What All Those Letters Mean on Your Thermostat’s Wiring ...

Emergency heat is only used if there’s a problem with your heat pump. ACC: Some thermostats have this terminal to connect equipment like a whole-house humidifier or dehumidifier. 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.

How to Wire a Heat Pump for Control - There may be a time when you will want to change your old heat pump thermostat with a new heat pump thermostat. We have other articles here that will help you with thermostat wiring.These other articles help you with thermostat wiring colors and thermostat wiring diagrams.In this article, we will provide specific information for wiring a heat pump for control.

Heat pump thermostat wiring - A typical wire color and terminal diagram. As shown in the diagram, you will need to power up the thermostat and the 24V AC power is connected to the R and C terminals. The color of wire R is usually RED and C is BLACK. C is known as the common terminal. These two connections will ensure that there is power to the thermostat that you are operating.

Heat Pump Thermostat Wiring Chart Diagram - HVAC - The following graphics are meant as a guide only. Always follow manufacturers instructions for both the thermostat and the HVAC system. Additional articles on this site concerning thermostats and wiring can help you solve your problem or correctly wire a new thermostat.

(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.) Y/O: The Y/O terminal is used to control the cooling condenser. When the thermostat calls for cooling, signals are sent to power up the condenser and the blower fan, cooling ...

Wiring a Heat Pump Thermostat to the Air Handler and Outdoor Unit! Functions, Terminals, Colors! - Duration: 15:52. AC Service Tech LLC 264,324 views. 15:52. Thermostat Wiring - Duration: 7:13.

Thermostat Wiring Color Code. Typically, a furnace plus A/C HVAC system has four or five thermostat wires and a common wire. A heat pump system, on the other hand, has eight or more different thermostat wires. Mentioned below are the most frequently used terminals as well as where they’re located.

3 - 16 Wire Hookup (2 for Outdoor Sensor) (2 for Optional Remote Indoor Sensor, ... 1 Stage Heat Pump 2 Stage VS Gas Furnace no BKDF-4 1 Stage Heat Pump 1-2 Stage Non-VS Gas Furnace no BKDF-5 ... 2.If an existing thermostat is being replaced: a.

This is why on many old thermostats you would jumper Y1 and W1 in a heat pump application. W2 – Means second stage heat. This could be the first stage of heat strips in a common southern heat pump, the gas furnace backing up the heat pump in a modern “hybrid heat” application or just a second heat strip bank in the case of a straight electric system.

C terminal will use the blue or black wire (Common wire, It enables the continuous flow of 24 v AC from the Red wire.) G terminal will use the green wire. (Fan) Y terminal will use the yellow wire. (Air conditioner) W terminal will use the white wire. (Heat)