Hitachi RAS-3HVRNS3 - 14.2 PIPING CONNECTION FOR OUTDOOR UNIT; 14.2.1 Outdoor unit stop valve

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PMML0318A - P5415337
Refrigerant piping & refrigerant charge
14.2 PIPING CONNECTION FOR OUTDOOR UNIT
1 Take the piping cover away from the unit. Then fetch the pipes
through the rear side and route piping according to the ins-
tallation place as shown in the gure. Make holes by cutting
along the guideline at the rear of the cover or punching with
a driver. Remove the burr with a cutter, and place a insulation
(eld supplied) to protect cables and pipes.
Pipe cover
Rear side
piping
Stop valve
Direction to remove pipe cover
Connec
-
ting piping
2 Attach the pipe cover in order to prevent rainwater from ente-
ring inside the cabinet.
3 Use a pipe bender for pipe bending work when connecting
pipes.
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) 14-18
Ø 9.52 mm (3/8) 34-42
Ø 12.70 mm (1/2) 49-61
Ø 15.88 mm (5/8) 68-82
Ø 19.05 mm (3/4) 100-120
Use two spanners
here for pipe con-
nection
Do not work with
two spanners
here.
Refrigerant
leakage shall
occur
6 After connecting the refrigerant piping, seal the open space
between knockout hole and refrigerant pipes by using insula-
tion material.
Unit
Side
Nº Description

Insulation Material

Insulation Material

Field Supplied

Insulation Material
7 Operation of stop valve should be performed according to the
gure below.
8 Close before shipment
14.2.1 Outdoor unit stop valve
Operation of stop valve should be performed according to the
gures and tables below:
Spindle Type
Stop valve (liquid)
Stop valve (gas)
 Spindle valve
 Flare nut
 Cap
 Check joint for service port
Outdoor unit
Tightening Torque (Nm)
   
Gas
valve
Liquid
valve
Gas
valve
Liquid
valve
Gas
valve
Liquid
valve
Gas
valve
Liquid
valve
RAS-(2-2.5)HVNP1 7-9 7-9 34-42 34-42 33-42 33-42 14-18 14-18
RAS-3HVNC1 9-11 7-9 68-82 34-42 33-42 33-42 14-18 14-18
RAS-3HVRNS3 9-11 7-9 68-82 34-42 33-42 33-42 14-18 14-18
Refrigerant
pressure
Closed before shipment
Refrigerant piping
Hexagonal wrench
(eld supplied) (*)
Spindle valve
Tighten the spindle with a torque above:
Counterclockwise…. Open
Clockwise …. Close
Check joint
(Only charging hose can
be connected)
Tighten the cap with 16 N.m torque.
Cap
Tighten the cap with 37 N.m torque
(Attach this after work)
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