Help with Buffalo Air Handler data

[Golestan]

Hi,
We are working on an older building (built around 1972) that is supplied by a large Buffalo air handler unit. What I have from the name plate is this:

Shop Order # 71N-7303
Size 390-Type BPCM

It is now run by a VFD but I think originally was not.
I would like to know the design CFM and capacity etc…for this unit. Can anyone help please...
thanks,

 

[randyat1001]

Buffalo air handler is still in business, located in southern Virginia.I can get their number if you need it. We have their units in our Hospital

 

[willard3]

I have data for 390 model J units with low, medium and high presasure BLD fans....do you know the pressure at which the fan runs?

 

[Golestan]

I believe this unit is a medium pressure system. As I mentioned, at present the fan is controlled by a VFD, at about 50% speed.

 

[willard3]

Commercial use for a 390 with a 40.5 inch fan is 34K to 42K cfm and the fan operates from 2.5" to 5" wc SP.

30 hp (2.5")-50 hp (5") motor.