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Old 07-01-2012, 07:39 PM   #1
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Ac trouble

Went camping this weekend thing went well until ac froze up, turn it off for 30 minutes and it started cooling. Any advice on this would be appreciated thx
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Old 07-01-2012, 08:42 PM   #2
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Low or restricted air flow due to using low fan speed, dirty filter, dirt evaporator coil, bypassing air internally are the causes 90% of the time. On the rear occasion, it may be low refrigerant.

So check that everything is clean and run the fan on high. Also check to see that the freeze sensor is properly attached to the coil.

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Old 07-01-2012, 09:07 PM   #3
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Is the filter clean ? check for a restriction in air flow (wasps nests leaves etc.)and as stated the fan could be running to slow. Refrigerant is the last thing I would expect. One other thing, if it is really hot outside, start the AC on low until it starts to cool the interior down, sometimes starting on high will cause it to frost over.
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Old 07-02-2012, 07:22 AM   #4
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Never seen one frost over on high at start up. On hot start up, the suction pressure to the compressor is high (high evaporator temperature).

Ken
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Old 07-02-2012, 06:28 PM   #5
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Were you connected to 30 amp or did you have to reduce to 20 amp? If you do not have the correct voltage to the unit it will frost over. Try starting at a low temp and adjust evey 15 minutes if you have 30amp. May sound long time but beats no air.
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Old 07-02-2012, 09:24 PM   #6
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trackman, could you explain how the 20 or 30 amp or voltage has an effect on frosting? My 40 plus years in refrigeration can not come up with an explanation for this behavior?
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Old 07-03-2012, 07:20 AM   #7
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When trying to operate on lower amps the fan will not spin at needed rpm causing frosting.
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Old 07-05-2012, 09:11 AM   #8
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Also check your thermostat settings. A 20 degree (if I recall correctly) differential from ambient temperature to what you would like your inside temperature to be would be the maximum to expect. If your thermostat is lower than that, then you can expect it to freeze up.
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