
Dual-Fuel Heat Pump + Modulating Furnace Install
Installed a Carrier Infinity 80k BTU furnace with a 3-ton 27VNA036 R454B heat pump and CAAMP3721AMA coil. Reused the lineset, built a new plenum, added a GFCI, and moved the disconnect. Verified gas, added 1 lb 5 oz refrigerant, converted to two-pipe venting, and confirmed full system operation.







