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InspectAPedia ® Home HEATING SYSTEMS AFUE DEFINITION, RATINGS AGE of CHIMNEYS & FIREPLACES AGE of HEATERS, BOILERS, FURNACES AIR FILTERS for HVAC SYSTEMS AIR HANDLER / BLOWER UNITS AIRBOUND HEAT SYSTEM REPAIRS ANODES & DIP TUBES on WATER HEATERS ANTIFREEZE for BOILERS ANTI SCALD VALVES APPLIANCE EFFICIENCY RATINGS ASBESTOS IDENTIFICATION IN buildings BACKDRAFTING HEATING EQUIPMENT BACKFLOW PREVENTER VALVE, HEATING SYS BACKFLOW PREVENTER, HEATER WATER FEEDER BACKUP HEAT for HEAT PUMPS BANGING HEATING PIPES RADIATORS BAROMETRIC DAMPERS BASEBOARD HEAT BLEVE EXPLOSIONS BLOWER FAN CONTINUOUS OPERATION BLOWER FAN OPERATION & TESTING BLUE vs YELLOW COMBUSTION FLAMES BLUERAY Recall BOILERS, HEATING BOILER CHEMICAL TREATMENTS BOILER COMPONENTS & PARTS BOILER CONTROLS & SWITCHES BOILER LEAKS CORROSION STAINS BOILER NOISE SMOKE ODORS BOILER OPERATING PROBLEMS BOILER PRESSURE & TEMPERATURE SETTINGS BOOKSTORE - InspectAPedia BTU USAGE MONITORS CAPACITORS for HARD STARTING MOTORS CARBON DIOXIDE - CO2 CARBON MONOXIDE - CO CHEMICAL TREATMENTS for BOILERS CHIMNEY INSPECTION DIAGNOSIS REPAIR CIRCULATOR PUMPS & RELAYS COOL OFF HEAT, Thermostat Switch COMBUSTION AIR COMBUSTION AIR for TIGHT buildings COMBUSTION GASES & PARTICLE HAZARDS COMBUSTION PRODUCTS & IAQ COMPLETE COMBUSTION, Stoichiometric CREOSOTE FIRE HAZARDS CONDENSING BOILERS/FURNACES CONVECTOR HEATERS - HYDRONIC COILS DEFINITION of Heating & Cooling Terms DEHUMIDIFICATION PROBLEMS DEW POINT CALCULATION for WALLS DEW POINT TABLE - CONDENSATION POINT GUIDE DIAGNOSE & FIX HEATING PROBLEMS-BOILER DIAGNOSE & FIX HEATING PROBLEMS-FURNACE DIRECT VENTS / SIDE WALL VENTS DRAFT HOODS - gas fired DRAFT MEASUREMENT, CHIMNEYS & FLUES DRAFT REGULATORS, DAMPERS, BOOSTERS DUCT SYSTEM & DUCT DEFECTS ELECTRIC HEAT, DIAGNOSIS, REPAIR ELECTRIC MOTOR DIAGNOSTIC GUIDE ELECTRIC MOTOR OVERLOAD RESET SWITCH ELECTRICAL POWER SWITCH FOR HEAT FAN, AIR HANDLER BLOWER UNIT FAN AUTO ON Thermostat Switch FAN CONVECTOR HEATERS - HYDRONIC COILS FAN LIMIT SWITCH FAN NOISES FILTERS, AIR for HVAC SYSTEMS FILTERS, OIL on HEATING EQUIPMENT FIRE SAFETY CONTROLS FIREPLACES & HEARTHS FLAME COLOR, BLUE vs YELLOW COMBUSTION FLOODED HEATING EQUIPMENT REPAIR FLUE SIZE SPECIFICATIONS FLUE VENT CONNECTORS FUEL OIL TYPES & CHARACTERISTICS FUEL UNIT, HEATING OIL PUMPS FURNACES, HEATING FURNACE CONTROLS & SWITCHES FURNACE HEAT EXCHANGER LEAKS FURNACE OPERATION DETAILS FURNACE OPERATING TEMPERATURES GALVANIC SCALE & METAL CORROSION GAS BURNER Flame & Noise Defects GAS FIRED WATER HEATERS GAS PIPING, VALVES, CONTROLS GAUGES ON HEATING EQUIPMENT GEOTHERMAL HEATING SYSTEMS HEAT EXCHANGER LEAK TEST HEAT LOSS in BUILDINGS HEAT LOSS INDICATORS HEAT LOSS PREVENTION PRIORITIES HEATING COST FUEL & BTU Cost Table HEATING COST SAVINGS METHODS HEATING LOSS DIAGNOSIS-BOILERS HEATING LOSS DIAGNOSIS-FURNACES HEATING OIL PIPING TROUBLES HEATING OIL TANKS HEATING OIL TYPES & PROPERTIES HEATING OIL USAGE RATE HEATING SMALL LOADS HEATING SYSTEM NOISES HEATING SYSTEM TYPES HIGH EFFICIENCY BOILERS/FURNACES HOT WATER HEATERS HUMIDITY LEVEL TARGET LOW VOLTAGE BUILDING WIRING LOW VOLTAGE TRANSFORMER TEST LP & Natural Gas Safety Hazards MANUALS & PARTS GUIDES - HVAC MIXING / ANTI-SCALD VALVES MOTOR OVERLOAD RESET SWITCH Natural Gas Combustion NO HEAT - BOILER NO HEAT - FURNACE NOISE, DUCT VIBRATION DAMPENERS NOISE, HEATING SYSTEMS NOISE, WATER HEATER ODORS & SMELLS DIAGNOSIS & CURE ODORS FROM HEATING SYSTEMS OIL BURNERS OIL BURNER FUEL UNIT OIL BURNER INSPECTION & REPAIR OIL BURNER NOISE SMOKE ODORS OIL BURNER NOZZLE & ELECTRODES OIL BURNERS, RETENTION HEAD OIL BURNER SOOT & PUFFBACKS OIL FILTERS on HEATING EQUIPMENT OIL FILTER MISSING OIL FUEL TYPES & CHARACTERISTICS OIL HEAT FIRE SAFETY CONTROLS OIL LINE CLOGGING FIX OIL LINE QUICK STOP VALVES OIL LINE SAFETY VALVES OIL ODORS, LEAKY OIL TANK PIPING OIL PUMP FUEL UNIT OIL SPILL CLEANUP / PREVENTION OIL TANKS PLASTIC HEATER VENT PULSE COMBUSTION HEATERS PRESSURE REDUCING VALVES PRESSURE REGULATOR, WATER RADIANT HEAT RADIANT HEAT Floor Mistakes to Avoid RADIANT HEAT TEMPERATURES RADIANT SLAB FLOORING CHOICES RADIANT SLAB TUBING & FLUID CHOICES RADIATORS RELIEF VALVE LEAKS RELIEF VALVES - TP Valves on Boilers RELIEF VALVES - STEAM TP VALVES RELIEF VALVES - Water Heaters RELIEF VALVES - Water Tanks Reset Switch - Heater Primary Control Reset Switch Broken - Quick RepaiR RESET SWITCH - ELECTRIC MOTOR Reset Switch - Stack Relays SAFETY, HEATING INSPECTION SAFETY RECALLS, Chimneys, Vents, Heaters SOLAR HEATING SYSTEM DESIGNS SOOT on OIL FIRED HEATING EQUIPMENT SPILL SWITCHES - Flue Gas Detection SPLIT SYSTEM AIR CONDITIONERS & HEAT PUMPS STACK RELAY SWITCHES STAIN DIAGNOSIS on BUILDING INTERIORS STEAM HEATING SYSTEMS TANKLESS COILS THERMAL EXPANSION of HOT WATER THERMAL EXPANSION of MATERIALS THERMAL MASS in BUILDINGS THERMAL TRACKING & HEAT LOSS THERMOSTATS, HEATING / COOLING THERMOSTATS, WATER HEATER THERMOSTATIC EXPANSION VALVES Transite Pipe Chimneys & Flues VIDEO GUIDES: Heating System Videos VIDEO GUIDES - InspectAPedia.com WATER HEATERS WATER HEATER SAFETY WATER HEATERS for HOME HEATING USE? WATER HEATER NOISES WATER HEATER SCALE - De-Liming Procedure WATER HEATER SCALE PREVENTION WINTERIZE A BUILDING WOOD, COAL STOVES & FIREPLACES WOOD STOVE SAFETY ZONE DAMPERS ZONE VALVES More Information |
Combustion air defects & hazards: this article explains how to recognize and fix combustion air defects on heating appliances such as boilers, furnaces, and water heaters. Lack of adequate combustion air causes improper heater operation, increased maintenance cost, and risks dangerous production of carbon monoxide gas. This article series explains how to recognize & diagnose problems with residential heating boilers, including loss of heat, heating boiler noises, leaks, odors, or smoke, and high heating costs. This website answers most questions about central hot water heating system troubleshooting, inspection, diagnosis, and repairs. Also see Combustion Air Defects where we list symptoms of lack of adequate combustion air for oil fired heating equipment. Green links show where you are. © Copyright 2013 InspectAPedia.com, All Rights Reserved. Author Daniel Friedman. How to Recognize & Diagnose Inadequate Combustion Air, Sooting, or Burn Marks at Oil-Fired or Gas-Fired Heating Systems
If you have no heat and need help diagnosing the cause, see HEATING LOSS DIAGNOSIS-BOILERS or HEATING LOSS DIAGNOSIS-FURNACES. Our photo at page top shows an oil fired furnace installed in a closet with an airtight door; there was no outside combustion air supply. The heating system could not work properly nor safely in this home. Watch out: inadequate combustion air supply to a gas burner (and less often to an oil burner) is very dangerous and can produce potentially fatal carbon monoxide. If you suspect unsafe heating system operation or a carbon monoxide problem be sure everyone leaves the building immediately and then call your local fire department for assistance. COMBUSTION AIR for TIGHT buildings explains how to provide outside combustion air for tight buildings. See COMBUSTION GASES & PARTICLE HAZARDS for an explanation of the dangers of inadequate combustion air. See COMBUSTION PRODUCTS & IAQ for the relationship between fuel burning appliances and building indoor air quality. More about carbon monoxide - CO - is at CARBON MONOXIDE - CO and at CARBON MONOXIDE WARNING. Also see the safety warnings at BACKDRAFTING HEATING EQUIPMENT. The photograph shows a heating furnace with soot blow-back around the oil burner probably means there is backpressure in the combustion chamber - an improper operating condition that may be unsafe. Contact us to suggest text changes and additions and, if you wish, to receive online listing and credit for that contribution. List of Clues Indicating Possible Lack of Combustion Air & Related Safety HazardsLack of adequate combustion air can be indicated by or can result in these heating system operating and safety worries:
Also see
Unsafe Air Conditioning or Heating Duct Openings which describes the risks of
reduced combustion air on hot air heating systems when certain return air duct defects are present, and also see
CARBON MONOXIDE - CO and CHIMNEY INSPECTION DIAGNOSIS REPAIR Guide to a Simple Combustion Air Safety Check for Gas Fired Heating AppliancesThanks to Tjernlund Products who recommended this procedure, we describe a simple combustion air safety check that can be performed by a homeowner or by a heating service technician. This procedure is only intended for buildings where LP gas or natural gas heating appliances (heating boiler, warm air furnace, water heater) are installed AND where a flue gas spillage safety switch such as a Tjernlund UC1 Universal Control, MAC1E or MAC4E auxiliary controls for gas fired equipment or Field Controls Gas Spillage Sensing Kit Model GSK-3, GSK-4, GSK-250M switches are installed on those appliances. (Similar products are provided by other manufacturers.)
SAFETY WARNING: If AT ANY TIME your gas fired equipment has shut down in SAFETY OFF position it may be due to a resettable flue gas spill sensor switch. Check with your heating service company - you might think you can avoid a costly heating service call, BUT BEWARE: because flue gas spillage is very dangerous, including the production of potentially fatal carbon monoxide gas, don't simply reset the system without finding out what caused the problem in the first place. MORE SAFETY WARNINGS: in addition to our safety warning above, Tjernlund explains that flue gas safety switches are intended to alert the building occupants to a potentially dangerous condition. But flue gas spillage safety switches are not a substitute for a regular chimney safety inspection nor do they replace regular heating appliance inspection and maintenance by a trained technician. Those steps must be taken as well. What causes flue gas spillage:Please see SPILL SWITCHES for a discussion of the causes of flue gas spillage in buildings and for a description that contrasts inadequate combustion air with other causes of dangerous flue gas leakage into buildings. Bachrach Corporation, a manufacturer of heating system test equipment opines that gas fired equipment is more likely to have flue gas spillage from a blocked chimney than from building depressurization due to inadequate combustion air supply. We're not sure what data supports that view. Certainly home inspectors find many heating appliances installed in tiny closets with no outside combustion air and a door that, when shut, blocks off air to the appliance. We have also observed that gas fired heating equipment operated just fine in a building until a new owner installed a whole house ventilation fan system. Combustion Air Defects & Safety Hazards at Mobile Home Heating SystemBelow our photographs illustrate several unsafe conditions at a house trailer's heating system. There are no return air flow from the conditioned (occupied) space to the furnace warm air intake, questions about adequate combustion air, and dirt blocked air flow passages.
Combustion Air for Woodstoves - How is It Provided?The link to the original Q&A article in PDF form immediately below is followed by an expanded/updated online version of this article.
The question-and-answer article below paraphrases, quotes-from, updates, and comments an original article from Solar Age Magazine and written by Steven Bliss. Question: how do I provide combustion air for a woodstove?I've often read about the necessity of providing combustion air to a woodstove, but there's usually not much explanation of how it's done. Is it just a pipe that ends near the stove inlet? - Chris Rich, New Castle VA Answer: hard-ducted outside combustion air required for some woodstoves - in manufactured housingMany wood-stove manufacturers provide a special line of stoves intended for manufactured housing. These woodstoves must have an external combustion-air inlet hard-ducted directly into the stove. Often the combustion air supply duct comes up through the floor under the woodstove (or coal stove or airtight wood-burning fireplace), making it almost invisible from inside the room where the woodstove is located. This makes it attractive for the homeowner, and easy for the builder to install. A Guide to Combustion-Air-Related Heating Equipment Malfunctions & Their Implications
Frequently Asked Questions (FAQs)... Ask a Question or Search InspectApediaQuestions & answers or comments about combustion air requirements and safety hazards for oil and gas fired heating appliances Ask a Question or Enter Search Terms in the InspectApedia search box just below. Technical Reviewers & ReferencesRelated Topics, found near the top of this page suggest articles closely related to this one.
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