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Flashcards in Heating Hot Water Systems Deck (7)
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1

What do heating hot water systems do?

Provide hot water for VAV RH boxes and main heating coils in AHUs

2

How to condensing boilers work?

They use the condensing of water vapor in the flue gas to increase heat transfer/efficiency of the boiler

3

What are the other components of a HHW system

Pumps (for boiler and building) coils (VAV RH and AHU) Cold Start Vale (for non-condensing) and chemical pot feeder.

4

Why does your boiler need minimum FLOW?

To prevent overheating or boiling

5

Why does your boiler have minimum & maximum TEMP?

Max temp 190F to prevent boiling. Min temp in non-condensing boilers only is to prevent condensing.

6

What are instrumentation and controls for boilers?

Flow (switch and meter). Temp and DP sensors.

7

What is a cold start valve do?

Maintains minimum return temp to boiler