Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
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 |
|
|
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 |
|
|
180•F max temp on a______ boiler |
Gravity boiler |
|
|
One pipe system uses a ______ Tee |
Venturi |
|
|
Direct system is a _______ supplied and ______ returned |
First First |
|
|
Reverse returned ( balanced ) ______supplied, _____returned |
First Last |
|
|
Sight tubes are required on ________boilers |
Steam boiler |
|
|
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 |
|
|
Backflow device |
Stops reverse flow of boiler water back into H W H systems |
|
|
Pressure reducing valve |
Reduces city pressure to desired working pressure in a closed HWH system |
|
|
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 |
|
|
Return shut off valve |
Isolated boiler from return piping system |
|
|
Supply main shut off |
Isolates boiler and system piping from supply water |
|
|
Unit shut off |
Isolates individual heat transfer units from supply piping |
|
|
Automatic Air vent |
The automatic air vent is installed in the system to remove gases from the heating system |
|
|
Heat transfer unit |
Transfers heat from hot water to surrounding air |
|
|
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. |
|
|
Combination Guage |
Indicates pressure, feet of head and temperature |
|
|
Safety relief valve |
Safety relief valve protects against excess pressure from thermal expansion |
|
|
Supply shut off valve |
Isolates boiler from supply piping system |
|
|
Temperature guage |
Indicates temperature in boiler or near outlet and temp of return water |
|
|
Pressure guage |
Indicates pressure before and following the pump |
|
|
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 |
