PKG-SVX029A-EN
45
Compressors
Scroll Compressor Failure Diagnosis and
Replacement
If compressor failure is suspected, refer to CSHD and
CSHN/CSHL Compressors Installation and Service
Installation Instructions (COM-SVN01*-EN) for detailed
information regarding compressor failure diagnosis and
replacement of scroll compressors.
Refrigerant System
If refrigerant system repair is required, Leak Test, Brazing
and Evacuation Procedures are described.
Preliminary charging is described in the Installation –
Mechanical section, “Refrigerant System,” p. 22 and final
charging is described in the Start-Up section, “Final
Refrigerant Charge,” p. 42.
Refrigerant systems that have been opened must have
filter driers replaced and complete leak test and evacuation
before recharging. Unit is equipped with replaceable filter
core option for easy maintenance.
Refrigerant Leak Test Procedure
WARNING
Confined Space Hazards!
Failure to follow instructions below could result in
death or serious injury.
Do not work in confined spaces where refrigerant or
other hazardous, toxic, or flammable gas may be
leaking. Refrigerant or other gases could displace
available oxygen to breathe, causing possible
asphyxiation or other serious health risks. Some
gases may be flammable and/or explosive. If a leak in
such spaces is detected, evacuate the area
immediately and contact the proper rescue or
response authority.
WARNING
Explosion Hazard!
Failure to follow safe leak test procedures below
could result in death or serious injury or equipment or
property-only-damage.
Never use an open flame to detect gas leaks. Use a
leak test solution for leak testing.
WARNING
Explosion Hazard!
Failure to follow these instructions could result in
death or serious injury or equipment or property-only
damage.
Use only dry nitrogen with a pressure regulator for
pressurizing unit. Do not use acetylene, oxygen or
compressed air or mixtures containing them for
pressure testing. Do not use hydrogen mixtures
containing refrigerant and air above atmospheric
pressure for pressure testing as they may become
flammable and could result in an explosion.
Refrigerant, when used as a trace gas should only be
mixed with dry nitrogen for pressurizing units.
WARNING
Explosion Hazard!
Failure to follow instruction below could result in
death or serious injury.
Do not exceed unit nameplate design pressures when
leak testing system.
WARNING
Refrigerant under High Pressure!
Failure to follow instructions below could result in an
explosion which could result in death or serious
injury or equipment damage.
System contains refrigerant under high pressure.
Recover refrigerant to relieve pressure before
opening the system. See unit nameplate for
refrigerant type. Do not use non-approved
refrigerants, refrigerant substitutes, or refrigerant
additives.
Note: These service procedures require working with
refrigerant. Do not release refrigerant to the
atmosphere. The service technician must comply
with all federal, state, and local laws.
When leak-testing refrigerant systems, observe all safety
precautions. Leak test only one circuit at a time to minimize
system exposure to potentially harmful moisture in the air.
System Repair
1. Connect R-454B refrigerant cylinder to charging port,
add refrigerant to reach pressure of 12 to 15 psig.
2. Disconnect refrigerant cylinder. Connect dry nitrogen
cylinder to high side charging port and increase
pressure to 150 psig. DO NOT exceed unit nameplate
design pressures. If testing complete system, low side
design pressure is maximum.
3. Check piping and/or components as appropriate for
leaks.
4. Recommend using electronic detector capable of
measuring 0.1 oz/year leak rate.
5. If a leak is located, use proper procedures to remove
Maintenance
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