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Do I need them to install my new thermostat? An extra unused wire in the wall can be used as the C wire for your new thermostat. The extra wire will also need to be connected to the C (common) terminal at the heating and cooling system. This will provide power to your new thermostat.
This is the most typical thermostat wiring style, and it applies to systems that regulate both heat and air conditioning. The wires are typically arranged as follows: red for 24-volt hot, white for heat, yellow for cooling, green for the fan, and blue for common (although the common wire may be a different color).
In heat pump systems, Y1 controls your compressor, which heats and cools your home. If you have a two-stage compressor, Y2 controls your compressor’s second stage, allowing for different levels of heating and cooling.
The Y2 Wire on a Thermostat controls your cooling system and should be connected to the Y terminal on the Thermostat. If your HVAC system has two-stage cooling, there’ll be two Y terminals on your Thermostat to control two compressors.
Blue wires are also called “C” wires because they are the Common wire. C wires are necessary for any “smart” thermostat that needs to be connected to a power source 24/7, regardless of your heat pump type.
Quick Check for an Existing C-wire: If the thermostat loses power it does not have a C-wire, and you may need an add-a-wire kit. If it doesn’t lose power, locate your breaker panel. Flip the breaker for the wall with the thermostat on it. If it loses power, you likely have a C-wire.
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.
The most common thermostat cabling is 18/5 (18 gauge, 5 conductor), because 5 conductors typically offer enough functions for a modern thermostat/low voltage device.
1 “System On” indicates when heating or cooling stage is energized. “System On +2” indicates when a second stage is energized. 2 The word HOLD is displayed when the thermostat is in the HOLD mode. Temp HOLD is displayed when the thermostat is in a Temporary HOLD mode.
Let’s take a look at the G wire. This wire will go to the G terminal on your new thermostat. For the Y, Y1, and Y2 wires, Y or Y1 will go to the Y terminal, and Y2 will go to the Y2 terminal. The O/B wire can have many configurations.
In most systems, the Y or Y1 wire controls your cooling system. If you have a heat pump, your Y or Y1 wire controls your compressor. Your compressor is responsible for heating and cooling your home. The G or G1 wire controls your fan.
The Nest Thermostat is compatible with 2 wire low voltage HVAC systems that are either heat only systems or cooling only systems.
Y2 is the thermostat wire for second stage of cooling. Y wire is for the first compressor (air conditioner units) and Y2 wire is for the second compressors (air conditioner unit). Y2 wires apply only if you have two air conditioner compressor units running from one AC thermostat.
The C wire, or “common wire” enables the continuous flow of 24 VAC power to the thermostat. Technically speaking, power flows from the R (red) wire, but not continuously (not on its own, anyway). To make it continuous requires a common wire to complete the circuit.
It is easy to see if you already have a c-wire connected to your system. Simply remove your current thermostat face from its baseplate and look for the terminal labeled with the letter “c.” If this terminal has a wire attached to it, you have an active “c-wire.”
The C, or common wire, provides smart thermostats with continual power. It’s usually blue, but it may also be black, brown or purple. The O or orange wire connects to your heat pump (if applicable).
Replacing an outdated four-wire thermostat with a newer model that uses two wires is not complicated, once you purchase the thermostat from a home-and-garden shop or hardware store. The procedure to install the new thermostat is straightforward and does not require the assistance of a certified electrician.
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.
Option 1: Add a C Wire to Your Furnace Remove the access panel from the furnace and locate the thermostat wires and terminals. Connect an 18 AWG wire to the C terminal at the furnace. Next, remove the thermostat face plate. Now, run the new C wire from the furnace to the back of the new thermostat.
- Red wire for power (24V).
- White wire for heating (connected to W or W1 terminal).
- Green wire for fans.
- Blue or yellow wire for cooling (connected to Y).
- Black wire for “C” or “Common” wire.
If you see two wires coming out of it in the back you have a single pole. If there are four wires, you have a double pole. If you have more than four wires coming out of your thermostat, you most likely have a low voltage one, which would be used to control a central furnace, boiler, or something similar.
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.
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.
If your heating system has only two wires, the job of the thermostat is simple. All it has to do is turn the heat or the cooling on and off. … There’s also no thermostat blue wire, or common wire, to power the thermostat, so it has to operate on its own, either using batteries or mechanical temperature detection.
3 Answers. A butt splice connector, or twist-on wire connector would be fine. Just make sure you use connectors that are designed for the size, and number of wires being connected. Technically, you should probably either pull all new wiring, so that it’s continuous from HVAC to thermostat.
Ethernet cable should work fine since thermostats use low voltage and low current. For simplicity, it’s probably easier to use each pair as if it were a single wire.
Two-stage cooling means the air conditioner or heat pump has a compressor with two levels of operation: high for hot summer days and low for milder days. Since the low setting is adequate to meet household-cooling demands 80% of the time, a two-stage unit runs for longer periods and produces more even temperatures.
2nd stage is the full compressor capacity of your system. 1st stage is roughly 2/3 compressor capacity. Generally, 1st stage is a bit more efficient than 2nd stage, but systems are designed to use both stages, so no worries there. When it is cold outside, it is fine for your system to have long run times.
The orange wire connects to terminal O on your thermostat. The orange wire only applies to homeowners with an air-source heat pump. Only air-source heat pumps connect to your outdoor condenser.
W1 – Means first-stage heat. In a heat pump, first-stage heat is the same as the first-stage cool. It just means the contactor/compressor is turning on. Whether that is heat or cool is actually dictated by whether or not the O/B terminal is energized.
Here are some general guidelines: An R wire can go into a Nest Learning Thermostat’s Rc or Rh connector. The Nest Thermostat E only has an R connector, which is typically where an R wire would go.
If you short the R wire to the C wire, you’ve effectively created a very low resistance closed circuit across the secondary of the 24V transformer in the HVAC system. … Since the thermostat is on the secondary side of the transformer, the circuit breaker for the HVAC system may react too slowly, or not at all.
There is no standard for the colour of the RH wire, but most units use a red one. 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.