Hitachi RAS-(4-12)HRNM(2)(E) - General Check

3 Piping work and
refrigerant charge
72
SMGB0064 rev.0 - 08/2011
• 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.
1
2
3
5
4
• 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.
1
A
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 (eld-supplied).
3 If the eld-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 eld supplied refrigerant pipes to the indoor unit and outdoor unit. Apply the oil thinly at the seat are nut
and pipe before tightening.
The required tightening torque is as follows:
Pipe Size Tightening Torque (Nm)
Ø 6.35 mm 20
Ø 9.53 mm 40
Ø 12.70 mm 60
Ø 15.88 mm 80
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.