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32 Cards in this Set
- Front
- Back
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An evaporator coil must he installed at least |
at least 2-3in above the heat exchanger |
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A direct expansion evaporator coil |
has the controlled medium in contact with the coil |
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What type of evaporator coils ate commonly used in residential up flow systems with limited plenum space? |
an N flow |
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Rooftop package unit evaporators coils are commonly installed |
on the negative side of the blower before the heat exchanger |
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what is the minimum slope for a drain line? |
1/8” per foot |
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What are the symptoms of a TXV air conditioning system if it has lost its charge? |
Superheat will increase, low side pressure will decrease. |
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when is a P trap used? |
When the evaporator coils is on the negative side of the blower |
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When using galvanized steel as an auxiliary drain pan, what is the minimum thickness of the steel? |
26 guage |
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what is the heating value of a number 2 heating oil? |
140,000 BTU per Gallon |
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What is the common operating pressure of a high side oil burner? |
100 psig |
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What is the size of a fill pipe on an oil storage tank? |
2” |
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What safety feature is used on an inside oil storage tank that will protect against a house fire? |
a fuse-type globe valve |
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What is the size of an air vent on an oil storage tank? |
1 1/4 inch |
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What effect, if any, would a decrease of primary air have on combustion? |
It would increase CO2 percentage. |
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What effect if any, would an increase of primary air have on combustion? |
It would increase efficiency |
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What is the secondary voltage of the ignition transformer used on a high-pressure oil burner? |
10,000 volts |
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What is the purpose of an electrode in a high-pressure gas burner? |
its used to carry the spark to the point of ignition |
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what is the measurement of the spark plug gap on an electrode assembly? |
1/8” |
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The capacity of a high-pressure oil burner nozzle is rated in |
GPH |
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What are the three different spray patterns that are used on a nozzle? |
Solid, Semisolid, hollow |
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The spray angle ranges from |
30-90 degrees |
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What type of motor is used on a residential high-pressure oil burner? |
split-phase |
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What is the speed of the burner motor on a high pressure gun burner? |
1,725 or 3,450rpm |
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What is a common capacity of an indoor oil tank? |
275 gallons |
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What type of lubricant should be used in the burner motor of a high-pressure gas burner? |
10-weight nondetergent type oil |
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What are the three products produced in the combustion process? |
H2O, CO2, and N |
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A common C02 reading for an oil furnace is? |
10-12% |
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A common C02 reading for a gas fired furnace is? |
8.5-9.5% |
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What types of symptoms will be present if the sensing bulb of a TXV is not properly connected? |
High suction pressure and low super heat |
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On a standing pilot furnace, the thermocouple must be replaced when |
the millivolt reading is 22 or lower |
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If a combination has a new thermocouple and the pilot will not stay lit then… |
The gas valve needs to be replaced |
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Which way do you turn a gas valve regulator to reduce pressure? |
Counter clockwise |
