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The 8420 Series defrost control is time-initiated with termination being regulated over a wide range of pressure settings. Cut-in pressures range from 36 to 110 psi.
In addition to the pressure cut-in, the 8240 Series has backup mechanical defrost termination to protect against sensor failure. This timer allows settings from 4 to 110 minutes with two-minute increments. One to six defrost cycles may be set per day with a minimum of four hours between cycle initiation.