it is recommended to inspect the potential relay when replacing the Lennox 21J29

It slips over the existing unit and locks to the wall housing

5" WC output setting and a standard 1/2" NPT inlet/outlet

Where is this part typically used

the HC39AZ231 induction motor simplifies field replacements with its standard 1

Armstrong Fluid Technology 116515-136A Pump 321894-708 it is recommended to inspectThe 116515 136A is a high performance Armstrong Fluid Technology 116515 136A Pump, specifically engineered for demanding hydronic heating and cooling systems. As a powerful 3 phase circulator pump, this model (H67BF) delivers a robust 1 HP output and operates at 208 230 460Vac, making it an ideal solution for commercial HVAC pump applications and multi stage zoning. This unit serves as the direct, updated replacement for the legacy 116515 136 model.