Question about Dometic Rooftop RV Air Conditioner

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I purchase a 1997 Salem camper trailer and just replaced the Duo therm 13,000 Unit BTU. Everything was good until it was time to connect the wires from the thermostat unit to the analog thermostat on the wall. The existing cables do not match up at all in color or on numbers, any help? Thanks

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My ac works from about 8am til 10pm...after that the breaker trips and I can reset it but it will not stay on for more than 5 or 10 minutes...it doesn't matter if it's off until 3pm and I turn it on it still only works until about 10pm...if it is raining outside then it will trip several times during the day...at night we turn everything off...nothing is running except the ac and a fan...the fan runs all day also...

Posted on Aug 07, 2010

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Pay attention to wires from control box itself at the ceiling assy. Sometimes they will use a different color from control box, to thermostat. For example: Green coming out of control box, is attached to a blue running to thermostat, so you would attach that blue, to "G" (fan) on thermostat. Match thermostat colors to what is at the control box originally, not what color they used to run it to thermostat from there. Most try to match them, but others don't. What model Ac unit, and what model of thermostat do you have?

Posted on Aug 02, 2010

  • Mike Butler
    Mike Butler Aug 08, 2010

    Is "mommysuewho" reply a question or an answer? Sorry, I'm just not sure whether help needed or not.

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Have a 2006 cougar travel trailer with a 13,500 btu dometic duo therm (dometic part # 59516.531) I am currently living in the trailer and using ac all the time..About two months after i bought it ( ju


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Sincerely,Shastalaker7

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3 Answers

A duo therm thermostat (p/n 3105058) was removed because it would not operate the air conditioner/heater in a firan fireside camper. it was knocked loose from the wall damaging it.the thermostat is for use...


a. Remove the cover of the thermostat.
b. Connect the RED wire from the air conditioner
to the “RC” terminal on the thermostat.
c. Connect the “YELLOW” wire from the air conditioner
to the “Y” terminal on the thermostat.
d. Connect the “BLUE” wire from the air conditioner
to the “H” terminal on the thermostat.
e. Connect the “ORANGE” wire from the air conditioner
to the “G” terminal on the thermostat.
f. Push the thermostat wires into hole in wall and
fill excess hole with insulation.
g. Mount thermostat base to the wall with screws
provided.
h. Check all thermostat wires on base to ensure
they are completely clear of the bimetal coil of
the thermostat. Adjust if necessary.
i. Replace thermostat cover.
If nothing operates on the air conditioner, remove the
return air grille assembly and verify the red, orange, yellow
and blue wires are properly connected (red-to-red,
orange-to-orange, etc.).
Next, disconnect the red wires and check for 12 volt
DC between the red wire from roof section and the orange
or blue wire from roof section. If no voltage received,
refer to Section F2. If voltage is received, the
problem lies with the thermostat or thermostat wires.
Next, disconnect all 4 wires (red, orange, yellow and
blue) from the thermostat. With the thermostat set on
COOL mode, FAN mode set on AUTO and HIGH, and
temperature selector set lower than the room temperature. Check for continuity between terminal RC (red wire)
and terminal G (orange wire); and RC (red wire) and
terminal H (blue wire). If continuity is achieved on each,
proceed with the next step.
Set fan switch to LOW. Continuity should NOT be present
between terminal RC and Terminal H, but present between
the other terminals (Y & G) and terminal RC.
If all of the previous checks are good, the thermostat is
good, do not replace it. If any one of the previous checks
are not correct, replace the thermostat.

Jun 15, 2009 | Dometic Rooftop RV Air Conditioner

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