facilitating proper alignment with the thermocouple or thermopile

or a failing inducer motor that isn't pulling enough draft

and Payne part numbers including HC98CA035 and HC98JA036D

it provides an equal percentage flow characteristic on Port A to AB and linear flow on Port B to AB

HK-4460-151-1

Honeywell 312817AA Actuator 30067439-890 facilitating proper alignment with theThe Honeywell 312817AA Actuator is a field proven pneumatic solution engineered for the proportional control of VP512A Series unit ventilator valves. This pneumatic valve actuator assembly features a 3 8 psi spring range and a precise 1 2 inch stroke, making it the industry standard for managing steam and hot water coils in commercial HVAC systems. Designed with a high strength aluminum housing and a resilient Buna N diaphragm, the 312817AA is built