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Manual Override: Integrated lever facilitates system flushing and manual operation during service intervals
The A-port provides characterized flow for precise modulation
Enhanced Flame Sensing: The high-output thermopile delivers a stable millivolt signal to prevent premature gas valve closure
Ensure the orifice installed in the P320758 matches the manifold pressure of your fuel source
Without an accurate signal
ZoneFirst SPRD-20X8 Damper 30067439-890 Manual Override: Integrated lever facilitatesThe 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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