Table of Contents
How many wires do you need for a heat pump?
In heat pump system, there are at least 8 wires that need to be connected to the thermostat for proper operation.
What wire controls heat pump?
W Wire Terminal Designation – This color is typically white and goes to the W terminal. In a heat pump, this is for the backup heat source. Whether it is electric heat strips or a gas furnace (dual fuel), the W terminal controls this. This wire will also run to the air handler/furnace and the condenser.
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.
What color wire is emergency heat?
Thermostat Wiring Color Code Chart Marking Wire Color Code Description W White Primary heat cell relay E Brown Emergency heat relay Y Yellow Primary cool call relay Y2 Yellow Secondary cool call relay.
Does a heat pump need a neutral?
Since your heat pump does not need the neutral, you simply cap it off with an appropriately sized wirenut. The ground, then, lands on the ground bar in your disconnect (even though it gets called a neutral bar, it’s really a ground bar here).
What is W2 wire on heat pump?
W2 wire – heat. Y wire – cooling compressor. Y2 wire – cooling compressor. RH (or) R wire – power. G wire – fan.
What is the blue wire for on a heat pump?
C wires or varying colors apply to every thermostat, but blue C wires belong to thermostats attached to a heat pump. Blue wires are for heat pumps. This wire connects to terminal B on your thermostat.
What color is the 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.
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 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 are the 4 wires on a thermostat?
4 Wire Thermostat Wiring (Heat Pumps, HVAC) 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).
Where do thermostat wires go?
Thermostat Wiring Tips If your thermostat controls your heat, you will have a white wire. The Y wire is yellow and connects to your air conditioning compressor. The G wire is green and connects to the fan. Rc and Rh: The red wire(s) are the power source for your thermostat.
Do I have O or B wire?
Look for connectors that have labels that are the same as your thermostat. For instance, you might find labels like R, W, G, Y, C or O/B. You should find wires attached to these connectors that are the same color as the wires that connect to your thermostat.
What is B on heat pump?
The O/B terminal is for heat pump systems and is used for the reversing valve. If the “B” option/position is selected the reversing valve defaults to the cooling mode. It is extremely import that the correct mode is selected. If you get it reversed the heat pump will cool in the heat mode, and heat in the cool mode.
What is thermostat o’b wire?
O, B, O/B: These wires are responsible for switching the changeover valve in a heat pump system. The O wire reverses the valve from heating to cooling, and the B wire switches the valve from cooling to heating. Emergency heat is only used if there’s a problem with your heat pump.
What is W2 and Y2 thermostat?
Y2 – This is the thermostat terminal for cooling second stage if your system is so equipped. W2 – This is the thermostat terminal used for second stage heat. There are gas furnaces with low fire and high fire and some depend on control from a two-stage heating thermostat with a W2 terminal.
What color wire is W2?
Traditional Thermostat Wire Color Codes Color Terminal Use Light Blue 2 Y2 Switched to Cooling White W Switched to Heating Brown 3 W2 Switched to 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.
