How Do You Drain a Furnace?

To drain a furnace, you'll generally need to remove the cap from the drain, connect a hose, and open the drain valve. However, the specific steps can vary slightly depending on the type of furnace you have (e.g., an outdoor furnace). Below are general guidelines and then instructions specific to an outdoor furnace, the one mentioned in the provided reference.

General Furnace Draining Steps

1. Turn off the furnace: Disconnect the power to the furnace to prevent any electrical hazards.
2. Locate the drain: Find the drain valve, usually located near the bottom of the furnace.
3. Prepare for drainage: Position a bucket or connect a hose to the drain valve to direct the water away from the furnace.
4. Open the drain valve: Slowly open the drain valve to allow the water to drain.
5. Vent the system: Open a vent or bleeder valve at the top of the system to allow air to enter and facilitate drainage.
6. Monitor the drainage: Observe the draining process to ensure it is flowing smoothly.
7. Close the drain valve: Once the furnace is drained, close the drain valve.
8. Dispose of the water properly.

Draining an Outdoor Furnace

The provided reference details draining an outdoor furnace, which can have a slightly different process, especially regarding cleaning before draining.

1. Clean the Firebox: Completely clean out the firebox before draining any water from the outdoor furnace. This step is crucial to prevent debris from clogging the drain and damaging the system.
2. Locate and Prepare the Drain: Locate the drain.
3. Connect a Hose (Optional): Connect a hose to the drain.
4. Open the Drain: Open the drain to allow the system to drain.
5. Flush the System (Firebox and Water Jacket): Flush the top of the firebox and the bottom of the water jacket beneath the firebox. Use a wand inserted into the vent to accomplish this. This helps remove any remaining debris.
6. Dispose of Water Properly: Ensure the drained water is disposed of responsibly, following any local regulations.

Important Considerations:

• Safety First: Always prioritize safety when working with any appliance. Turn off power and gas or oil supply before beginning any maintenance or repair.
• Consult the Manual: Refer to the furnace's owner's manual for specific instructions and safety precautions.
• Professional Help: If you're uncomfortable with any step of the draining process, consult a qualified HVAC technician.