Hitachi RAS-14FSXN - Refrigerant Piping Work

Required tightening torque
Pipe size Tightening torque
ø6.35 1/4 14 ~ 18 N-m
ø9.53 3/8 34 ~ 42 N-m
ø12.7 1/2 49 ~ 61 N-m
ø15.88 5/8 68 ~ 82 N-m
ø19.05 3/4 100 ~ 120 N-m
C A U T I O N
• Do not
apply excessive force to the flare nut when tightening. If applied, the flare nut may crack due to aged
deterioration and refrigerant leakage may occur. Use the specified tightening torque.
• For more details of the refrigerant piping work, vacuum pumping and refrigerant charge, refer to Technical
Catalog for Outdoor Unit.
3.2.4 Refrigerant piping work
Provide the refrigerant pipe in the field. Make sure that the refrigerant pipe should be connected to the same refrigerant
cycle unit.
¿ Position of piping connection
1
5
8
7
6
214
376
301
301
111
B C
38 38
40
54
151 63
39
180
191
25
20
3
4
2
Unit: mm.
1 Service cover for electronic expansion valve.
2 Low pressure pas pipe ponnection (ø flare nut).
3 Service cover for electrical box.
4 High pressure gas pipe connection (ø flare nut).
5 Electrical box (available for both sides).
6 Gas pipe connection (ø flare nut).
7 Outdoor unit connecting side.
8 Indoor unit connecting side.
Model
Dimension
A B C
CH-6.0N1 ø15.88 82 89
CH-10.0N1 ø19.05 89 96
¿ Selecting piping size
A)
Select the size for the high pressure gas pipe, low pressure gas pipe and gas pipe according to the table 1. The size
depends on the indoor unit total capacity connected downstream of the CH unit.
B) In case that the piping size from Table 5.1 and the piping connection size for CH unit from Table 2 are different, use an
accessory pipe according to the item Piping connection.
C) As for the multi-kit branch or header branch, refer to Technical Catalog for Outdoor Unit.
3 Piping work and
refrigerant charge
67
SMGB0065 rev. 1 - 12/2010
3