Hitachi HRNM Série Manuel D'installation page 34

PIPING AND REFRIGERANT CHARGE
22
(b) Bottom Side Piping Work
After removing bottom of the piping cover, perform
piping and wiring works.
Liquid Piping
Screw
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.
NOTES:
To avoid damage protect cables and
pipes with adequate insulation (Field-
Supplied).
After connecting the refrigerant piping, seal the open
-
space between knockout hole and refrigerant pipes by
using insulation material.
Confirm that the valve is closed.
-
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.
Prepare a field-supplied bend pipe for gas line. Braze it
-
and the factory-supplied pipe flange at the outside of the
unit.
Factory-Supplied Pipe Flange
Solder by Bottom Side up
Field-Supplied Bend Pipe
Conduit
Gas Piping
Bottom Side Piping Hole
Bottom Base
Piping Cover
Rear cover
NOTE:
For connecting Ø25.4 pipe to RAS-8~12HRNM unit, use
-
the pipe flange (factory-supplied)
Remove the flange and the gasket attached to the unit
-
before shipping, and attach the new gasket (factory-
supplied) before connecting the pipe flange to the gas
valve.
Do not use the gasket that had been attached to the unit.
-
Gas Valve
Remove
Gasket
Flange
Braze the bend pipes and field piping.
-
Gasket
Pipe Flange