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20 Cards in this Set
- Front
- Back
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Flow control valve |
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Combination gauge |
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Limit and operating control |
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Drain valve |
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Pressure reducing valve |
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Diaphragm expansion tank |
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Safety relief valve |
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G - temperature gauge |
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Flow switch - mandatory low mass boiler over 400 MBH |
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Circulator |
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B - line scoop C - automatic air vent |
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What is the purpose of diaphragm expansion tanks? |
Allows for the continuous expansion and contraction of water within a closed system |
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What is the purpose of a low water cut-off (LWCO) |
automatically cuts off the fuel supply when the surface of the water falls to a certain level determined by the boiler manufacturer |
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What does a combination gauge read? |
Pressure Feet of head Temperature |
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What is the purpose of line scoops? |
Basically, it separates the gasses from the water leaving the boiler (similar to a boiler fitting) |
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What is the purpose of an automatic air vent? |
Installed at high points in the system to remove gasses that were not removed by devices located in close proximity to the boiler |
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What is a circulator? |
the pump in a closed loop system |
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What is the purpose of pressure reducing valves? |
Reduces the city water pressure to a better working pressure for the system. Also used to maintain a minimum pressure in the system. |
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How far off the ground should the discharge pipe on a safety relief valve be? |
No more than 12" off the floor and, At least one pipe diameter off the ground |
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What is the purpose of flow sensors and flow switches? Are they installed on low mass, or high mass boilers? |
A type of safety device that prevent boilers from overheating. Installed on low mass boilers |
