3. Limit time the system is opened.
DO NOT EXPOSE OPEN SYSTEM FOR
MORE THAN 15 MINUTES.
This will result in sealed system failure. Leave
replacement parts sealed and/or pressurized until ready to install.
4. The compressor must be replaced if there is a low side leak. Moisture has bee drawn
into the system if the unit has been running extended period of time. Be sure to flush
the system with dry nitrogen gas and evacuate to 50 microns before re-charging (see
section 2.2,
Low Side Leaks
).
5. A new evaporator assembly must be ordered if the capillary tube is found to be
plugged or severely restricted. Restrictions cannot be flushed out.
6. Be sure to purge the system after final brazing. This will flush out any air or moisture
that may have entered the system before being absorbed into the ester oil.
Testing of the electrical system, defrost system, controls, and air flow
should be performed before any sealed system. What may first appear
to be a system component failure may be only a simple control, air flow,
electrical, or defrost system problem.
2.2 Low Side Leaks
Low side leaks consist of a break in the system at the evaporator, low side (suction)
return line, or accumulator. If a leak is found in any of these areas, moisture has probably
entered the system. The compressor, drier, and hot gas valve will have to be replaced and
the system will need to be flushed thoroughly with nitrogen gas and evacuated to 50
microns before recharging.
2.3 High Side Leaks
High side leaks consist of a break in the system at the condenser, high side tubing, drier,
or capillary tube. If a leak is found in any of these areas, the system can be flushed with
nitrogen gas, evacuated to 50 microns, and recharged.
2.4 Restricted Capillary Tube
Moisture or other contaminants that enter the system can cause deposits in the system.
These deposits will usually collect in the capillary tube and form a restriction that cannot
be completely removed be flushing. If the capillary tube is found to be restricted, the
evaporator, compressor, condenser and drier should all be replaced.
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