Unit installation

Installation - Mechanical
34 SCXF-SVX01K-EN
and repair leak using proper brazing procedures. See
Maintenance section, “Brazing Procedures,” p. 85. Retest
unit(s) to ensure all leaks are repaired. Continue with
piping installation.
Interconnecting Piping
Refrigerant piping must be properly sized and applied.
These two factors have a significant effect on both system
performance and reliability.
Using Table 24, p. 34, select proper liquid and discharge
line size. Unit connection sizes are also shown. Install
interconnecting piping using proper installation and
brazing procedures.
Work on only one circuit at a time to minimize system
exposure to potentially harmful moisture in the air.
Before installing piping verify compressor oil levels are
near top of sight glass or above.
Note: CSC units (and replacement compressors) ship
fully charged with POE oil from the factory. Scroll
compressors use POE oil (OIL00079, quart
container or OIL00080, gallon container), DO NOT
substitute.
Capped discharge and liquid line connections are located
near bottom, left side of the indoor unit. CCRC/CIRC
connections are located in the unit front, at top.
Remove caps with a tube cutter to minimize risk of getting
chips inside piping.
Note: When facing control panel side of unit, Circuit #2 is
always on left and Circuit #1 on the right.
Cleanliness is extremely important during system
installation to minimize residual contaminants, such as
oxidization and scale.
Attach vacuum pump and begin evacuation as soon as
piping installation is complete.This starts system
dehydration and helps prevent POE compressor oil
contamination.This will also indicate large leaks if
vacuum does not hold (below 400 microns and hold for 2
hours). Complete LeakTest and Evacuation (for
procedures, see “Refrigerant LeakTest Procedure,” p. 84
and “System Evacuation Procedures,” p. 86 in
Maintenance section) before starting “Preliminary
Refrigerant Charging,” p. 35.
Note: Installation of a field supplied discharge line access
port near indoor units with optional discharge line
ball valve will mak e high side pressure
measurements easier during leak test.
Note: UseType “L” refrigerant grade copper tubing only.
NOTICE:
Equipment Damage!
Compressors contain POE oil which readily absorbs
moisture directly from the air. Moisture absorbed by
POE oil is very difficult to remove by evacuation and
can cause compressor failure. To prevent
contamination, this unit shipped sealed containing dry
nitrogen. Minimize the amount of time the system is
open to the atmosphere. When open, flow dry nitrogen
through the piping to prevent atmospheric moisture
from contacting compressor POE oil.
Table 24. Refrigerant piping sizes
Air Cooled Signature Connection Size (in)
Circuit 1 Circuit 2
SXRF Size Liquid Discharge Liquid Discharge
20, 25, 29 5/8 7/8 5/8 7/8
30, 35, 40, 50 7/8 1 3/8 5/8 7/8
60 7/8 1 3/8 5/8 7/8
Remote Condenser Connection Size (in)
CXRC Size
Circuit 1 Circuit 2
Liquid Discharge Liquid Discharge
20, 29 5/8 7/8 5/8 7/8
35, 40, 50 7/8 1 3/8 5/8 7/8
60 7/8 1 3/8 5/8 7/8
Interconnecting Tube Size (in)
SXRF/CXRC
Size
Circuit 1 Circuit 2
Liquid Discharge Liquid Discharge
20/20 5/8 7/8 5/8 7/8
25/29 5/8 1 1/8 5/8 7/8
29/29 5/8 1 1/8 5/8 7/8
30/35 7/8 1 1/8 5/8 7/8
35/35 7/8 1 1/8 5/8 7/8
40/40 7/8 1 3/8
(a)
(a)Use 1 1/8” for vertical risers.
5/8 7/8
50/50 7/8 1 3/8 5/8 1 1/8
60/60 7/8 1 3/8 7/8 1 3/8