CAUTION: If a system has fallen into a
contaminated state, the introduction of
CLIPLIGHT's HVACR sealants may
accelerate the overall failure of the
system. Wet refrigerants laden with
moisture or particle contamination can
cause premature set-up of sealant
lowering sealing capabilities and form restrictions in strainer baskets such as
those that exist before a TXV or similar expansion device. The characteristics
of the sealant are such that it can act as a cleaning agent picking up
contaminants/particulate and deposit them in driers and filter screens. It is
therefore essential that a system is clean or has filters installed to help trap
these contaminants so they will not interfere with the performance of the unit.
Whenever refrigerant has been recovered replace system driers. The system
must be evacuated to remove all the non-condensables. This can only be
accomplished by means of the triple evacuation method.
3. PHYSICAL INSPECTION: System should be charged so that superheat and
sub cooling is functioning at peak performance. Condensers and evaporators
should be cleaned including blowers so that proper air/heat exchange is taking
i. Charge system to proper operating conditions.
ii. Check temperature of operating compressor 1 inch or 2.54 cm up
i. LOW REFRIGERANT LEVELS: If the unit has been found to have a
history of refrigerant leaks then a test should be performed to evaluate
if there are non-condensable in the system. Units that are operating
with excessive levels of non-condensable will exhibit higher than
normal head pressures. Where the system has been fitted with proper
isolation valves and pressure ports a comparison between the liquid
refrigerant pressure and corresponding saturation temperature at
ambient conditions can also help to determine if foreign gases are
ii. ACID/ MOISTURE CONTAMINATION: The unit should be checked
using an acid/moisture test kit and followed up with a recommended
clean up procedure, if required. Refrigerant must be recovered and
system evacuated to completely remove all moisture and non
condensable. Always install a new liquid line drier each time a system
is opened up.
iii. BURNOUTS: Systems which have experienced a compressor
burnout and have not under
gone a complete flushing of
contaminants should have the
refrigerant recovered and a
procedure carried out with new
liquid /suction driers installed.
The Final Word In Leak Solutions 6
from base. Readings above 130°F/ 54°C indicates abnormal condition,
repair as required.
iii. Check discharge temperature measured 1 to 2 inches or 2.54 cm to
5.08 cm downstream of the compressor on the discharge line.
Readings above 225°F (107.2°C) indicate formation of contaminants,
repair as required.
iv. Measure temperature across the liquid line drier to determine if a new
drier is required. Temperature differential should be no more than
2°F/1°C. On larger driers temperature or pressure differentials can
vary therefore one should consult with manufacturers specifications to
properly determine what is acceptable.
v. Failure to follow these check points may result in compressor failure.