Patent ID: 9651256
Date: 2017-05-16
CPC Classifications: F23D,F23N,F24H,Y10T

Claim:
1. A gravity-style furnace subunit, comprising: a heat conduction tube configured to be located inside a cabinet of a gas-induced draft furnace, the heat conduction tube being separated from: a second different burner assembly having a burner tube located within the heat conduction tube through an inlet opening of the heat conduction tube, wherein the second burner assembly permits air flow through the inlet opening into the heat conduction tube; a pilot assembly located within the heat conduction tube and adjacent to the burner tube; a thermopile module located adjacent to a flame outlet of the pilot assembly within the heat conduction tube; and a gas valve configured to control gas flow to the second burner assembly, wherein: wherein the gravity-style subunit and the draft-induced heat conduction tubes comprise separate air inlets and separate combustion outlets and wherein the heat conduction tube is operable to use gravity to facilitate the circulation of air heated by the gravity-style subunit when external electrical power is unavailable.