Hitachi RAS-(3-6)HVRNM2E Service Manual page 72

3 Piping work and
refrigerant charge
To use racking or conduit tubes, check the size and remove the stiped parts, following the slit.
N O T E
Place insulation (field supplied) to protect cables and pipes from being damaged by plate edges.
• For the downward piping
1. Liquid piping.
2. Wiring.
3. Gas piping.
4. Knock-out hole.
5. Bottom base.
N O T E
The wiring must not be in contact directly with the pipes.
• For the rear side piping
1. Rear cover.
N O T E
Remove the rear pipe cover under the rear cover and remove
the stipped part following the slit.
2 Mount the piping cover in order to avoid water entering into the
unit. Seal the holes where pipes and wires are inserted, by us-
ing an insulation (field-supplied).
3 If the field-supplied piping is connected with stop valves di-
rectly, it is recommended to use a tube bender.
4 Check that the stop valves are closed completely before con-
necting pipes.
5 Connect the field supplied refrigerant pipes to the indoor unit
and outdoor unit. Apply the oil thinly at the seat flare nut and
pipe before tightening.
The required tightening torque is as follows:
Pipe Size
Ø 6.35 mm
Ø 9.53 mm
Ø 12.70 mm
Ø 15.88 mm
6 After connecting the refrigerant piping, seal the open space between knockout hole and refrigerant pipes by using the
insulation material.
62
SMGB0064 rev.0 - 08/2011
2
1
Tightening Torque (Nm)
20
40
60
80
3
4
5
1
A