I am an air balancer and have an upcoming contract where the engineer is requesting balancing to be completed on them. I have retrieved as much information as possible from these units and have gotten some info and contracted trane but no one seems to help me. Does anyone here know anything about the units? Balancing procedure/shop manual/etc?

Model V.C.O.N.
Coil size A
Nozzle Type 0
P.A. Damper M
S.O number G-1179-70

I am not sure what the S.O. number stands for.
Any help would be appriciated.

Thanks in advance.