Hitachi 3HRNM1Q, Installation & Maintenance Manual

Page: 20 / 36

5.4 Air Tight Test
(1) The stop valve has been closed before
shipment, however, make sure that the stop
valves are closed completely.
(2) Connect the indoor unit and the outdoor
unit with field-supplied 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.)
(3) Apply the oil thinly at the seat surface of the
flare nut and pipe before tightening.
And when tightening the flare nut, use two
spanners.
Lubrication Oil is field-supply.
Model: FVB68D (Ether Oil)
Manufacturer: IDEMITSU KOSAN Co., Ltd.
NOTE:
To avoid damage protect cables and
pipes with adequate insulation (Field-
Supplied).
(6) To prevent gaps use a rubber bush and
insulation (Factory-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.
(7) Use a pipe bender or elbow (Field-
Supplied) for bending work when
connecting pipe.
(c) Rear Piping Work
After removing rear piping cover, punch
out the “C” holes along the guide line.
Rear Cover
C
Completion
of Ref.
Piping
Repairing
of Leakage
Part
Check of
Pressure
Decrease
Applying
Nitrogen
Gas
Pass
Procedure
Do not apply an abnormal big force to
the spindle valve at the end of opening
(5.0N-m or smaller).
The back seat construction is not provided.
Do not loosen the stop ring. If the stop ring
is loosened, it is dangerous, since the
spindle will hop out.
At the test run, fully open the spindle.
If not fully opened, the devices will be
damaged.
(4) Stop Valve
Operation of the stop valve should be
performed according to the below.
Spindle Valve Torque (N-m)
Gas Liquid
Hexagonal Wrench Size (mm)
Gas Liquid
13
spindle valve
To open or close
Wrench(Size:4mm)
Hexagonal
(rubber)
O-Ring
Liquid Valve:37N m
Gas Valve:49N m
(Attach this after work)
torque below.
Tighten the cap with a
Liquid Valve:16N m Cap
torque below.
Tighten the cap with a
( )
can be connected
Only the charging hose
leakage will occur
at this posotion.If applied,
Do not apply two spanners
flare nut
here to squeeze
Use two spanners
Spindle Valve
Counterclockwise
Open
Close
Clockise
Close before shipment
Ref.Pressure
Refrigerant Piping
Liquid Stop Valve
. . ..
. . ..
Check Joint
.
.
.
Refrigerant Piping
( )