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POST a QUESTION or READ FAQs about how to diagnose and repair air conditioning and heat pump systems.
What are the Parts of an Air Conditioning or Heat Pump System & How do Air Conditioners & Heat Pumps Work? If your air conditioner or heat pump system is not working, start at LOST COOLING CAPACITY for help in diagnosing and repairing the trouble. A detailed list and photos of air conditioner components can be seen at AIR CONDITIONER COMPONENT PARTS. A air conditioning or heat pump compressor which compresses low pressure refrigerant gas into a high pressure, high temperature gas.
The air conditioner or heat pump compressor unit is basically a high pressure pump driven by an electric motor. A condenser or condensing unit: typically a condensing coil inside which high temperature high pressure refrigerant gas flows, and over which a fan blows air to cool the refrigerant gas back to a liquid state (thus transferring heat from the refrigerant gas to the air being blown by the fan). An evaporator coil or cooling coil: typically the cooling coil is a section of finned tubing (it looks a lot like a car radiator) into which liquid refrigerant is metered and permitted to evaporate from liquid to gas state inside the coil. Evaporative cooling systems, or swamp coolers are discussed separately at EVAPORATIVE COOLING SYSTEMS.
An air handler and blower unit which provides a fan to blow building air across or through the evaporator coil. A duct system which distributes conditioned air from the air handler in to the occupied space (supply ducts), and which takes air from the occupied space and returns it to the cooling system air handler. Details of how heat pumps work, are inspected, diagnosed, and repaired begin at HEAT PUMPS. Air conditioner controls and features, which include a room thermostat, electrical switches, fuses or circuit breakers, condensate handling system, and air filters. After completing the programs below, new technicians generally need between 6 months to 2 years of field experience before they are considered proficient. HVAC Excellence is a not for profit organization that has been serving the HVACR industry since 1994. NCCER is a not-for-profit education foundation created to develop industry-driven standardized craft training programs with portable credentials and help address the critical workforce shortage facing the construction industry.
In addition, all technicians who purchase or work with refrigerants must be certified in their proper handling. NOTE: when considering an HVAC training course or school, check the HVAC education accrediting associations listed above.
NATE is supported by ASHRAE, the US EPA, and a host of other trade and professional associations. Features covered in depth include: descriptions of typical styles, characteristics and requirements, testing, listing, reporting, certifying, packaging and product marking.
Guidelines for proper installation are treated and illustrated in depth, featuring connections, splices and proper support methods for flexible duct. NOTE: because Wikipedia entries are fluid and can be amended in real time, we cite the retrieval date of Wikipedia citations and we do not assert that the information found there is necessarily authoritative. Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the InspectAPedia Bookstore. Complete List of Air Conditioning & Heat Pump Design, Inspection, Repair Books at the InspectAPedia Bookstore. The Illustrated Home illustrates construction details and building components, a reference for owners & inspectors. We provide Honeywell, White Rodgers & other thermostat wiring diagrams and explanation showing how to wire a room thermostat, including just what connections to make and how wires and connectors are color coded to make things easy. Our page top sketch, courtesy of Honeywell Controls, illustrates the wiring diagram for a traditional Honeywell T87F thermostat used for 2-wire single pole single throw control of heating only in a typical gas-fired heating system. Locate the room thermostat at about chest height on an interior wall, in a location where the thermostat won't be affected by drafts or other unusual temperature conditions. As Carson Dunlop Associates' sketch (left) explains, there are a number of places where you should not locate the room thermostat. Do not place heat-emitting devices such as lamps or small appliances close to the thermostat.
Seal the hole in the building wall through which the thermostat wires pass out to the thermostat mount. It's important to mount mercury-bulb thermostats as level as possible since otherwise you're putting the thermostat out of accurate temperature calibration. That's because the coiled bimetallic spring has to move that mercury bulb to a tipped position to turn the heating or air conditioning system on or off in response to room temperature. When we found a thermostat that did not heat a room accurately to the called-for temperature, we'd take a look to see if it was installed out of level before looking further. Newer thermostats that rely on other sensor and switch designs do not have this sensitivity to being out of level and some (such as the 3M-22 thermostat) note in their installation instructions that the thermostat does not have to be level.
A quick scan of heating and cooling thermostats in the catalogs of HVAC suppliers such as Grainger can quickly become overwhelming as there are literally hundreds of thermostat models and quite a few different types and applications. Cooling, heating or both: does the wall thermostat control only air conditioning, a heat pump, or a heating system, or both? Type of Thermostat by Temperature sensor: many older wall thermostats used a combination of bimetallic spring and a mercury bulb to activate the thermostat in response to room temperature. Our photos above show a traditional round Honeywell® room thermostat and at above center my dental pick pointer indicates the mercury bulb switch in this device.
Number of Control Wires Used in the Thermostat: keep in mind that the number of wires in the wall may be greater than the number of wires actually in use. In some jurisdictions there may be environmental protection restrictions on the proper disposal of mercury-containing thermostats.
If you do not know the brand of your thermostat, take a look at THERMOSTAT WIRING GENERIC Control Points.
Hooking up a 2-Wire Thermostat: How Do I Install & Wire Up a Room Thermostat like the Honeywell Round Wall T87F Series Thermostat? Two wire thermostat wiring instructions: In a two-wire installation, the thermostat backing plate is mounted level on an interior wall in the room which we want to be the master temperature control for the area served by the heating or cooling system. Our photo (above left) shows the backing plate that is mounted first when installing a round Honeywell Series 20 type room thermostat. At left the thermostat wiring diagram illustrates use of a Honeywell T87F thermostat in a 2-wire application controlling a gas fired heating appliance.
In the Honeywell T87F thermostat series the single pole double throw switch makes (closes) one set of contacts when the temperature falls - to turn on the heating appliance. In thermostats that also control a cooling system, a second set of contacts will make or close on temperature rise.

For completeness in understanding where the red and white thermostat wires originate and end up, at below left we illustrate the red and white thermostat wires originating at the low voltage transformer, and at below right we illustrate a typical thermostat wiring connection in an R8182 Aquastat primary controller of a heating boiler, using the T and T terminals.
3-Wire Thermostats: Where Do We Connect the Red, White, & Blue (if present) Wires to a Typical Three-Wire Wall Thermostat?
On other, in fact most contemporary room or wall thermostats it may be necessary to plug in a connector between the thermostat and its mounting plate. 6-Wire Thermostats: Where Do We Connect the Red, White, & Blue, Yellow, Green, Orange Wires in a Typical Six-Wire Wall Thermostat?
At left you can see the 11 possible thermostat wire connectors on the 3M-22 FIltrete thermostat.
Again, you will have to check to see how the installer has ran the wires from the thermostat. If your thermostat is controlling only a heating system or only an air conditioning system, you will only have a red wire, and a white wire coming form the inside unit, to the outside unit. On an air conditioner these two wires will go on the contactor to send 24 volts to the coil to pull the contactor in to start the air conditioner. On a heating system these two wires will go to two thermostat connections on the primary controller such as an aquastat or air handler control that turns on the heating unit.
Hot water heat In Canada the TT wires will activate an aquastat control that will turn on and off the boiler based on its temperature; circulators are already running.
These are the traditional wiring schematics, again, check the thermostat to see if this is the case with yours.
We moved this topic to LINE VOLTAGE 120V Wall Thermostat Wiring - separate article in order to keep our text on line voltage thermostats together. The following thermostat wiring suggestions were derived from a thermostat wiring connection code list provided courtesy of J. THERMOSTAT WIRING LENNOX: Lennox thermostat and equipment wiring color codes may vary significantly from common usage. We provide thermostat wiring connections for just about every type of residential heating or cooling room thermostat as well as a description of thermostat wiring color codes & conventions. Continue reading at THERMOSTAT WIRE FUNCTIONS or select a topic from the More Reading links or topic ARTICLE INDEX shown below. Or see THERMOSTAT INSTALLATION STEPS for a step by step photo guide to installing a room thermostat.
Hello - I am replacing a round Honeywell thermostat with a non-programmable digital Honeywell unit. Patrick, typically the three wire thermostat hookups would be exactly the same for the old and new thermostats. For details of wiring a typical and simple digital Honeywell thermostat, see Honeywell 5-2 Day Programmable Thermostat - RTH2300B1012. Kurt, as you see in the examples at For help in understanding the wiring of your old thermostat, see Three-Wire Honeywell Wall T87-F type Thermostat wiring and also see Generic HVAC Thermostat Control Wiring Points. After searching hi and low, your site was the only one that provided correct information on rewiring an old thermostat to a digital thermostat. I would like to install a thermostat that would allow me to program not only the temperature variations, but the fan.
Remember to check for a broken or open TT wire enroute between the thermostat and the control at the wires' other end.
This unique A-Z guide to central heating wiring systems provides a comprehensive reference manual for hundreds of items of heating and control equipment, making it an indispensable handbook for electricians and installers across the country.
In addition to providing concise details of nearly 500 different boilers fuelled by electric, gas, oil and solid fuel, and over 400 programmers and time switches, this invaluable resource also features numerous easy-to-understand wiring diagrams with notes on all definitive systems. The ABC's of Retention Head Oil Burners, National Association of Oil Heat Service Managers, TM 115, National Old Timers' Association of the Energy Industry, PO Box 168, Mineola, NY 11501. Find more about 2004 Acura TL Body Electrical System, Harness Wiring Diagram service and troubleshooting here on page 1482 – 1816 of Acura TL service manual.
Via email, text message, or notification as you wait on our site.Ask follow up questions if you need to. Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions. I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Topics range from light bulb replacement to automotive computer replacement and programming. Detailed information about air conditioning purchase, installation, troubleshooting & repair is provided here - CONTACT us if you can't find something.
Usually the compressor is in the outdoor portion of an air conditioning or heat pump system.
The condenser unit is basically a coil of finned tubing and a fan to blow air across the coil. The change of state of the refrigerant, from hot high pressure gas to a liquid releases heat, including heat collected inside the building) to the outdoors.
This state change of the refrigerant, from liquid to gas, absorbs heat, cooling the evaporator coil surface and thus cooling indoor air blown across the cooling coil. The air handler blower fan unit moves building air across the evaporator coil surface in order to condition building air by cooling it (and thus also by removing moisture from the cooled air). So in air conditioning mode the heat pump is moving heat from inside the building to outdoors while in heating mode the heat pump is moving heat from outdoor air (or water in some designs) to the building interior. We explain how to inspect & repair central air conditioning systems and for homeowners we also answer basic HVAC questions such as what are the basic air conditioning components?
Department of Labor website describes HVAC jobs and the employment outlook for HVAC technicians. It is our goal to improve competency through validation of the technical education process.
This programmatic accreditation program is the only one that is supported by the major industry associations. The text is intended as a reference guide to help building owners operate and maintain their home effectively.
Wall mounting, leveling, and wiring requirements vary depending on the type of room thermostat and what it needs to control. Drafts through wall cavities can blow out of this hole and affect proper thermostat operation. Here we describe further details that can help you choose a replacement thermostat that will accomodate the wires used to control you rair conditioning, heat pump, or heating system. No modern room thermostat uses mercury bulbs - rather they use a thermistor or other device to respond to temperature changes.

Check the colour and number of wires actually connected to your thermostat and make careful note of the terminal name, ID or number to which each wire was connected.
Typically the red wire is originating at the heating or air conditioning low voltage transformer and brings power to the thermostat.. Typically the white wire is taking power from the thermostat to the operating control circuit board in the heater or air conditioner. The electrician may have run a multi-wire set of low voltage wires through the walls of the building between the low voltage transformer and the thermostat (etc), but in this simple installation the other wires at the thermostat are not being used.
This second set of contacts may also be used to operate other controls or valves in some heating systems.
The screws that secure a round Honeywell traditional wall thermostat to its backing plate will also connect it properly to the wiring. Also see Table of Common Heating and Cooling Thermostat Wiring Connections for added details. Be sure to consult with Lennox and obtain the proper installation manual for your equipment. This article series answers most questions about central heating system troubleshooting, inspection, diagnosis, and repairs.
Many thermostat wiring setups are straightforward or "cookbook" but why not find the brand name on your thermostat and then you can obtain the installation instructions right from the manufacturer?
My old thermostat had no wire lettering and that was making it frustrating trying to install my programmable thermostat.
The book provides comprehensive coverage of wiring and technical specifications, and now includes increased coverage of combination boilers, recently developed control features and SEDBUK (Seasonal Efficiency of Domestic Boilers in the UK) boilers ratings, where known. Brief component descriptions are provided, along with updated contact and website details for most major manufacturers.
This unique offering lets you monitor and control your HVAC systems by simply pointing your Browser to our secure Proliphix Web Site. Fundamentals of Gas Appliance Venting and Ventilation, 1985, American Gas Association Laboratories, Engineering Services Department.
It discuss about the body electrical system, connectors, wiring diagram, electrical schematics, wiring harness, relays, fuse of the vehicle. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. My husband seems to think that it is in the wiring as it worked breifly and now hasnt for months.
Usually the condenser unit is in the outdoor portion of an air conditioning system, often packaged along with the compressor motor discussed above.
Because the ability of a heat pump to extract heat from outdoor air diminishes at low outdoor temperatures, heat pump systems in northern climates also include a backup or auxiliary heating system. By setting standards and verifying that they have been met, we inspire the industry to excel. How to select the proper type of replacement thermostat for air condtiioning or heating systems.
Don't forget to turn off all electrical power involved with your heating system before working on thermostat wiring, and confirm that power is off where you are working by using an appropriate test instrument such as a VOM. As we have warned before, don't forget to turn off all electrical power involved with your heating system before working on thermostat wiring, and confirm that power is off where you are working by using an appropriate test instrument such as a VOM.
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.
Your site had my showed my old thermostat wiring and gave me the information I needed so quickly! Can I just wire them together after turning off power and then turn the power back on and see if the furnace starts to run? I don't even see mention of such a thermofuse on the corresponding Bentley wiring diagram for this year. The vehicle electrical system includes the battery, wiring, starting motor and controls, generator and voltage regulator, electronic ignition, and electronic fuel metering. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. We know that all of the challenges that face our industry are achievable by continuous improvement in the way that we prepare technicians. Special Offer: For a 10% discount on any number of copies of the Home Reference Book purchased as a single order. Failure to respect this advice risks equipment damage, and in some cases electrical shock or even a building fire. On the old round unit the red wire went to the R terminal, the white wire went to the w terminal and a green wire went to B terminal. Also included may be a computerized electronic engine control system, an electronically displayed driver information system, various types of radios and sound systems, and many other electrically operated and electronically controlled systems and devices.
To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles.
Thanks to Alan Carson and Bob Dunlop, for permission for InspectAPedia to use text excerpts from The Home Reference Book & illustrations from The Illustrated Home. 2) Volume III, Radiant Heating, Water Heaters, Ventilation, Air Conditioning, Heat Pumps, Air Cleaners, James E.
Is there a chance that it shouldn't be there at all, or is it absolutely missing and must be replaced?
JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals. Carson Dunlop Associates' provides extensive home inspection education and report writing material.
If I selected "fan on" instead of "fan auto" the zone would heat up but would not shut off (hot water kept flowing even if I selected a temp below room temp).
Special Offer: For a 5% discount on any number of copies of the Home Reference eBook purchased as a single order.

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