Hitachi HRNM Serie Installations- Und Betriebshandbuch Seite 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