Gravity Wall Furnace Install - YouTube Click to view on Bing3:46With self-energizing controls for use during power outages, heavy gauge steel grill to eliminate heat warp, and an optional fan accessory kit, Cozy Gravity Wall Furnaces are a top choice ofAuthor: Cozy Heating Systems, LLCViews: 65K Gravity Furnaces - Structure Tech Home Inspections If you’re buying a home with a gravity furnace, you should have the furnace replaced. Gravity furnaces are those huge ‘octopus’ furnaces that can just about fill up a whole room with ductwork. They are called gravity furnaces because it’s gravity that distributes warm air – How to Wire a Furnace Thermostat With 2 Wires | Hunker Turn off power to the furnace by turning the switch on the side of the furnace to the "off" position. Failure to disconnect power to the furnace before wiring the thermostat can result in damage to the furnace. Follow all other safety instructions as outlined above.Author: Elizabeth Knoll Gravity furnace & 2-wire thermostat - Ask Me Help Desk My sister has an ancient Biltwel Gravity Furnace in her basement that just stopped working. For four years she has just jumpered the thermostat wires upstairs to run the furnace. (Thermostat face completely gone.) There are only two wires coming into the thermostat and NO 110 VAC. In the basement, I can find NO 110VAC going into the unit. I have a old gravity furnace in the basement and it has I have a old gravity furnace in the basement and it has stopped working. I replaced the thermostat with a heat only thermostat for gravity furnaces but it still does not come on. (5-2 day). There is one thermostat in the house. I have knob tube wiring. I hooked up the white wire with the "w" and the black Owner’s Manual S Top-Vent Gravity Wall Furnace PDF fileavailable (either natural or L.P. gas). DO NOT convert the furnace from natural gas to L.P. gas or from L.P. gas to natural gas without the proper manufacturer’s gas conversion kit. Combustion air is drawn in from the room where the furnace is located and is vented out of COZY 90N30A INSTALLATION AND OPERATING INSTRUCTIONS View and Download COZY 90N30A installation and operating instructions manual online. Gas-Fired Vented FLOOR FURNACE. 90N30A Furnace pdf manual download. Also for: 90n50a, 90n65a, 90n75a.