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To answer your questions, in a drop ceiling, you would probably want to mount the furnace horizontally. This is done, typically, with strut material (see here) and threaded rod coming from the ceiling.The condenser on the roof is typically just set on a plastic pad with the right dimensions for that particular condenser. As far as the gas line, with 3 furnaces, I would run 1-1/4 inch gas line as the main line feeding the furnaces. You can then reduce down when you get to each furnace.
When you hang the furnace with strut material this will be a pri***** *****d. Is it normal practice to have a secondary hand?
What would happen if a 1 inch pipe was used as the main line?
During the installation process of a split system gas heat and ac what are the key things to do to have a successful installation with least amount of problems?
I'm not sure I understand your first question. You could run 1 inch pipe, but may have trouble during cold weather when all three units run at the same time. May not have proper pressure.
As far as installation, it is a very important part of the process. Make sure on the air conditioning part that the system is properly evacuated and that all air and moisture is taken out. Use a filter-dryer in the liquid line. On the furnace part, the best advice I can offer is follow the installation manual to the T. This will tell you the proper way to mount a furnace horizontally and how to properly vent the furnace (and drain condensate if it is a high efficiency model).
"Make sure on the air conditioning part that the system is properly evacuated and that all air and moisture is taken out. Use a filter-dryer in the liquid line"
Can you please describe the procedure on the above comment.
When any air conditioning system is installed, a proper vacuum must be pulled on it prior to putting into service. Typically this is done to at least 500 microns using a micron guage. The filter drier goes in the liquid line.
Here is an example of a liquid line filter drier which is brazed into the liquid line side of the system near the outside condenser.
Let me know if you have additional questions. Otherwise, good luck! Thank you for using Just Answer and please don't forget to rate my service as that's how experts get paid (Thanks in advance for any bonus left). Otherwise experts work at their own time and expense. Feel free to post back with any additional questions.
Let me know if you have additional questions on this. Otherwise, good luck! Thanks for using Just Answer and please don't forget to rate my service as that's how experts get paid (thanks in advance for any bonus left). Otherwise experts work at their own time and expense. Feel free to post back with any additional questions.