Table of Contents
What does O stand for on thermostat?
The O/B terminal is for heat pump systems and is used for the reversing valve. When the “O” option/position is selected the reversing valve defaults to the heating mode. 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.
What color is O on a thermostat?
Orange Marking Wire Color Code Description G Green Fan relay O Orange Change-over relay to cool relay B Blue Change-over relay to heat relay A Heat and cool active to any relay.
Should my thermostat be set to O or B?
Generally speaking if the heat pumps are going to climates like Arizona and Texas, in your thermostat settings you should select B. For climates where we get a lot of freezing winter weather you are going to select O, but not always.
What does the terminal O on a heat pump thermostat control?
The O terminal is used when the system that you are using has a reversing valve (or four way valve) which is turned on when running cooling mode. In this case the terminal W2 will be present. Some thermostat may have a feature called Emergency Heat where when set, it will shut off the heat pump.
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.
Is heat pump O or B?
The heat pump is ‘O’ if it energizes in cooling and ‘B’ if it energizes on heating. Thermostats use the B terminal in systems with a reversing valve that turns on with heat mode. The system uses the O terminal if the reversing valve turns on while running cooling mode. Some people confuse their wiring.
What do the different color wires mean on a thermostat?
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 is white wire on thermostat?
The white wire underneath your thermostat connects to your heating system. It terminates at your air handler or furnace. The white wire connects to terminal W in industry-standard thermostats.
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.
Should my thermostat be set on gas or electric?
With it set to gas the furnace controls when the fan comes on. When set to electric the thermostat activates the fan. With electric furnaces the fan should come on right away. If there is a delay or the fan doesn’t come on at all then you have a problem.
What should I set my thermostat to in the winter?
For winter, the ideal thermostat temperature is 68 degrees Fahrenheit when you’re at home. Energy.gov 68 degrees is a good room temperature while you’re awake at home, but recommends lowering it while you’re asleep or away. Lowering your thermostat 10-15 degrees for eight hours can reduce your heating bill by 5-15%.
Should the air be on auto or on?
Keeping your fan on AUTO is the most energy-efficient option. The fan only runs when the system is on and not continuously. There is better dehumidification in your home during the summer months. When your fan is set to AUTO, moisture from cold cooling coils can drip and be drained outside.
What terminal on a thermostat controls the call for heat?
W/B: The W/B terminal controls the heat relay or valve. When the thermostat calls for heat, a signal is sent to power up the furnace and the blower fan or the boiler, heating your home. Y1: The Y1 terminal is used for the compressor contact in a single-stage heat pump installation.
What color is the o’b wire?
O stands for orange and B for dark blue. The O and B terminals are for heat pumps; the B terminal is used in conjunction with Rheem, Ruud, or any other manufacturer that energizes the reversing valve in the heat pump’s heating mode.
What does o B wire mean?
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. Sometimes it might be a single O/B wire instead of two separate wires.
What is O and B on nest?
A Nest thermostat’s star connector or. O/B connector can be used to control several different system functions, depending on what type of system you have. For example, you can use the star connector to connect a wire that controls a humidifier or dehumidifier, or emergency heat.
