Hitachi UTOPIA ES Serie Bedienungsanleitung Seite 21

REFRIGERANT PIPING & REFRIGERANT CHARGE
b. For the downward piping
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.
11 PMML0396B rev.0 - 11/2015
Cables
Gas piping
Knock-out hole
Bottom base
Rear Cover
Nº Description
Cap

Allen wrench

Refrigerant Piping

Flare nut

Refrigerant Pressure

Seat Surface

Check Joint

Cap

O-Ring

Spindle valve

Closed upon factory shipping
Tightening Torque (Nm)
Valve type
Fig.A Liquid valve
Fig.B Gas valve
Do not apply two
spanners at this
position. If applied,
leakage will occur.
Use two spanners
here for pipe
connection
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.
• 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.
• 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 leakage
occurs, it will cause difficulty with breathing or harmful gases would
occur if a fire was being used in the room.
Remarks
Fig.A: Hex 4 mm / Fig.B: Hex. 8 mm
Field Supplied
To Outdoor Unit
Fully closed position
Only the charging those can be
connected
Rubber
Open – Counterclockwise
Close – Clockwise
A B C
40 40 16
100 45 9
Stop valve
Flare nut
Don not apply two
spanners work
here
Position to apply
spanners
Ball type
D
8
13