I have been running a JBJ DBA-150 for years. Super reliable, trouble free, works well to keep my tank temp in check.
I do not have central air, so in the summer months in NE, it gets a good workout.
However, one thing that's always bother me was the cycle. If left to it's own internal thermostat, the temp
would rise to hi before it would kick in, then go to low before turning off. Sometimes the heater would kick in
then the two would fight.
So to remedy (band-aid) this, I would use my Apex to control the chiller. I had much more precise temp control,
and could monitor if the chiller or heaters were on at the same time.
The issue using this method is with the Apex cutting power to the chiller, the logics of the chiller goes thru
a "boot up" stage and is delayed starting. Also the chiller display is off until power up. There never was a
problem with the chiller losing it settings, due to it using Flash Memory. Matter of fact,
after a 3 year break, I plugged it in and and all my old setting were in intact!
My plan is to leave the chiller powered up, with the setting slightly cooler than I want my tank, and use
one of the 24vdc Outputs on the EB832 to control a 24vdc relay that in turn will control power to the compressor.
The main logic would be on, (no boot-up) the display would be lit, and when the Apex calls for a cooling cycle,
it would be instant.
Has anyone ever tried this? I know my way around machine controls just enough to get myself in trouble,
so I understand the circuitry, so I am hoping to hear from the HVAC guys to why it would/wouldn't work.
Chiller
JBJ 150.JPG
Got to love the wire color code!
JBJ Wiring Diagram.JPG
Using the above schematic, I would splice into the White and Brown(Brawn) going from the Temperature Controller
and connect to the movable contacts on the relay, then from the NO contacts to the Compressor.
24vdc from the Apex would power the coil.
Not actual relay (picture reference only)
Relay.jpg
I welcome your comments.
TIA
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