Hitachi RAS-3HVRNME-AF, Installation And Operation Manual, Page: 26 / 40

PMML0205A rev.4 - 11/2012
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10.2. SUSPENSION OF REFRIGERANT PIPING
Suspend the refrigerant piping at certain points and prevent the
refrigerant piping from touching the weak part of the building
such as wall, ceiling, etc…
(If touched, abnormal sound may occur due to the vibration of
the piping. Pay special attention in case of short piping length).
Do not fix the refrigerant piping directly with the metal fittings
(The refrigerant piping may expand and contract).
Some examples for suspension method are shown below.
10.3. PIPING CONNECTION FOR OUTDOOR UNIT
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)

Front side piping work
 Piping work

Stop Valve
 Removing Direction for Service Cover

CAUTION:
Notes to open/close the service cover:

Remove the screws following the instructions to the above figure.

Slowly press down the cover

NOTE:
Hold the cover with a hand to remove screws as the cover may fall
down.
¡
For the front and side piping
To use racking or conduit tubes, check the size and remove
part following the slit.

NOTE:
Place insulation (field supplied) to protect cables and pipes from
being damaged by plate edges.
¡
For the downward piping

NOTE:
Cables shall not contact directly to the pipes.
¡
For the rear side piping

NOTE:
Remove the rear pipe cover under the rear cover and remove
part following the slit.
For Suspending
Heavies
For piping along
the wall
For instant
installation work
1~15m
Indor unit
Fire-Proof
Section
Treatment
Front piping hole
Side piping hole
Gas piping
Knock-out hole
Bottom base
Cables
Liquid piping
Service cover
Hook (three places): two fans
Hook (two places): one fan
Rear Cover
REFRIGERANT PIPING &
REFRIGERANT CHARGE