The S1 and S2 terminals on the Honeywell are for a remote optional sensor. Your Honeywell may have been using the S1 and S2 terminal to determine when to switch from heat pump to gas.
What does S1 and S2 mean on a thermostat?
S1 & S2 or (Outdoor 1 and Outdoor 2) Some tstats have this terminal. Furthermore, these are for an outdoor temperature sensor. Special shielded wire is used for this run and completely separate from the other thermostat wires. Finally, some manufacturers will show this the T terminals on their thermostat.
What are the S1 and S2 terminals for on a thermostat?
L: This terminal is designated for indicator lights on the thermostat, sometimes for when auxiliary or emergency heat is turned on, or if there’s a general problem with your system.S, S1, S2: These wires run directly outside and provide outdoor temperature information to the thermostat.
What does S mean on Honeywell thermostat?
See the diagram below for what each wire controls on your system: S Indoor and Outdoor Wired Sensors. Y Compressor Stage 1 (Cooling) Y2 Compressor Stage 2 (Cooling) G Fan.
What is X2 on a Honeywell thermostat?
W1 is 1st stage heat, W2 is 2nd stage heat and X2 is for Emergency Heat.Given that Aux Heat and Emergency Heat are just one equipment. Cap-off X2 wire and label it as X2, then push inside the hole.
What is the difference between R and RC on a thermostat?
They are normally connected together. If a system has 2 separate transformers , one for heating and one for cooling R is the heat power and RC is the cool power.
Do I need a jumper from R to RC?
If you have a wire in the R terminal, and no wire in the RC terminal, use the jumper selector switch, the jumper plug, or a small jumper wire to connect the R and Rc terminals.If you have a wire in the R terminal, and another wire (not a jumper) in the RC terminal, you will not need to connect the R and RC terminals.
What does the R wire do on a thermostat?
The R wire is the power wire for your heating and cooling system. If you only have one R wire (no Rh or Rc), you can connect your R wire to either Rc or Rh on the Nest thermostat.
What do the letters mean on a thermostat terminal?
Thermostat Terminal Letters
G: The G terminal controls the fan relay and is responsible for turning the blower fan on and off automatically or manually via the thermostat. RC: The RC terminal is the 24-volt cooling power supply.W/B: The W/B terminal controls the heat relay or valve.
What is the R terminal used for on a thermostat?
power for
R – The R terminal is the power for the thermostat. This comes from the transformer usually located in the air handler for split systems but you may find the transformer in the condensing unit.
What are the codes on a Honeywell thermostat?
Honeywell Thermostat-Specific Error Codes
- 164Heat pump must be serviced.
- 168Wi-Fi radio error.
- 171Set date and time.
- 173Thermostat temperature sensor error.
- 175AC power resumed.
- 181/182Replace air filter.
- 184Install a new humidifier pad.
- 185Put in a new dehumidifier filter.
What is X2 on mercury thermostat?
X2=emergancy heat(black)This is interconnected to the outdoor unit also to bring on heat strips during defrost. W=2nd stage heat(white)This will more than likely be your W2 designation on new t’stat.
Where does the X2 wire go on a thermostat?
X2 and W thermostat wires are commonly both connected to the W terminal of the new thermostat. Most times they are connected together at the air handler anyways.
What does X2 mean on a Trane thermostat?
The X2 circuit is to bring on the supplemental heat during the defrost cycle. Whether it is connected, is up to the customer.
Do I need a jumper wire on my thermostat?
If your HVAC system has both heating and cooling functions, you’ll need to connect both the Rc and Rh terminals with a red wire. Because many thermostats come with a pre-installed thermostat jumper wire that connects these terminals, you only need one red wire, which could be the thermostat Rc wire or the Rh wire.
What is the common wire for on a thermostat?
C-wire
A C-wire, or a common wire, runs from your low voltage heating system (24v) and carries continuous power to your thermostat. In today’s electric market, most newer heating and cooling systems have C-wires, which guarantees compatibility for the installation of all smart thermostats.
What color is RC wire on thermostat?
Red
Thermostat Wiring Color Code Chart
| Marking | Wire Color Code | Description |
|---|---|---|
| Rc | Red | Power from cooling, 24 Vac transformer |
| Rh | Red | Power from heat, 24 Vac transformer |
| C | Black/Blue | Common of 24 Vac transformer |
| W | White | Primary heat cell relay |
Why is there a jumper between R and RC?
Effectively there isn’t a second RH wire, although there is an RH terminal. However, the heating still needs to be controlled, so a wire known as a jumper is connected between the RC and the RH terminals so that power gets to the heating control part of the thermostat.
Do I need a jumper between RH and RC?
Nest thermostats don’t use jumper wires
Instead of using jumper wires, Nest Learning Thermostats use an internal jumper between the Rh and Rc connectors.If your current thermostat has a jumper wire, do not enter it in the Nest app to get a wiring diagram or o?connect it to your Nest thermostat.
Does the red wire go to RC or RH?
If you have both an Rh (Red-heat for powering the heating) and an Rc (Red-cool for powering the cooling), then the R wire can be connected to either Rh or Rc.If you only have a single R wire, then it will only have an R connector, which is the connection you’ll use.
What are R and Rc wires on thermostat?
The RH wire refers to red heating which means that this is the connection you need in order to power the heating system of your air conditioning unit.The RC wire, on the other hand, refers to red cooling. It’s the same with the RH wire in that it powers the thermostat. For the RC, it powers the cooling system.
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