Refrigerating Systems. Defrost controllers

Defrost controller with timer (Fig. 3.27) carries out various control valves and fan relay for fast and effective removal of frost and ice buildup from the surface of the evaporator. There are four easy-to-set defrost steps:

Pump,
Hot gas,
Equalize, and
Fan delay.

This controller uses a reliable, solid-state electronics with precision quartz watch time and time interval setting slide the handle to consistently work through four steps to a smooth thawing. Each step is clearly indicated by bright LED during operation. Terminals for connecting additional sensor defrost initiation and termination. 24-hour quartz watch facilitates easy installation in 15-minute increments defrost the beginning of time. 7-day quartz watch for weekly scheduling is also available. All the time clock 72-hour battery backup in case of momentary power failure. Because his time is adjustable 4-step defrost, this controller is designed to defrost almost every application, including the upper and lower feed coolers, shock freezing evaporators, ice generators and other

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