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furnacesequenceofoperation-blog · 7 years ago

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The Modern Furnace Sequence of Operation

Furnace Sequence of OperationPrior to we begin, we ought to say only qualified persons must try functioning on a gas furnace. Please seek advice from an expert service organization for repairs or for right diagnosing!

Bear in mind when furnaces were pretty basic? There was a pilot in addition to a thermocouple, a couple of security controls, a blower assembly, a set of burners and not surprisingly the heat exchanger. The down side of these old furnaces was the cost to operate them as they were normally about 50% efficient. The contemporary furnaces of now run between 80% and 95% effective.

We will speak about the standard 80% single stage heating gas furnace in this short article as this can be one of the most popular available today.

On a signal from the area thermostat that heating is required, the very first thing that takes location would be the draft inducer begins operating and producing a draft in the heat exchanger. If there's no obstruction in the flue pipe in the furnace, the inducer will send a little stress for the stress switch via a modest rubber tube, clearly, this tubing have to be free of charge of debris or any cracks. If there is sufficient draft, this will likely close contacts inside the stress switch. The stress switch then sends a signal down for the control board that is ordinarily mounted inside the blower section. There are many safety controls such as, but not restricted to, over temperature limit switches, plenum thermostats, flame sensors, and roll out switches that has to be closed, but if they're along with the handle board is superior, a signal will likely be sent to the ignition device. There are plenty of ignition systems used including intermittent spark ignition, direct spark ignition, hot surface ignition, electronic ignition, standing pilots and other individuals. MOST furnaces at this time use hot surface ignition using a flame sensor. So we'll concentrate this article around the hot surface ignition system that makes use of a flame sensor.

You'll find many distinct kinds of hot surface ignitors available. By far the most popular will be the Silicone Carbide type that is Really brittle and breaks effortlessly. Do not deal with this form by the carbide section because the oil from your hands will shorten the life span. This variety has a life expectancy of 3-5 years generally. You will find flat ones and round spiral versions of these.

The following type could be the Silicone Nitride that will final considerably longer and usually do not break quickly, a few of them are meant for 24 volt systems as within the Honeywell Wise Valve systems, and Trane 80 volt systems.

You can find also older systems that use a hot surface ignitor that doesn't use a separate flame sensor but rather once they glow orange then switch more than to sense the flame. These systems are called radiant systems and have already been established unreliable and occasionally unsafe as they may be not sensing a flame on all burners, only the a single the ignitor is mounted on. Most furnace suppliers are requiring you to add a flame sensor once you modify a handle board.

Assuming the handle board "sees" all of the security controls are closed and it features a signal in the pressure switch, it'll then send 120 volts to the hot surface ignitor which is typically mounted around the suitable side of your burners. (Be conscious that some ignition systems use 24 volts for lighting a pilot and Trane and a few other people use a 80 volt Silicone Nitride method on A number of their models). Once the hot surface ignitor glows orange you should hear a click that is the gas valve opening to let gas flow towards the burners. This must give just about instant ignition on all burners. The flame sensor is really a compact white ceramic electrode mounted around the left side with the burners. It's job is usually to "sense" a flame around the burner that is in the opposite side in the furnace from the hot surface ignitor. If it doesn't get a flame inside about 10-15 seconds, it's going to shut the burners back off for safety. Usually if a furnace goes by way of (three) cycles like this, it is going to go into lock out. To obtain it out of lock out you'll need to shut the power for the furnace off and back on. Flame sensors ought to be cleaned with sandpaper once a year as part of maintenance.

As soon as all the burners are lit and running, the control board will send a signal for the blower motor to begin.

Be advised nonetheless, there are several manage boards like integrated manage boards where all functions in the furnace are controlled by this board, also around are ignition modules utilised for ignition only and a separate fan timer handle board that only starts and stops the blower motor as well as monitoring safety controls.

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the-tenders · 8 years ago

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