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InspectAPedia ® Home HEATING SYSTEMS AFUE DEFINITION, RATINGS AGE of CHIMNEYS & FIREPLACES AGE of AIR CONDITIONERS & HEAT PUMPS AGE of HEATERS, BOILERS, FURNACES AIR CONDITIONING & HEAT PUMP SYSTEMS AIR FILTERS for HVAC SYSTEMS APPLIANCE EFFICIENCY RATINGS ASBESTOS IDENTIFICATION IN buildings BACKDRAFTING HEATING EQUIPMENT BAROMETRIC DAMPERS BLOWER FAN CONTINUOUS OPERATION BLOWER FAN OPERATION & TESTING BLUE vs YELLOW COMBUSTION FLAMES BLUERAY Recall BOILERS, HEATING BOOKSTORE - InspectAPedia BTU USAGE MONITORS BUILDING SAFETY HAZARDS GUIDE CAPACITORS for HARD STARTING MOTORS CARBON DIOXIDE - CO2 CARBON MONOXIDE - CO CHEMICAL TREATMENTS for BOILERS CHIMNEY INSPECTION DIAGNOSIS REPAIR CHIMNEYS & Flues - Asbestos Transite Pipe CHINESE DRYWALL HAZARDS 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 Curved Brick Chimneys - Sulphation CONDENSING BOILERS/FURNACES CONDENSING BOILERS/FURNACES DAMAGE CONVECTOR HEATERS - HYDRONIC COILS DEFINITION of Heating & Cooling Terms DIAGNOSE & FIX AIR CONDITIONER / HEAT PUMP DIAGNOSE & FIX HEATING PROBLEMS-BOILER DIAGNOSE & FIX HEATING PROBLEMS-FURNACE DIRECT VENTS / SIDE WALL VENTS DIRECTORY of OIL TANK EXPERTS DRAFT HOODS - gas fired DRAFT MEASUREMENT, CHIMNEYS & FLUES DRAFT REGULATORS, DAMPERS, BOOSTERS DUCT SYSTEM & DUCT DEFECTS DUST, HVAC CONTAMINATION STUDY DUST SAMPLING PROCEDURE ELECTRIC HEAT, DIAGNOSIS, REPAIR ELECTRIC MOTOR DIAGNOSTIC GUIDE ELECTRIC MOTOR OVERLOAD RESET SWITCH ELECTRICAL POWER SWITCH FOR HEAT EVAPORATIVE COOLING SYSTEMS FAN, AIR HANDLER BLOWER UNIT FAN AUTO ON Thermostat Switch FAN, COMPRESSOR/CONDENSER UNIT 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 FLOODED WATER HEATER REPAIR FLUE SIZE SPECIFICATIONS FLUE VENT CONNECTORS FREEZE-PROOF A BUILDING FUEL OIL TYPES & CHARACTERISTICS FUEL UNIT, HEATING OIL PUMPS FURNACES, HEATING FURNACE CONTROLS & SWITCHES FURNACE EFFICIENCY, HIGH vs MID 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 DETECTION TOOLS HEAT LOSS INDICATORS HEAT LOSS PREVENTION PRIORITIES HEAT LOSS R U & K VALUE CALCULATION HEAT PUMPS, DIAGNOSIS, REPAIR HEAT TAPES & CABLES on Roofs for Ice Dams HEATING COST FUEL & BTU Cost Table HEATING COST SAVINGS METHODS HEATING LOSS DIAGNOSIS-BOILERS HEATING LOSS DIAGNOSIS-FURNACES HEATING OIL CLOUD WAX GEL POINT HEATING OIL EXPOSURE HAZARDS, LIMITS HEATING OIL - OLD, USEABLE? HEATING OIL PIPING TROUBLES HEATING OIL SHELF LIFE HEATING OIL SLUDGE HEATING OIL USAGE RATE HEATING SMALL LOADS HEATING SYSTEM INSPECT DIAGNOSE REPAIR HEATING SYSTEM NOISES HEATING SYSTEM SERVICE & MAINTENANCE HEATING SYSTEM TYPES HIGH EFFICIENCY BOILERS/FURNACES INSULATION INSPECTION & IMPROVEMENT LOW VOLTAGE BUILDING WIRING LOW VOLTAGE TRANSFORMER TEST LP & Natural Gas Safety Hazards MANUALS & PARTS GUIDES - HVAC MOTOR OVERLOAD RESET SWITCH Natural Gas Combustion Products NO HEAT - BOILER NO HEAT - FURNACE NOISE / SOUND DIAGNOSIS & CURE NOISE AIR CONDITIONER / HEAT PUMP NOISE, DUCT VIBRATION DAMPENERS NOISE, HEATING SYSTEMS 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 PASCAL CALCULATIONS RADIANT HEAT RELIEF VALVES - TP Valves on Boilers Reset Switch - Heater Primary Control Reset Switch Broken - Quick Repair RESET SWITCH - ELECTRIC MOTOR Reset Switch - Stack Relays SAFETY HAZARDS & INSPECTIONS SAFETY HAZARDS GUIDE 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 Cracking of Brick THERMAL EXPANSION of HOT WATER THERMAL EXPANSION of MATERIALS THERMAL IMAGING, THERMOGRAPHY THERMAL MASS in BUILDINGS THERMAL TRACKING & HEAT LOSS THERMOSTATS, HEATING / COOLING THERMOSTATIC EXPANSION VALVES Transite Pipes, Chimneys & Flues WINTERIZE A BUILDING WOOD, COAL STOVES & FIREPLACES WOOD STOVE SAFETY ZONE DAMPERS More Information |
Furnace operating controls & switches: this article explains how to identify & set or adjust the controls and switches found on warm air heating furnace systems. This article series answers most questions about central heating system controls and switches: troubleshooting, inspection, diagnosis, and repairs. We describe how to inspect, troubleshoot and repair heating and air conditioning systems to inform home owners, buyers, and home inspectors of common heating system defects. Green links show where you are. © Copyright 2013 InspectAPedia.com, All Rights Reserved. Author Daniel Friedman. How to Identify, Reset, or Adjust Hot Air Heating System (Warm Air Furnace) Controls and SwitchesThe articles listed below and found in this article series provide description of all of the major components of warm air heating systems, how to recognize or find each component, what it looks like, what goes wrong, and how to maintain, repair or adjust the component. If you don't know what kind of heat your building uses, we explain how to figure out the answer at HEATING SYSTEM TYPES. If your heating system is not working properly, see NO HEAT - BOILER or NO HEAT - FURNACE. Also see GAS PIPING, VALVES, CONTROLS for more details on how to inspect and test LP and natural gas piping, controls, valves, and tanks. We continue to add to and update this text as new details are provided. Contact us to suggest text changes and additions and, if you wish, to receive online listing and credit for that contribution. Comparing Forced Hot Air Heat with Gravity Hot Air Heating Systems
The sketch at above left, courtesy of Carson Dunlop, explains the basics of how a modern warm air heating system or "furnace" works and shows how warm air flows in a building. The Carson Dunlop sketch at right shows how an older gravity heating system worked, such as the "octopus" france shown at the top of this page. This article provides details about the operation, controls, inspection, diagnosis, and repair of all types of warm air heating furnaces. What is the Function of the Hot Air Furnace Fan Limit Switch?Details about the fan limit switch, how it works, and how it is set are provided at FAN LIMIT SWITCH. Excerpts are below.
A Quick Guide to Oil Burner and Gas Burner Flame SensorsFurnace Oil-burners use either a cad cell or stack relay to confirm that the furnace oil burner is operating properly and to avoid flooding the combustion chamber with un-burned oil. Where are the all the heating system reset buttons? If you are looking for the main reset button on heating equipment you'll want to see: AQUASTAT CONTROL Functions and CAD CELL RELAY SWITCH (hot water boilers and some water heaters), Stack Relay Switch on older oil fired boilers and furnaces, SPILL SWITCHES (gas fired equipment), and also Low Water Cutoff Controls on steam heating systems. At ELECTRIC MOTOR OVERLOAD RESET SWITCH we discuss the thermal overload switch and reset button that is found on many electric motors including those operating air conditioning fans, heating system oil burners, and furnace blowers and motors. A Guide to Oil Fired Furnace or Heating Boiler Cad Cell Relays
A Guide to Stack Relay Control Switches on Boilers, Furnaces, or Water Heaters
Guide to Draft Hoods on Gas Fired Furnaces, Boilers, Water Heaters - Purpose, Inspection, RepairWhat is a Gas Appliance, Furnace, Water Heater, or Boiler Draft HoodThe draft hood or draft regulating device we are discussing here is normally used only on gas-fired heating equipment, not on oil-fired equipment. Details about draft control for gas fired heating systems, including furnaces (like the furnace shown in our photo above) or boilers, are discussed at Furnace Draft Hood on gas fired equipment. (Details about draft control on oil fired heating systems, including furnaces or boilers, are discussed at Draft Regulators barometric dampers on oil fired equipment.) Guide to Furnace or Boiler Flue Gas Spill Switches on gas fired equipment - Purpose, Inspection, Repair
Guide to Inspecting Barometric Dampers or Draft Regulators on Oil Fired Furnaces, Boilers,
... Frequently Asked Questions (FAQs)... Ask a Question or Search InspectApediaQuestions & answers or comments about warm air heating system controls & switches 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.
For details about the setting, re-setting, or function of the controls and switches commonly found on hot air heating systems see these articles:
Books & Articles on Building & Environmental Inspection, Testing, Diagnosis, & Repair
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