Hitachi YUTAKI RWM-2R1E Installation & Operation Manual page 62

REFRIGERANT AND WATER PIPING
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.
Do not apply
two spanners at
this position. If
applied, leakage
will occur.
!
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 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.
48 PMML0575 rev.2 - 03/2022
Outdoor unit stop valve
Spindle Type
Liquid




(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
Gas valve 9-11
8/10HP: 100
Stop valve
(Spindle type)
Do not work with
two spanners
Flare nut
here.
Refrigerant
leakage shall
occur.
Ball Type
Gas
(a)
Spindle valve
Flare nut
Cap
Check joint for service port
 
40
33-42
10HP: 60
80
(4-10)HP: 20-25
Use two spanners
here for pipe
connection.
Spindle type

14-18
Do not apply two
spanners work here.
Position to apply
spanners.
Ball type