SERVICING
33
S-115 COMPRESSOR BURNOUT
When a compressor burns out, high temperature develops caus-
ing the refrigerant, oil and motor insulation to decompose form-
ing acids and sludge.
If a compressor is suspected of being burned-out, attach a refrig-
erant hose to the liquid line dill valve and properly remove and
dispose of the refrigerant.
NOTICE
Violation of EPA regulations may result in fines
or other penalties.
Now determine if a burn out has actually occurred. Confirm by
analyzing an oil sample using a Sporlan Acid Test Kit, AK-3 or its
equivalent.
Remove the compressor and obtain an oil sample from the suc-
tion stub. If the oil is not acidic, either a burnout has not occurred
or the burnout is so mild that a complete clean-up is not neces-
sary.
If acid level is unacceptable, the system must be cleaned by using
the clean-up drier method.
CAUTION
Do not allow the sludge or oil to contact the skin.
Severe burns may result.
NOTE: The Flushing Method using R-11 refrigerant is no longer
approved by Daikin Brand Heating-Cooling.
S-120 REFRIGERANT PIPING
The piping of a refrigeration system is very important in relation
to system capacity, proper oil return to compressor, pumping rate
of compressor and cooling performance of the evaporator. A bi-
flow filter drier must be brazed on by the installer onsite. Ensure
the bi-flow filter drier pain finish is intact after brazing. If the
paint of the steel filter drier has been burned or chipped, repaint
or treat with a rust preventative. The recommended location of
the filter drier is before the expansion deveice at the indoor unit.
The liquid line must be insulated if more han 50 ft. of liquid line
will pass through an area that may reach temperatures of 30° F of
higher than ambient in cooling mode and/or if the temperature
inside the conditioned space may reach a temperature lower than
ambient in heating mode. FVC oils maintain a consistent viscos-
ity over a large temperature range which aids in the oil return to
the compressor; however, there will be some installations which
require oil return traps. These installations should be avoided
whenever possible, as adding oil traps to the refrigerant lines
also increases the opportunity for debris and moisture to be in-
troduced into the system. Avoid long running traps in horizontal
suction line.
IMPORTANT
To avoid overheating the service valve, TXV, sensor, or filter
drier while brazing, wrap the component with a wet rag, or
use a thermal heat trap compound. Be sure to follow the
manufacturer’s instruction when using the heat trap
compound. Note: Remove Schrader valves from service
valves before brazing tubes to the valves. Use a brazing alloy
of 2% minimum silver content. Do not use flux.
Torch heat required to braze tubes of various sizes is
proportional to the size of the tube. Tubes of smaller size
require less heat to bring the tube to brazing temperature
before adding brazing alloy. Applying too much heat to any
tube can melt the tube. Service personnel must use the
appropriate heat level for the size of the tube being brazed.
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