Basically before heat pumps refrigerant flowed one direction. Wire it in and set the reversing valve to stay on cool cycle and never reverse to heat and viola. Therefore, it is important the check the manufacturer's specifications of the heat pump system that you are using before you can do a proper connection to the thermostat. Bad reversing valve – If you have a heat pump not heating, but it works in cooling mode, you might have a bad reversing valve. Refrigerant: The substance in the refrigeration lines that circulates through the indoor and outdoor unit. The energized state is typically achieved by applying 240 volts AC, which is commonly used in HVAC equipment. This is a job for your local Carrier expert. If the Reversing Valve is energized on a call for heating, what Terminal on the Sub-Base must be used? The energized state is typically achieved by applying 24 volts AC, which is commonly used in HVAC equipment. The heat pump can be designed by the manufacturer to produce either cooling or heating with the reversing valve … Because many heat pumps can lose efficiency as outdoor temperatures fall below freezing, your system probably has a supplemental heat source – either electric resistance heating elements, or a gas or oil furnace. The heat pump can be designed by the manufacturer to produce either cooling or heating with the reversing valve in the relaxed state. Slap a reversing valve on there and when it calls for heat the reversing valve gets energized and the flow is backwards. or cooling mode by changing the direction of the refrigerant between the indoor and outdoor coils. Condensing unit runs, but just won't push the gas back the other way. An electrical connection from the thermostat controls whether the reversing valve is energized or de-energized. i have got a chance to get a great deal on a armstrong a-coil and heat pump. Its easy to find out. If it was -20 outside, and your reversing valve failed, you will still have heat, you can survive (don't tell that to my customers) without a/c but you will die without heat in reality. 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. 0 = cooling reversing valve, energized in cooling mode. The main difference is that a heat pump can both heat and cool a home, whereas an air conditioner just cools a home. If I cut breaker of to unit you can hear valve coil click as it is de-energizing, or if you put unit in heating cycle you can hear valve click as it is de-energizing. The solenoid does not actually shift the main valve, it only shifts a much smaller pilot valve that then uses system pressure to shift the valve. Reversing valves can easily be configured for opposite operation. Cool Low Pressure Gas. If the reversing valve is energized during this test, ... the suction gases can absorb heat from the wayward hot gas bleeding across the valve diminishing the amount of sensible heat rise across the valve. Some units use energized reversing valve during cool and some de-energized. Figure 6. It will operate and blow heat like I've died and gone to hell, but it won't go the other direction and cool. A heat pump has a few extra parts that allow it to reverse the direction of heat exchange. Also, with the thermostat in "system off", no voltages except on the R and RH terminals. This valve is specialized for heat pumps, and when issues arise with the reversing valve in your heat pump, there will be operational issues. 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. This will energize the reversing valve to go into cooling. It needs another expansion valve, and it needs a reversing valve. It is generally soldered to the pipes or copper tubing, which are typically going in and out the device towards the other parts of the heat pump. im considering buying a armstrong heat pump to add to my existing gas only furnace to make it dual fuel. Your stat has no common. However, there are instances where the reversing valve is off when running cool mode. Maybe the fact that the reversing valve is energized to heat instead of cool is a clue that it's wired up wrong. This determines whether you are going to heat or going to cool. The selenoid energized.The other unit wired the same way working fine. Reversing valves: Change the flow of refrigerant which determines if your interior space is cooled or heated. heat so I could measure the voltage at the reversing valve and got 24 volts. On my newer CrapAir unit, it appears the reversing valve is stuck. A refrigerant reversing valve with an electromechanical solenoid coil is used to reverse refrigerant flow during unit operation (see Figure 10-14). Refrigerant is the chemical mixture that allows for the heat exchange to occur. (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.) Initialization The reversing valve solenoid is an electromagnetic coil that mounts onto the reversing valve and is generally 24V on residential heat pumps. REVERSING VALVE ENERGIZED IN COOL MODE ONLY REQUIRED FOR HEAT PUMPAPPLICAITON REVERSING VALVE ENERGIZED IN HEAT MODE Basic Installation Single Stage Thermostats 1E78-144 Non-Programmable 1E78-151 Programmable For additional information visit: www.white-rodgers.com Professionals can sometimes repair the reversing valve, put will often need to replace it. So you should be able to check the wiring at the air handler. Please check your heating and cooling system manual or consult a professional HVAC technician if you do not know which option to select. When the reversing valve is called upon to shift from the "down" position, the pilot solenoid valve is energized, closing its compressor discharge pressure port and connecting the chamber on top of the piston to the compressor suction line. 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. there should also be a setting in the menu telling it whether to energize reversing valve on heating or cooling. I just installed a new Ruud heat pumps a couple of weeks ago. 1) At the thermostat, remove the wire at the O/B terminal. 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