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Thermostat Wire Colors Code | HVAC Control

What you will learn in this article:
1) What thermostat wire color is likely to go to which terminal on the thermostat
2) The function of each wire terminal on the average thermostat highlighting some of the differences in those functions from manufacturer to manufacturer

Sometimes the thermostat is not the problem. Please check this article for a checklist of things to check before calling a heating and cooling repair service.

Thermostat Wire Colors Code | HVAC Control

Thermostat Wire Colors CodeThermostat Wire Colors Code – Always follow the thermostat manufacturers instructions whenever changing the thermostat. Always turn the power off at the air handler and the condenser and make sure there is no voltage at the transformer before proceeding. The thermostat wire colors below are the most likely colors used for most installations however your thermostat wire colors may be different than what is indicated here. There is no official standard for thermostat wire colors. Thermostat wiring colors are not standardized but these are the most wiring methods used based on my years of experience in the HVAC field where I successfully wired a lot of thermostats.
Honeywell Thermostats Available Here

For instructions on how to wire a thermostat please see our how to wire a thermostat page.

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Air Conditioner Types | HVAC Cooling

Air Conditioner Types

Air Conditioner Types | HVAC Cooling This Trane Condenser is a part of a heat pump split system

This Trane Condenser is a part of a heat pump split system

Air Conditioner TypesAir Conditioners comprise a wide array of variety, types, and names when reference is made to them. Below is a list used to describe these types of air conditioner systems in generic terms. Any one of the air conditioner units below can heat, cool, or condition air or have a combination or single use depending on how they are specified at the factory and configuration. The end user, the customer, usually specifies to the contractor what application they need to satisfy and the contractor orders the equipment from a local distributor or factory representative. Equipment that is commonly used and purchased by contractors is usually kept in stock at the distributor. Some equipment that have unique specifications have to be special ordered from the factory and will require time for the manufacturing and shipping process.

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Trane Chilled Water Systems – Multi-Zone Air Conditioning Systems

Trane Chilled Water Systems – Multi-Zone Air Conditioning SystemsThis Trane HVAC chiller serves four different apartments. Chilled water systems offer a great way for multi-zone air conditioning. From small apartment buildings to large commercial buildings chilled water systems can serve multi-zone air conditioning systems. From one air conditioning zone to hundred the only limitation is the size of the chiller. If the air conditioning zoning system (the load) is matched up with the right sized chiller (in tons) the system will serve all air conditioning zones and keep all the occupants comfortably cool. Chilled water systems can also be integrated with the boiler system so that the same system can be used for heating and cooling. A good control system will add efficiency and more comfort to the system.

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Mini-split Air Conditioners or Ductless Air Conditioners Basics

Mini-split Air Conditioners or Ductless Air Conditioners

Ductless air conditioners are like regular air conditioners with ducts in that the compressor is located outside. They are often preferable to window units for aesthetic reasons. Ductless air conditioners are not good for cooling more than 1 or 2 rooms at a time and are expensive on initial purchase. Ductless air conditioners are also known a split system air conditioners or mini-split systems. As mentioned earlier the larger unit is places outside the building or home.

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SUNDAY, July 05, 2015


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HVAC Tips: Helping You Learn

A thermocouple is commonly used in standing pilot gas furnaces and water heaters is technically referred to as a copple element and produces millivolts when heat is applied to the tip. This millivoltage is necessary to keep the pilot valve inside the gas valve open. If the pilot flame goes out, the thermocouple stops generating millivolts. Without the millivolts, the valve closes thus preventing gas from escaping when there is no flame. Thermocouples fail because of oxidation. It is recommended that you keep the pilot lit throughout the year to prevent excess oxidation. The thermocouple can be found in many different types of gas furnaces, gas logs, and gas water heaters. Learn How to Test a Thermocouple with a Multi-Meter

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