Hitachi UTOPIA ES Serie Bedienungsanleitung Seite 20

REFRIGERANT PIPING & REFRIGERANT CHARGE
8 REFRIGERANT PIPING & REFRIGERANT CHARGE
8.1 PIPING MATERIALS
1 Prepare locally-supplied copper pipes.
2 Select the piping size with the correct thickness and correct
material which can have sufficient pressure strength.
3 Select clean copper pipes. Make sure there is no dust and
moisture inside. Blow the inside of the pipes with oxygen
free nitrogen to remove any dust and foreign materials
before connecting pipes.
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N O T E
• A system with no moisture or oil contamination will give maximum
performance and lifecycle compared to that of a poorly prepared
system. Take particular care to ensure all copper piping is clean and
dry internally.
• There is no refrigerant in the cycle of the indoor unit.
8.2 PIPING CONNECTION FOR OUTDOOR UNIT

Gas pipe accessory (only for 8 and 10 HP)
For RAS-(8/10)HN(P/C)E, the gas pipe accessory with a flare
nut (factory-supplied silencer) shall be brazed to the field
supplied gas line, and connected to the gas valve.
1 The pipes can be connected from 4 directions. Make holes
in the piping cover or cabinet for taking out pipes. Take the
piping cover away from the unit, and 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.
Nº Description
Rear side piping work

Pipe Cover

Right side piping work

Bottom side piping work

(Knock out hole)
10 PMML0396B rev.0 - 11/2015
Nº Description
Front side piping work

Piping work

Stop Valve

Removing Direction for

Service Cover
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C A U T I O N
• Cap the end of the pipe when pipe is to be inserted through a hole
• Do not put pipes on the ground directly without a cap or vinyl tape at
the end of the pipe
• If piping installation is not completed until next day or over a longer
period of time, braze off the ends of the piping and charge with
oxygen free nitrogen through a Schrader valve type access fitting to
prevent moisture and particle contamination.
• Do not use insulation material that contains NH3 because it can
damage cooper pipe material and can be a source of future leakage.
• Completely insulate both refrigerant gas piping and liquid piping
between the indoor unit(s) and the outdoor unit.
• If not insulated, dew will ocur on the piping surface
!
C A U T I O N
Notes to open/close the service cover:
• Remove the screws following the instructions to the above figure.
• Slowly press down the cover.
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N O T E
Hold the cover with a hand to remove screws as the cover may fall down.
a. For the front and side piping
To use racking or conduit tubes, check the size and
remove part following the slit.
?
N O T E
Place insulation (field supplied) to protect cables and pipes from
being damaged by plate edges.
Service cover
Hook (two places)
Front piping hole
Side piping hole