The Goodman AFE18-60A Dual Fuel Control Board is designed for use in heat pump applications where the indoor coil is located above/downstream of a gas or fossil fuel furnace. It will operate with single and two stage heat pumps and single and two stage furnaces.
The AFE18 control will turn the heat pump unit off when the furnace is turned on. An anti-short cycle featur is also incorporated which initiates a 3 minute timed off delay when the compressor goes off. On initial power up or loss and restoration of power, this 3 minute timed off delay will be initiated. The compressor wont be allowed to restart until the 3 minute off delay has expired. Also included is a 5 second de-bounce feature on the Y, E, W1 and O inches thermostat inputs.
These thermostat inputs must be present for 5 seconds before the AFE18 control will respond to it. An optional outdoor thermostat, OT18-60A, can be used with the AFE18 to switch from heat pump operation to furnace operation below a specific ambient temperature setting, (i.e. break even temperature during heating). When used in this manner, the Y inches heat demand is switched to the W1 inches input to the furnace by the outdoor thermostat and the furnace is used to satisfy the first stage Y inches heat demand.