Ameer Randolph
If you need to turn off the fuel supply to your furnace, it's important to proceed with caution. The first step is to turn off the electrical power to the heating equipment. This can be done at the emergency off switch, which is usually located outside the boiler or furnace room, often near a doorway. After turning off the power, you can proceed to turn off the fuel supply. For gas-fired heating equipment, there is typically a shut-off valve outside the equipment cabinet. This valve is usually a lever, and when it is at a right angle to the piping, the valve is off, and the gas flow will stop. If the valve has a round handle, turning it fully clockwise will shut off the gas supply. It's important to ensure that the gas supply has been shut off by checking the dials on the meter. If you're dealing with a fuel oil or propane tank, additional steps may be required, such as addressing potential issues with the oil supply line safety valve.
Characteristics and Values Table for Turning Off Fuel on a Fuel Tank for a Furnace
| Characteristics | Values |
|---|---|
| Turn off electrical power | Turn off electrical power to heating or cooling equipment at the Emergency OFF switch, usually located outside the boiler or furnace room |
| Turn off oil or gas supply | Turn off oil or gas supply to equipment; for gas furnaces, adjust the thermostat from "heat" to "off" or "cool" |
| Shutoff valves | For gas furnaces, shutoff valves are usually levers or round handles; turn levers at a right angle to the pipe to stop gas flow, and turn round handles clockwise to the off position |
| Pilot light | Pilot lights should be kept lit in the offseason unless you know how to relight them; turning off the pilot light can save gas and money |
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What You'll Learn
Turn off electrical power
Turning off the electrical power to your fuel tank for a furnace is an important task that should not be overlooked. Here is a step-by-step guide to help you through the process:
Locate the Emergency OFF electrical switch: Typically, this switch is located outside of the boiler or furnace room, often on a wall near a doorway. In residential homes, it is usually placed at the top of a basement stairwell. There may also be a second electrical switch located directly at the heating equipment. The switch plate is usually coloured red for easy identification.
Turn off the electrical power: Once you have located the Emergency OFF electrical switch, proceed to turn off the electrical power supply to the heating or cooling equipment. This action will cut off the power to the fuel tank for the furnace.
Handle the thermostat wires carefully: If you need to replace the thermostat or perform any maintenance involving the wires, it is recommended to turn off the power. Connecting the wrong wires can potentially damage the control circuitry. Use electrical tape to insulate each wire after disconnecting it. Be cautious when working with the wires, as accidentally touching bare wires can be hazardous.
Shut off the pilot light (if applicable): If your furnace has a pilot light, you may want to shut it off as a precaution before turning off the electrical power. The pilot light is a small gas flame that serves as the ignition source for the furnace. Turning it off during the warmer months can help save gas and money. Locate the valve on the gas line connected to the furnace and turn it to the “off” position, which is perpendicular to the gas line. Remember to turn the gas valve back to “on” when you reactivate the furnace.
By following these steps, you can safely turn off the electrical power to your fuel tank for a furnace. This process is essential for performing maintenance, improving energy efficiency during warmer months, or handling emergency situations involving heating or cooling equipment.
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Turn off oil or gas supply
If you need to turn off the oil or gas supply to your furnace, the first step is to turn off the electrical power. This can be done at the Emergency OFF electrical switch, which is usually located outside of the boiler or furnace room, often on a wall near a doorway. In many homes, this switch is located at the top of a basement stairwell, and there may also be a second electrical switch located at the heating equipment.
Next, you will need to turn off the oil or gas fuel supply. For gas-fired heating equipment, there should be a shutoff valve outside of the equipment cabinet. This is usually a lever, and if the lever is at a right angle to the piping, the valve is off and the gas flow will be stopped. If the gas valve has a round handle, turning the valve fully clockwise will turn it off. Some gas meter valves have a hole in the handle, which lines up with a hole in the valve body when the gas is shut off.
If you are turning off the gas supply, it is important to note that you should not turn off the pilot light unless you know how to relight it. Turning off the pilot light can save on gas and money during the warmer months, but if you are unsure how to relight it, you may have difficulty getting your furnace going again in the fall.
If you are working with a fuel oil or propane tank, it is important to be cautious, as the tank may have floated and broken the connecting pipes if you have experienced flooding. There is often confusion about which way to turn the valve to shut off the oil supply, and it is important to consult a professional if you are unsure.
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Check for gas leaks
To turn off the fuel supply to a furnace in an emergency, first turn off the electrical power to the heating equipment. This can be done at the emergency off switch, which is usually a red switch plate located outside the boiler or furnace room, often near a doorway or at the top of a basement stairwell. There may also be a second electrical switch at the heating equipment itself.
Next, turn off the gas supply. For gas-fired heating equipment, codes require a shutoff valve outside of the equipment cabinet. If the valve has a lever, then the valve is off when the lever is at a right angle to the piping. If the valve has a round handle, turn it fully clockwise to turn it off. If the gas meter valve has a hole in the handle, this will line up with a hole in the valve body when the gas is shut off. When the holes are lined up, you know the gas supply has been shut off. If you are unsure, write down the numbers on the dials and check again after five minutes. If the numbers have changed, the valve is not closed.
Now that the gas supply is off, you can check for gas leaks. Gas leaks can be dangerous, causing health issues and even death, so it is important to act quickly. Gas leaks can be identified by:
- A rotten egg smell: Natural gas is odorless, so gas companies add a chemical called mercaptan, which smells like sulfur or rotten eggs. If you detect this smell, your furnace could be leaking. The smell will become stronger as you approach the source of the leak.
- A hissing sound: A hissing noise coming from the furnace, in addition to the rotten egg smell, indicates a severe leak.
- Orange or yellow pilot light: The pilot light on a furnace should always burn blue. If the flames are orange or yellow, it could indicate that the unit is producing deadly carbon monoxide gas.
- Carbon monoxide detector: It is recommended to have a carbon monoxide detector within 20 feet of your furnace and all other gas-burning appliances.
If you suspect a gas leak, shut off the gas valve and immediately call your local HVAC or gas company. Open all doors and windows to help the gas dissipate, and leave the house with any other occupants and pets. Do not return to your home until the leak has been professionally inspected and repaired.
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Replace the thermostat
Replacing a thermostat can be a DIY project, but it is important to be careful and follow safety guidelines to avoid electrical injuries. Here is a step-by-step guide on how to replace a thermostat for a furnace:
Step 1: Turn off the power
Locate the main service panel and shut off the power to your thermostat, furnace, and air conditioner. This is an important safety measure to prevent electrical injuries when working with the wiring.
Step 2: Remove the old thermostat
Most thermostats can be removed by pinching the sides of the faceplate and pulling it towards you. Loosen any screws attaching the wall plate to the wall and detach the old thermostat, leaving only the wires exposed. Take note of the wiring configuration as you disconnect the old thermostat, as this will be important for installing the new one.
Step 3: Check the voltage and wiring
Double-check the voltage information on the back of the old thermostat's faceplate to ensure compatibility with your new model. If you are upgrading to a smart thermostat, you may need to locate or install a C-wire. Check your HVAC control board for a wire connected to the C terminal.
Step 4: Install the new thermostat
Follow the manufacturer's instructions for wiring your new thermostat. Pay close attention to the correct placement of wires, matching the colours or letters on the wires to the corresponding receptors on the new thermostat. Secure the new thermostat to the wall using the provided screws.
Step 5: Restore power and test
Restore power to your heating/cooling system and press the reset button to clear the program memory. Program the new thermostat according to the manufacturer's instructions. Test the unit to ensure that the furnace and air conditioning unit are cycling properly. Adjust the settings to ensure the furnace and air conditioner turn on at different times.
Troubleshooting
If the thermostat does not work properly, review your steps and refer to the user manual for guidance. You may need to install batteries for the thermostat to operate.
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Bleed the line
Bleeding your fuel lines is the process of getting the air out of your fuel lines after your tank has run empty. This can be done by hiring a professional or following the steps outlined below.
First, ensure that your tank is full. Next, turn off the furnace by flipping a switch on or near the furnace or turning it off at the breaker. Find the manual for your furnace to determine whether you will need an Allen key or a wrench to fit the bleeder valve. Place a container underneath the bleeder valve to catch any oil that drains out. If the bleeder valve is in a hard-to-reach spot, attach a 1/4-inch nylon tube to the valve and place the other end in the bucket.
Locate the bleeder valve, which is usually a metal hex nut or a rubber plug found near the fuel pump. Loosen it slightly, then tighten it again to prevent oil from dripping out. Turn on the furnace and unscrew the hex nut until oil begins to flow out. Let the oil drain into the bucket until a solid stream of oil comes out. If the furnace cycle stops before the oil flows out smoothly, push the reset button again. Tighten the screw once the air is out of the lines.
If the furnace cycle ends before the air and fuel mixture stops sputtering, push the reset button again until the furnace pushes out all the air from the line. If the furnace still doesn't restart, check the line for air again by repeating the bleed process.
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Frequently asked questions
In an emergency, turn off electrical power to the Heating or Cooling Equipment. This can be done at the Emergency OFF electrical switch, which is usually a red switch plate located outside of the boiler or furnace room, often on a wall near a doorway.
Visit your thermostat and switch the mode from "heat" to "off" or from "heat" to "cool". If you have a programmable thermostat, adjust your temperature settings for the warmer months or disable any heating programs set for winter.
If your furnace has a pilot light, find the valve on the gas line running to your furnace and turn it to the "off" position (perpendicular to the gas line). If the gas valve is a lever, the valve is off when the lever is at a right angle to the piping. If the gas valve is a round handle, turn the valve fully clockwise.
