the command relay requires a 24VAC/VDC external supply for coil operation

When replacing one with the other

including B and E 100 series units

Universal Locking Design: Prevents unauthorized setpoint adjustments

Armstrong Furnace AEHBCC05CSA-1 Heat Strip Kit Els PW 17895 the command relay requires aThe Armstrong Furnace AEHBCC05CSA 1 Heat Strip Kit is a professional grade 5kW electric heater accessory designed for seamless integration into HVAC air handler systems. Engineered by Allied Air Enterprises, this 5kW electric heat kit serves as a reliable supplemental heat source for heat pump applications or as primary emergency heat in compatible blower coils. Operating at 208 230V single phase (1PH), this unit provides precisely 17,000 BTU hr (at