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SYSTEM OPERATION
Defrosting Procedure Screen
TP04300 Series Interface & Applications Manual 3-31
Defrost Procedure
CAUTION
CAUTION 7: During the defrost cycle, the defrost melt water will eventually be forcibly
ejected from the main air output nozzle. Therefore position the nozzle away from the tester or
any other electronic components.
Defrosting permits recovery from a “freeze-up” condition created when moisture in the air
supply is allowed to enter the heat exchanger of the air chiller where it condenses and freezes.
A diminishing air flow at the head nozzle for a set value of air flow indicates a freeze-up
condition.
When freeze-up occurs, determine what has failed and is allowing moisture to enter the heat
exchanger.
Check in this order (see Chapter 5 for detail):
1. Particle Filter: empty if necessary
2. Coalescing Filter: empty if necessary
3. Air dryer Post Filter: empty if necessary
4. Air dryer operation.
When the defrost cycle is initiated:
1. The compressor (air chiller module) is turned off.
2. The system will not permit temperature control.
3. The air flow through the system will continue to force air through the heat exchanger to
aid in the defrosting and to remove moisture from the heat exchanger.
ATTENTION
Although the defrost cycle can be aborted at any time and the system returned to normal
temperature control operation, if the moisture in the heat exchanger is not removed, or if
moisture continues to enter the heat exchanger, then the freeze-up will reoccur.
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