Hitachi RAS-(3-6)HVRNM2E Service Manual page 82

3 Piping work and
refrigerant charge
• 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 using an insulation (field-supplied).
3 If the field-supplied piping is connected with stop valves directly, it is recommended to use a tube bender.
4 Check that the stop valves are closed completely before connecting 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.
A. Insulation material.
B. Field supplied.
72
SMGB0064 rev.0 - 08/2011
2
1
Tightening Torque (Nm)
20
40
60
80
3
4
5
1
A