I've tried to search for an answer to this, but can't find one. I have a Vintage Air system, and was trying to determine where I was going to put all of my A/C components. My system comes with a trinary switch that goes into the drier. The Vintage Air instructions can be a little vague at times, and I'm stuck trying to figure out how to wire in my trinary switch with my electric fans.
One thing I am not 100% sure on is the purpose of the trinary switch. I assume it protects from an over and under-pressure situation, but I don't know what the other purpose is.
My current BeCool fan setup is a dual SPAL configuration. Each fan is turned on by a relay that gets triggered from a grounding-type temperature sensor. I also have a BeCool relay that can turn on the fans when the A/C is turned on. Its this relay and the relationship to the trinary switch that I don't understand:
My 'turn on the fans when the A/C is turned on' relay basically justs gets a signal from the clutch wire (blue wire), and then grounds the temperature sensor for the fans, effectively turning them on. This relay does not have any power run into it, but rather just triggers a ground to turn on the fans.
The Vintage Air relay wiring 'documentation' that comes with the trinary switch (they don't provide the relay) is here:
I don't understand what the relay in this drawing is doing, and if I need it at all. I 'assume' that what is happening is its turning on the fans when the A/C is turned on. If that is the case, then I would just run my blue wire from my existing relay into the blue wire on the trinary switch, right ?
What I'm lacking is knowing what the trinary switch is wanting to see and what the other function is that it performs.