Hitachi RAS-H(V)RNME-AF Service Manual page 75

3 Piping work and
refrigerant charge
• Dimensions of the flared pipe
Units: mm (inch)
Nominal External
A
diameter diameter
(1/4) 6.35
(3/8) 9.53
(1/2) 12.7
(5/8) 15.88
• Thickness of the copper pipes
Units: mm (inch)
Nominal External
Thickness
diameter diameter
(1/4) 6.35
(3/8) 9.53
(1/2) 12.7
(5/8) 15.88
• Dimensions of the flare nut
Units: mm (inch)
Nominal External
diameter diameter
(1/4) 6.35
(3/8) 9.53
(1/2) 12.7
(5/8) 15.88
• Flare nuts tightening torque
Always use two wrenches or fix spanners when tightening the Flare Nuts on the refrigerent pipes.
If any failure occurs during this process the result could be pipe damage or refrigerant leak.
Unit: N.m
Pipe size Tightening torque
Ø 6.35 mm 20
Ø 9.53 mm 40
Ø 12.7 mm 60
Ø 15.88 mm 80
65
SMGB0070 rev.1 - 08/2011
Ø +0/-0.4
9.1
13.2
16.6
19.7
0.80
0.80
0.80
1.00
B
17
22
26
29
3