Hitachi UTOPIA RAS-4HVRP2E Installations- Und Betriebshandbuch Seite 41

Refrigerant piping & refrigerant charge
?
N O T E
Place insulation (field supplied) to protect cables and pipes from
being damaged by plate edges.
b. For the downward piping
Cables
Liquid piping
?
N O T E
Cables shall not contact directly to the pipes.
c. For the rear side piping
?
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 a insulation (field-supplied).
3 If the field-supplied piping is connected with stop valves
directly, it is recommended use a tube bender.
4 Check to ensure 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.
6 After connecting the refrigerant piping, seal the open space
between knockout hole and refrigerant pipes by using
insulation material.
7 Operation of stop valve should be performed according to
the figure below.
10 PMML0545 rev.2 - 04/2021
Gas piping
Knock-out hole
Bottom base
Rear Cover
Outdoor unit stop valve
Spindle Type




Closed upon factory shipping
Tightening Torque (Nm)

Liquid valve 7-9
Gas valve 9-11
Spindle Type
Nº Description
Cap

Allen wrench

Refrigerant Piping

Flare nut

Refrigerant Pressure

Seat Surface

Check Joint

Charge port cap

O-Ring

Spindle valve

Do not apply two
spanners at this
position. If applied,
leakage will occur.
Spindle valve
Flare nut
Cap
Check joint for service port
  
33-42 33-42
14-18
68-82 50-62
Remarks
Liquid valve: Hex 4 mm /
Gas valve: Hex 5 mm
Field Supplied
To Outdoor Unit
Fully closed position
Only the charging hose can be
connected
Rubber
Open – Counterclockwise
Close – Clockwise
Stop valve
(Spindle type)
Flare nut