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**NOTE: Case (# A1461) is not included with this timer. Must be purchased separately.

  • Frequency of defrost is one to six cycles per day. A minimum of four hours between successive defrost cycles.
  • Adjustable back-up defrost termination from four-110 minutes in two minute increments.
  • Control works with an external temperature or pressure sensor.
  • Choice of three contact arrangements for electric heat, compressor shutdown or hot gas defrost.
  • Positive switch action slider bar.
  • Switch ratings per pole: 40 amp, 2 hp, 690 VA pilot duty, 120-240 volts AC.
  • Heavy steel enclosure. Gray finish. Knockouts at bottom, back and sides. Hasp and staple for padlock. Available on bracket for sub-panel mounting.
  • Operating voltage: 120 or 208-240 volt, 60 Hz (50 Hz - see chart below).
  • Heavy duty, synchronous industrial type motor.

    First transfer after refrigeration cycle: (A633-20)
  • 2-4 remains closed (compressor).
  • 1-3 opens (fan).
  • 3-N remains open (heaters).

    Second transfer:
  • (3-6 minutes after the first)
  • 2-4 opens (compressor).
  • 1-3 remains open (fan).
  • 3-N closes (heaters).
  • Shipping weight = 3-3/4 lb. (1.7 kg.).
  • Control supplied with 4 dial pins. Extra pins, part number X-3596.
Read more
Contacts 1-3:
Contacts 2-4:
Contacts 3-N:
Time Initiated Pressure or Temperature Terminated
Defrost Cycles:
Special Holiday
Special Hours
8am–5pm ET
Mon – Fri, 7AM – 6PM

In observance of Memorial Day, Pickup will be closed:
Monday, May 25 and reopen at 7AM on Tuesday, May 26.
Closed Now: Phone Hours
Monday – Thursday
8am–7:45pm ET
8:30am–7:45pm ET

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