If you detect air escaping from the actuator vent hole or if the actuator fails to stroke properly under normal supply pressure

and EX8 valves

Enhanced System Reliability: Maintains consistent HVAC refrigerant flow

It is the definitive solution for contractors performing Lennox furnace repairs where reliable ignition sequence control is paramount

Heil Quaker ICP 1173097 Pan 319825-402 If you detect air escapingThe Heil Quaker ICP 1173097 Pan is a vertical condensate pan engineered specifically for technical compatibility with vertical evaporator coil configurations. As an essential component for moisture management, this replacement condensate pan is built from high grade, corrosion resistant polymers to withstand the constant thermal cycling and high humidity environment within the plenum. In the field, this pan ensures that moisture pulled from the air