Hitachi RAS-10HNCE, Installation And Operation Manual

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PMML0251A rev.2 - 02/2013
Refrigerant piping & refrigerant charge
25
ENGLISH
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 di-
rectly, 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 (1/4) 20
Ø 9.53 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 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
figure below.
Close before shipment
Outdoor unit stop valve
Spindle Type Ball Type
Liquid
RAS-(4-10)H(V)NPE
RAS-(8/10)HNCE
Liquid and Gas
RAS-3HVNPE
RAS-(4-6)H(V)NCE
Gas
RAS-(4-10)H(V)NPE
RAS-(8/10)HNCE
(a)

Spindle valve
 Flare nut

Cap
 Check joint for service port
Tightening Torque (Nm)
   
Liquid valve 7-9
40
10HP: 60
33-42
14-18
Gas valve 9-11
80
8/10HP: 100
3HP: 33-42
4/5/6HP:
P=20-25
C=33-42
8/10HP:20-25
Spindle Type Ball Type
(a) (b)
Nº Description Remarks

Cap

Allen wrench Hex 4 mm

Refrigerant Piping Field Supplied

Flare nut

Refrigerant Pressure To Outdoor Unit

Seat Surface Fully closed position

Check Joint Only the charging those can be connected

Charge port cap

O-Ring Rubber

Spindle valve
Open – Counterclockwise
Close – Clockwise
«
Shaft
¬
Pin

Stopper
(a)
Closed
This valve is opened or closed with rotating 90
degrees at the ball valve part. Rotate the shaft
until the pin touches the stopper. Do not apply the
extra force. Use a slotted screwdriver to control
the shaft. Do not leave the ball valve partly ope
n
(b)
Opened
Do not apply two spanners
at this position. If applied,
leakage will occur.
Stop valve
(Spindle type)
Flare nut
Use two spanners
here for pipe con-
nection
Do not work with
two spanners
here.
Refrigerant
leakage shall
occur
Position to apply
spanners
Don not apply
two spanners
work here
Spindle type Ball type
C A U T I O N
At the test run, fully open the spindle and ball stop valve.
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 dan-
gerous since the spindle will hop out.
An excess or a shortage of refrigerant is the main cause of trouble
to the units. Charge the correct refrigerant quantity according to
the description of label at the inside of service cover.
Check for refrigerant leakage in detail. If a large refrigerant leak-
age occurs, it will cause difficulty with breathing or harmful gases
would occur if a fire was being used in the room.
_PMML0251A_r2.indb 25 06/02/2013 9:05:03