Hitachi UTOPIA IVX PREMIUM Series Installations- Und Betriebshandbuch Seite 25

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 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
Ø 6.35 mm (1/4)
Ø 9.53 mm (3/8)
Ø 12.70 mm (1/2)
Ø 15.88 mm (5/8)
Ø 19.05 mm (3/4)
6 After connecting the refrigerant piping, seal the open space
between knockout hole and refrigerant pipes by using insula-
tion material.
Unit
Side
7 Operation of stop valve should be performed according to the
figure below.
Close before shipment
Outdoor unit stop valve
Spindle Type
Liquid
RAS-(4-10)H(V)NPE
RAS-(8/10)HNCE
Liquid and Gas
RAS-3HVNPE
RAS-(4-6)H(V)NCE




Tightening Torque (Nm)

Liquid valve 7-9
Gas valve 9-11
25
_PMML0251A_r2.indb 25
Tightening Torque (Nm)
20
40
60
80
100
Nº Description
Insulation Material

Insulation Material

Field Supplied

Insulation Material

Ball Type
Gas
RAS-(4-10)H(V)NPE
RAS-(8/10)HNCE
(a)
Spindle valve
Flare nut
Cap
Check joint for service port
 
40
33-42
10HP: 60
3HP: 33-42
4/5/6HP:
80
P=20-25
8/10HP: 100
C=33-42
8/10HP:20-25
PMML0251A rev.2 - 02/2013
Spindle Type
Nº Description
Cap

Allen wrench

Refrigerant Piping

Flare nut

Refrigerant Pressure

Seat Surface

Check Joint

Charge port cap

O-Ring

Spindle valve

Shaft
«
Pin
¬
Stopper

(a)
Closed
(b)
Opened
Do not apply two spanners
at this position. If applied,
leakage will occur.
Use two spanners
here for pipe con-
nection
Do not work with
two spanners
here.
Refrigerant
leakage shall
occur
Spindle 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
14-18
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.
Ball Type
(a)
Remarks
Hex 4 mm
Field Supplied
To Outdoor Unit
Fully closed position
Only the charging those can be connected
Rubber
Open – Counterclockwise
Close – Clockwise
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
Stop valve
(Spindle type)
Flare nut
Don not apply
two spanners
work here
Position to apply
spanners
Ball type
06/02/2013 9:05:03
(b)
n