STULZ CyberRow DX Series Installation, Operation & Maintenance Manual
pungent odor once the system has been opened.
If a burnout has occurred, the oil will be black and
acidic. A mechanical failure will have no burned odor
and the motor will attempt to run, an abnormal or
excessive noise may be present.
An analysis of the oil is the only way to determine
the proper procedure for cleaning the refrigerant
system. Acid test kits are available from several
manufacturers for measuring the acid level in the
oil. These are capable of making accurate acid
measurements, but if they are not available, a
check of the oil by sight and smell can give a quick
indication if contamination remains in the system.
CAUTION
Avoid touching or contacting the gas and oil with
exposed skin. Severe burns will result. Use long
rubber gloves in handling contaminated parts.
All electrical connections should be checked to
ensure they are tight and properly made. Check
all circuit breakers, contactors and wiring. The
contactors should be examined and replaced if
contacts are worn or pitted.
If there is acid in the oil, there has been an
electrical failure which has caused the compressor
motor to burn out. The acid diffuses throughout
the refrigeration system and must be removed by
using a burnout fi lter kit before a new compressor
is placed in service. Not only must the compressor
be replaced, but also the entire refrigeration circuit
must be cleaned of the harmful contaminants left by
the burnout. See section 5.3.3.2 (Burn-Out/Acidic
Cleanup) for the proper procedure.
If there is no acid in the oil, there has been a
mechanical failure. See section 5.3.3.3 (Standard
Cleanout) for the proper cleaning procedure.
CAUTION
Damage to a replacement compressor caused
by improper system cleaning constitutes abuse
under the terms of the warranty. This will
VOID
THE COMPRESSOR WARRANTY.
Always
consult the factory prior to replacing the
compressor.
CAUTION
PVE oil is used in systems with R410A refrigerant.
If a replacement compressor is provided, ensure
that it is fi lled with PVE oil before installing.
NOTE
Cleaning operations must be performed by
a journeyman, refrigeration mechanic, or air
conditioning technician.
5.3.3.2 Standard Cleanout Procedure
1.
Turn off power to unit at the main power
disconnect switch.
2.
Remove the old compressor and install the new
compressor.
3.
Remove the liquid line drier and install an
oversized liquid line fi lter-drier (one size larger
than the normal selection size).
4.
Evacuate the system according to standard
procedures. Normally, this will include the use of
a high-vacuum pump and a low-vacuum micron
gauge for measuring the vacuum obtained.
5.
Recharge the system.
6.
Turn on the power at the main power disconnect
switch and start the system.
5.3.3.3 Burn-Out/Acidic Cleanup Procedure
1.
These systems should be cleaned using the
suction line fi lter-drier method.
2.
Turn off power to the unit at the main power
disconnect switch.
3.
Remove the burned-out compressor and install
the new compressor.
4.
Install a suction line fi lter-drier designed for acid
removal.
5.
Remove the liquid line drier and install an
oversized liquid line fi lter-drier (one size larger
than the normal selection size).
6.
Check the expansion valve, sight glass and other
controls to see if cleaning or replacement is
required.
7.
Evacuate the system according to standard
procedures. Normally this will include the use of
a high-vacuum pump and a low-vacuum micron
gauge for measuring the vacuum obtained.
5-7
Summary of Contents for CyberRow DX CRS-042-G
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