Well, all these posts later we still haven't got to it!
Had a conversation this morning with colleagues "in the business", meaning marine
A/C & heating
. Their take:
1. simple and very common problem
2. very simple solution.
This problem occurs frequently in large vessels as well as industrial buildings, large homes, etc.
The solution is to substitute a single compressor
controller for the separate controller found on standalone units. Apparently, every major manufacturer has such a beast, i.e., a single
controller unit which will control multiple compressors. These are programmable, so you can set the delay times as desired.
So, if I understand correctly, you'd connect the compressor
wires from all units to a single controller, as well as the thermostats, and set the desired parameters. Say you chose a delay of 10 seconds. So, if one compressor starts up, the other(s) cannot start until at least 10 seconds later.
This way, it doesn't matter if a second unit is running or not when the first compressor needs to start. If the second is already runninig, nothing happens...the first starts as normal. It also sets a 10 second delay so that no other compressor can attempt to start during that period.
Voila....what a thing :-)