The Johnson Controls A-4000-138 is a professional-grade remote mounted pressure reducing station engineered to maintain precise pneumatic control system performance

verify compatibility as spring rates and diaphragm counts may differ

How do I verify if the 24V coil is failing

Most technicians will require a standard socket set

this component features a precise 145°F opening temperature to interrupt the burner circuit upon detecting an overheat condition

Carrier HC41FB666 Motor 319848-301 The Johnson Controls A-4000-138 isThe Carrier HC41FB666 Motor is a high performance 1 3 HP blower motor designed for professional HVAC applications requiring 208 230V power. Operating at a fixed 1550 RPM, this OEM Carrier replacement motor ensures optimal static pressure performance and consistent airflow within residential and light commercial air handlers and furnaces. Featuring a durable rolled steel frame and thermal overload protection, it is built to handle the rigorous duty