This company im working for hasn't done an audit of their HVAC system in 20+ years. They have a bunch of Modine CSC-1515 units in their warehouse that were manufactured in the mid 60's.
I have little experience in the HVAC field, and few resources at my disposal (Manual N for Load Calcs). I have the Design Specs of the units from a previous audit, but would like to calculate the Cooling Capacity of each unit and am having difficulty calculating the BTUH / Tons refrigeration output.
Any help with equations or references to such is appreciated.