DC Inverter U-match Series Duct Type Unit
14
When the flare nut is tightened properly by your hand, use a torque wrench to finally tighten it.
Fig.16
Fig.17
Table 7 Flare nut tightening torque
Pipe Diameter
Tightening Torque
1/4˝(Inch)
15-30 (N·m)
3/8˝(Inch)
35-40 (N·m)
5/8˝(Inch)
60-65 (N·m)
1/2˝(Inch)
45-50 (N·m)
3/4˝(Inch)
70-75 (N·m)
7/8˝(Inch)
80-85 (N·m)
CAUTION!
Be sure to connect the gas pipe after connecting the liquid pipe completely.
4.3.4 Connecting the Pipe at the Outdoor Side Unit
Tighten the flare nut of the connection pipe at the outdoor unit
valve connector. The tightening method is the same as that as at the
indoor side.
4.3.5 Checking the Pipe Connections for Gas Leaking
For both indoor and outdoor unit side, check the joints for gas
leaking by the use of a gas leakage detector without fail when the
pipes are connected.
4.3.6 Heat Insulation on the Pipe Joints (Indoor Side Only)
Stick coupler heat insulation (large and small) to the place where connecting pipes.
Fig.18
