Test Run - Hitachi RAS-3HVRNME-AF Installation And Operation Manual

REFRIGERANT PIPING &
REFRIGERANT CHARGE
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.
The required tightening torque is as follows:
Pipe Size Tightening Torque (Nm)
Ø 6.35 mm
Ø 9.53 mm
Ø 12.70 mm
Ø 15.88 mm
6. After connecting the refrigerant piping, seal the open space
between knockout hole and refrigerant pipes by using
insulation material.
Unit
Side
7. Operation of stop valve should be performed according to the
figure below.
Nº Description
Cap

Allen wrench Hex 4 mm

Refrigerant Piping Field Supplied

Cap

Refrigerant Pressure To Outdoor Unit

Seat Surface Fully closed position

Check Joint Only the charging those can be connected

Cap

O-Ring Rubber

Open – Counterclockwise
Spindle valve

Close – Clockwise
Tighten torque (N.m)
Valve type / Model A
Liquid Valve: 3~6HP 7~9
Gas Valve: 3~6HP 9~11
20
40
60
80
Nº Description
Insulation Material

Insulation Material

Field Supplied

Insulation Material

Close before shipment
Remaks
B C D
34~42 34~42 14~18
34~42 68~82 14~18
Outdoor unit stop valve
¡
Do not apply two
spanners at this
position. If applied,
leakage will occur.

CAUTION:
At the test run, fully open the spindle.
If not fully opened, the devices will be damaged.
Do not attempt to turn service valve rod beyond its stop.
Do not loosen the stop ring. If the stop ring is loosened, it is
dangerous since the spindle will hop out.
10.4. REFRIGERANT PIPING
The refrigerant piping between the indoor unit and the outdoor
unit should be designed using the following chart.
Keep the design point within the dark area of the chart, which
is showing the applicable height difference according to piping
length.
10.4.1. REFRIGERANT PIPING LENGHT
Height difference
(m)
When outdoor
unit is installed
higher than
indoor unit
When outdoor
unit is installed
lower than indo-
or unit
Setting of Pipe Length DSW.
DSW2 setting will be required only when the refrigerant
pipe length is shorter than 5 m. Pipe length setting shall be
performed as shown below.
(The  side in the table below shows the DSW location)
DSW2 on Outdoor PCB1
Factory setting
Pipe length between 5 m and 30 m
PMML0205A rev.4 - 11/2012
Stop valve
Flare nut
Total length between outdoor unit
and indoor unit.
40
Installer setting
Pipe Length 5 m or shorter
27