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Diagram for s plan central heating control cicuit plus frost stat

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SOURCE: keston c40 honeywel 9400c programmer

do a s plan plus and buy a poly plumb roomstat combined programer with built in relays as you require the relays to stop back feed! simple!

Posted on Jul 23, 2008

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Goodman gph1348m41ac unit is blowing cool air in heat mode with mid 30s ambient outdoor temp. I turn it off then on and will usually blow warm air but this cycle is becoming more repetitive. any expert...

A heat pump on the optimal heating day (about 50 degrees ambient) will only deliver approximately 85 degree air as compared to 125 degree air from a fossil fueled furnace. The colder the outdoor air is the less heat there is available to be transferred to the living space. At 30 degrees, the heat transfer capability is getting close to negligible meaning the run cycles will be approaching continuous and eventually as the heat pump along cannot maintain setpoint, the outdoor stat or stats will bring on auxilliary heat in the air handler.

If your ambient temp is below the 'balance point' of the heat pump, the house temp will drop a little lower and most times energize the heat strips through the outdoor t-stat. Your outdoor stat could be set too low for the heat pump to carry the structure all the way down to the balance point so when you turn it off and back on, the lower indoor temp automatically brings on the heat pump plus a heat strip or two, thus the warmer air. Second stage on the stat satisfies due to the heat strip, drops them out of the circuit and the heat pump is left running on first stage heat delivering the perceived cold air.

Your outdoor stat could also be not functioning correctly and not allowing the heaters to come on until the system is turned back on reestablishing the two stage call for heat.

Tons of possibilities and not enough room to list....

Jan 01, 2015 | Goodman Manufacturing Goodman GPH1348M41 4...

2 Answers


R Red 24 volts coming from equipment to stat
W White First stage heat (could be W1)
W2 Second stage heat
Y Yellow First stage cooling (could be Y1 on your stat)
Y2 Second stage cooling
G Green Blower
C Common (Neutral)
B Reversing valve for heat pump
O Reversing valve for heat pump

If you have singles transformer system. Rc and Rh will be connected.
If you have 2 separate systems. i.e. Boiler heat and Central Air. Boiler Red to Rh and C.A. red to Rc.

Jan 18, 2011 | Hunter Heating & Cooling

1 Answer

I bought the amcorair one of the inside units is not working right. IT IS SET ON 72 degrees and it does not cut on even at 66 degrees.

Hi, from what you are saying, it sounds as though you have a control/thermostat problem. You say it doesn't work right, so I am assuming it does work, but just does not come on when the stat calls for heat. Make sure you have 24 volts to the stat. Turn the fan to the on position to see if it comes on. If so, you have power. If the heat is not coming on at 66 degrees, and you have it set to call for heat below 72, you do have a problem with this stat. The room sensor is mounted in the circuitry of the subbase, or second section of the thermostat. There is nothing you can do to repair this stat, your only option is to replace it. If you have both heating and air, you will need a stat for that. If you have gas heat get a regular central heat and cooling stat, 24 volts. If you have a heat-pump, you will need a heat pump stat. The best thing to do, is shut off the power to the indoor unit. Remove the first section of the stat, it should just unsnap. You may need to pull some to get it off. Then you will see the subbase with the wire terminals. If you have gas heat, it will be marked something like this. RH to RC with a red wire connecting the two. You will have a smaller red wire coming in from the indoor unit which can go to either one. You will see Y yellow for cool, W white for heat, G green for fan. If its a heat pump stat, you will have many more terminals such as o/b, may have E and C, w-1, w-2. Draw you a diagram of the wiring and the terminals they go to. Now, remove the subbase. It will be held to the wall with a couple of screws. Take it with you, and go to Home Depot, Lowe's Hardware, O.S.H. to get a stat. Try and find the same one, but it will not matter as long as you have the same terminals. Many stats will work on many units. Install it in the reverse order. This drawing is very important for you. This will indeed solve your problem, and is very simple to change out. If you have any questions when doing this, please contact me, as I will check in on you. It may take time for me to respond if I am on another call. Please don't forget to rate me on this, I know you will be kind! :))
A/C, & Heating Contractor PS, Don't loose the manual for your new stat!! Put it in a safe place, this is very, very important.

Nov 21, 2010 | AmcorAire UCHW-H12AF2 Split System Air...

1 Answer

Runs cooling and heating back and forth, when colling set at 73 and heating 65 , wont come off 73 degrees , bad t stat ? or outside temp sensor please help thanks chris

Hi, Chris, this is the thermostat for sure. It has a built in sensor on the circuit board that gives the stat the command to do what its supposed to do. From what you are saying, it has to be the stat. Be sure you mark the wires on this stat, if you have a gas furnace with this central unit, the stat will have markings at the terminals like this, Red wire to either the Red R/C, or R/H with a jumper across the 2, a W, white for heat, Y yellow for cooling circuit, and G green for the fan control. The new stat will come with the red jumper installed for you. Now, if you have a heat pump, the terminals will have more wires such as a R, O, B, W, W-1, Y, G, C, and so on. Heat-pump wiring is much more difficult to install the stat as it has to have the same terminals and if they are not terminated right, you will have problems. You may want a pro to wire it in for you only if you have a heat-pump. If its just a standard stat like I 1st said, turn off the breaker and it is simple to install. The voltage is only 24 volts ac. Please don't forget to rate me Chris as I know you will be kind, and I will also be checking in on you to see how it is going. You can also contact me if you need more help by my user name below.
A/C, Heating, & Refrigeration Contractor.

Sep 03, 2010 | Heating & Cooling

1 Answer

No heat coming from central air unit when heat is turned on.

check t stat make sure its set up for you system some stats have to be set up for a heatpump or iits gas or electric heat

Feb 25, 2009 | Heating & Cooling

1 Answer

Intertherm central unit heating side not working right

I am assuming this is a heat pump? (Typical when the t-stat has a green light.).

Please confirm

If a heat pump, is the outdoor unit frozen up? There can be some frosting, but it should not be a block of ice.

If there is an emergency heat switch on the t-stat, can you flip that to emergency heat? Do you get heat then?

Pleas advise and I can help you troubleshoot this problem further.

Jan 30, 2009 | Intertherm P3RA-060K Air Conditioner

1 Answer

Central heating system boiling

more information required but if the boiler supplies the domestic hot water cylinder then the stat on the cylinder may be bringing on the boiler also the boiler stat may be up too high try turning it down.

Jan 05, 2009 | Heating & Cooling

1 Answer

Gas heating/electric a/c unit

YES! just remove the cover and you'll see 4-wires r-red=power g-green=fan w-white=heat &y-yellow=cool: just take a jumper wire and connect r-to- g and y...!_

Sep 09, 2008 | Heating & Cooling

1 Answer

Central air

First turn your thermostat to the fan on selection, if this allows the blower to run then replace the stat. If blower will not run in on selection it is either a bad control board or blower motor. I can walk you through getting the blower on if the board is bad so it will operate until you replace it. Thx RepairUSA

Aug 25, 2007 | Carrier 38CKC042 Air Conditioner

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