7 Wire Thermostat

18/7 Thermostat Wire is designed to be used in heating and air conditioning bell and alarm system controls. This cable is made of solid copper paralleled conductors that have been covered with a brown PVC jacket.

How many wires should be in a thermostat?

FOUR WIRES This is a popular configuration for a battery-powered thermostat or a digital thermostat that solely regulates heat. The standard configuration consists of 24-volt hot (red), 24-volt common (blue), heat (white), and a fan (green).

What is 8 wire thermostat wire for?

Uses for this wire includes controlling relays , powering transformers , as well sending 24 volts from thermostats to turn on/off your air conditioning unit or furnace. It can also be used for home automation and home alarm systems.

What kind of thermostat do I need for a heat pump?

A low voltage thermostat or control system is commonly used to connect with: Conventional gas forced-air furnaces. Single-stage or multi-stage heat pumps providing heating and cooling. Electric central air conditioning systems with forced-air ductwork.

What happens if you wire a thermostat wrong?

Potential consequences of improper installation could include: Electric shock. Blowing a circuit breaker. Damaging the thermostat unit, the electrical system or even the AC/furnace unit itself.

What color is C wire?

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.

How do you wire a new thermostat?

Here's how to wire a thermostat using the color code and, FYI, each terminal's purpose.

1. Attach the red wire to the R terminal (Call for heating and/or cooling).
2. Attach the green wire to the G terminal (Fan).
3. Attach the white wire to the W terminal (Heat).
4. Attach the yellow wire to the Y terminal (AC).

Does red wire go to RC or RH?

The RH and the RC wires are actually pretty easy to understand because they're straightforward. 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.

What does RC mean on a thermostat?

RC: The RC terminal is the 24-volt cooling power supply. RH: The RH terminal is the 24-volt heating power supply. (Note: The RC and RH terminals are jumpered together in a four-wire heat/cool system and a single-stage heat pump system but not in a five-wire heating/cooling system.)

How do you wire a 8 wire thermostat?

A typical eight-wire thermostat will have the following wire configuration: red wire to "R" terminal, white wire to "W" terminal, green wire to "G" terminal, yellow wire to "Y" terminal, black wire to "C" terminal, blue wire to "Y2" terminal, brown wire to "W2" terminal, and orange wire to "Aux" terminal.

Can you use phone line for thermostat?

Telephone thermostats, on the other hand, allow you to heat or cool your home with a simple phone call. Telephone thermostats replace your existing home thermostats. They connect to both the heating and cooling system and to your phone line.

What is T Stat wire?

Thermostat Wire is a class 2 power-limited circuit cable for use in thermostat control applications from floor to floor and up access shafts without conduit.

Will any thermostat work with a heat pump?

You need a special thermostat for a heat pump because it needs to be able to communicate with the reversing valve when changing from heating to cooling. Heat pumps rely on outside air and electricity. Heat pump thermostats will typically have a fifth wire explicitly for the reversing valve.

Can you use a regular thermostat on a heat pump?

This two-in-one heating and cooling function is not common in traditional boilers and heating systems, which makes air and ground source heat pumps stand out as all-purpose performers. Thanks to their specialised heating and cooling features, heat pumps need bespoke thermostats to work effectively.

What is the difference between a heat pump thermostat and a standard thermostat?

Where a standard AC thermostat uses four wires (hot wire, compressor and outdoor fan wire, indoor blower wire, battery wire) to run the unit, a heat pump thermostat requires a fifth wire to handle the change in the reversing valve. These wires are usually color-coded, and the reversing wire is the brown wire.

How do I know if I installed my thermostat correctly?

How to test if the thermostat is properly installed?

1. Step 1 – Turn off HVAC power.
2. Step 2 – Remove the thermostat cover. ...
3. Step 3 – Remove wires from terminals. ...
4. Step 4 – Turn HVAC power back on. ...
5. Step 5 – Test other wires. ...
6. The display. ...
7. Incorrect temperature. ...
8. Strange behavior.

Can I replace my thermostat with any thermostat?

Most replacement thermostats are compatible with all common systems. However, if your system is unique, finding a replacement thermostat may be difficult.

Is the C wire hot?

Typically, the wires that provide the power (often called the “hot” wires) are labeled Rc (cooling) and Rh (heating).

Is RC the same as C wire?

The C and Rc wires are not the same. To install this thermostat you should follow the exact same wiring of the previous thermostat.

Does Nest work without C wire?

Nest thermostats are designed to work without a C wire in most homes. But some systems may require a C wire for consistent power. The Nest Power Connector is a simple and affordable alternative to a C wire, and costs much less than hiring an electrician to install a new C wire through your walls.