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I HAVE A 24VOLT TRANSFORMER WERE DOES THE RED WIRE AND THE YELLOW WIRE GO CONNECTED TO THE HEATER BOARD ST9101A 1014 THE MODEL RGDG-075AMGR

I AM LOST IT KEEPS BLOWING MY FUSES

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Generally the 24VAC terminals are marked on the furnace board. If it is blowing fuses, check for a short circuit in the thermostat wiring. I have found that the short is usually at the condenser unit where the insulation deteriorated. Many times caused by a dog or cat chewing on the wire. To test, remove the thermostat connections at the control board and power up to see if fuse blows. If it doesn't, you found your problem. Good luck.

Posted on May 13, 2014

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Posted on Jan 02, 2017

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ranger25
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SOURCE: Wiring a thermostat.

The green one is for the evaporator fan motor relay. The white one is for the heat sequencer. The one coming out of the transformer is usually red BUT it will be the power so attach it to the terminal labeled R on the thermostat. If there is a RH and a RC, put a jumper in between them. See if the purple and brown ones go to the fan motor, if so, then just cap them off with wire nuts, and that should have your heat working. Check to make sure the green and white wires go to their designated areas (the heat sequencer looks like a stacked set of thermal overload switches and the relay looks like, well, a relay) and neither ground out before flipping on power or you will pop your transformer.

Posted on Jan 28, 2008

david04928
  • 102 Answers

SOURCE: Danby dpac 7599 PC board fuse keeps blowing

Sounds like the Start capacitor might be shot.  I think  you need a professional to service it.  

Posted on Mar 11, 2009

  • 252 Answers

SOURCE: Rheem RGPH 07EAMGR keeps blowing 2A 250V fuse from

99% of the time proves to be a short- in the thermostat, furnace, condenser, or the 24V wires between them. Time to get out an ohm meter and check continuity between the wires and between each wire and ground - detective work - can be fun!?
Much less likely: condenser contactor, furnace control board, other condenser controls any of which could be drawing too much current. I bet on a short curcuit but if not I'd try changing the contactor first I think.

Posted on May 06, 2009

  • 4 Answers

SOURCE: schematic diagram Rudd silouette II a/c gas furnace needed

There should be a small set of screw lugs on the electronic board in the furnace. Look for a red wire that comes out of the transformer and follow it to find where the 24V connections are.

Posted on Sep 26, 2009

  • 25 Answers

SOURCE: I keep blowing the control transformer when I turn

First thing I would recommend is to go to the closest auto parts store and get an inline car fuse folder and some 5 amp fuses. Connect this to wire that comes off the transformer and goes to R. That way you will only blow fuses instead of transformers.
I will assume this system isn't a heat pump since it runs fine in heat mode. If it is, please let me know. Also, I will assume there is no circuit board outside, but let me know if there's one.

Go out to the condenser and remove the Y wire from the contactor, then try the system in cool mode. If the fuse blows, you have a short in the low voltage wire between the air handler and condenser and will need to find it, cut it out, then re-splice. If the fuse doesn't blow, you will likely need a new contactor.

Posted on Mar 23, 2010

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1 Answer

Inside blower wont run


Sounds like you need a new board. Their are people out there that will replace the fan relay on these boards, but I have always just replaced the whole board with a new one. These boards can range from around $50 to $300 depending on which board it is. The way we always double check these boards are exactly the same way you have done it, only we use the 120v from the units transformer and bypass the board, if your fan comes on, your board is not sending the power through to the terminals. It would be different if nothing else on your system was working too. I hope this helps and good luck!

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The time works, but SOLENOID does not come on - the SOLENOID was working prior, but the timer was not working, was able to put on manual, but that does not happen now - i have the two yellow wires from the...


http://www.intermatic.com/products/timers/mechanical%20time%20switches/sprinkler%20irrigation%20timers.aspx

http://waterheatertimer.org/pdf/Intermatic-t8845pv.pdf

http://waterheatertimer.org/Intermatic-trippers-and-parts.html#sprinkler

T8845PV has 2 yellow wires for 24Volt output that powers solenoid.
1) Yes the yellow wires connect to two wires on solenoid.
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1 Answer

Wiring diagram for Thermoking V700MAX


Red or R is the "Hot leg" of the Transformers 24volt supply,
Common or C is the "Neutral leg" of the Transformers 24 volt supply;
and the side of power to which ALL the 24 volt control circuits
terminate to complete the circuit, example; Heat=W, Cool=Y, Fan=G.
Upon a call for heat a switch closes betwen the Red and White Thermostat terminals.
The stat sends the 24 volts to White or W for the heat circuit on W on the
furnaces LVTB low voltage terminal board.
Yellow or Y goes from Thermostat to furnace Y on LVTB, which is simply
a connecting point on its way to the AC units 24v contactor coil located outdoors.
It actually isnt even attached to the furnace many times as it serves no purpose there and simply
continues to the AC unit with the copper lineset that the AC unit feeds.
The remaing 24 volt Thermostat wire goes back to common on transformer to complete the Yellow
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Green or G exits the Thermostat and connects to G on LVTB for the fan relays 24volt coil
and returns to Common to complete the Green 24 volt control circuit.
O is for a Heat pump reversing valves 24 volt solenoid, and return to Common as all 24v circuits must to terminate or complete the circuit.
Some parasitic type Termostats need the 24v power to run, some are battery, some are both.

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1 Answer

How do I connect up the wiring for this please


Yellow/yellow wires are connected to 24volt power supply.powered only on a demand.Red/red is a isloated end switch to turn something on during a demand.Using the end switch can sometimes be optional.

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1 Answer

How do you wire a honeywell round mechanical thermostat


What are you trying to wire up?
Typical Thermostat Wiring for 4 or 5 wire Heat/Cool Thermostat (not heat pumps)
4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
With 2 transformers one for indoor unit
And one for outdoor unit
Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
Rh = Blue One side of (inside) 24 volt (inside transformer)
W = White Heat (inside transformer)
COOLING ONLY Thermostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
HEATING ONLY
R or Rh One Side of 24 volt Transformer
W = White Heat

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1 Answer

I have a coleman Evcon model AH16-0 . I am


Typical Thermostat Wiring for 4 or 5 wire Heat/Cool Thermostat (not heat pumps)
4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
With 2 transformers one for indoor unit
And one for outdoor unit
Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
Rh = Blue One side of (inside) 24 volt (inside transformer)
W = White Heat (inside transformer)
COOLING ONLY Thermostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
HEATING ONLY
R or Rh One Side of 24 volt Transformer
W = White Heat

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1 Answer

Ac unit starts up intermitently and runs for a few minutes then shuts down.Light on circuit board is steady red.Thermostat goes blank.


Sounds like you have a loose/broken 24volt wire. I would look at the wires comming off the transformer, the board, and the thermostat connections first.

Somewhere you are losing 24 volts. Obviosly the transformer is working, so you are just losing control voltage somewhere.

Check all connections at wirenuts, stackons, etc.

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1 Answer

Schematic diagram Rudd silouette II a/c gas furnace needed


There should be a small set of screw lugs on the electronic board in the furnace. Look for a red wire that comes out of the transformer and follow it to find where the 24V connections are.

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