gas pipe (Field supply)
9374241033_IM_en_p01-17.p65 26/8/2008, 18:2314
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