Abstract

A portable indirect fuel fired heater includes a burner assembly having a fuel burner to deliver fuel from a fuel supply to a combustion chamber of the heater and a combustion air blower to deliver combustion air to the combustion chamber with the fuel for combustion in the combustion chamber to produce exhaust gases. A heat exchanger receives air to be heated in heat exchanging relationship with at least a portion of the combustion chamber. A sensor senses an oxygen level as a partial pressure of oxygen in the exhaust gases. A controller operates an actuator operatively connected to the burner assembly to controllably vary the delivery rate of combustion air and thus vary the ratio of the air and fuel responsive to the oxygen level sensed by the combustion sensor so as to maintain the sensed oxygen level at a prescribed set point level stored on the controller.

IPC Classes  ?

• F24H 3/06 - Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators
• F24H 9/00 - FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL - Details
• F24H 9/1881 - Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
• F24H 9/20 - Arrangement or mounting of control or safety devices
• F23N 5/00 - Systems for controlling combustion
• F24H 3/04 - Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
• F24H 3/08 - Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators by tubes

Abstract

A portable indirect fuel fired heater includes a burner assembly having a fuel burner to deliver fuel from a fuel supply to a combustion chamber of the heater and a combustion air blower to deliver combustion air to the combustion chamber with the fuel for combustion in the combustion chamber to produce exhaust gases. A heat exchanger receives air to be heated in heat exchanging relationship with at least a portion of the combustion chamber. A sensor senses an oxygen level as a partial pressure of oxygen in the exhaust gases. A controller operates an actuator operatively connected to the burner assembly to controllably vary the delivery rate of combustion air and thus vary the ratio of the air and fuel responsive to the oxygen level sensed by the combustion sensor so as to maintain the sensed oxygen level at a prescribed set point level stored on the controller.

IPC Classes  ?

• F24H 15/33 - Control of dampers
• F23N 3/00 - Regulating air supply or draught
• F24D 5/02 - Hot-air central heating systems; Exhaust-gas central heating systems operating with discharge of hot air into the space or area to be heated
• F24H 3/02 - Air heaters with forced circulation

Abstract

An auxiliary duct is supported on the housing of an indirect fired heater of the type having separate heated air and combustion passages. The auxiliary duct extends between an inlet end at the heated air discharge to an outlet end adjacent a burner assembly at the combustion inlet so as to be arranged to direct a portion of the flow of air heated by the heater towards components of the burner assembly including fuel lines, a fuel pump, a fuel filter and a combustion air intake blower for heating the burner assembly and associated components to improve the operation thereof in colder climates.

IPC Classes  ?

• F24H 3/00 - Air heaters
• F23L 15/00 - Heating of air supplied for combustion
• F24H 3/06 - Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators
• F24D 5/02 - Hot-air central heating systems; Exhaust-gas central heating systems operating with discharge of hot air into the space or area to be heated
• F24D 15/02 - Other domestic- or space-heating systems consisting of self-contained heating units, e.g. storage heaters

Abstract

An auxiliary duct is supported on the housing of an indirect fired heater of the type having separate heated air and combustion passages. The auxiliary duct extends between an inlet end at the heated air discharge to an outlet end adjacent a burner assembly at the combustion inlet so as to be arranged to direct a portion of the flow of air heated by the heater towards components of the burner assembly including fuel lines, a fuel pump, a fuel filter and a combustion intake blower for heating the burner assembly and associated components to improve the operation thereof in colder climates.

IPC Classes  ?

• F24D 15/02 - Other domestic- or space-heating systems consisting of self-contained heating units, e.g. storage heaters
• F23L 15/00 - Heating of air supplied for combustion
• F24D 5/02 - Hot-air central heating systems; Exhaust-gas central heating systems operating with discharge of hot air into the space or area to be heated
• F24H 3/06 - Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators

Goods & Services

(1) Portable oil and gas fuelled heaters.

Goods & Services

(1) Portable oil and gas fuelled heaters.

Goods & Services

(1) Portable oil and gas fuelled heaters.

Goods & Services

(1) Portable oil fired/propane or natural gas fired vented heaters.

Goods & Services

Portable Oil-Fired Space Heaters for Construction Application