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Installing a stat to a furnance

Need step by step on installing a thermastat to a two stage heating and cooling unit. I have installed a five wire line, or do i need more lines.

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You need a 7 conductor minimum, 8 will suffice.

Depending on what type of thermostat you are using, hard wired or battery will make a difference, some model thermostats have a "C" on the terminal strip regardless of the power being supplied to the thermostat. If your Thermostat does NOT have a "C", and the furnace does not require a common, then disregard that terminal.
The Terminal strip on the thermostat and the terminal board on the furnace should be close to this, and let’s assume you have 2 stages of cooling as well. This is a general rule of thumb for the wiring and their correct place.

R - 24VAC
W - Heat
G- Fan
Y - Cooling
W1- Stage 2 Heat
Y1 - Stage 2 Cooling
C - Common

Posted on Dec 02, 2008

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1 Answer

I installed a goodman 5 ton heat cool unit and a 5 wire battery operated tstat, the unit is 2 stage will it work with this tstat cant get anything to work even jumping the tstat


See if there is 124 VAC across the common and the red wire. If not then the thermostat transformer inside the unit will have to be replaced or the fuse changed if it has one(not likely).All t/stats are not the same. If your T/stat doesn't have a provision for the 2nd stage or emergency heat then you have the wrong T/stat That will definitely blow the transformer that supplies 24 vac to the control relays

Nov 15, 2015 | Goodman Heating & Cooling

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Carrier OEM to Honeywell Programmable Tstat - NEED HELP


you likely have a "two stage" system, but not a two stage heat pump. the first stage is probably the heat pump itself, and the second stage is the auxilliary resistance heat that suppliments the heat pump at lower temps. if i knew the terminals that are available on the new stat, i could advise you on the proper wiring.

Jan 27, 2013 | Carrier Heating & Cooling

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I have a carrier 38YC(M) heat pump and trying to install a programmable t stat (honeywell RTH6350D). One of the setup steps asks what kind of pump it is: with out without backup or auxillary heating,...


"Two" of the most complicated items that "experienced" Air Conditioning ServicePeople deal with are (1) Control voltage for Heat Pumps and (2) Installing a Programable T-Stat.
My best advice to you would be to find an experienced ServicePerson to wire the T-stat for you. I can assure you that you will save time and possibly money by doing so.

Jun 12, 2011 | GE Heating & Cooling

1 Answer

I installed a new Honeywell Programable thermostat, When I turned on the AC it turned on the Heater... I followed the wiring but some of it is not making sense... G=Green, Y=Yellow, R=Red, C=Blue,...


Hi, the problem is you have bought the wrong thermostat for the unit if it is not a heat-pump. A heat pump will have W-1, W-2 for heat strips, and Y-2 is for 2nd stage cooling. G is Green for Fan, R is Red for Power, Y is Yellow for cooling, and W would be for Heat. This is all you need if you have gas heat, Orange is for a reversing valve for a heat-pump, and the blue is also for the reversing valve on a Rheem heat-pump. The stat you need will have these terminals, if you are sure its not a heat pump, which I am sure you would know. The stat you need has these terminals. RC and RH. It will have a Red jumper wire connecting the 2 terminals. This is where the Red wire connects, to either one, as they connect together. Connect G to Green, Y to Yellow, and W to white. Since you only have one control transformer, that's why the stat has RH for Red Heating, and RC for Red cooling tied together. Just hook the red coming in to either one. You need only, R, G, Y, and W, to run this unit. Look at your old stat and check the terminals. A heat-pump, uses many more conductors to operate it. O or orange for the reversing valve, blue also depending on the unit. C for common, W1 for stage one heating, W2 for stage 2 heating, Y1 for stage one cooling and Y2 for stage 2 cooling. This stat is used for a commercial unit with multible stages of heat and cooling. If you have a common wire and no batteries on the old stat, go to the indoor unit, remove the panel, and see if you have a common wire hooked up, such as the brown, black, or maybe blue. If so, you will need to hook it up at the stat if it has a C terminal. If it has batteries, just take all of the extra wires and shove them in the wall. You won't need them. Just the R, G, Y, and W, and you will be back on line. Very easy.
Please rate me. Take it back and have them sell you the right stat. Please keep me posted and I will be here if you need my help. Thank you for using Fixya.
Shastalaker7
A/C, and Heating Contractor

Nov 23, 2010 | Goodman Heating & Cooling

1 Answer

I am trying to install the new tx900ts in my house and i do not understand the wiring on it i have a old trane thermastat that has different wiring codes


PLEASE GIVE ME A RATING AND VOTE YOU NEED TO FIGURE YOUR WIRES WRITE IT ALL DOWN AT UNITS AND THE OLD STAT
common is different by installer so you gotta look at the units or you will blow out your transformer this wire will be blue or brown
24v always red
compressor always yellow
fan always green
reversing valve always orange
heat w1 always white
emergency heat will be either brown or black dependinting on installer if its a heat pump this it what you have but if its a gas system its much easier
red- 24 volt with a jumper already on the new stat
white- heat w terminal
yellow- cool y termina
fan green- g terminal
and common is optional with batteries so its not needed
if you need further help email pendletonheatandair@hotmail.com

Sep 20, 2010 | Heating & Cooling

1 Answer

I install new RTH7500D thermostat Honeywell, when I set for Cool it blowes heat when I set for a Heat nothing works I wire per instruction have two stage system


Hi,
It sounds like the t-stat is programmed for a heat pump or you have a heat pump and the t-stat is programmed for a regular furnace....
Check out the manuals in the tip and go into the installer setup to change the t-stat to the proper programming for your system..

http://www.fixya.com/support/r3902153-honeywell_rth7500d_thermostat

heatman101

Apr 24, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

There is five wires yellow, green, red, white, the problem that we a facing is to connect these wire into the honeywell theromostat RTH3100C1002-0916


yellow is the cool wire, green is the fan wire, white is the heat wire, red is the power wire. these stats should have a 1 letter icon ,r for red on stat y for yellow and so on ,make sure that Rc and RH are jumpered and install batteris if needed

Sep 29, 2009 | Honeywell Electronic Programmable...

2 Answers

Thermostat


Heat pump Thermastats have Terminals RYW/OW2 G C. I run into this a lot with people buying tStats at home depot. To wire three sages of heat you must have correct tstat. one stage cool and three stage heat. You have to have enough wires at the Tstat. I use white first stage brown second and grey or black third. Make a diagram where each wire goes. Remember to trun of air handler power or you will short the transformer or blow low voltage fuse. Yellow cool, green fan, most of the time blue is c unless it is a battery tstat. orange is O. Red R ot power wire. Rusty

Jun 03, 2009 | Heating & Cooling

1 Answer

Fuse Blows when diagramed wiring is used on GMP125-5


i would check your thermastat wiring if you blow the fuse you have a dead short those fuses are saving you alot of money. remove all wires from terminals for t stat on furnance and jump between r and w if it works your problem is in wiring ..........

Feb 26, 2009 | Goodman GMS90703BXA Heater

1 Answer

HELP!! I got a problem with my A/C


I looked at the pdf file page 20 of page 124 for t-stat says for a Y594g1476 to remove the jumper IF W1 is used. I don't know if you have 2nd stage of heat such as electric heat. I would check wiring according to your outdoor unit and indoor unit and the t-stat. At the very least you will need R and it looks like X terminal giving you the 24 volts. for the control circuit. O is for the reversing valve. G for the blower. Y for the compressor contactor. W1 goes to the fan section to operate 2nd stage heat if you have it.You can also remove the t-stat and make sure you have the correct subbase which the PDF file shows for a y594g1476 stat it should be a Q674 series. Also what you can do with the stat off is jump out R to G to O to Y that should bypass the t-stat and bring on the fan and compressor contactor and the reversing valve. ( reversing valve is energized in the cooling mode ) see what happens ,you may have a built in 5 minute timer before it starts.I was unable to find the PDF on your Tempstar. So I am not sure what the outdoor coil temp. sensor is. I know that to initiate a defrost heat pumps use an outdoor sensor strapped on the outdoor coil bend. it usually labeled DFT (defrost thermostat ) but that should only work in the heat mode. Also they may show an OPITIONAL outdoor sensor/stat to stage 2nd stage of heat if using electric heat. But as far as I know that is installed by the contractor and is optional. In closing I would double check the control wiring from the t-stat to the outdoor unit to the fan section. Then I would bypass the t-stat with the method I told you. You can also take it one step at a time R to G blower fan starts .R to O reversing valve energizes. R to Y compressor contactor closes (after 5 minutes).Also the PDF shows an optional outdoor sensor that hooks up to the thermostat. If your handy with a volt meter check that you have 24 volts between R and X terminal at the stat

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