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InspectAPedia ® Home HEATING SYSTEMS AFUE DEFINITION, RATINGS AGE of AIR CONDITIONERS & HEAT PUMPS AGE of HEATERS, BOILERS, FURNACES AIR CONDITIONING & HEAT PUMP SYSTEMS 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 ANIMAL ALLERGENS / PET DANDER ANIMAL ENTRY POINTS in buildings ANIMAL ODORS IN buildings APPLIANCE EFFICIENCY RATINGS ASBESTOS IDENTIFICATION IN buildings BACKDRAFTING HEATING EQUIPMENT BACKFLOW PREVENTERS, HEAT BACKDRAFTING HEATING EQUIPMENT BACKUP HEAT for HEAT PUMPS BAROMETRIC DAMPERS BASEBOARD HEAT BIOGAS PRODUCTION & USE BLEVE EXPLOSIONS BLOWER DOORS & AIR INFILTRATION BLOWER FAN CONTINUOUS OPERATION BLOWER FAN OPERATION & TESTING BLUE vs YELLOW COMBUSTION FLAMES BLUERAY Recall BOILERS, HEATING BOILER PRESSURE & TEMPERATURE SETTINGS 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 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 DRAFT MEASUREMENT, CHIMNEYS & FLUES DRAFT REGULATORS, DAMPERS, BOOSTERS DUCT INSULATION, Asbestos Paper DUCT SYSTEM & DUCT DEFECTS DUCTS, Asbestos Transite Pipe 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 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 INSPECTION DETAILS HEATING SYSTEM NOISES HEATING SYSTEM TYPES HOT WATER HEATERS HOT WATER IMPROVEMENT INSULATION INSPECTION & IMPROVEMENT LOW VOLTAGE BUILDING WIRING LOW VOLTAGE TRANSFORMER TEST LP & Natural Gas Safety Hazards MANUALS & PARTS GUIDES - HVAC MIXING / ANTI-SCALD VALVES NO HEAT - BOILER NO HEAT - FURNACE NOISE / SOUND DIAGNOSIS & CURE NOISE AIR CONDITIONER / HEAT PUMP NOISE, DUCT VIBRATION DAMPENERS NOISE, HEATING SYSTEMS NOISE, PLUMBING NOISE, WATER HEATER ODORS GASES 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 PASCAL CALCULATIONS PRESSURE REDUCING VALVES PRESSURE REGULATOR, WATER PUFFBACKS, OIL BURNER PUMPS, PONY PUMPS RADIANT BARRIERS RADIANT HEAT RADIANT HEAT Floor Mistakes to Avoid RADIANT HEAT TEMPERATURES RADIANT SLAB FLOORING CHOICES RADIANT SLAB TUBING & FLUID CHOICES RADIATORS REFRIGERANTS & PIPING 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 HAZARDS & INSPECTIONS SAFETY HAZARDS GUIDE SAFETY, HEATING INSPECTION SAFETY RECALLS, Chimneys, Vents, Heaters SAFETY, HEATING INSPECTION SAFETY,HOME HEATING TIPS 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 IMAGING MOLD SCANS THERMAL MASS in BUILDINGS THERMAL TRACKING & HEAT LOSS THERMOSTATS, HEATING / COOLING 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 |
Hot water heating circulators or circulator pumps: install, troubleshoot, repair advice: this article series discusses Circulator Pumps: how to find, inspect, diagnose, and repair problems with Hot Water Heating System Circulator Pumps or circulator pump relay switches and controls. Also you will see that This website answers most questions about Heating System Boiler Controls on central heating systems to aid in troubleshooting, inspection, diagnosis, and repairs. Green links show where you are. © Copyright 2013 InspectAPedia.com, All Rights Reserved. Author Daniel Friedman. Which is better: heating control using zone valves or heating control using individual circulators?Also see additional circulator diagnostic checks at Checks for Circulator Operation. Contact us to suggest text changes and additions and, if you wish, to receive online listing and credit for that contribution. Either approach to individual heating zone control can work just fine - using zone valves or using individual circulators. Some heating contractors prefer using individual circulator pumps, one per zone, perhaps because they recall the history of unreliable zone valves which tended to clog or jam in some models by some manufacturers. The "zone valve" fellows retort that modern heating zone valves are as reliable or more reliable than [some models of] heating circulator pumps and that a zone valve costs a lot less. Adding zone control to an existing heating system may be less costly by adding a zone valve than by adding a circulator pump. What goes wrong with hot water heating circulator pumps and circulator switches?
The heating system circulator pump, such as the trio of pumps shown at the top of this page, is used to move hot water from the heating boiler out through one or more loops of piping in a building, through heating devices such as radiators, heating baseboards, or convector units, then through return piping back to the heating boiler. When the water temperature drops to a pre-set level the heating boiler will re-heat the water. The circulator relay is an electrical switch which, in response to a request for heat from a thermostat, turns on the circulator pump. Some heating systems use a single circulator to move hot water through the building's heating devices. In a one-circulator system, the building may still divide its heat into various zones or sub-areas of individual heat control, by using either individual radiators in rooms or perhaps by using electrically controlled zone valves which open and close flow of hot water through sub-loops in the building heating piping. Some heating systems use multiple circulators to provide heat to individual building areas or "zones". In this case each heating zone will have its own thermostat which, acting as a low-voltage "heat on-off switch" will turn on individual circulator pumps when heat is desired in that zone. Less common are mixed heating zone systems in which multiple circulators are used but one or more of the circulators feeds a heating water pipe which is subsequently divided into additional sub-zones of heat control, each sub-zone being controlled by a zone valve. Before assuming the heating system is not working when the thermostat is calling for heat, feel the radiators or baseboards to see if they are getting hot. On a call for heat at the thermostat, if the heating boiler is already hot (above the lower limit or cut-in temperature) then the circulator should turn on and move hot water to the baseboards or radiators. Only after the boiler temperature drops below the cut-in temperature will the heating boiler turn on to re-heat the water. The connection between the thermostat and the heating boiler turning on or off is indirect. On most heating systems the thermostat turns the circulator pump on or off and the temperature of the heating water turns the heating boiler on or off.
If the boiler runs but the heating baseboard or radiators in an area do not get hot, the problem could be
If the heating boiler itself if does not turn on in a response to a call for heat see NO HEAT - BOILER. Frequently Asked Questions (FAQs) about hot water heating circulator pumps & relays: installation, troubleshooting, repairQuestion: circulator pump runs in short burstsMy furnace's circulator pump has been running in short bursts only lately, as opposed to full length cycles. It's a gas-fired hydronic system, a high efficient one w/ a Peerless Pinacle furnace. never experienced this before.Do you have any ideas? - mark4man 12/5/2012 Reply:First I'd check for a bad circulator control relay or possibly a thermostat wire that is intermittently shorting together. Occasionally a bad thermostat can also cause intermittent on-off calls for heat that can lead to odd circulator behavior. A second set of possibilities might be a circulator pump that is binding or failing. See CIRCULATOR PUMP RELAYS & OTHER CONTROLS and see THERMOSTATS, HEATING / COOLING for details. ... Ask a Question or Search InspectApediaQuestions & answers or comments about installing, inspecting, & troubleshooting hot water heating system circulators. 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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