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Featuring a 1/4" SAE flare connection
it is compatible with 5/8" OD glass of various lengths
Its NEMA 1 rated enclosure ensures protection for internal components while the integrated Hand-Off-Auto (HOA) override switch allows for manual circuit testing or emergency bypass without additional wiring
If your heater is short-cycling or the blower continues to run while the heating elements remain cold
If your valve lacks this feature
Lochinvar & A.O. Smith 100208514 Relay 30067439-890 Featuring a 1/4" SAE flareThe Lochinvar & A. O. Smith 100208514 Relay is a critical 24V electromagnetic control designed for precise low voltage circuit switching in commercial and residential hydronic systems. As the direct replacement for RLY2903, this OEM component ensures seamless HVACR system compatibility when interfacing between thermostat controllers and high load mechanical parts. This 24VAC relay is frequently utilized in boiler control boards and water heater wiring
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