This unit utilizes a 48 frame (5

or debris in the inducer port before replacing the switch

keeping these HVAC pilot orifices in stock is standard practice for winter prep and emergency unit heater repairs

this unit features a pressure range of 5-100 PSIG and a field-adjustable differential range of 3-12 PSI

Never increase the limit setpoint above the manufacturer's specification

Armstrong Fluid Technology 805188-111 Flange Kit 321894-708 This unit utilizes a 48The Armstrong Fluid Technology 805188 111 Flange Kit is a professional grade solution designed for seamless integration into high performance hydronic and HVAC systems. This 3 inch cast iron flange kit serves as the direct, modernized replacement for the legacy 105188 011 model, ensuring long term reliability and leak free operation. Engineered specifically for circulating pump installation, this kit is compatible with Armstrong Series E. 2 pumps,