Overview
Fast, efficient, positive defrosting of evaporators
Complete factory pre-piping of all valves
Utilizes the existing liquid line as the hot-gas pipe
Factory installed defrost-termination and fan-delay pressure controls
Pre-heated evaporator drain pan
Maximum compressor protection

OPERATION CYCLES:

Refrigeration


Defrost

(A) room thermostat   (B) liquid line solenoid valve   (C) low pressure control 
(D) de-energized 3-Way valve  (E) opened check valve (F) TXV (Thermostatic expansion valve)   
(G) closed checkvalve   (H) crankcase pressure regulator   (I) a timeclock   (J) drain pan heater   
(K) hot gas solenoid valve   (L) 3-way valve pressure control   
(M) defrost termination pressure control   (N) Fan delay control. 

The refrigeration Cycle
The Defrost Cycle