Hitachi RAS-3-HVNC - Rear Cover

3. Piping work and refrigerant charge
59
SMGB0079 rev.0 - 01/2013
3

For the rear side piping
After removing the rear-side piping cover, punch out the “A” holes along the guide line.
Rear Cover
N O T E
Removetherearpipecoverundertherearcoverandremove 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 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 to ensure that the stop valves are completely closed 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 (1/4) 20
Ø 9.52 mm (3/8) 40
Ø 12.70 mm (1/2) 60
Ø 15.88 mm (5/8) 80
Ø 19.05 mm (3/4) 100
6 After connecting the refrigerant piping, seal the open space between knockout hole and refrigerant pipes by using
insulation material.
Unit Side
Nº Description

Insulation Material

Insulation Material

Field Supplied

Insulation Material
7 Operation of stop valve should be performed according to the Outdoor unit stop valve explanation.