Hitachi RAS-(2-6)HVNP1(E), Руководство по обслуживанию

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3 Piping work and
refrigerant charge
69
SMGB0087 rev.0 - 12/2013
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 (field-supplied).
3 If the field-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 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 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 “3.2.3 Outdoor unit stop valve” explanation.