this Apollo 19 series valve meets strict National Board capacity certifications

and the spring-return time is also typically under 15 seconds for rapid fire safety response

supporting any 120 VAC burner application under 400K BTU

If the primary side has line voltage but the secondary side is 0V

The Armstrong International D506503 Repair Kit

York 025-35780-003 Sensor 319852-301 this Apollo 19 series valveThe York 025 35780 003 Sensor is a high precision 17ft averaging sensor engineered for industrial HVAC applications requiring exact temperature feedback across a wide area. As a crucial component in stratified air management, this York OEM replacement part utilizes a resistive temperature device (RTD) or multi point thermistor assembly to calculate a mean temperature value, preventing the short cycling and control errors common with single point