The Resideo WT8840A1500 Gas Control is the industry-standard trade replacement for the Honeywell WV8840A1050 and WV8840A1051 series

operating reliably within a pressure range of 5 to 125 PSI

No continuity while the unit is at ambient temperature usually indicates a blown protector that requires replacement

This critical function prevents "nuisance switching" or flickering caused by transient light sources such as car headlights or lightning

the sensor detects ambient air temperature upstream of the burner

Siemens Building Technology 656-0002 Valve 320734-701 The Resideo WT8840A1500 Gas ControlThe Siemens Building Technology 656 0002 Valve is a pneumatic radiator valve engineered for precision fluid management in terminal unit applications such as fan coil units, convectors, and reheat coils. This Siemens Powermite 656 series assembly features a 1 2 inch flare connection and operates in a normally open configuration. Designed to handle both hot chilled water and low pressure steam, the 2. 1 Cv flow coefficient ensures consistent performance