Hitachi CH Series Installation And Operation Manual page 17

CH-12.0N
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To
Indoor
Unit
3. When tightening the Flare nut, use two spanners as shown in below figure.
4. After connecting the refrigerant piping, seal the refrigerant pipes by using the field-supplied
insulation materials as shown in figure below.
Use the factory-supplied pipe with a flange to connect low-pressure gas piping. The gasket at the
unit gas piping inlet should be replaced to the one supplied with your unit.
(Thermal insulator over the flange connection should be field-supplied).
NOTE:
The factory-supplied flange should be welded with the connection pipe before connecting the
valve. Mount the Insulation's after the pipe brazing. Take particular care upon connecting
flange so that Insulation is correctly located.
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To
Indoor
Unit
No Description
REFRIGERANT PIPING WORK
Pipe Size
∅6.35
(1/4)
∅9.53
(3/8)
∅12.7
(1/2)
∅15.88
(5/8)
∅19.05
(3/4)
Insulation - Field Supplied – CH-4.0NE unit
Insulation - Field Supplied – CH-(4.0/8.0/12.0)NE units
- Field Supplied – CH-(4.0/8.0)NE
Insulation
- Included in CH-12.0N unit as accessory.
No Description
Pipe Fixing Band
Liquid Pipe
}
High Gas Pipe
To
Low Gas Pipe
Outdoor
Unit Gas Pipe
Pipe Flange
Field-Supplied
Piping
Tightening Torque (N.m)
2
4
6
8
10
}
Outdoor
Remarks
11
To
Unit