Hitachi UTOPIA R32 Series Installation And Operation Manual page 33

!
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
difficulty with breathing or harmful gases would occur if a fire was being used in the room.
• When the cap is removed, a hissing sound may be heard because the gas trapped at O-ring
thread face is released. However, this is not gas leakage.
1 Take the piping cover away from the unit. Then fetch the pipes through the rear side and route
piping according to the installation place as shown in the figure. Make holes by cutting along the
guideline at the rear of the cover or punching with a driver. Remove the burr with a cutter, and
place a insulation (field supplied) to protect cables and pipes.
2 Attach the pipe cover in order to prevent rainwater from entering inside the cabinet.
3 Use a pipe bender for pipe bending work when connecting pipes.
4 Check to ensure that the stop valves are completely closed 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 Operation of stop valve should be performed according to the figure below.
PMEN0654 rev.0 - 12/2023
Do not work with two
spanners here.
Refrigerant leakage shall
occur.
Use two spanners here for
pipe connection.
Pipe cover
Rear side
piping
Stop valve
Screw
Direction to remove pipe cover
Connecting
piping
5
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