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31 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What's is the minimum service clearance to the control side of a boiler? |
18" |
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What type of furnace does the air discharge out of the bottom? |
Down Flow |
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A unit heater requires a clearance to combustibles from the back and sides of? |
6" |
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A category 1 appliance..... |
Has a positive vent pressure |
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A condensing (heating) appliance will generally have a vent temperature of no more than? |
125°f |
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The range of efficiency (seasonal) that applies to Category 1 fan-assisted heating appliances is? |
78% - 83% |
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Rating plate efficiency does not take into account; |
The Flame Quality |
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The minimum length of hose permitted for a construction heater is? |
15ft |
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Flame rectification relies on the ____________ of the flame? |
Conductivity |
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Typical spark ignition voltage for an IPI system would be? |
10KV dc - 30 KV dc |
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On a flame safeguard system using flame rectification, the rectified signal is generally in the range of? |
1-10 DC uA (Micro Amps) |
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The minimum spark gap for a IPI pilot assembly is? |
1/8" Gap |
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The VA rating on a transformer indicates? |
The capacity rating |
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Can a ECO on a commercial water heater can be bypassed? |
No |
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If the high limit is installed on the primary voltage what does it control? |
Transformer |
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After removing power, to isolate the 24 volt gas valve, you would use which type of meter? |
Ohm meter |
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The Hugh limit on a forced air furnace is normally set between? |
Between 180°f and 250°f |
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The fan control on a forced air furnace is generally set at? |
130°F cut in 90°F cut out |
Cut in and cut out |
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Air Supply includes? |
Dilution Air Excess Air Combustion Air |
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A combustion air opening must be located? |
No more than 12" above and 24" horizontally from the burner of the largest input appliances & No more than 18" and no less then 6" above the floor |
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Primary Air is defined as being? |
The air mixed with the gas before it's ignited. |
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A ventilation air opening from a structure to an enclosure must be located? |
No lower than the lowest draft hood appliance & As high as practical |
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Excess Air volumes are accurately measured by? |
In the flue gases of the heat exchanger |
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Automatic motorized combustion air louvers must be? |
Interlocked with the gas valve |
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The total height for a vent or common vent is measured from? |
The highest draft hood outlet to its termination & The same as you would measure the total chimney height |
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The minimum effective vent height of Type B vent is _____ ft? |
5' |
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The minimum gauge material allowed in a vent connector is? |
28 |
GSG |
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What is the smallest vent allowed in a venting system? |
3" |
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What is the minimum clearance a heater in a storage garage can be installed from combustibles? |
18" |
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A residential gas dryer is never to be vented into? |
To the inside & to a vent system serving other appliances |
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The valve that must be on all propane cylinders is? |
Relief valve |
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