Hitachi YUTAKI RWM-2R1E User Manual

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 (eld-supplied).
3 If the eld-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 eld supplied refrigerant pipes to the indoor unit and outdoor unit. Apply the oil thinly at the seat are 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 gure below.
Outdoor unit stop valve
Spindle Type Ball Type
Liquid Gas
(a)

Spindle valve

Flare nut

Cap

Check joint for service port
(a) 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 open.
Closed upon factory shipping
Tightening Torque (N·m)
   
Liquid valve 7-9
40
10HP: 60
33-42
14-18
Gas valve 9-11
80
8/10HP: 100
(4-10)HP: 20-25
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
connection.
Do not work with
two spanners
here.
Refrigerant
leakage shall
occur.
Position to apply
spanners.
Do not apply two
spanners work here.
Spindle type Ball type
! CAUTION
• 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 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 difculty with breathing or harmful gases would occur if a
re was being used in the room.
REFRIGERANT AND WATER PIPING
PMML0575 rev.2 - 03/2022
48

Hitachi YUTAKI RWM-2R1E Specifications

General

Brand	Hitachi
Model	YUTAKI RWM-2R1E
Category	Air Conditioner
Language	English