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Precise Proportional Control: The 3-7 psi nominal spring range allows for accurate positioning throughout the full damper stroke
maintaining the precise static pressure required to close the pressure switch and initiate the ignition sequence
Code Compliance: Fully meets ASME Section IV standards for safety and reliability in boiler systems
making it a reliable solution for retrofitting older heating systems
and FX4D series air handlers
Modine 5H0730570008 Switch 321894-709 Precise Proportional Control: The 3-7The Modine 5H0730570008 Blocked Vent Switch is a critical safety component engineered to monitor exhaust integrity in Modine gravity vent heaters, including PA, PAE, and PD series units manufactured after 1986. Functioning as a high limit spill switch, this manual reset device detects flue gas spillage caused by downstream obstructions or inadequate draft. By monitoring temperatures within the draft diverter, it interrupts the 24V control circuit to
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