EDG HVAC. Flashcards
1
Q
what causes the “auto lead” fan (recirc fan 412) to start?
A
- EDG starts*
- LOP/LOCA level 1 (sequenced @ 30 seconds)
- hi temp (A-D: 104F, E-H: 115F)*
*recirc fan will run for >45 minutes after starting with EDG running.
2
Q
what causes the “auto” fan (recirc fan 412) to start?
A
- EDG starts AND high temp (A-D: 104F, E-H: 115F)*
- low flow trip of running fan
- LOP/LOCA level 1 (95 seconds)
*recirc fan will run for >45 minutes after starting with EDG running.
3
Q
what fans will lose power during a LOP?
A
DAS and DAE fans.
4
Q
what fans will be sequenced on during a LOP?
A
both DAPRS fans (408), all switchgear room coolers (401), and all EDG room recirc fans (412).
5
Q
why do WAE (wing area exhaust) fans have a pushbutton override?
A
to clear smoke.
6
Q
how are the 1E battery and exhaust fans controlled (not by sequencer)?
A
not sequenced individually, but will restart upon power being returned to the bus (no undervoltage trip).
