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Duotone terrace — saffron brief on the left, garden-folded ledger on the right.
This board is technically rated for natural gas 1-stage logic but functions as the controller in many field-converted Modine units
non-slip technical connection that maintains calibration over thousands of cycles
3/4" outlet)
this is a dedicated steam pressure relief valve
Dual-temperature control allows for automated night setback
Lochinvar & A.O. Smith 100208661 Flow Switch 320788-704 This board is technically ratedThe Lochinvar & A. O. Smith 100208661 Flow Switch, also identified by part number 781621 or alias FS8 W, is a heavy duty liquid flow switch engineered for precise proof of flow detection in high efficiency commercial boiler systems and water heaters. Designed as a direct HVAC replacement part for the McDonnell & Miller FS8 W, this unit features a durable stainless steel #3 paddle configuration to ensure reliable contact closure once the system pump