Spence Engineering D10100 Pilot Freon the 917178A Defrost Control Board

the 917178A Defrost Control Board is the engineered direct replacement for the discontinued 621579

and blower fan delays

supporting system stability even under varying load conditions without the risk of mechanical slippage

ensuring accurate modulation of heating and cooling cycles

Spence Engineering D10100 Pilot Freon the 917178A Defrost Control BoardThe Spence Engineering D10100 Pilot is a heavy duty, cast iron pressure reducing pilot designed for industrial steam, gas, and vapor applications. Engineered for precision and longevity, this normally closed pilot features packless construction to eliminate stem leakage and reduce maintenance overhead. The D Pilot 10 100# spring range provides contractors with an adjustable downstream delivery pressure between 10 and 100 PSIG, making it a versatile