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55 Cards in this Set
- Front
- Back
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How do you get the net temperature |
Temperature of the flue gases minus the ambient temperature |
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Atmospheric type burners are designed to supply |
50% more combustion air than is actually required |
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Atmospheric draft operate under |
Slightly negative pressure(-0.02to-0.04"wc) |
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Natural draft operate |
Using a mechanical device for positive combustion air pressure to the burner and negative pressure throughout the remaining flue |
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Force draft use |
Positive draft throughout the system |
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What is flue gas temperature AKA stack temperature |
Is the temperature of the combustion gases as they exit the appliance |
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What is air made up of |
80% nitrogen 19% oxygen and 1% other |
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Taking a o2 reading can assure you that |
You are on the positive side of the stoichiometric curve |
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What is the most widely used measurement of an appliance heating efficiency |
Annual fuel utilization efficiency(AFUE) |
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When measuring CO2 Co O2 and fuel gas temperatures where's the best place to take the sample |
Upstream of the draft diverter / Hood barometer control or any other opening which allows room air to enter the dilute flue gases |
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On a fan assist Appliance the combustion and draft test should be done |
Immediately Downstream of the inducer fan |
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Equipment with a economizer or other similar device requires the sampling point B |
Downstream from and as close as possible to the device to ensure that the net stack temperature will provide an accurate indication of the effectiveness of the entire system |
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Too much air is admitted to the combustion Zone the results Maybe |
Cooling of the flame to the point where the carbon is converted to carbon monoxide instead of carbon dioxide |
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Oxygen readings should be within |
3% to 9% |
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If Perfect story stoichiometry combustion of natural gas occurred the maximum amount of CO2 that could be produced would be |
12% |
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Typical readings of CO2 for complete combustion would be between |
7 to 10% |
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If the amount of excess air introduced to the combustion zone is grossly exaggerated the results would be |
Cooling of the flue gas to the point where there is not enough heat to burn the carbon |
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To determine the net flue-gas temperature |
Ambient temperature is subtracted from the actual temperature of the flue gases |
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Before starting any combustion testing you should be sure to |
That appliance stores are in place in clean-out openings are covered and sealed |
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Approximately what percentage of the air is nitrogen |
80% |
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What type of combustion should be achieved in a gas burning Appliance |
Complete combustion |
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Which portion of the Air Supply is required for complete combustion |
Excess air |
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Which Port of the combustion Air Supply is adjusted for burner efficiency |
Excess air |
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What can you smell in the combustion by-products |
Aldehydes |
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What does PPM refer to |
Parts per million |
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How is the net flue gas temperature determined |
Ambient temperature is subtracted from the temperature of the gas is taken up stream of the draft control device |
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What happens to the efficiency of the appliance if the primary air shutter is adjusted |
Little or no difference in efficiency |
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When conducting flue gas analysis what is the ultimate amount of carbon dioxide for natural gas |
12% |
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Why is excess are necessary in the combustion system even though it may not be used for combustion |
Assure complete combustion of the fuel |
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Where should the flue gas sample be taken from |
In the combustion chamber Upstream of the draft control device |
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What two readings are required to determine the combustion efficiency of an appliance using the nomograph |
The net flew gas temperature and the carbon dioxide content |
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What is an acceptable vent draft reading on an atmospheric Appliance |
-0.03 in WC gauge |
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Who is responsible for the safe combustion and operation startup of a gas Appliance |
The installer |
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Who is responsible to ensure that all relevant code requirements are met |
The installer of the appliance |
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What should be done with the manual supplied with the appliance |
Leave them with the appliance |
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What are the limitations for a gas fitter working with electrical components |
Maximum 150 VA / DC and 100 VA / AC |
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Who are the gas Appliance approval agencies that are accredited in the province of Alberta |
Csai, its, and ulc |
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What are the two classifications of boilers |
Steam and hot water |
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What is the maximum pressure for a low pressure steam boiler |
15 PSIG |
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According to Asme what are the maximum settings for a low pressure low temperature hot water boiler |
160 PSIG and 250 degrees Fahrenheit |
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What is the difference between a fire tube and water tube boiler |
The fire tube has Hall combustion products inside the tube |
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What is required on a horizontal firetube steam boiler that would not be required for a vertical flue steam boiler |
An induced draft fan or power burner |
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What is the typical minimum positioning for the fresh air dampers on a rooftop HV AC unit |
10% open |
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What is the purpose of an economizer on a rooftop HV AC unit |
This allows cool outdoor are to be brought into the building to get free Cooling |
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What are the three controllers included with the economizer |
Outdoor changeover control mixed air control and minimum position control |
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Where should the indirect fire make-up air unit be installed |
Where large amounts of exhaust are needs to be replaced |
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What is the difference between a direct fired and indirect fired make-up air heater |
There's no heat exchanger in a direct fired unit |
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Typically what is the temperature rise through a makeup air unit |
100 degrees Fahrenheit |
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What distance above the floor is required for an appliance installed in residential garage |
Component capable of igniting the flame Vapor must be located at least 18 in above the floor |
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When appliances without flame safeguards are installed under a fume exhaust Hood what required requirements must be met |
The fire suppression system interlocked with gas supply |
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What code book is used for the installation of Field constructed gas-fired Appliance |
B1 49.3 |
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It's the code conflicts with the appliance installation instructions what do you do |
The code shall prevail |
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Fire tube boiler |
The flue Gas Pass inside the tubes and heat the medium water / fluid directly through the steel tube exchanger the fluid medium surround the tubes |
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Water tube boiler |
Water passes inside the tubes in the flue gases surround the tubes to heat the water |
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What is the velocity of the Airstream passing over the barren are in the direct fired make-up air heater |
2500 and 3300 feet per minute |
