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Universal Compatibility: Replaces older Lennox and Allied Air part numbers including 86H3101
The S1-025-26387-017 is configured for specific York HVAC units
the 100208553 sensor must be swapped
How do I initiate a manual defrost test on this board
McDonnell & Miller 250-1-30 Valve 30067439-890 Universal Compatibility: Replaces older LennoxFor high performance hydronic heating systems, the McDonnell & Miller 250 1 30 (Part Number 181925) is a heavy duty 1" NPT pressure relief valve engineered to protect ASME Section IV pressure vessels. This bronze body relief valve is factory set at 30 PSI and provides a substantial 1,170,000 BTU capacity to prevent over pressure conditions in large scale boiler applications. Designed for maximum durability, it features an EPDM rubber diaphragm and
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