Question about Dometic Rooftop RV Air Conditioner
I HAVE A 1994 SUNNYBROOK TRAVEL TRAILER WITH A DOMETIC THERMOSTAT AND I WANT TO MAKE SURE THE WIRING AT THE WALL IS CORRECT. THE BOARD HAS THE FOLLOWING LOOSE WIRES= B1=BLACK B2= RED=B3=BLUE B4=BLUE.I HAVE OUT OF THE WALL ONE THICK WHITE WIRE.ONE THICK RED WIREONE THIN RED WIREONE THIN WHITE WIRE.THANK YOU FOR YOUR HELP.ROBERT
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Posted on Jan 02, 2017
You almost have it Look closer at the run capacitor. It has Herm, this is for the compressor, Com or C and F or Fan.
1 of your power wires is the fan speed so connect them accordingly usually black is hi, blue med, & red is low. You are "feeding" voltage to the selector switch on 1 side and coming out to the fan motor speeds.
Next you have a "Common" wire on your fan motor (this means its Common to all the other connections inside the fan motor to me. It is usually white. Connect this to the other line of power usually the Com on the capacitor unless it connects to a strip on the selector switch. But 1 of these 2 places will be the other side of your Power when plugged in. Lastly the brown it is usually the fan capicator only wire and it will connect to the fan "F" terminal on the capicator this terminal will not have any other wires connected to it.
This should make you a happy camper. Please rate me accordingly and good luck.
Posted on Mar 08, 2009
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
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,
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.
Posted on Jun 29, 2009
If you look at control box at roof unit, they usually use a separate set of wires for furnace. See what colors they are attached to at harness to thermostat. Some just follow other harness, and come out at thermostat. (bypass control box) Once you've determined which 2 they are, join them together & see if furnace starts, as it should. If it does, thermostat is faulty. If not, pull outside cover off & check voltages at furnace. I'm guessing by furnace model that your unit is approx 30 ft , but if it's a park model, you may have 24 volt system on furnace or 12 volt. Another way of confirming is to go to back of furnace where air intake grille is inside your unit, and locate 2 blue wires going to furnace & remove whatever wires are attached to them & connect them together. Furnace should start up.
Posted on Jul 08, 2009
Testimonial: "thanks for the link. info solved my problem."
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