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inspect the blower motor for proper RPM
it is rated for a maximum boiler pressure of 50 PSI
this unit is the engineered direct replacement for the 1403612
model (like the 71488512) will invert your system logic
As a 24VAC proportional actuator
Spence E-3-250 Valve Els PW 29614 inspect the blower motor forThe Spence E 3 250 is a heavy duty, 3 inch pilot operated main valve designed for high capacity steam pressure regulation in industrial and commercial HVACR systems. Built with a rugged cast iron body and featuring 250# flange connections, this normally closed valve is engineered to handle a maximum inlet pressure of 250 PSIG at temperatures up to 450F. Its packless construction and balanced metal diaphragms eliminate the friction associated with
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