(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.) Reversing valves: Change the flow of refrigerant which determines if your interior space is cooled or heated. 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. With the reversing valve de-energized the flow reverses. This seats the piston so refrigerant must pass through the orifice. selenoid the reversing valve goes into heat. Also, with the thermostat in "system off", no voltages except on the R and RH terminals. I have found that the reversing valve is energized on the cooling cycle, but also even if thermostat is set to off position valve is still energized. Professionals can sometimes repair the reversing valve, put will often need to replace it. i have got a chance to get a great deal on a armstrong a-coil and heat pump. Your stat has no common. The reason for this is a key component called the reversing valve. The reversing valve has two states, relaxed (unactivated) versus energized. Figure 6. The heat pump can be designed by the manufacturer to produce either cooling or heating with the reversing valve in the relaxed state. A heat pump has a few extra parts that allow it to reverse the direction of heat exchange. The blue on the reversing valve should be common or C and the orange should go to the O terminal of the thermostat. This reversing valve solenoid, partially controlled by the HP thermostat, is generally energized in the cooling mode (except as noted above). Start studying Reversing Valve 4 Way- Valve Heat Pumps. heat so I could measure the voltage at the reversing valve and got 24 volts. Now let's complicate it a bit more.....While not in the majority, there are some units out there that instead of energizing the reversing valve in cool mode, they work in reverse and require that you energize the reversing valve in heat mode, typically using the B terminal and blue wire. In Figures 2 and 3, the pilot valve has been configured so that when the pilot valve is de-energized, the system is in the heating mode, and energizing the pilot valve the system is in cooling mode. It needs another expansion valve, and it needs a reversing valve. 4-Way Reversing Valve with operating control used for heat pumps. Refrigerant is the chemical mixture that allows for the heat exchange to occur. Reversing Valve and Solenoid. Typical wiring diagram for heat pump with reversing valve energized in COOL TRANSFORMER Reversing Valve* B O RC JUMPER WIRE Compressor Contactor JUMPER WIRE * Reversing valve is energized when the system switch is in the COOL position Fan Relay Y RH 24 VAC 120 VAC Hot Neutral THERMOSTAT SYSTEM G W Figure 7. Cool Low Pressure Gas. In a heat pump system when the reversing valve is energized (cool mode), the unit will run in cool mode and the refrigerant will follow the path indicated on the bottom. Some units use energized reversing valve during cool and some de-energized. Voltages is ~24v ac. there should also be a setting in the menu telling it whether to energize reversing valve on heating or cooling. 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. This will energize the reversing valve to go into cooling. Coils: The condenser and evaporating coil heat or cool the air depending on the directional flow of refrigerant. However, there are instances where the reversing valve is off when running cool mode. A refrigerant reversing valve with an electromechanical solenoid coil is used to reverse refrigerant flow during unit operation (see Figure 10-14). Reversing Valve Position Selects “O” or “B” Setting For Heat Pumps Only O O B 2 Fn Circulating Fan OFF Off/10% – 100% (5% increments) Bad reversing valve – If you have a heat pump not heating, but it works in cooling mode, you might have a bad reversing valve. The energized state is typically achieved by applying 24 volts AC, which is commonly used in HVAC equipment. Maybe the fact that the reversing valve is energized to heat instead of cool is a clue that it's wired up wrong. In most cases, the reversing valve is energized when running cool mode. 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