TC-12001
2-19
IN-THE-CEILING (DUCT)
P5414985
13
5. Refrigerant Piping Work
Fig. 5.1 Position of Piping Connection
(1) Position of piping connection is shown
below.
O
Cap the end of the pipe when the pipe is to be
inserted through a hole.
O
Do not put pipes on the ground directly
without a cap or vinyl tape at the end of the
pipe.
O
An excess or a shortage of refrigerant is the
main cause of trouble to the units.
Charge the correct refrigerant quantity.
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
(2)
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spanners as shown in Fig. 5.3.
Model
a
RPI-3.0FSN2SQ
71
RPI-4.0FSN2SQ
RPI-5.0FSN2SQ
RPI-6.0FSN2SQ
81
mm (in.)
Model
Gas Piping
Liquid Piping
RPI-3.0FSN2SQ
RPI-4.0FSN2SQ
RPI-5.0FSN2SQ
I
15.88 (5/8)
I
9.52 (3/8)
RPI-6.0FSN2SQ
I
15.88 (5/8)
or
I
19.05 (3/4)*
*: When the pipe size of
I
19.05 is used, apply the
UHGXFHU¿HOGVXSSOLHGWR¿WWKH
I
15.88 pipe for
indoor unit connection.
< RPI-3.0FSN2SQ - RPI-6.0FSN2SQ >
< RPI-7.0FSN2SQ >
Fig. 5.2 Position of Piping Connection
Fig. 5.4 Insulation on Pipes
Fig. 5.3 Tightening Work of Flare Nut
(4) Evacuation and refrigerant charging
procedures should be performed according
to “Installation & Maintenance Manual” of the
outdoor unit.
(3) After connecting the refrigerant piping, seal
the refrigerant pipes by using the factory-
supplied insulation material as shown in Fig
5.4.
Pipe Size
Tightening Torque (N-m)
I
6.35mm
20
I
9.52mm
40
I
15.88mm
80
I
19.05mm
100
8VHWKHVSHFL¿HGQRQÀDPPDEOHUHIULJHUDQW
(R410A) to the outdoor unit in the refrigerant
cycle. Do not charge material other than R410A
into the unit such as hydrocarbon refrigerants
SURSDQHRUHWFR[\JHQÀDPPDEOHJDVHV
(acetylene or etc.) or poisonous gases when
installing, maintaining and moving. These
ÀDPPDEOHVDUHH[WUHPHO\GDQJHURXVDQGPD\
FDXVHDQH[SORVLRQD¿UHDQGLQMXU\
Correct
Incorrect
Refrigerant Liquid Pipe
Connection
Refrigerant Gas Pipe
Connection
Drain Pipe Connection
377
321
246
244
204
23
90
95
a
Refrigerant Liquid
Pipe Connection
Refrigerant Gas
Pipe Connection
Drain Pipe
Connection
174
550
1,430
440
320
200
25
Air Outlet
Air Inlet
90
230
167
Insulation for
Refrigerant Pipe
(Factory-Supplied)
Insulation for
Refrigerant Pipe
(Field-Supplied)
Refrigerant Pipe
(Field-Supplied)
Cord Clamp
(Factory-Supplied)
Unit
Side
Insulation Material
(Factory-Supplied)
