![]() If you get a negative voltage reading, you know you have the test leads swapped. ![]() The only way to be sure is to use a voltmeter and measure the voltage across the two wires. *I say " usually" since I've seen a wall wart with the wires were reversed, although every other wall wart I've used does it the way I've described above. text providing wire information, a stripe, etc.) is the positive end, and the unmarked wire is the negative end. on this side, where you see a little bit more wires, that's gonna be our primary. This kind of convention is used on speaker cables as well, where the wire that is marked in some manner (e.g. It doesn't matter if it is striped or dashed, the presence of any kind of marker is the indicator of the wire being the "positive" end of things, as opposed to the unmarked "negative" wire. Usually* the wire with the white stripe or the dashed lines carries the "positive" (+) end, while the other, unmarked wire carries the "negative" (-) end. The solid/dashed lines on wires like the ones pictured in your question are used to indicate polarity e.g. The two brown ones connect to the AC output in any order. I will need to ohms test new transformer disconnected too. I will do some ohms tests on several wires also. Ĭan a cut 24 volt wire to stat, maybe by rodent or weedeater cause the same issue ? Ill test it an see if reset got tripped an check wiring on the glass fuse.Im gonna ohms test old transformer off it too. those capacitors were OLD.again nothing changed as far as function. a primary of 120 or 240 or 480 volts and the secondary of 12/24, 16/32. I changed out inexpensive capacitors an same contactor last week ,after it started. Single Phase Transformer Wiring DiagramWe can see in the phasor diagram that the. Can you help me figure out what goes where On the high side I have 2 red, 2 blk. I want to use each 12v on the low side seperately It came with zero wiring diagrams. The contactor replaced 8 mo ago due to old age an worn contacts. 1 I have a transformer that I got from MPJA: It is a 120v to 24v center tap. I use a permanent gas heat i have in winter a lot too. Good cold air if contactor is engaged manually. I put in a goodman last year at my other place. Standard control transformer, 40 VA, 240 VAC input 24 VAC output. Im gonna put another unit in myself later but want to get this 24 volt issue fixed. Standard Control Transformers > 240 V AC Primary Control Transformers. A bit more in the summer yea but not bad. Yep back then they didnt have a fancy reset switch on transformers. It did for my son when an old unit was replaced. A new SEER 16 unit may knock off $150-$200 a month off the electric bill in the summer months. After this weekend heat we’re going to have it may convince you that it is time to retire the unit. It must be a R22 refrigerant that will no longer be available unless there is old inventory around and prices are through the roof. The contactor is new so had there been other problems? This beast being over thirty years old is or less than SEER 10 and it must be costing a fortune to run it. Something other than infinity or zero should be read. If still no output, with power off and the blue/yellow disconnected, read the ohms across them. ![]() No connection it could read up to 29v, under load as low as 18v. ![]() How old is the compressor? They don’t last 30 years.ĭid you measure the 24v connected or disconnected? Should read it both ways. ![]() Are you sure it only thirty years old? I think it is older. This type of fuse on the low voltage side. I print the schematic plus highlight the circuit I’m diagnosing to make sure I am staying on the particular path. Possibly you can eliminate this fuse since the transformer has a built in breaker. I will make a note/sticker on the furnace, as you suggested. Now, that you confirmed the transformer uses the same R on the thermostat, all is clear. From the picture there is rust stains inside of it and it reads “dual element”. I did see that video - it describes 2 wire system, that doesn't use the R on the thermostat. Next, a jumper is connected between the H1 lead and the low-voltage lead adjacent to it, and a voltmeter is connected between H2 and the other low-voltage lead. With this in mind, the H1 and H2 leads are labeled. Since the new transformer has a breaker, check the glass fuse and holder with an ohm meter. Dual voltage transformer with its secondary windings connected in parallel. This breaker/reset button looks like it is on the 24v output side because of the amp rating and near the blue yellow output leads. For the input side only two wires are ever used. ![]()
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