SERVICE MANUAL
Model: BD-429GAA
16
Issue 2009-03-09
Rev.
Ref0903S021V0
8-2. Abnormal phenomena
8-2-1 Reasons of electricity leakage of cabinet
1
1
.
.
Leakage of compressor: mainly because of serious vibration, the motor coil of compressor
contacts with the shell, the coat of enameled wire will come off somewhere and connect with shell.
Other reasons may be over voltage, insufficient of voltage, adverse circumstances (temperature
too high, ventilation and heat radiation too bad) for cabinet, thermal protection unit out of order,
etc. They will make the motor coil over temperature, insulation material loose, insulation is
damaged then electricity will occur.
2
2
.
.
Leakage of motor connection terminals: the connection terminals of fully enclosed compressor are
made from high temperature soda glass sintered ceramics, around the terminals are filled with a
high polymer. The terminals and insulation material must have the same linear expansion
coefficient, for requirement between terminals and the shell is more than 0.5 million ohm. The
reason of terminal leakage is that soda glass is broken or there are conductive materials such as
water, dirt, etc., adhered to terminals.
If electricity leakage occurs outside the compressor, please use tetra chloromethane or alcohol to
clean it. If the leakage occurs in the inner of compressor, it needs to be changed.
3
3
.
.
Leakage of temperature controller: Because of too long a period of service or too high
temperature, or too much dirt, or too high humidity, there may be electricity leakage. If it has been
defined that there is leakage of temperature controller, please change it.
4
4
.
.
Breakage of wire insulation can result in leakage of electricity. Wirings can be easily damaged
under such hard environments as insulations, humidity, acid or being compressed, and may also
result in electricity leakage.
8-2-2 Troubleshooting by observation
1
1
.
.
In normal conditions, the fan motor inside cabinet will run all the time. The fan in the compressor
room will work along with the compressor.
2
2
.
.
Check the system tubing and make sure there is no leakage, especially at the joint connections.
Refrigerant has good permeability, and it also contains a little refrigerant oil. If there is leak, there
will be traces of oil at the leak points.
3
3
.
.
In normal conditions, the interior lamps work along with the doorframe lamps.
