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52 Cards in this Set
- Front
- Back
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Forced air system heating heat the space from where to where? |
From the ceiling down |
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Baseboard heating Heats through? |
Convection |
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Fin baseboard is made of three components? |
Copper tube aluminum fins and enclosure |
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Radiant Heating Heats what |
Surrounding surfaces |
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Advantages of radiant floor heating over conventional forced air? |
•Lower temperature stratusfaction, •minimal air movement •and higher surface temperatures of objects in the room. |
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How is the response time for radiant floor heating? |
Slow |
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Radiant floor heating systems don't allow for? |
Air filtering, purification or humidification. Systems must be installed to maintain air quality. |
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Applications for radiant Heating? |
Residential, commercial, industrial, snow melt, Agriculture and sports field applications. |
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Three categories of tubing for radiant floor heating? |
Metallic, synthetic and composite. |
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The ability of oxygen molecules to pass through a material? |
Oxygen permeation. |
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Composite tubing consists of? |
PE/AL/PE A thin layer of aluminum sandwiched between two layers of plastic. |
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Recommended length for 3/8" copper? |
250' |
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Recommended length for 1/2 inch copper? |
300' |
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Recommended length for three quarter inch copper? |
500' |
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The rule of thumb recommended flow rate for residential? |
2 to 4 feet per second |
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Recommended floor temperature four areas where people stand? |
77 °f |
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Recommended floor temperature in dwelling or commercial spaces? |
88°f |
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Recommended floor temperature in bathrooms, swimming pools, and for foyers? |
91 °f |
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Balancing valves are not required if there is less than what percent difference between the longest and shortest circuit? |
10% |
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With heat loss calculations you must round up to the nearest? |
.25 / quarter inch of a foot |
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DTD is the difference between? |
Your IDT and your ODT |
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Transmission loss? |
Conduction through a material |
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For heat loss calculations what percent must be added for bathrooms? |
20% |
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R value is? |
The resistance to flow. IE- window. Wall. Or combination of products. |
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What requires you to know the pressure drop through a system, gallons per minute required and temperature drop through the circuit? |
Pump sizing |
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Where is the lowest pressure point in a pump and in radiant floor heating systems? |
At the inlet of the pump |
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Where is the best location for a pump? |
At the point of no pressure change. |
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What is required in order to properly size a boiler for an application? |
Total heat load required for the building |
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What recommendations should be followed when installing boilers? |
Manufacturer's recommendation |
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What type of boiler is best suited to Supply heating water directly to an in floor heating system? |
Condensing boiler |
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How many BTUs in one pound of water |
970 BTUs |
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Conventional boilers must operate at what temperature? |
Above 140°F |
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Condensing boilers operate at what temperature? |
Below 140 °F |
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What is the greatest advantage of hydronic heating over any other system? |
Multiple zoning |
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Which one of the following floor coverings has the greatest R-value? A) hardwood B) ceramic tile C) vinyl tile D) carpet and underlay |
C) vinyl tile |
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What three factors must you know in order to size tubing? |
•Gallons per minute flow rate, •length of the circuit and •design temperature drop through the circuit. |
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A typical velocity in a residential application is between? |
2 and 4 feet per second. |
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In a piping layout how much temperature drop is there across a circuit? |
15 to 20 degrees across the circuit |
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Good practice is to install tubing along an exterior wall at what spacing? |
6" |
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The counter flow pattern is used when heat loss is? |
Evenly distributed |
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Tubing should be fastened every? |
3 feet and on arches |
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What three factors must be known in order to properly size tubing for an application? |
GPM, velocity and length of circuit |
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What is the required minimum measurement when a pressure test is on for a radiant floor heating system? |
The greater of either 60 PSI or 1.5 x working pressure for 1 hour |
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What two factors are required to calculate header size? |
GPM and velocity |
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What is required when piping a low mass boiler that is flow sensitive? |
A bypass pump between the supply and return boiler piping |
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What is required when a conventional boiler is installed in a low temperature radiant floor heating application? |
A mixing valve |
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What is the first step in servicing a boiler venting and Main burner? |
Turn off the electrical and gas supplies |
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What is the best way to clean a main burner? |
Vacuum and soft brush |
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What type of thermostat is used on a hot water heating system? |
A thermostat without a heat anticipator. |
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A loose wire on an aquastat may? |
Prevent to the main Berner from firing. |
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What will happen to a non-condensing boiler when the return water temperature is too low? |
There will be unnecessary damage and boiler failure. |
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What is the code for hydronic heating systems? |
B 214 |
