Hitachi SET FREE SIDE FLOW Serie Bedienungsanleitung Seite 23

REFRIGERANT PIPING & REFRIGERANT CHARGE
No contacting shall exist between pipes and cables.
Attach insulation (Field-supplied) to the cables and pipes
for protection.
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N O T E
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.
Liquid Piping
Screw
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N O T E
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.
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N O T E
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 difficult. 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.
13 PMML0390B REV.0 - 11/2015 - P5416649
Conduit
Gas Piping
Bottom Side Piping Hole
Bottom Base
Piping Cover
Rear Cover
b. Connect the indoor unit and the outdoor unit with field-
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 flare nuts
and pipe before tightening.
Flare Nut Connetion
of Indoor Unit Side
Stop Valve of Outdoor Unit
Never apply a force
here by spanner.
If not, refrigerant
leakage may occur
Confirm that there is no refrigerant leakage of the piping
connections.
d. Attach insulations to the flare nut connections and each
refrigerant pipe.
6 Stop Valve
Operation of the stop valves should be performed according
to the followings.
a. Gas Valve
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
• 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
Two Spanners Work
Stop Valve
Flare Nut
Do not apply two spanners
at this portion. If applied,
leakage will occur
Use two spanners
here to squeeze
flare nut
Attaching Detail for Ring
Ring
Pin Stopper