Not exactly back to square one with 88 pages of knowledge, experience, and HVAC system application to your project friend. “Vendor issues”, what a perfectly all inclusive term that phrase can be.
I would again open the yellow pages under commercial and industrial HVAC contractors and try to solicit several more contractors to your facility to bid on a new HVAC system, after all the time and trouble you have already gone through it would be a shame if you had to “settle” for any one contractor at this point.
That is my take on this project at this time friend, and I know what this will mean to you having to call, arrange appointments, answer questions, and then call the contractor’s back to get them to bid this project, but if your job was that easy then anyone could handle it right…………..
Lastly, once again I have to say that not all commercial contractors conduct business and have the limited knowledge regarding your particular application like the ones you have unfortunately been dealing with, so look up, you may yet find a great contractor for both your installation project and your future P/M service friend.
John J. Dalton