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32 Cards in this Set
- Front
- Back
One Boiler BHP( Boiler Horse power ) is equal to |
33470 BTU |
|
Net rating is |
After the transmission losses |
|
max operating temp of low temp high mass boilers? |
120•C |
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400,000 BTU _____________is needed |
Low water cut off |
|
Low mass boilers need |
Flow sensor |
|
You need _____pipe diameters on either side of a Flow Switch |
5 |
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180•F max temp on a______ boiler |
Gravity boiler |
|
One pipe system uses a ______ Tee |
Venturi |
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Direct system is a _______ supplied and ______ returned |
First First |
|
Reverse returned ( balanced ) ______supplied, _____returned |
First Last |
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Sight tubes are required on ________boilers |
Steam boiler |
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Limit control detects ___________ |
dangerous High Limit temp |
|
Diaphragm expansion Tank |
The diaphragm expansion tank allows for continuous expansion and contraction of water within a closed system |
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Backflow device |
Stops reverse flow of boiler water back into H W H systems |
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Pressure reducing valve |
Reduces city pressure to desired working pressure in a closed HWH system |
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Quick fill by pass valve |
Allows for quick filling of system rather than waiting for all the water to go through PRV |
|
Inline circulation pump ( circulator) |
Circulates water within closed HWH system |
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Return shut off valve |
Isolated boiler from return piping system |
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Supply main shut off |
Isolates boiler and system piping from supply water |
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Unit shut off |
Isolates individual heat transfer units from supply piping |
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Automatic Air vent |
The automatic air vent is installed in the system to remove gases from the heating system |
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Heat transfer unit |
Transfers heat from hot water to surrounding air |
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Operating control |
Limit control used to maintain variable condition within a set of desired range of values |
|
System pressure differential bypass valve |
Ensures the pump does not dead head. |
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Combination Guage |
Indicates pressure, feet of head and temperature |
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Safety relief valve |
Safety relief valve protects against excess pressure from thermal expansion |
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Supply shut off valve |
Isolates boiler from supply piping system |
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Temperature guage |
Indicates temperature in boiler or near outlet and temp of return water |
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Pressure guage |
Indicates pressure before and following the pump |
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Flow control valve |
Prevents gravity circulation from occurring within the piping system |
|
Heat transfer units |
Transfers heat from hot water to surrounding air |
|
Backflow |
The automatic air vent is installed in the system to remove gases from the heating system |