Is a fresh air intake necessary?

They are designed to draw air from the outdoors. That said, you will still benefit from installing a fresh air intake as these intakes improve indoor air quality and also wick excess moisture. Bottom line: Fresh air intakes are an absolute necessity for any home that has a furnace.

What happens if furnace exhaust is blocked?

If the exhaust flue is blocked, the inducer fan won’t move any air, and the pressure switch won’t trigger. The furnace won’t proceed to heat until the pressure switch is triggered. This is to ensure that your furnace has enough airflow for complete combustion and to remove gaseous byproducts from your home.

Are high efficiency furnaces safe?

High-efficiency furnaces may also be safer for your home. In some cases, the risk of carbon monoxide issues occurring with your furnace can be much lower when you use a high-efficiency option.

What causes high limit switch open?

Airflow issues usually cause a high limit switch to trip out. With less airflow going through your furnace, the heat exchanger excessively heats up and causes the limit switch to trip. Airflow issues can be caused by many different things such as: Dirty air filter.

What happens if there is not enough return air?

If there is not enough return air available, your HVAC system will not heat or cool properly. They must be properly sized — Return air ducts must be large enough to carry a sufficient amount of expended air back to your furnace, air conditioner, or heat pump.

How do you size a fresh air intake?

In order to size fresh air intake into attic spaces from the eaves to feed interior ceiling air inlets, take the total ventilation (in cfm) that will be provided by the fans and divide that number by 400 feet per minute.

How do I clear my furnace exhaust pipe?

Scrub the inside free of any dust and debris; then use the handheld vacuum to get out as much as you can. Wipe it clear with a rag or soft cloth and then replace the cap. Cut away any branches or remove any object that might be obstructing the pipe and creating debris. The vent should always be clear.

How do you remove a furnace exhaust pipe?

Access the furnace through the door on the furnace closet. Loosen the clamp where the lower end of the vent attaches to the furnace using the screwdriver or nut driver. Pull off the end of the pipe from the flange. Tap the pipe with the hammer, if necessary, to dislodge it and pull it off the flange.

Why do high efficiency furnaces use PVC pipe?

This combination of carbon dioxide and water would damage the type of vents used in conventional systems which run vertically out of a home. To combat this issue, high efficiency condensing furnace uses PVC pipes to extract the acidic water from your home.

Can you install a high efficiency furnace with only one pipe?

It’s perfectly acceptable to have a high-efficiency furnace installed with one pipe. Just flip through the pages of any high-efficiency furnace installation manual and you’ll find the answer.

Can I bypass a high limit switch?

Yes, you can bypass the high limit switch for testing.

Can you reset a high limit switch?

High limit switch is one little known about sensor that will shut off the furnace when it overheats. This switch however, can send your furnace into a lockout mode. To resolve this problem, you’ll need to service the furnace thoroughly then try to reset the limit switch manually.

Will a new furnace affect my existing flue pipe?

Simply put, your new furnace may not be compatible with your existing flue pipe. A technician must carefully analyze your existing system to determine whether your flue pipe requires changes to promote adequate venting. 3. High-Efficiency Furnaces Use Draft Inducers

What are the pipes coming out of my furnace?

What are the Pipes Coming Out of My Furnace? | P.K. Wadsworth Heating & Cooling If your furnace is 90% efficient or greater, you probably have PVC pipes coming out of the wall of your home that look something like those pictured here.  These pipes allow the furnace to intake fresh air and to safely vent flue gasses out of the home.

What type of pipe is used in a gas furnace?

Most furnaces use one of the following pipe types; Copper, galvanized steel, and iron pipes are the most common piping materials in traditional gas heating systems. Why?

How does a high-efficiency furnace work?

High-efficiency furnaces can be vented via the sidewall using one pipe (indirect venting) or two pipes (direct venting). Single-pipe venting only includes one pipe to remove exhaust fumes out of the furnace as these furnaces draw air for combustion from inside the house. It’s similar to how your wood stove works.