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Category Archives: Gas Furnaces

Gas Manifolds | Furnace Components


Gas Manifolds

Gas Furnace Components 2

90 Plus Furnace

Gas Manifolds – The furnace manifold connects the valve with the main burners and it is important that the proper pressure be present inside the manifold for proper combustion. Manifold pressure is different from natural gas to liquid propane and this pressure needs to be set with a special instrument which the HVAC installer or HVAC start-up technician should have. The manifold pressure should be set according to the furnace manufacturer’s instructions and is done by an adjustment on the regulator and valve as noted in the valve section (see gas furnace components). The setting will depend on the type of fuel, natural gas or LP, and the manufacturers instructions.


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Gas Furnace Troubleshooting and Repair – Flash Codes


Gas Furnace Troubleshooting and Repair – Flash Codes

In the extreme cold weather there is nothing worse than losing your heating system. Here are some basic tips to checking basic things for the average person to hopefully make a quick fix so you do not have to suffer until an HVAC repairman comes.


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How to Test a Thermocouple with a Multi-Meter


How to Test a Thermocouple with a Multi-Meter

What you will learn from this article:
1) How not to guess if the thermocouple is bad
2) Step by step procedure for testing a thermocouple with a multimeter
3) What reading you should get if the thermocouple is good
4) Lots of resource and related links to help you learn more

How to Test a Thermocouple with a Multi-Meter? So you have found the pilot light will not stay lit when you try to light the pilot light. You know you have gas and everything seems to be fine so what is the problem?

You ask a friend and the friend tells you the thermocouple is bad.

How to Test a Thermocouple with a Multi-Meter

Pilot Burner that Feeds the Flame to the Thermocouple (not pictured)

So how do you test the thermocouple to see if it is bad or not? You will need a multi-meter that will read millivolts (most meters read small voltage like millivolts which is 1/1000th of a volt) and a source of fire such as a lighter or small torch. How to Test a Thermocouple with a Multi-Meter step by step:
Fluke 87-V Digital Multimeter

Honeywell CQ100A1013 24-Inch Replacement Thermocouple for Gas Furnaces, Boilers and Water Heaters


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Trane Gas Furnace Efficiency Factors & Fuel Purity


Trane Gas Furnace Efficiency FactorsTrane Gas Furnace Efficiency Factors – This is a Trane gas furnace. It is also called a Trane 90 plus gas furnace because it offers efficiency levels up to 90 percent plus AFUE. Gas or oil furnaces generally cannot achieve efficiency at 100% because of impurities in the fuel including moisture. This is the reason why no fossil fuel furnace sold has a rating of up to 100%. This biggest impurity in many fuels is moisture which is difficult to remove because it is in the distribution and storage places where the fuel is distributed and stored. If these impurities were removed from the fuels before they were introduced to the furnace the cost of the fuel would be much higher and the cost to benefit ratio would not be effective.


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How to Test a Thermocouple for a Water Heater


How to Test a Thermocouple for a Water Heater

How to Test a Thermocouple – Everyone who has owned a gas heater including furnaces or water heaters will know that from to time you have to light the pilot light unless you have electronic ignition that automatically lights the pilot light.
Fluke 87-V Digital Multimeter

Honeywell CQ100A1013 24-Inch Replacement Thermocouple for Gas Furnaces, Boilers and Water Heaters

How to Test a Thermocouple - Heating System Thermocouples

Thermocouple

Sometimes when you try to light the pilot it does not want to stay lit and you know you have a problem. Often times the problem turns out to be a bad thermocouple that needs to be replaced. But how do you know if the thermocouple is bad and the problem isn’t something else?


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THURSDAY, July 02, 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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