Having an issue with my chiller not turning off.

dstroy

Well-Known Member
SO the 125 & 28V are fine because they’re here higher than 120 & 24?
The coil is 12vdc, and the contacts are rated for up to 250vac 10a 50-60hz. It is a direct replacement, different manufacturer.

It’s super simple to replace, just desolder the old one, cut the pin on the new one to match the old one and then solder the new one on.
 

Airwalker16

Well-Known Member
The coil is 12vdc, and the contacts are rated for up to 250vac 10a 50-60hz. It is a direct replacement, different manufacturer.

It’s super simple to replace, just desolder the old one, cut the pin on the new one to match the old one and then solder the new one on.
OK can you determine which relay it is?
 

Airwalker16

Well-Known Member
You can find out which relay it is. Follow the trace on the pcb back from the wire that goes to the compressor/fan. Whichever relay that trace goes to is the one to replace.
So if RED is Cool the its the relay nearest the thermistor connection?2017-12-03 05.30.30.jpg 20171201_101002.jpg you'll need a straight on pic for the traces to know huh...
 

Airwalker16

Well-Known Member
@dstroy I have a question for you. I understand how this relay circuitry works a little bit better now. But my question is where the solder joint that is very thick is connected to both commons on the relays, when power is applied to them and the coil is energized to pull the normally open arms to closed, how does each relay get turned on independently when the commons are connected?
 

dstroy

Well-Known Member
@dstroy I have a question for you. I understand how this relay circuitry works a little bit better now. But my question is where the solder joint that is very thick is connected to both commons on the relays, when power is applied to them and the coil is energized to pull the normally open arms to closed, how does each relay get turned on independently when the commons are connected?
You just asked why a switch is a switch. Because it does what it is.

They share a common “supply”, which is AC mains voltage and what is being “switched”, not the 12vdc that actuates the relay. The 12vdc is probably stepped down by that regulator to 5vdc or 3.3vdc which goes to the micro controller and the micro controller has a separate output pin for each circuit it controls. In this case there are two output pins that control relays. All of the stuff that runs on DC voltage shares a common ground, which is not the same as an AC “ground”.
 

HydroRed

Well-Known Member
Top