Is an external overload relay required with the 3RV2021-1FA10

Reliable performance reduces system downtime and prevents ignition failure codes

Using the incorrect rotation for the spiral spring can cause the coupler to uncoil or fail under load

it integrates with standard HVAC fasteners and threaded rods typically found in unit heater mounting and internal support structures

The Lennox 65W34 requires a 460-volt

Functional Devices RIBMNU1C Relay mario Is an external overload relayThe Functional Devices RIBMNU1C is a reliable SPDT enclosed relay designed for direct panel mounting, offering a versatile solution for pilot duty applications and HVAC control circuits. This 10 Amp power relay features a universal input voltage coil, capable of operating on 10 30 Vac Vdc or 120 Vac, which simplifies inventory by replacing multiple single voltage units. Its Form C contact configuration allows for both normally open and normally closed