If the Reversing Valve is energized on a call for heating, what Terminal on the Sub-Base must be used? Voltages is ~24v ac. not all reversing valves energize in heating most do not. Wire it in and set the reversing valve to stay on cool cycle and never reverse to heat and viola. 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. The reversing valve is powered in AC mode. With the reversing valve de-energized the flow reverses. The selenoid energized.The other unit wired the same way working fine. 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. Bad reversing valve – If you have a heat pump not heating, but it works in cooling mode, you might have a bad reversing valve. This is a job for your local Carrier expert. 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. It works fine in cooling. Slap a reversing valve on there and when it calls for heat the reversing valve gets energized and the flow is backwards. 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. An electrical connection from the thermostat controls whether the reversing valve is energized or de-energized. A refrigerant reversing valve with an electromechanical solenoid coil is used to reverse refrigerant flow during unit operation (see Figure 10-14). The blue on the reversing valve should be common or C and the orange should go to the O terminal of the thermostat. Welcome to the forums. or cooling mode by changing the direction of the refrigerant between the indoor and outdoor coils. there should also be a setting in the menu telling it whether to energize reversing valve on heating or cooling. The reason for this is a key component called the reversing valve. The reversing valve is energized when there is a call for heat Condensing unit runs, but just won't push the gas back the other way. When the heat pump switches between its heating and cooling modes, it’s the change in the reversing valve that makes it happen. Please check your heating and cooling system manual or consult a professional HVAC technician if you do not know which option to select. 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. 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. Its easy to find out. Your stat has no common. It will operate and blow heat like I've died and gone to hell, but it won't go the other direction and cool. Either your system uses O or B, not both. 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. A wire (usually orange wired to “O” terminal on the heat pump thermostat) runs from the thermostat to the condenser, where the typical air to air heat pump has a reversing valve. The energized state is typically achieved by applying 240 volts AC, which is commonly used in HVAC equipment. For example, solenoid coil energized for cooling (Figure 1); solenoid coil failure mode to heat cycle. It needs another expansion valve, and it needs a reversing valve. Will create a dead short when you turn the heat on. The reversing valve solenoid is an electromagnetic coil that mounts onto the reversing valve and is generally 24V on residential heat pumps. Maybe the fact that the reversing valve is energized to heat instead of cool is a clue that it's wired up wrong. The energized state is typically achieved by applying 24 volts AC, which is commonly used in HVAC equipment. Initialization The determination for mode of operation is the presence or absence of an “O” signal from the stat. Reversing Valve and Solenoid. I tried everything. 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. 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. 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 reversing valve solenoid, partially controlled by the HP thermostat, is generally energized in the cooling mode (except as noted above). 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. 99% of heat pumps I have seen are energized for cooling and are designed to fail heat. Some units use energized reversing valve during cool and some de-energized. 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. Coils: The condenser and evaporating coil heat or cool the air depending on the directional flow of refrigerant. (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.) 0 = cooling reversing valve, energized in cooling mode. This determines whether you are going to heat or going to cool. The reversing valve has two states, relaxed (unactivated) versus energized. The reversing valve is energized for cool mode, de energized during heat pump mode operation. Start studying Reversing Valve 4 Way- Valve Heat Pumps. I intentionally turned the Tstat up high enough to turn on the aux. However, there are instances where the reversing valve is off when running cool mode. On my newer CrapAir unit, it appears the reversing valve is stuck. ... My Coleman 3700 THE 2.5 ton heat pump /ac will not switch to the cool mode. This valve is specialized for heat pumps, and when issues arise with the reversing valve in your heat pump, there will be operational issues. This seats the piston so refrigerant must pass through the orifice. Works fine in emergency heat. Shown here, the heat pump cooling works like any cooling system when it is in cooling mode. B on the stat is reversing valve energized in heating mode. When looking at a reversing valve, the single port on the bottom is always the discharge line from the compressor. Figure 6. This is called the 4-Way Reversing Valve, because it has four connections refrigerant pipes.Because the heat pump uses of reversible mechanical refrigeration cycle, such device is not required. 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. The reversing valve. In a heat pump, a reversing valve controls the direction of the flow of refrigerant. If the valve breaks, the heat pump will be trapped in one mode or the other. Professionals can sometimes repair the reversing valve, put will often need to replace it. A reversing valve is usually found close to the compressor or condenser of the heat pump. I just installed a new Ruud heat pumps a couple of weeks ago. Cool Low Pressure Gas. The heat pump can be designed by the manufacturer to produce either cooling or heating with the reversing valve in the relaxed state. 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) The main difference is that a heat pump can both heat and cool a home, whereas an air conditioner just cools a home. Reversing valves: Change the flow of refrigerant which determines if your interior space is cooled or heated. 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 Video of a confirmed diagnosis of a 3-way reversing valve not cooling but heating ok. i have got a chance to get a great deal on a armstrong a-coil and heat pump. 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. Refrigerant: The substance in the refrigeration lines that circulates through the indoor and outdoor unit. In most cases, the reversing valve is energized when running cool mode. It allows the heat pump to operate in either the heating. Refrigerant is the chemical mixture that allows for the heat exchange to occur. heat so I could measure the voltage at the reversing valve and got 24 volts. I have 2 units (0ne works well)and it appears that the switching valve is not operating. lennox energize in cooling for instance. A heat pump has a few extra parts that allow it to reverse the direction of heat exchange. selenoid the reversing valve goes into heat. 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. A broken reversing valve will mean a heat pump that is trapped in one mode or the other. But when calling for normal heat, it goes into the cooling cycle. This will energize the reversing valve to go into cooling. The reversing valve has two states, relaxed (unactivated) versus energized. 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