The unit defaults to Heat and when engaged the valve … Please check your heating and cooling system manual or consult a professional HVAC technician if you do not know which option to … Then of course there are some crazy ass carrier commercial units that use a control board to control the reversing valve based on a y or w call from the stat with no o or b used at all. The reversing valve, controlled by the thermostat, causes the change-over from heat to cool. This control for the reversing valve in the condensing unit. 18 MENU Cool On (o) Heat On (b) Selects operation of the reversing valve terminal (O/B) output as an O or B terminal. The O wire reverses the valve from heating to cooling, and the B wire switches the valve from cooling to heating. The job of the reversing valve is to change the direction of the flow of refrigerant in your system; this is how the heat pump changes modes between heating and cooling. How Does the Reversing Valve Work? Low Voltage O & B Terminals On a heat pump, the Y terminal isn’t really a “cooling” signal, it is now a circuit that energizes the compressor contactor in both heating and cooling. Unit Configuration Select your home’s heating type, stage configuration for heating and cooling, and type … O/B – Reversing valve for Heat Pump systems. Emergency heat should only be used on very cold days when the heat pump is unable to keep the house warm. 218 = Reversing Valve O/B 0 = O (O/B in Cool) 1 = B (O/B in Heat) Note: This option is only displayed if the Heat Pump is configured. However, it is the reversing valve that allows the heat pump to change from cooling to heating and back. This is one of the leading causes of compressor failure on heatpumps. Verify the configuration of the reversing valve (O/B terminal), as it could be backward (heating when calling for cool, cooling when calling for heat). Verify that the Y terminal is activated/wired properly with a digital multi-meter, listening to clicks, or manual test. I tried everything. 5 INSTALLER/CONFIGURATION MENU 1) Keypad Lockout – This menu selection will display Emergency heat is only used if there's a problem with your heat pump. 3 Installation and Cautions Installation Heat pumps and heat/cool units: many original equipment manufacturers connect the system tubing to the Ranco reversing valve based on which mode (heat or cool) the system will operate, should the solenoid coil fail. 19 RUN SCHED Returns to Normal Operation. For example, solenoid coil energized for This determines whether you are going to heat or going to cool. O/B 6 (not shown) - 3 wire zone valve Reversing Valve or output for 3 wire zone valves Configurable as “O” or “B” Reversing Valve or 3 wire zone heat (power close) Y 1st Stage Compressor G Fan Relay W/E 1st Stage Heat (conventional); 1st Stage Auxiliary Heat (heat pump) Can operate as Emergency Heat only (See Installer Menu #15) Select whether reversing valve O/B should energize in cool or in heat. im considering buying a armstrong heat pump to add to my existing gas only furnace to make it dual fuel. If you have a heat pump system, place it into the O/B terminal. E. Some thermostats for heat pumps have an E terminal, which toggles emergency heat on or off. Select whether reversing valve O/B should energize in cool or in heat. His conclusion was my Nest was not engaging the O/B cable to engage the valve. Locate any unconnected wire labeled W or W1. Even when the thermostat is not calling for cooling the reversing valve between “O” and “C” should be energized with 24 volts AC. A heat pump is a device designed for heating, cooling and dehumidifying. 220 Cool Stages / Compressor Stages 200=Conv / 200=HP (149.14 kW) 0, 1, 2 Note: Select how many Cool or Compressor stages of your equipment 218 Reversing Valve O/B 0 = O (O/B in Cool) 1 = B (O/B in Heat) Note: This option is only displayed if the Heat Pump configured. In a heat pump, the compressor may be the heart of the system, but the reversing valve is the nerve center. Angella, this problem sounds like a wiring or thermostat problem to me. The reversing valve is a somewhat delicate component that has a pipe on the bottom and three on the top. Unit will not run: a. 218 Reversing Valve O/B 0 = O (O/B in Cool) 1 = B (O/B in Heat) Note: This option is only displayed if the Heat Pump configured. Check for unit voltage at contactor in unit. Thanks! Residential heat pump thermostats generally have an "O" terminal to energize the reversing valve in cooling. (Tapping on the valve, making sure there was power to the valve, made sure that I was using the B terminal instead of the O terminal, etc.) What is the correct setting for the Changeover Valve on my Rheem RHQA 1315j heat pump? Some residential and many commercial heat pump thermostats use a "B" terminal to energize the reversing valve in heating. When the "O" option/position is selected the reversing valve defaults to the heating mode. But when calling for normal heat, it goes into the cooling cycle. Select : whether reversing valve O/B should energize in cool or in heat. E – Emergency Heat. If the reversing valve is turned on when running heat mode, you will need to connect the reversing valve to B terminal. Basically before heat pumps refrigerant flowed one direction. valve manufacturers are reluctant to recommend it. i have got a chance to get a great deal on a armstrong a-coil and heat pump. Nest Thermostats, Android, Google Nest Device. Two types of reversing valves were developed, a poppet-type and a slide-type. 218 Reversing Valve O/B 0 = O (O/B in Cool) 1 = B (O/B in Heat) Note: This option is only displayed if the Heat Pump configured. d. Defective reversing valve: d. Replace reversing valve. Slap a reversing valve on there and when it calls for heat the reversing valve gets energized and the flow is backwards. Heat Pump System Configure the reversing valve for O (energized in cool) or B (energized in heat) and enable/disable Emergency Heat and/or Auxiliary Heat. The reversing valve is energized when there is a call for heat Anyway Ruud sent me a new reversing valve. 1. lennox energize in cooling for instance. 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