Question about Dometic 57915531 Air Conditioner

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Circuit breaker kickes off at different times.

I think the Motor Starter (current relay) might have pitted contacts causing
high current & causing the 20A dreaker to kick off. The praesures are
normal & so are the compressure amps.The blower motor turns easy &
doesent seam to bind up. I cant find the WSX-7 Motor Starter anywhere
to see if that is the proublem. Can you help me ? I really think that is
the proublem. What do you think ?

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I assume that you are a technician so you are aware of the electrical dangers of these tests. If you are not a tech, please call one.

It may be the contactor relay but first try this too.

At this point I would perform an over all amp reading between the unit and the breaker box somewhere. Make sure you take a reading at the start up, as this is when the system will pull the most amps. If the over all amps DO NOT exceed the breaker rating and the breaker still trips, I would suggest that the breaker is weak and should be replaced.

If during this test you find that the amps DO exceed the breaker ratings then I would try to look at the start run capacitor.

Posted on Jun 17, 2008

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2 Answers

Why does the breaker keep tripping on this 2.0hp exhaust fan motor


Christopher, motors starter/capacitor could be faulty, wire circuit/breaker could be insufficient. motor could be faulty or wired incorrectly. Have motor checked out and ensure you are wiring correctly.
Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
LEESON Electric Motor Trouble Shooting Chart
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http://www.garagejournal.com/forum/showthread.php?t=256105

Jun 03, 2016 | Air Conditioners

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

Why does my Ruud HVAC ventilation fan run constantly?


The two relays on the control board are for the heat (low speed) and for the cool (high speed) cycles. You should be able to determine which speed is sticking in by removing one at a time the heat speed wire and the cool speed wire. At any rate the circuit board will need to be replaced to correctly resolve the issue. If you have a 'clamp on ammeter' you could determine which wire to the motor (in addition to common) is remaining in the circuit. My concern is if the cool speed is the relay that is stuck on the motor may overheat when the heat relay closes. The circuit board reverses the position of the contacts in the two relays when in one mode or the other and stuck relay contact will not allow the opposite speed to de-energize. When you said the motor sounded like it was running 'correctly' when the cool speed was removed leads me to believe you have two winding energized due to the stuck relay and motor overheating and eventual failure is bound to occur. There is an internal winding thermostat that shuts power off when the motor overheats, but only so many times then it will remain open necessitating motor replacement.

You can definately change around the motor speeds, but you cannot use the cool RELAY for heat and vice versa as they are controlled by the board logic and inputs.

Of course there are always NEW products coming on the market that operate differently than the old systems.

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1 Answer

I have a older York Split unit system. My compressor and fan will not always start..and today it just buzzes for a moment then stops. Does this sound like a sensor? It flashes red twice on the outdoor...


Sounds like the contactor may be pitted or could even have bugs or ants in it. The contactor is the automatic switch located in the outdoor unit. The power coming in to the unit will be tied in to this switch. This switch is operated by the thermostat and has contacts that make the circuit when the thermostat come on. Sometimes these contact will pit and be worn out causing the electricity not to flow to the air cond. Other times ants like to crawl up in to these contacts and cause the electricity not to flow to the unit. A contactor is not expensive, but if you take yours off to get a new one, take a picture of it before you unwire it and even make a schematic so you will know where to put the wires back. Hope this helps.

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1 Answer

When I turn the unit on for the first time it does just fine.But, if I turn it off and then back on it kicks the circuit breaker. I replaced the breaker, but it still does the same thing. Now, if I run the...


Try spinning the fan by hand and see if it rotates freely. If it doesn't it can cause it to draw too much current. You can also get a clamp on ammeter to check the current draw. When you have the compressor running and turn it off, then right back on, there is head pressure built up on the compressor discharge. It is hard for the compressor to start running when it already has that head pressure to pump against and may cause the circuit breaker to trip.

Sep 24, 2010 | Air Conditioners

1 Answer

Ac unit wont start


Sounds like a classic case of a burnt/pitted compressor contactor. The contacts can get pitted and sometimes burnt. This can cause them to stick and the unit will not shut off unless you shut off the circuit breaker. When you shut off the circuit breaker, the contacts would have cooled down which could have led to the problem you are now experiencing......will not come on. Open up the electrical box. Look near the bottom for a brown or black part with the wires from your circuit breaker wired directly to it. This is your contactor. In the center is the piece that moves up and down to allow the electricity to go to your compressor and fan motor when there is a call for cooling. Check to see if it looks burnt or otherwise damaged.

Apr 04, 2010 | Carrier 38CKC048 Air Conditioner

1 Answer

Fan works but condenser does not kick on


You air handler and condensor run off of two seperate circuit breakers. They share the same control voltage source. With the air handler responding to the thermostat setting, we know you have control voltage. You either have a problem with the line voltage at your condensor or something is happening in the control. Check your circuit breakers and/or fuses to your outdoor unit. Also, look for a red button near the area where the refrigeration pipes enter your condensing unit. Push the red button. If it starts to run, your unit went out on High Head Pressure. A dirty air filter this time of year can cause head pressure problems in the heat cycle (assuming this is a heat pump). Also check for cleanliness of the condensor coil and ensure proper operation of the outdoor fan motor.
There are a couple of components inside the condensor that could prevent it from running. One is the contactor. If the contacts are pitted or if a bug crawled in between them, it will prevent the unit from running. Another component is the Dual Run Capacitor. If this fails, it could prevent operation of your outdoor fan and compressor. Don't forget to check all your wires and connections. Always shut off all power prior to reaching into the electrical compartment.
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1 Answer

Wiring a relay contact


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 just as ac fixer said but you had better make sure 2 things 1 your relay is not TOO HEAVY on the VA of the coil (and like he said is the correct voltage) 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).

DOes this help you?
If so please rate me as high as you can. If not I will need to know more than what you have asked. Please be as speciffic as you can with clarity that you understand and post back. Thanks for using fixya.

May 15, 2009 | Coleman Air Conditioners

3 Answers

My ac circuit breaker keep tripping


If your outside condenser has a locked rotor or short circuit, than the unit WILL trip the breaker - as it should. On the other hand if a breaker is tripped a few times it will have less of a capacity that the rating, (this is designed in it). You will need to determine if the unit is locked (and broken) or the breaker has become too sensitive.

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