Where does combustion take place in a furnace?
combustion chamber
What is a combustion furnace?
When we say a furnace is “sealed combustion,” it means it draws on air from outside the house to use for burning fuel (i.e. combusting fuel). The jets of the burners in a gas furnace must have air to mix with the gas, and in the standard “atmospheric furnace,” this air comes from within the house.
Are gas furnaces dangerous?
Some of the dangers of an old furnace are: Carbon Monoxide Poisoning: Arguably the biggest danger of an old gas furnace is carbon monoxide poisoning. Carbon monoxide is an odorless and colorless gas that can cause nausea and dizziness. Overexposure to this gas is deadly.
What is induced combustion gas furnace?
An induced-draft burner uses a blower to pull air into the burner, and through the combustion chamber and heat exchanger. The fan then pushes the flue gases out through the vent. This creates negative pressure in the furnace, and may create positive or negative pressure in the venting systems.
What ignition does a forced or induced draft system use?
Forced-draft system have a combustion blower motor on the inlet of the heat exchanger, they push or blow combustion gases through the heat exchanger and cause a positive pressure in the heat exhanger.
Why do modern furnaces no longer use standing pilots?
Standing pilot lights are being steadily phased out as more modern electronic ignition systems come into play. There are many reasons for this. Standing pilot lights are notorious for going out at the drop of a hat, mostly due to their being almost completely unprotected from air flow in the house.
Do modern gas furnaces have pilot lights?
Newer gas furnaces (since about 2010) do not have a traditional pilot light that burns all the time. Instead they use electronic ignition systems that light only as needed. Constant flame or “standing pilot” heating systems are still fairly common in older homes, and they can still be repaired in most cases.
What is the advantage of a standing pilot for a furnace?
What’s the one advantage of a standing pilot for a gas-fired space heater? A. Being able to be used where heat may only be used for a limited time such as a vacation property.
How does a standing pilot furnace work?
A standing pilot gas furnace uses a small, continuously burning flame as a source of ignition for the main gas burner. When the thermostat calls for heat and prompts the main gas valve to turn on, the pilot light ignites the larger flow of gas to the burner from the main supply.
Is electronic ignition better than pilot light?
Electronic Ignition vs Standing Pilot – The Final Analysis That makes electronic ignition gas ignition systems more efficient than standing pilot systems. After this, the conclusion is that the electronic ignition gas ignition systems are more efficient and just as reliable as the standing pilot gas ignition system.
What is the purpose of excess air in furnace combustion?
What is the purpose of excess air in furnace combustion? Excess air insures that all the gas is burned by making sure there is plenty of oxygen available.
What is the effect of excess air in combustion?
Excess air increase the amount of oxygen to the combustion and the combustion of fuel. The combustion efficiency increases with increased excess air – until the heat loss in the excess air is larger than the heat provided by more efficient combustion.
Are 80 Percent furnaces being phased out?
This is a big change coming in residential & light-commercial furnaces. Effective June 1, 2013, federal law requires that minimum furnace efficiency in the Northwest must be 90%. That means that 80 percent furnaces cannot be installed after that date.