this gas/air arm assembly ensures the correct orientation and alignment of the burner interface

Efficient 9 VA power consumption reduces the load on 24V control transformers

you know that a failing limit switch is often the culprit behind frustrating short cycling or total system lockouts

it features a Viton diaphragm that allows for safe operation with water

Always cross-reference your model and serial number

Greenheck 383557 Relay Base 321702-401 this gas/air arm assembly ensuresThe Greenheck 383557 Relay Base is a critical electrical component designed for high reliability HVAC relay switching and circuit control within commercial and industrial ventilation systems. This SPDT relay base (Single Pole Double Throw) provides the essential interface for standard 5 pin relays, ensuring secure terminal connectivity and simplified HVAC control wiring. Engineered for a broad operational range of 30F to 110F, it is frequently