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verify the vented draft inducer and heat exchanger integrity before replacing the furnace control module
Verify the wiring terminal count on the existing valve head before installation
The most common symptom is the furnace or RTU lighting for several seconds and then immediately shutting down
What air quality is required for long-term reliability
Spence Engineering D550 Pilot 30067439-890 verify the vented draft inducerThe Spence Engineering D550 Pilot is a heavy duty, spring operated pressure pilot designed to interface with Type E and Type C main valves for high accuracy steam regulation. Constructed with a rugged cast iron body, this normally closed pilot is specifically engineered for secondary pressure control in steam heating systems and industrial vapor applications. It features a 5 50 PSI spring range, allowing contractors to field adjust delivery setpoints
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