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This UL 508 listed device utilizes a 1/2-inch nipple mount for direct attachment to electrical boxes
using an OEM Tecumseh relay is essential to maintain the calibrated drop-out voltage required for motor winding protection
Manual Override: Integrated lever facilitates system flushing and manual operation during service intervals
The MOPD for this valve is 550 psi when used with a 10W AC coil and 406 psi with a 20W DC coil
ZoneFirst SPRD-20X8 Damper 30067439-890 This UL 508 listed deviceThe ZoneFirst SPRD 20X8 is a heavy duty barometric bypass damper engineered for precise static pressure regulation in multi zone residential and light commercial HVAC systems. This 20" x 8" mechanical unit utilizes a field adjustable weighted arm to facilitate effective bypass air management without the requirement for complex electronic controls or wiring. As zone dampers close and duct pressure rises, the ZoneFirst SPRD 20X8 automatically opens to
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