Hitachi 3HRNM1Q, Installation & Maintenance Manual

Page: 19 / 36

5.3 Piping Connection
Pipes can be connected from 4 directions.
Rear Side
Piping Cover
Rear Side Piping Work
(Knock-Out Hole)
Bottom Side
Piping Work
Front Side
Piping Work
(Knock-Out Hole)
Fig. 5.1 Piping Direction
(1) Confirm that the valve is closed.
(2) Prepare a field-supplied bend pipe for
liquid line. Connect it to the liquid valve by
flare nut through the square hole of bottom
base.
(3) For Gas Piping Connection
Prepare a field-supplied bend pipe for gas
line. Braze it and the factory-supplied pipe
flange at the outside of the unit.
Double Spanner Work Tightening Work for Stop Valve
Do not apply the double
spanner work here.
Refrigerant leakage shall
occur.
Pipe Size Tightening Torque for Flare Nut
(5) Pipes can be connected from 4 directions
as shown Fig. 5.1. Make a knock-out hole
in the front pipe cover or bottom base to
pass through the hole.
After removing the pipe cover from the unit,
punch out the holes following the guide line
with screwdriver and a hammer.
Then, cut the edge of the holes and attach
insulation (Field-Supplied) for cables and
pipes protection.
(a) Front and Right Side Piping Work
Select the correct knock-out size
depending on whether it is for power
wiring or transition wiring.
It is available to correct the liquid or gas
piping, power wiring less than 14mm
2
and transition wiring from “A” part.
NOTE:
When using conduit, check to the tube
size before removing “B” part.
(b) Bottom Side Piping Work
After removing bottom of the piping
cover, perform piping and wiring works.
B
A
Front Side Piping Hole
Right Side Piping Hole
NOTE:
Prevent the cables from coming into
direct contact with the piping.
Conduit
Gas Piping
Liquid Piping
Screw
Piping Cover
Bottom Base
Bottom Side Piping Hole
12
(Knock-Out Hole)
(Knock-Out Hole)