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How do you wire a new thermostat. accidently chopped wires from my old Danfoss one while decorating. I now have a white wire, with 4 inside it hanging. Bought a Herstmann but wiring is confusing?

I accidently snipped the wire from my Danfoss thermostat and couldn't see where the wires were supposed to go, so I bought a new one. A Herstmann and I don't have a clue how to wire it.

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  • 56 Answers

What ever u do make sure to turn off furnace power supply as u may well burn your furnace circuit board if you havent already. btw there is a fuse you may have to replace on the circuit board. now as far as wiring, its quite easy, look on your new thermostat, it has all the same lettrers.
w= white, r+red, g+green,c= common, b=blue blk=black, or=orange
then turn on furnace power, if nothing comes on look on the circuit board to repplace fuse, usualy 3 amps

Posted on Oct 22, 2016

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Posted on Jan 02, 2017

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Anonymous

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SOURCE: Old thermostat wiring doesnt match up with new thermostat

Look at the instuction booklet (or on the T-stat board) for a switch for the reversing valve.

Some systems reversing valves are in cooling mode when energised, some are in cooling mode when NOT energised.
You are looking for the switch (Usually very tiny, or a different jumper setting) that will change the position of the reversing valve when calling for heat/AC.

This is not a switch like the typical "ON OFF AUTO, HEAT COOL EMG HT switches. It will be on the board itself or the back of the T-stat.

Posted on Dec 06, 2008

Anonymous

  • 71 Answers

SOURCE: Help - I am trying to install a honeywell RLV4300A

You will have to have schematics from the old wiring diagram. Then you will have to confirm its consistency with actual old wiring before you can be sure that the wires run to the proper places on the old heater and a/c system. This sounds like a gas furnace and is simpler than a heatpump. Once you know what distinguishes the wires with the same color, you should label them and then you may call them a different color if they were wired with wrong wire colors. You may be in luck if you go to the furnace control box an look at the terminals.. They are usually labeled with a R for Red and W for white and Bl for Blue and B or Black. If you have other colors on these then it sounds that it was wired with wire spare wire by someone who knew what they were doing but neglected to leave a path for someone else follow.
You may be able to use a continuity tester of circuit tester to id these wires that are in question...
ie, once indintified, you can match with the requirements of the new stat.

Posted on Jan 13, 2009

fern dogg

  • 24 Answers

SOURCE: Honeywell RTH 230B Thermostat Wiring

put the jumper back in RC and RH and that should do it.

Posted on Apr 15, 2009

ja5767

  • 82 Answers

SOURCE: Wiring new RTH2310 DIY Honeywell

is the j2 jumper on the backside of the display set for hg instead of he - g is gas/oil e is electric - if correct take thermostat wires off screws and turn power back on - see if burner fires up with no thermostat wires connected - old wires could be touching somewhere when put on new thermostat

Posted on Sep 21, 2009

Michel Laprise Sr

  • 339 Answers

SOURCE: I just bought a Honeywell

I just installed a Honeywell 5.2 Day RTH2310B Programmable thermostat and I had to deal with the same situation: 2 wires, one white one black. After reading the edvice in one of the blog, the solution that worked for me was: BLACK ON Rc terminal and WHITE on W terminal. My furnace is running fine now. Hope it helps.

Posted on Dec 11, 2010

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I have 4 wires green blue red and white my red is connected to the rh rc with jumper green connect to g blue to y1 and white is connected to w1 my new thermostat has no rc rh or a jumper


Paulette, if your new thermostat has no Rc and Rh thats fine. The Red wire should simply go to the R terminal. The Rc and Rh terminals on the old one was for the old 'two transformer' systems. The vast majority of systems now have no need for the Rc Rh terminal and jumper. The rest of your wires connect as on the old stat also.

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Why is Hotpoint RLA64T Fridge freezing up after new thermostat fitted?


Make sure that the temp probe from the thermostat is located exactly where the old one was. If it had a plastic sleeve on the old one, the new one will need that sleeve. You shouldn't need to calibrate the control if it is the one specified for this model. If it was a generic replacement then possibly it could need some adjustment.

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I am replacing a 10 year old Honeywell Thermostat with a mercury switch with a new programable digital Honeywell OS#RTH7500D1007 MD 0638. There a 4 wires coming out of the wall and are installed on the old...


You are on the right track, you can hook the same 4 wires to the new thermostat without the jumper you had on the old thermostat. The jumper wire that is on the new thermostat can stay with no problems. Just connect the wires to the same terminals on the new one and your good to go!

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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

Wire colours to numbers on thermostat


GOTO DANFOSS .COM AND THEY HAVE HOW TOS ON EVERYTHING WITH A CUSTOMER SERVICE CONTACT GOOD LUCK HOPE THIS HELPS.

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1 Answer

I have a Rheem Gas Furnace with an old analog thermostat (Wires conneected to terminals R and 4 for the thermostat). I went to install a Rheem digital and programmable thermostat and it indicated that it...


if you have 2 wire at thermostat Terminals at furnace that the thermostat wire attach to should be R & W if your new thermostat has R & W terminals is should work, an easy thing to remember is the red wire on R the white wire on W. If 4 wire at thermostat at furnace green on G, Blue on Y, red on R,and white on W same at thermostat If these do not match find a thermostat with these terminals

Dec 06, 2009 | Heating & Cooling

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I bought a Honeywell programmable thermostat RTH2310 to replace my 10 year old Honeywell thermostat. My old thermostat is a 4 wire system but also has a jumper from Y to 1. New system does not tell me what...


It depends on the type of thermostat you have.
Do you have a 4 wire or 5 wire T'stat?
The red jumper wire was for a 5 wire t'stat with 1 transformer, the red jumper actually should have been from R to 1.
So you need to trace the wires back to the furnace and make sure they go to the locations identified below.
if you have a 4 wire t'stat then you don't need that jumper, if you have a 5 wire t'stat then you do need that jumper but it should go from Rh to Rc.
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
t'stat?

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1 Answer

I need wiring manual for goodman mini split.


outside unit L1 and L2 are load (input 240vac)
then you have control voltage, usually yellow and blue (24vac) this connects to some 18/2 thermostat wire which goes inside as white and red.

note: this unit may only need 24v control which is 2 wires from the inside unit and also 3 wires 2 hot 1 ground for line voltage.

STANDARD WIRING
on the inside unit you have green, white, blue and red control wires.

on your thermostat you have white, red, yellow and green

you run the wire from the outside unit to the inside unit. then run a 18/4 wire to the thermostat if wired and join the following wires.

inside unit thermostat outside unit
green------------------------green
white-------------------------white
red----------------------------red
blue-------------------------------------------------------blue
yellow--------------------yellow

Oct 08, 2009 | Heating & Cooling

1 Answer

I bought new Honeywell non programmable,letters are different.


If you have a 5 wire thermostat then you have a two transformer system a cooling transformer and a heating transformer.
The cooling transformer wires to Rc - Y - G,
and the heating transformer wires to R - W the R terminal heating would be the #4 terminal from the old stat.

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1 Answer

Im changing an old honeywell thermostat with a new honeywell thermostat. the old on has wires 4 wires connected to 4 screws C,R,G,W but the new thermostat has a place where the wires go which are...


Yes, I believe that you will be fine. If the original wiring is correct then I have listed the basic wiring below. As always read the directions and make sure the wiring matches your system.

Red wire = Rh (24v power, should have an exsisting jumper to RC)
White wire = W (heat mode)
Yellow (or sometimes blue) wire = Y (A/C)
Green wire = G (Indoor Fan)

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