Question about Dometic Rooftop RV Air Conditioner
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
I looked everywhere for clarification on this mod
All the tips have RW + RC jumpered with a "BLACK OR GREEN" wire ground going to them....that didn't make any sense electronically to me so I put together a schematic diagram and just installed the mod last night...it works perfectly in cool, heat, fan speeds, everything.
RC and RW are unjumpered in mine since each could theoretically have a different power source, otherwise you could be working on one alone and the darn thing energize on you from the other units power source.
Posted on Aug 18, 2012
This is what you need to do verify first the function of each wires.
using a jumper connect the hot lead to the other side and connect the other one to the other wires,
for example put a jumper to the red hot wire and green this should energized the fan or the blower then tag the green wire for fan. Until you verify the completely the functions of each wires then use the WR manual to cross that will be so simple. Note make sure that you don't put a jumper between red to red or hot wire to hot wire. The WR 300 thermostat is for single stage and doesn't fan a high/low fan switch.
I hope this will help you a lot: please contact me through email if you encounter any problem email@example.com
Posted on Jul 07, 2010
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Posted on Jan 02, 2017
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