Nortek GKU18USV4DH - Page 20

DC Inverter U-match Series Cassette Type Unit
16
Fig. 4.12
Table 4.5 Flare nut tightening torque
Pipe Diameter
Tightening Torque
6mm (1/4inch)
15~30N·m (11~22ft.-lb.)
9.5mm (3/8inch)
35~40N·m (26~29ft.-lb.)
12.7mm (1/2inch)
45~50N·m (33~37ft.-lb.)
16mm (5/8inch)
60~65N·m (44~48ft.-lb.)
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
.
Fig. 4.13
4.3.5 Checking the Pipe Connections for Gas Leaks
For both indoor and outdoor unit, be sure to check the joints for gas leaks with a