Service Water HVAC

Question 1

What temperature is the SSW pump rooms, MCCs and traveling screen motor rooms kept at?

Answer 1

> 60F(minimum design temperature)

Question 2

Describe the SSW ventilation pump room supply fans operation.

Answer 2

1. Run – Starts the supply fan and modulates the outside air, recirculation and exhaust dampers to maintain temperature and AUTO exhaust fan starts.
2. Auto
   
   • 1st fan operates 82F – 74.5F
   • 2nd fan operates 99F – 91.5F

Question 3

Describe the SSW ventilation pump room exhaust fans operation.

Answer 3

1. Run – starts fan
2. Auto – Exhaust fan starts anytime associated supply fan starts.

Question 4

When do the SSW ventilation supply and exhaust fans trip?

Answer 4

Supply and exhaust fans trip on low flow (20,100scfm / 20sec

Question 5

Describe the operations of the travelling screen room supply fans.

Answer 5

1. Run – starts fan and controls dampers (62F closes outside damper and opens recirc)
2. Stop – fan stops, outside damper closes, recirc damper opens.
3. Auto – starts on low flow on running fan.
   
   • Normally one fan in Run and 1 in Auto. STBY fan starts on low flow on the running fan.