Indoor Unit Refrigerant Pipe; The Pipe Material; The Connection Of The Pipe - Hitachi air core 600 Installation & Maintenance Manual

4. Indoor Unit Refrigerant Pipe

DANGER
Use the refrigerant according to outdoor nameplate.
When carrying on the leakage check and test, do not
mix in the oxygen, the acetylene and flammable and
the virulent gas, for these gases are quite dangerous,
and may possibly cause explosion. It is suggested
that the nitrogen be used to perform these experiments.

4.1 The Pipe Material

(1) Prepare the copper pipe on the spot.
(2) Choose dustless, non-humid, clean copper pipe.
Before installing the pipe, use nitrogen or dry air to
blow away the tube dust and impurity.
(3) Choose the copper pipe according to Fig. 4.1.

4.2 The Connection of the Pipe

(1) The pipe diameter are shown in Fig. 4.1.
Model Gas Pipe(mm) Liquid Pipe(mm)
18K
25/30K
36/42/48/55K
Fig. 4.1 The pipe diameter
(2) As shown in Fig. 4.2, screw up the nuts with 2 spanners.
Pipe size
φ6.35mm
φ9.52mm
φ12.7mm
φ15.88mm
φ19.05mm
Fig. 4.2 Tightening torque for the nut
φ12.7 φ6.35
φ15.88 φ9.52
φ19.05 φ9.52
Torque ( )
N·m
20
40
60
80
100
Installation and Maintenance
(3) After finishing connecting the refrigerant pipes, keep
it warm with the insulation material.
Clamp(field supplied) Insulation (field supplied)
Side of the
indoor unit
Fig. 4.3 Piping insulation procedure
CAUTION
Pass the pipe through the wall with the end sealed.
·
Do not place the pipes on the floor directly.
·
Correct
Protected with the tape or plug.
25
Refrigerant pipe
(field supplied)
Insulation
(field supplied)
Incorrect