I was recently looking at a job that requires the size in tons of rooftop units at an old walmart store. Most nameplate ratings were unreadable, but found 1 that I could get most data off of.

My question is that I need to know how much in tons the unit is:

Info from Unit:
John Zink Co.
3phase 480 Max Fuse 40 amps
Compressor 2 mtrs. 480 3 phase 7.8amps FL Each LR 54
Condenser 2 mtrs. HP 3/4 1075 RPMs 2.8 amps
Evaporator Blower Mtr. 1 mtr. 3 HP /480/ RPM 3480 4.3 amps

Heater: 20KW/480
Low side 150lbs
High side 300lbs.

Please advise...
Thanks