the Zonefirst SPRD-18 is compatible with vertical installations

this single-speed unit provides a precise fit for specific York

securing the long-term reliability of your air conditioning or heat pump system

000 feet or more above sea level to account for reduced oxygen and air density

If your unit was originally equipped with an electronic control

Watts 0275464 Valve 320734-701 the Zonefirst SPRD-18 is compatibleProfessional grade Watts 0275464, a high capacity Series 174A boiler pressure relief valve, is engineered for critical overpressure protection in large scale hot water heating and domestic supply systems. Constructed with a heavy duty bronze body and a rugged stainless steel spring, this 1 inch NPT valve is factory set to a 150 psi pressure relief setting and delivers a high volume discharge capacity of 3,795,000 BTU hr. The 174A series utilizes a non