PW1100G in depth start-up sequence
Hi all
So the PW1100G has this "cooling" period during startup. During this phase, N2 is kept below 10% and the fan is not moving at all. I've been wondering the following:
- How is the N2 maintained? Is the starter valve modulated, not a simple on/off valve?
- Why does the fan remain stationary? Is it just a matter of internal friction vs low N2 not producing enough force to spin it, or is there some mechanism in place to hold it?