How I Connected Relays to A/Cs - Printable Version
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RE: How I Connected Relays to A/Cs - David and Teresa - 08-14-2017
Well, I ordered and received the relays. I want to mod the front AC before trying to figure out the dual rear unit. My front unit is a single compressor and the control pcb is half the size of the dual unit. I'm still studying the drawing and have a couple of questions. It looks like the fans still receive ac from the circuit board. And, it looks like 120 VAC input is still connected and the 120VAC that used to feed the compressor now feeds the external relays. So, the relays on the pcb still need to work to turn on the external relays. Am I getting this right?
RE: How I Connected Relays to A/Cs - bikestuff - 08-14-2017
David,
Exactly! The logic stays on the board and all we are trying to do is to route the power from another source. The relays on the board now only actuate the relay which then takes power and sends it to the compressor.
Note that the board still needs to get power in order for it to do its job, but will not draw more than a few milliamps.
Since no-one has talked about a single compressor situation...can you provide some pics, model numbers etcetera?
Bill
RE: How I Connected Relays to A/Cs - Richard - 08-15-2017
David,
The only thing to add to what bill said is that the comp relay on the board now
Draws a fraction of an amp instead of 14 amps.
Also make sure that you wire comp 1 of unit 1 and
Comp 1 of unit 2 to opposite hot legs of the incoming power. That way the load stays as
Balanced as possible. Call if you need clarification 817 223 2056
RE: How I Connected Relays to A/Cs - Chester Stone - 08-15-2017
To be specific, yes, the fans receive their power through the board.
RE: How I Connected Relays to A/Cs - Land Yacht - 08-15-2017
Here are some pictures of my final install. I did not trust my skills, so I purchased the parts, and hired a friend who has a HVAC business. After looking at the diagrams from Chester and talking to both Richard and Bill at separate times, he got it, and did a professional install for not much money, and just in time, as one lead was already black but still worked.
RE: How I Connected Relays to A/Cs - bikestuff - 08-15-2017
Looks good Mike!
RE: How I Connected Relays to A/Cs - Richard - 08-15-2017
Nice touch using the water resistant pigtails!
RE: How I Connected Relays to A/Cs - Land Yacht - 08-15-2017
(08-15-2017, 07:38 PM)Richard Wrote: Nice touch using the water resistant pigtails!
My buddy (installer) had them from another job. They add an element of professionalism.
RE: How I Connected Relays to A/Cs - David and Teresa - 08-16-2017
(08-15-2017, 06:27 AM)Richard Wrote: David,
The only thing to add to what bill said is that the comp relay on the board now
Draws a fraction of an amp instead of 14 amps.
Also make sure that you wire comp 1 of unit 1 and
Comp 1 of unit 2 to opposite hot legs of the incoming power. That way the load stays as
Balanced as possible. Call if you need clarification 817 223 2056
It will be a few days before I have time to do this, but I will call. Thanks.
RE: How I Connected Relays to A/Cs - David and Teresa - 08-25-2017
I finally have a moment to do this to my front, single AC unit. Just to make sure, I should tie all the neutrals together? Is there something that professionals use to do this?