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Relay not work

Circuit wire burn

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  • Danny Clark
    Danny Clark May 11, 2010

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When i wire transformer it burn


something is either shorted or you are wiring the wrong wire on primary. they have different wire colors for different voltages. also install a 3 amp fuse in transformer wire & it wont burn up.

Feb 12, 2014 | Ruud Rheem Enclosed Fan Relay 42-25104-06...

Tip

Relay Wiring tips and tricks Simple circut. What to look/lookout for


Typically if you want a circuit completed when energized you use C (Common) and NO (normally open). This means that the contact will close when energized and thus complete your circuit. However in some cases a relay is used to stop current from flowing and when energized the contacts used are C and NC (Normally Closed) meaning that the circuit is closed when the relay is off and open when energized.

Other things to consider if "rigging a new circuit".

More precisely, what exactly are you going to accomplish:
Turn On a motor, or light
Turn Off a motor, or light
or complete a timing sequence,
Turn On A heater
Lock out a motor
Isolate a motor

A simple relay works but you had better make sure 2 things 1. your relay is not TOO HEAVY on the VA of the coil (this would cause a control transformer to burn out) is the correct voltage coil, AND 2. BE SURE YOU KNOW WHAT HP OR AMP DRAW your relay will be expected to hold while energized (or de-energized which ever the case may be). This latter is the contact rating. Too small and it will burn out. Too heavy, well I see not much trouble with too heavy a contact rating except it usually has heaver VA draw form the coil the bigger the contacts are.

DOes this help you?

on May 16, 2009 | Carrier 38BRC036 Air Conditioner

1 Answer

My Dometic roof top ac doesn't cool. Fan runs fine, no COOL air. With thermostat in off position. Checking the voltages I found 118v at the breaker. At the run relay, 118v going in and a coupl


Please reply with Model number of bottom of AC unit ( upper) . Can be seen from inside usually. Thermostat model, plus if controls are at the ceiling assy or at thermostat on wall.

Jan 17, 2013 | Dometic Rooftop RV Air Conditioner

1 Answer

I need to know fuses box


Copy following link to see basic circuit breaker box.
http://waterheatertimer.org/See-inside-main-breaker-box.html

It appears you are connecting home automation to to breaker box.
Remove one wire from each circuit breaker. Connect this wire to relay. Then run new wire from relay to circuit breaker.
When the relay turns ON, then that will complete circuit to each circuit.
This will work for 240 volt or 120 volt or 277 volt single-phase split phase..

Match wire size and circuit breaker
http://waterheatertimer.org/Color-codewire.html

Nov 22, 2012 | Air Conditioners

1 Answer

I have a Payne heater model 394jaw036045 and just stop working this is the first time this ever happpen, I removed the sheetmetal cover from the board and notice one of the plastic cube attach to the board...


Not sure what relay it may be, but if the relays are not replacable, pulls off the board, you will need a new board. After replacing relay or board, I would recommend that you amp the circuits to ensure that a component is not defective or going bad which may have caused the relay to burn.

Dec 07, 2011 | Air Conditioners

1 Answer

Circuit board on AC unit at home was replaced, turned on unit and new circuit board burned also burned spots at the same locations as older board? What could be the problems?


You have something in that circuit that's pulling high amps or shorted. You need to determine what is in that circuit fan, compressor, contactor, wiring, etc and fix it first.
Until you fix that you will keep burning up boards.

Oct 07, 2009 | Air Conditioners

2 Answers

Dometic RV Rooftop A/C stopped working. Burnt electrical smell


if you can find a decent a/c mn in the area he might be able to patch you up until you get to an authorized dealer?

Jun 07, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Burn out circuit board


hi! there! replace the burn out circiut board,what ever you pull out the same thing you put back just be sure that has the same model and specification,calibrate and test overload protection,defective overload protection replaced to prevent any burn out,short circuited mostly came to burn those thing that's why imposing preventive maintenace schedule for this kind of large ac central unit is very much significant.mostly timer delay circuit malfunction on large scale unit supplying by three phase a/c source on central control panel board.when ever replacement occured try to put mark or list color coding of specific terminals to connect and isolate short circuit make possible to detect at once before installing the new one and make make record on this for future reference we have several cases like that after buying a new one and replaced still burn again,the common cases is that they did not find the cause of short circuit connection they just relay on circuit board burn out,so it better to make assured that every thing is fine before installing the new one.specially on supply source of circuit.,relay on diagram and manuals take and check all data source as reference this will be a great help.take all necessary precaution this should be done by qualified technical ac support,have a nice day and regards

Mar 31, 2009 | Air Conditioners

1 Answer

I am troubleshooting a goodman package unit


You have a short to ground somewhere in the low voltage wiring.

You will need an OHM meter to test each 24V component for continuity to ground.

Test each part with the wires disconnected. If all the parts are OK, then it is a wire touching somewhere. (unlikely but pssible)

I would start testing at the 24V side of the transformer. Often times it is the boad that has shorted internally.

Sometimes you can look at the back of the board and see burn marks where one circuit has shorted to another.

Contactor and relay coils are also known foir this problem. (24 V coils power the relay, sending high voltage to its corresponding component.)

Jan 14, 2009 | Air Conditioners

1 Answer

Went to a family dollar with a roof top unit and at the time could only check right above the drop ceiling, where there was a return and supply flex and a piece of square duct going through the roof and a...


sounds like a smoke detector to me. usually they just break the red or the green through a relay, if it smells smoke. could be dust burning off the heat strips first use, or you could get on the roof and find burned wires or motor. lots of old wires burning up with heat strips kicking in this time of year. i usually have em turn off alarm so fire dept wont come and turn to max heat and burn off the strips , measure amps, check wires, and all relays etc. you may have to bypass smoke detector till done. then return to correct "as found" wiring and reset alarms. hopefully no call backs. good luck.

Nov 21, 2008 | Air Conditioners

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