Table of Contents
Y – This is the terminal for cooling or air conditioning and goes to the compressor relay. Typically a thermostat wire pull is made to the air handler on split systems and then this wire is spliced for the separate wire pull which is made to the condenser.
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 is the difference between Y1 and Y2 on a thermostat?
In conventional cooling systems, Y/Y1 controls the first stage of cooling and Y2 controls the second stage, which helps cool down the home faster.
Where does Y1 wire go?
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.
How many wires should a thermostat have?
The most basic thermostat has 2 wires; usually a red and a white wire. Two wire thermostat wiring is used for furnaces only and usually doesn’t need a “C” or “Common” wire.
What do the letters mean on a thermostat?
Thermostat Terminal Letters Refer to the thermostat manufacturer’s wiring diagram for precise connection information. (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.)Jun 8, 2021.
Is Y1 the same as Y thermostat?
Y, Y1, Y2: Whenever your thermostat calls for cooling, the Y wire is used to send a signal to your HVAC system telling it to fire up the air conditioner. Y1 and Y2 wires might be used instead if you have a two-stage system (i.e. a high level for extremely hot or cold days, and a low level for mild days).
Can you jump Y1 and Y2?
applications, a “jumper” may be required between “Y1” and “Y2” at the furnace control in order to achieve the desired single stage cooling airflow. features require a jumper between “Y1” and “O.”.
What does Y1 mean on a thermostat?
Y or Y1. 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.
Why am I not getting power to my Nest Thermostat?
A “No power” alert can be caused by the following: The thermostat wiring is incorrect. Your thermostat is connected to a system that requires a C or common wire, but that wire isn’t connected. Some systems, including heat-only, cool-only, zone-controlled, and heat pump systems, require a C wire or Nest Power Connector.
Does my heat pump use O or B wire?
Your heat pump uses O and B wire. O wire shift the reversing valve from heating to cooling while the B wire does the opposite (Cooling to Heating). The O and B wires are easy enough to spot because they are ‘Orange’ and ‘Dark Blue,’ respectively.
Where does orange wire go on Nest thermostat?
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.
What color is L wire on thermostat?
Thermostat Wiring Color Code Chart Marking Wire Color Code Description O Orange Change-over relay to cool relay B Blue Change-over relay to heat relay A Heat and cool active to any relay L Emergency heat active lamp.
What color thermostat wires heat?
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).
What wire do I run for my 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.
What do the letters Y and W represent on a thermostat subbase?
Y = yellow, g = green, r=red, w = white. Generally the red is your “hot” wire, straight from transformer that supplies constant power to your thermostat, which when each function, ie, cool, or heat is engaged, allows connection between red and whichever wire is called for by the thermostat.
What does B stand for on thermostat?
A wire labeled O, B, or O/B is used to control whether a heat pump is in heating or cooling mode. However, on some thermostats, a wire labeled B is the common wire C. In most cases, the common wire is labeled C.
What does S1 and S2 mean on a thermostat?
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 is auxiliary heat?
Auxiliary heat on your thermostat refers to your backup heating system within your heat pump, otherwise known as electric resistance heating. This is because when the temperature inside your home drops below the goal temperature you’ve set the thermostat to, your thermostat energizes auxiliary heat.
Is W e the same as W1?
Usually, you will only see W when the control only has one stage of heat. W1 – Means first-stage heat. In a heat pump, first-stage heat is the same as the first-stage cool. E – Is emergency heat, usually just a way to manually drive on what would normally be the secondary form of heat without stage 1 heating.
Does R go to RC or RH?
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. These are not jumper wires, and you can insert the Rc wire into the Rc connector and the Rh wire into the Rh connector.
