Don't forget about those dampers
Basically I'm dealing with the same thing. Anyway, can I ask a few questions?
1) Why aren't you restarting the return fans starting first?
2) Why are return fan motors always smaller than supply fan motors?
3) Why do large buildings need both supply and return fans when residential and commercial (outside of resturants) always get away with one blower or a set of single blowers?
4) What is a coil freeze pump for? Are the spill air plenum dampers open such that the intake air dips below 32*F?
5) What is a "re-heat" pump for?
6) In a large system of supply and return fans- can't simple delays be added such that after a power failure return fan 1A starts after 5 seconds, supply 1B after 20 seconds, return 2A after 45 seconds, supply 2B after 60 seconds, return 3A after 75 seconds, ect? Alternate each fan over a 20 minute period? Same with exaust fans?