What is meant by the warm-air blowers off-delay timing? The amount of delay before shutting the fan off to allow the heat exchanger to cool and dissipate the furnace heat at the the end of the heat cycle.. DIP (Dual Inline Package switch..
Consequently, why is excess air supplied to all gas burning appliance burners?
Excessive air is supplied to all gas burning appliances to support combustion. The purpose of a gas regulator at a gas burning appliance is to? The purpose of a gas regulator at a gas burning appliance is to drop the pressure to the proper level (in.
Secondly, what is a 100 shutoff system? 100% shutoff system. A system in which when there is a failure in the flame-proving device system and both the pilot valve and main gas valve are shut down (closed).
Also to know is, what are the 4 types of gas furnace airflow patterns?
90 Cards in this Set
| The four types of gas furnace air flow patterns are_________, ________, _________ and___________ | up flow, down flow, low boy and horizontal |
| Natural gas, A. Is lighter than air B. Has approximately the same specific gravity as air C. Is heavier than air | A. Is lighter than air. |
What is the purpose of the fan time temperature delay switches used on gas furnaces?
Fan time/temperature delay switches are used on gas furnaces to allow the _____________________ to warm up.
Related Question Answers
What is soft lockout?
When this occurs, often after two or three failed restart attempts, the furnace is known to be in lockout mode and will not attempt to run again until the furnace is manually reset. It is important to note that there are soft and hard lockouts, which does vary by manufacturer.What is the difference between a hard and a soft lockout?
What is the difference between a hard and a soft lockout? A hard lockout allows a specific time for lighting or relighting. If this is exceeded it will shut down. A soft lockout allow a certain time for the lighting or relighting of the pilot or main burner.What controls the amount of gas entering the burner?
Adjusting the gas valve on the Bunsen burner changes the volume of gas flow; the more gas entering the burner, the larger the flame. The collar at the base of the barrel contains air holes to control the amount of oxygen reacting with the gas.What gas requires 100 off?
Liquified Petroleum gas
What is a smart valve?
The Smart Valve system uses a 24 VAC powered hot surface pilot gas igniter to ignite the pilot gas. The main gas is ignited in both instances by a pilot gas burner. The Smart Valve system is self-contained, thus eliminating the need for a separately mounted ignition source, usually in the furnace or boiler vestibule.How does flame rectification work?
Flame rectification is a phenomenon in which a flame can act as an electrical rectifier. This effect is used by rectification flame sensors to detect the presence of flame. The rectifying effect of the flame on an AC voltage allows the presence of flame to be distinguished from a resistive leakage path.Which condition will cause the flame to lift off a gas burner surface?
In short, too high a pressure at the burner face can cause flame lift-off. There is also a problem with a very low gas velocity or a very low flow.What is the purpose of dilution air?
Dilution air is the air that combines with the flue gases and lowers the oncentration of the emissions. There are two types of dilution air, natural and induced (artificially created). Time, Temperature and Turbulence. The combustion process is extremely dependent on time, temperature, and turbulence.What is a glow coil?
Glow coil. A device that automatically reignites a pilot light if it goes out. Hard lockout. Is a time period built into the module that allows for a certain time to light or relight the pilot or main burner.What would cause too much temperature difference?
Airflow Determinations Too low of an airflow will give you greater temperature differences across the coil than too much airflow. This greater temperature difference is caused from the air being in contact with the coil longer, thus decreasing its temperature coming out of the coil.What is excess air?
Excess air ensures that there is enough air for complete combustion. Excess air is expressed as a percentage of theoretical air required. Thus, 10% excess air indicates that 110% total air is being supplied. In boiler operation, excess air represents a heat loss.How do I reset my furnace lockout?
Most gas furnaces can be reset by shutting off the electric power, waiting 20 seconds and turning the power back on. Some furnace controllers will unlock after an hour or two and will try to operate again. Most oil-burning furnaces have a reset button on the burner that you press to restart the furnace.What four areas of the furnace electronic control board should you identify to help simplify troubleshooting?
List the four areas of an electronic control board that should be identified when troubleshooting. input, output, board ground, & power supply. Explain the reason why adding humidity to a residence increases customer comfort. The body does not evaporate as much, so the customer stays at a comfortable temperature.What is the typical manifold pressure for propane gas?
The typical manifold pressure for propane gas is _________in. WC. 10.5 to 11. Why is excess air supplied to all gas burning appliance burners?What is the difference between an atmospheric burner and a forced air burner?
What's the Difference? An atmospheric burner uses the natural process of gas escaping from the orifice to mix with primary air. A power burner forces air in with a mechanical blower and is therefore able to mix with greater amounts of gas while sustaining the required gas: air mix ratio.What is the proper color of a gas flame?
blue
Will a gas flame carry electrical energy?
A gas flame will carry electrical energy. with a heat content of about 1,050 Btu/cu.Why is it possible to use smaller vent pipes in higher efficiency units?
Why is it possible to use smaller pipes in higher efficiency units? Volume and temperature of flue-gases are lower. Efficiencies over 80% cause condensation but the flue gas is still too hot for PVC vent pipe until the efficiency reaches 90%. 
