What does the O and B wire do on a reversing valve?
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. They work in tandem with the reversing valve, a tool that affects the flow of refrigerant.
How does a reversing valve work?
This allows a residence or facility to be heated and cooled by a single piece of equipment, by the same means, and with the same hardware. The reversing valve has two states, relaxed (unactivated) versus energized. The energized state is typically achieved by applying 24 volts AC, which is commonly used in HVAC equipment.
What are the two states of the reversing valve?
The reversing valve has two states, relaxed and energized. The energized state is typically achieved by applying 24 volts AC, which is commonly used in HVAC.
What is operation Operation of reversing valve in heat pump?
Operation. The reversing valve has two states, relaxed and energized. The energized state is typically achieved by applying 24 volts AC, which is commonly used in HVAC. The heat pump can be designed by the manufacturer to produce cooling or heating with the reversing valve in the relaxed state.
What is OB on the 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 the OB wire on a thermostat?
It's usually blue, but it may also be black, brown or purple. The O or orange wire connects to your heat pump (if applicable).
Should my thermostat be set to O or B?
Check your configuration. Most commonly, O/B is energized in Cooling (O on cool). For Rheem or Ruud brand heat pumps, the O/B must energize on heating (B on Heat).
How do you know if a reversing valve is O or B?
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 is the O B wire?
O and B wires control when your heat pump cools or heats your home. B. May require local pro assistance if you have both an O wire and a B wire. O and B wires control when your heat pump cools or heats your home. In some installations, the common wire may be disguised as a B wire.
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.
How is your O B reversing valve energized?
O/B Terminals Also mentioned was the fact that reversing valves have a default position when they are not energized. Most manufacturers at this point default to heat (O terminal is energized for cooling), though there are some that still default to cooling (B terminal is energized for heating).
Does my heat pump use O or B?
On many other thermostats, the O wire is typically connected to a terminal marked W on one side and O or O/B on the other side; the W is for use with a conventional system (furnace) while O/B is for use with a heat pump.
What is B and O on Honeywell thermostat?
O/B (orange/black) is for the reversing valve on a heat pump. On the Honeywell thermostat, one terminal serves two purposes (O/B for heat pump reversing valve, or W, which is first-stage heat for a conventional furnace).
What is W1 O B 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 B terminal on thermostat?
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.
Is reversing valve energized in heat or cool?
The Reversing Valve Solenoid (RVS) is energized in cooling. Has some one changed the thermostat lately, and accidentally wired it to the "B" terminal, instead of "O"? Instead of learning the tricks of the trade, learn the trade.
What is a reversing valve?
A reversing valve a type of valve and is a component in a heat pump, that changes the direction of refrigerant flow. By reversing the flow of refrigerant, the heat pump refrigeration cycle is changed from cooling to heating or vice versa. This allows a residence or facility to be heated and cooled by a single piece of equipment, by the same means, ...
How is a reverse valve driven?
Depending on the construction and use of the heat pump, the reversing valve may be driven by the heat pump through the use of a defrost control board, or it may be driven directly by a thermostat (typically from the "O" terminal of the thermostat).
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).
How To Tell If Heat Pump Is O or B?
Check the configuration. The heat pump is ‘O’ if it energizes in cooling and ‘B’ if it energizes on heating.
What is the O Terminal on a Heat Pump?
The O terminal allows the heat pump to switch from heating to cooling. O position is an option that allows the reversing valve to ‘default to heating mode.’
What is the B Terminal on a Heat Pump?
The B position is associated with the reversing valve when it defaults to the cooling mode. The terminal switches the system from cooling to heating. B is the position that changes to the heat relay.
Does Heat Pump Have C Wire?
C wires matter to modern thermostats because they have many sophisticated features and functions. That includes internet connectivity and LED screens. Without the C wire, you cannot take advantage of all the functions an intelligent thermostat brings to the table.
