Table of Contents
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.
What does the G terminal on a thermostat energize?
The G terminal is for the indoor blower fan relay. This gets its 24 volt power from the R terminal and energizes the indoor fan on a call for the fan to run or a call for cooling.
Can I use the G wire for the C wire?
If there is no hidden C-wire, you can use a G-wire instead. However, you will not be able to use your fan independently when the heating or cooling isn’t running. Also, many HVAC systems are incompatible with this solution, including: HVAC systems using electric heat.
What are the connections on a thermostat?
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.
What is the Y for on a thermostat?
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 do the letters stand for on thermostat?
W, W1, W2: Just like the Y wire, the W wire(s) control the heating aspect of your system. 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.
What is the K terminal on Honeywell thermostat?
The K terminal located on the Honeywell thermostat combines the Y and G wires. It does this using the Honeywell wire saver. The Wyze system is not compatible with the Honeywell wire saver. However, your system will be compatible with the Wyze thermostat once the Honeywell wire saver is removed.
What if there is no C wire for thermostat?
If your current thermostat didn’t need a C-wire, it (or a wire that can be used as a C-wire) might be rolled up inside the wall. This wiring indicates a line voltage system, and you’ll need an adapter or a smart thermostat designed for line voltage.
What is the color of C wire in thermostat?
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 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).
What does conv and HP mean on a thermostat?
CONV Select for conventional systems. HP. Select for heat pump systems. F. Select for fahrenheit temperature scale.
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.
Does my heat pump use an 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 is Y2 on thermostat?
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.
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 is X2 on a thermostat?
W1 is 1st stage heat, W2 is 2nd stage heat and X2 is for Emergency Heat. Given that Aux Heat and Emergency Heat are just one equipment. Cap-off X2 wire and label it as X2, then push inside the hole.
Where does K wire go on Nest thermostat?
Great success, I was able to find this really simple video (no illustrations) that stated that all you needed to do is to insert the K Wire from into the Y1 slot of the Nest Thermostat.
What is the difference between R and RC on a thermostat?
They are normally connected together. If a system has 2 separate transformers , one for heating and one for cooling R is the heat power and RC is the cool power.
What are W1 and W2 wires?
W/W1 and W2. In a conventional system, W/W1 controls your heating system and, where applicable, W2 controls your heating system’s second stage, which helps warm the home faster. If you have a heat pump system with auxiliary heating, you’ll normally connect the AUX/AUX1 or W2 wire to the ecobee’s W1 terminal.
