Re: where is the pilot in a gas furnace. The heater stop...
Most of them are at the bottom of the heater, two wing nuts hold on the sight glass to the heat exchanger.. losen one of the wing nuts and swing out the first layer of metal.. then you can see the pilot.... read your owners manual on proper ighting procedure.. should be on the unit aswell somewhere
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www.manualslib.com > Brands > Williams Manuals > Furnace > 2509622
2509622; 2539622; 2559622; 3509622; 3539622; 3559622; ... WHAT TO DO IF YOU SMELL GAS: ... Williams furnace co. direct-vent wall furnace owner's manual (24 pages) ... Caring for Your Furnace ............24-25 Locating Wall Furnace and Thermostat ........6-7 Learn how to keep your new Williams Furnace operating.
Is the thermocouple burnt out.? A bad one of these will not allow the pilot to function . The thermocouple is the outfit that the pilot heats up when it tries to start up. A lot of the time this is the problem when the furnaces won't light up.
If this is a standing pilot system, turn the gas valve to pilot position. push in the knob & hold while lighting pilot...keeping holding knob down for a minute... this will pick & hold the gas valve. Let go of the knob & see if the pilot stays lit, if it does, then turn the knob to on position & the furnace should start if there is a call for heat from the thermostat
on the bottom of the unit there is an access door remove it and behind it you will find a gas valve and a pilot find the piolot......turn off the gas valve and move the selector to piolot depress the switch and at the same time place the flame from a log lighter onto the pilot light after this lights turn the gas valve to run and the burner should light.
WHEN A PILOT STOPS WORKING, A BIG PERCENTAGE OF THE TIME IT IS THE THERMOCOUPLE, WHICH TELLS THE FURNACE TO ONLY RELEASE GAS INTO THE BURNER WHEN THE PILOT LIGHT IS LIT.
I'D START WITH REPLACING THIS THERMOCOUPLE FIRST. IT IS NOT A VERY EXPENSIVE PART. ITS A SILVER COLORED CORD LEADING TO A SENSOR ABOUT THE SIZE OF A SHORT PENCIL ON THE END. THE OTHER END HAS A BRASS FITTING TO SCREW INTO THE CONTROL UNIT. THE SENSOR IS NEXT TO THE PILOT LIGHT IN THE PILOT LIGHT AREA.
The electronic ignition system in a gas furnace is a modern development that
allows more reliable performance than standing pilot furnaces, provides energy savings and contributes to better furnace efficiency (AFUE). With a standing pilot, found most commonly on older low
efficiency furnaces (55% to 65% AFUE is not uncommon), a small gas flame is
always burning and is known in the lexicon of American home repair as a "pilot
light". The problem with this type of "analog" ignition is that it wastes energy
by constantly burning gas and can sometimes be unreliable.
These issues have led to the development of electronic ignition
systems for mid to high efficiency furnaces that exceed the U.S. government's
established minimum AFUE rating of 78%. The electronic ignition occurs typically
in one of two ways:
Intermittent Pilot, or
Hot Surface Ignition
The intermittent pilot system uses an electronically controlled high
voltage electrical spark to ignite the gas pilot and then subsequently the main
burners, when the thermostat
calls for heat.
The hot surface ignition system uses an electronically controlled
resistance heating element not unlike a light bulb filament (and shown in the
photo above), to ignite the gas burner.
It is important to understand some of the other components of a modern
furnace that you will encounter depending on the type of high efficiency furnace
you have. Why? Because they can also come into play in repairing an electronic
ignition furnace when it won't run properly. Let's take a quick review of the
types of furnace designs and components found in high efficiency furnaces using