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The controller can also be configured with a Temperature Initiated Defrost Function to start defrosting if it senses too great a difference between the
control temperature and the evaporator temperature. Temperature Initiated Defrost Time Delay begins counting down if the evaporator temperature is less
than 32ºF (0ºC) and an excessive temperature difference is sensed. Defrost starts if the temperature difference still exists when the delay expires. This
temperature initiated defrost delay prevents defrost from starting if the air space temperature temporarily increases (e.g. the door is left open). The
temperature difference and delay are both configured.
Temperature Initiated Defrost Time Delay after Defrost begins counting down when refrigeration starts after defrost. This delay is typically longer than
Temperature Initiated Defrost Time Delay to prevent another defrost before the sensed temperatures return to normal. When Temperature Initiated Defrost
Time Delay after Defrost expires, the controller resumes use of Temperature Initiated Defrost Time Delay as described above. Temperature Initiated Defrost
Time Delay after Defrost permits a shorter Temperature Initiated Defrost Time Delay without the risk of starting defrost due to a lagging control temperature
after defrost.
Temperature initiated defrost is independent of time initiated defrost and can start before the Time to subsequent defrosts timer expires.
Type E7 EcoCool™ Electronic Temperature and Defrost Controllers
©2008 Invensys Controls All rights reserved.
DRAFT VERSION
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