CXRC-SVX01J-EN
17
Interconnecting Piping
Refrigerant piping must be properly sized and applied.
These two factors have significant effect on both
system performance and reliability.
IImmppoorrttaanntt:: Cleanliness is extremely important during
system installation to minimize residual
contaminants, such as oxidization and
scale.
• See Table 4, p. 17 for recommended discharge and
liquid line sizes. Table also includes unit
connections sizes.
• Verify compressor oil levels are near top of sight
glass or above.
• Verify remote condenser system is sealed by
momentarily depressing liquid line access port
valve. If holding charge is present, continue piping
installation. If not, locate and repair any leaks. Refer
to the sections,“Refrigerant Leak Test
Procedure,” p. 25 and “System Evacuation
Procedures,” p. 26.
• Work on only one circuit at a time to minimize
system exposure to moisture in the air.
• Capped discharge and liquid line connections are
located near bottom of the indoor unit, left side for
SCRF/SIRF, right side for SCRG/SIRG. CCRC/CIRC
connections are located in the unit front at the top.
• Remove cap with a tube cutter to minimize risk of
getting chips inside piping.
Table 4. Refrigerant Connection and Piping Sizes
Connection Size
CXRC Size
Circuit 1 Circuit 2
Liquid Discharge Liquid Discharge
20, 29, 32
5/8 in 7/8 in 5/8 in 7/8 in
35, 40, 50
7/8 in 1-3/8 in 5/8 in 7/8 in
60
7/8 in 1-3/8 in 5/8 in 7/8 in
SXRF Size
Circuit 1 Circuit 2
Liquid Discharge Liquid Discharge
20, 25, 29
5/8 in 7/8 in 5/8 in 7/8 in
30, 35, 40, 50
7/8 in 1-3/8 in 5/8 in 7/8 in
60
7/8 in 1-3/8 in 5/8 in 7/8 in
SXRG Size
Circuit 1 Circuit 2
Liquid Discharge Liquid Discharge
20, 25, 32
5/8 in 7/8 in 5/8 in 7/8 in
Interconnecting Tube
SXRF/CXRC Size
Circuit 1 Circuit 2
Liquid Discharge Liquid Discharge
20/20 5/8 7/8 in 5/8 in 7/8 in
25/29 5/8 1-1/8 in 5/8 in 7/8 in
29/29 5/8 1-1/8 in 5/8 in 7/8 in
30/35 7/8 1-1/8 in 5/8 in 7/8 in
35/35 7/8 1-1/8 in 5/8 in 7/8 in
40/40 7/8 1-3/8 in
(a)
5/8 in 7/8 in
50/50 7/8 1-3/8 in 5/8 in 1-1/8 in
60/60 7/8 1 3/8 in 7/8 in 1-3/8 in
IInnssttaallllaattiioonn -- MMeecchhaanniiccaall
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