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 R32 refrigerant. During leakage check and
test, do not mix oxygen, acetylene and other
flammable or reactive gases, because these gases
result in explosion.
Use compressed nitrogen to perform these
experiments.
4.1 Pipe Material
(1) Prepare the copper pipe on the spot.
(2) Choose dustless, non-humid, and 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. 4.2.
4.2 Piping Connection
(1) The connection positions of the pipe are shown in
Fig. 4.1 and Fig. 4.2.
Liquid piping
Gas piping
Fig. 4.1 The connection positions of the pipe
Capacity
(Btu/h)
18K
25K~55K
Fig. 4.2 The pipe diameter
The pipe can be connected from three different
directions. (rear, right, top).
If the pipe is routed from the back side, remove the
brackets for easier piping work. After piping, reinstall
the removed bracket.
Fig. 4.3
If the pipe is routed from the back side.
Cut the removed top cover, and install on the rear
panel instead of rear cover.
(Unit: mm)
Drain piping
(left)
Drain piping
(right)
Liquid
Gas pipe(mm)
pipe(mm)
φ12.7 φ6.35
φ15.88 φ9.52
Installation and Maintenance
(2) As shown in Fig. 4.4, screw up the nuts with 2 spanners.
Pipe size
φ6.35mm
φ9.52mm
φ12.7mm
φ15.88mm
φ19.05mm
Fig. 4.4
(3) After completing refrigerant pipe connection, keep
it warm with the insulation material.
Clamp(attached) Insulation (attached)
Side of the
indoor unit
Fig. 4.5 Piping insulation procedure
CAUTION
·
The pipe should pass through the hole with a seal.
·
Do not place the pipes on the floor directly.
Do not put the pipes directly on
the floor.
Protected with the tape or plug.
27
Torque (N·m)
20
40
60
80
100
Refrigerant pipe
(field supplied)
Insulation
(field supplied)