Refrigerant Piping Work; Piping Materials; Piping Connection - Hitachi RPI-3.0FSN2SQ Installation & Maintenance Manual

5.

Refrigerant Piping Work

(R410A) to the outdoor unit in the refrigerant
cycle. Do not charge material other than R410A
into the unit such as hydrocarbon refrigerants
(acetylene or etc.) or poisonous gases when
installing, maintaining and moving. These
5.1

Piping Materials

(1) Prepare locally-supplied copper pipes.
(2) Select clean copper tubes making sure there
is no dust and moisture inside the tubes.
Before connecting pipes, blow the inside of
the tubes with nitrogen or dry air, to remove
any dust or foreign materials.
5.2

Piping Connection

Cap the end of the pipe when the pipe is to be
inserted through a hole.
Do not put pipes on the ground directly
without a cap or vinyl tape at the end of the
pipe.
Correct
An excess or a shortage of refrigerant is the
main cause of trouble to the units.
Charge the correct refrigerant quantity.
(1) Position of piping connection is shown
below.
< RPI-3.0FSN2SQ - RPI-6.0FSN2SQ >
95
a
90
Model
RPI-3.0FSN2SQ
RPI-4.0FSN2SQ
RPI-5.0FSN2SQ
RPI-6.0FSN2SQ
Fig. 5.1 Position of Piping Connection
P5414985
TC-12001
Incorrect
Refrigerant Gas Pipe
Connection
377
321
Refrigerant Liquid Pipe
Connection
246
a
Drain Pipe Connection
71
81
Model
RPI-3.0FSN2SQ
RPI-4.0FSN2SQ
RPI-5.0FSN2SQ
RPI-6.0FSN2SQ
*: When the pipe size of 19.05 is used, apply the
indoor unit connection.
< RPI-7.0FSN2SQ >
550
174
230
Air Outlet Air Inlet
167
Refrigerant Liquid
90
Pipe Connection
Drain Pipe
Refrigerant Gas
Connection
Pipe Connection
Fig. 5.2 Position of Piping Connection
(2)
spanners as shown in Fig. 5.3.
Pipe Size Tightening Torque (N-m)
6.35mm
9.52mm
15.88mm
19.05mm
Fig. 5.3 Tightening Work of Flare Nut
(3) After connecting the refrigerant piping, seal
the refrigerant pipes by using the factory-
supplied insulation material as shown in Fig
5.4.
Cord Clamp
(Factory-Supplied)
Unit
Side
Insulation Material
(Factory-Supplied)
Fig. 5.4 Insulation on Pipes
(4) Evacuation and refrigerant charging
procedures should be performed according
to "Installation & Maintenance Manual" of the
outdoor unit.
IN-THE-CEILING (DUCT)
mm (in.)
Gas Piping Liquid Piping
15.88 (5/8)
9.52 (3/8)
15.88 (5/8)
or
19.05 (3/4)*
15.88 pipe for
1,430
20
40
80
100
Insulation for
Refrigerant Pipe
(Factory-Supplied)
Refrigerant Pipe
(Field-Supplied)
Insulation for
Refrigerant Pipe
(Field-Supplied)
13
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