Heat pump defrost timer: Ultra low cost. Pin-for-pin compatible with OEM Type 621 controls. Simple time and temperature control. Must have external relays for fan, reversing valve and auxiliary heat. High installed base. INPUT: Voltage: 18 to 30 VAC, Frequency: 50/60 Hz, Power Consumption: 1 watt max. OUTPUT: Type: Relay, Form: SPST, N.O., Rating: 1 amp. TIME DELAYS: Defrost Time: Fixed 10 minutes ±5%, Interval Time between defrosts: Pin-selectable 30/60/90 min, Power on Reset Time: 500ms, Test time: short across test terminals reduces test time 256x.
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