Hitachi RAS-8-FSNM - Piping Work

ENGLISH
No contacting shall exist between pipes and cables.
Attach insulation (Field-supplied) to the cables and pipes
for protection.
? NOTE
Whenusingconduit,checktothetubesizebeforeremoving“B”
part.
b. Bottom Side Piping Work: After removing piping cover
from bottom base, perform piping and wiring works.
Screw
Conduit
Gas Piping
Bottom Base
Piping Cover
Liquid Piping
Bottom Side Piping Hole
? NOTE
Preventthecablesfromcomingintodirectcontactwiththepiping.
c. Rear Piping Work
After removing rear piping cover, punch out the “C” holes
along the guide line.
Rear Cover
? NOTE
To avoid damage protect cables and pipes with adequate
insulation(Field-supplied).
2 To avoid entering rain water, attach the piping cover to the
unit securely.
3 To prevent gaps use a rubber bush and insulation (Field-
Supplied) adequately when installing the piping cover. Cut
the lower side guide line of the piping cover when attaching
work is difcult. If not, it will be included water in the unit
and electrical parts will be damaged.
4 Use a pipe bender or elbow (Field-Supplied) for bending
work when connecting pipe.
5 Piping Work
a. The stop valve has been closed before shipment,
however, make sure that the stop valve are closed
completely.
b. Connect the indoor unit and the outdoor unit with eld-
supplied 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.)
c. Apply refrigerant oil thinly to the seat surface of are nuts
and pipe before tightening.
Flare Nut Connetion
of Indoor Unit Side
Two Spanners Work
Stop Valve of Outdoor Unit
Flare Nut
Stop Valve
Never apply a force
here by spanner.
If not, refrigerant
leakage may occur
Conrm that there is no refrigerant leakage of the piping
connections.
d. Attach insulations to the are nut connections and each
refrigerant pipe.
6 Stop Valve
Operation of the stop valves should be performed according
to the followings.
a. Gas Valve
Use two spanners
here to squeeze
are nut
Tighten the cap with
the torque at 30N·m
after this work
O-ring
(Rubber)
Check Joint
Only the charging hose can
be connected. Tighten the
cap with the torque at 13N·m
Refrigerant Piping
Do not apply two spanners
at this portion. If applied,
leakage will occur
• This valve is the ball valve.
The stem is turned to arrow direction for valve open and close
as below.
• Use adjustable wrench for the stem operation.
• Turn the stem until contact to the pin.
• Attach the ring securely after the stem operation.
• Do not leave the stem at half opening position.
Stem
Ring
Pin Stopper
Stem Position at Open
Stem Position at Close
Attaching Detail for Ring
Ring
Pin Stopper
REFRIGERANT PIPING & REFRIGERANT CHARGE
PMML0390B REV.0 - 11/2015 - P5416649
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