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or reduced airflow from your vents
When troubleshooting APS open error codes or blower proving issues
the MEP-4002 is a non-spring return (non-fail-safe) actuator
the signal should scale linearly from 0V at 0 PSI to 10V at 500 PSI when compared against a calibrated mechanical gauge
the three stages engage sequentially at equidistant voltage points to provide proportional heating capacity
Weil McLain 510-811-655 Valve Kit 30067439-890 or reduced airflow from yourThe Weil McLain 510 811 655 Valve Kit is a field proven combination gas control valve engineered for step opening ignition sequences in high efficiency hydronic systems. This 1 2" x 1 2" NPT natural gas valve provides precise pressure regulation, operating from a 0. 9" W. C. low fire setting up to a 3. 5" W. C. high fire output. Designed for compatibility with various Weil McLain boiler parts, this replacement gas valve ensures stable manifold
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