Question about Ruud UBHC Air Conditioner

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Condenser outside Aight,,, so i finally got power to it outstide,, now, to get it to work i had to bypass some wires,,,, from thermostat to furnace and then to outside we wind up with red and white wires.... both hace power,,, now,,, the white connects to and follows a blue wire.... blue wire goes down and inside this white tube lookin thing... this thing is attatched to copper pipe,,, another or possibly same wire comes out,,, thats where the power stops and fail to turn the motor on,,, what is that thing and is it replaceable,,,,???

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You could br=e low on r-22. sounds like the thing is a pressure switch

Posted on Jun 11, 2008

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How do i bypass the furnace and still use the duotherm 57915.531


Do you have the digital thermostat? You can tell the thermostat you have no furnace. You should be able to disconnect power at the furnace, but the 12v power for the circuit board is provided by the furnace circuit on some systems so make sure you disconnect the wire going to the furnace and leave the wire feeding the circuit board.

Oct 06, 2014 | Coleman Dometic Duotherm Rv Air...

1 Answer

Power up unit and thermostat, circuit board and gas valve smokes. checked transformer and its output is 24vac. this happened after a thunderstorm. blower works manually from furnace but not @ thermostat....


You have a short circuit, which is obviously dangerous. Your blower motor is controlled via a 24VAC control circuit, but is 120VAC. The circuit board and gas valve are probably history, but it needs to be troubleshot to determine the scope of the damage.If you remove T stat you will see several colored wires. The red and green wire when touched together should cause your fan blower to run. If that works when you bypass t stat the t stat is gone. The red to white will open your gas valve on your heater. The red to the yellow or blue will start your AC compressor or condenser fan motor. Be careful with the yellow and blue wires as one is actually a neutral and one goes to the AC contractor on your condenser unit contractor. Hope this helps!

Aug 02, 2011 | Air Conditioners

1 Answer

From the Isolator panel, how do I connect the condenser, and the blower?


MOST UNITS NOT HEAT PUMPS  WIRE UP WITH 2 WIRES TO CONDENSER RED WIRE AND WHITE . WHITE GOES TO COMMON C ON FURNACE AND RED TO Y TERMINAL OF FURNACE Y ALSO GOES TO Y ON TSTAT. BOTH YELLOW WIRES MUST MEET AT Y OF FURNACE.  WHITE FROM STAT TO W   GREEN FROM TSTAT TO G AT FURNACE IF YOU HAVE C ON TSTAT HOOK UP BROWN WIRE OR BLUE FROM COMMON TERMINAL WHERE YOU HOOKED UP CONDENSER WHITE WIRE AT FURNACE TO TSTAT , MOST THERMOSTATS DONT NEED C RUN FROM FURNACE. THE TWO WIRES GOING TO CONDENSER IS -  AND + TO ACTAVATE CONTACTOR IN OUTSIDE UNIT

Apr 19, 2010 | Ruud Central System Air Conditioner

1 Answer

Relay not engaging


This solution is based on a non-heat pump split system (furnace inside and condensing unit outside). The relay takes 24vac to energize and pull in closing the high voltage circuit to the compressor and condenser fan. If 24vac is present at the coil (two side terminals with smaller wire) and the relay does not pull in you need a new one. If no 24v is present then the outside unit is not getting the signal from the furnace and thermostat. If you pop off the furnace covers and access the control board your wires that go outside land on terminals C and Y. Y should have two wires, one from the thermostat and and the second goes to the outside unit. Test for 24v between C and Y. You must bypass the safety switch on the door prior to testing because that switch will cut off the power to the furnace. If nothing then you have a thermostat problem. If voltage is present you have a wiring issue between the furnace and outside unit.

Jul 11, 2009 | Air Conditioners

2 Answers

I have a DuoTherm BriskAIr 13.5K BTU. The Dometic thermostat also controls my HydroFlame 8531-IV furnace. This morning, the furnace would not come on. I checked the wiring and there is no voltage at the...


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.

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1 Answer

Carrier air conditioner cycles on and off


The compressor/condenser is being called all the time. The reason it goes off is because the evaporator (indoors) freezes up when the fan is told to turn off by the thermostat. This further cooling lowers the low side pressure below the low limit switch point turning off the compressor unit.
Solution: Make sure the thermostat is wired correctly. Green wire is usually the compressor wire but maybe not.

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2 Answers

Problems with low voltage control wiring turning on cond. unit


Only 2 wires going outside.
Yellow from the thermostat and the common wire from the lv side of the transformer.

Apr 28, 2009 | Air Conditioners

1 Answer

Outside a/c unit hasnt powered on yet and I want to make sure my RH and RC wires are correct.


Connect the red to RH

Go down to the furnace and look at the circuit board and note what color's go where. Most units only use 4 wires.

Should be
RED to RH
YELLOW to Y
WHITE to W
GREEN to G

Then from there two wires go to condenser outside. And they connect to Y and C on the board. Most of the time Red and White from outside. Don't get confused with Red coming from thermostat. Let me know Ken

Apr 26, 2009 | Air Conditioners

1 Answer

Central Airconditioner Heat Pump Weather King Brand outside unit continues to run even when thermostat is disconnected from terminal block base. Have to flip ckt bkr off to turn unit off. Recently it...


It sounds like you might have a short in the wiring that goes from the furnace (inside part) to the condenser (outside part). Follow these lines by hand and check to see the wire isn't damaged and shorting out.

Sep 18, 2008 | Air Conditioners

1 Answer

Air handler


This should be doable: First get pen and paper-start at the furnace, theres a group of 5-8 wires leaving the furnace anfd going to the thermostat and a group of 2-3 going to the condenser outside that all need to be identified and the location in the furnace recorded if your furnace has a control board simply right the letter and the corresponding wire color:and whether it belongs to the condenser grp or the T-stat grp.

Furnace
R-red-to t-stat
C-yellow to cond
Y-red to cond and yellow to t-stat
G- green-to t-stat
W- white- to t-stat

If you dont have a circuit board youll be doing the same thing but using the components rather than letters;

Transformer 24v- red to t-stat
transformer 24v com -yellow to cond
Red from cond connected to yellow from t-stat
fan relay - green to t-stat
gas valve - white to t-stat

K then go to you t-stat and simply connect the corasponding component or leter to the thermostat gterminal

Cond Furnace Thermostat

yellow com- blue -C or B
gas valve or w-white -W
fan relay or g -green -G
trans 24v or R -red - R
red connection to cond or Y on board -Y
Hope this helps.

Jun 12, 2008 | Quasar HQ2052UH Air Conditioner

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