Make sure you are getting power to the valve solenoid coil in the AC mode by checking for volts. If not then it might be another control circuit issue like thermostat or control board in the heat pump that is a lot less expensive to fix. My crystal ball has been in the shop for several years awaiting parts. First check the electrical and mechanical aspects of the control mechanism. If the reversing valve is activated it will read volts, between the board and the O terminal.
Since it has 26v it is not energized.
Your system is one where the valve is energized in cooling and the heat mode is the default. I show the symptoms of a stuck reversing valve. This one is stuck partway and is bypassing from high side to low side. This video describes the construction, function, and possible failures that occur with heat pump reversing valves. It also covers typical system, electrical, and temperature touch tests used to.
The reversing valve is the component of a heat pump system that determines whether the system runs in heat or cool. They are in fact, an assembly of two valves: the main valve which actually directs the refrigerant flow in the system, and a pilot valve which controls the main valve. The mode in which the heat pump will operate is determined by which reversing valve tubes are piped to the inside and outside heat exchangers.
Heat pump reversing valve failures can be easily confused with compressor failures. So we have to talk about both aspects of heat pump troubleshooting. Once you finally figure out which component is causing the problem, then you have to replace them, which can be even worse. The heat pump reversing valve is the only difference between the heat pump and standard air conditioner. Previously we have talked about how a heat pump works.
We concluded it works just like an air conditioner, moving heat from one place to another. The way reversing valve are two valves in one, the nose valve which switches the refrigerant flow in the system. A pilot valve which controls the nose valve position threw systems pressures. The first step of diagnosing a stuck reversing valve involves checking the reversing valve solenoid or pilot valve, which should be energized when the heat pump is in heating mode or cooling mode, depending on the manufacturer.
Just as a refrigeration system removes and relocates heat from a cooler or freezer, so too does a heat pump remove heat from cold outdoor air and relocate it to within a building. A way reversing valve is used to swap the functions of the evaporator and condenser in order to change from cooling to heating mode. 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. The valve has two settings within it: one is excite the other is relaxed. HEAT PUMP REVERSING VALVE APPLICATION By: V. Training Emerson Electric Company Alco Controls Division Cooling Cycle.
Your heat pump has a part built into it called the reversing valve.
Check for a faulty reversing valve. This valve reverses the flow of refrigerant within your system. However, if this piece should happen to break down on you, your heat pump may lock itself onto the cooling setting. If you wanted to determined if the thermostat is sending a signal to the reversing valve , which terminal would you check for voltage? O Each of the following occurs in the reverse cycle heating mode of the heat pump , except?
It reverses the refrigerant flow to turn the refrigeration cycle from heating to cooling or the other way around. Heat Pump Sequence of Operation - Defrost and Backup Heating Methods. When the defrost cycle energizes, the reversing valve switches mode to the air-conditioning mode.
This switches the whole heat pump system into an air conditioner in the cooling mode. This is necessary to defrost the condenser coils. A bad reversing valve may be just the start of your heat pump troubles. The stress and strain placed on other components by a failed reversing valve could cause those parts to eventually break down and require replacement. The second part of the reversing valve assembly is a pressure operated slide valve.
The pilot solenoid valve directs refrigerant pressure to move the slide assembly in the valve body. The position of the slide valve directs system refrigerant flow to produce heat or cooling at the indoor coil. A heat pump which is low on refrigerant charge or has a stuck reversing valve can cause this problem.
Please make sure that you are getting volts to your reversing valve coil and that your reversing valve coil is good. If your reversing valve is stuck I would suggest that you check or have your heat pump system refrigerant charge checked. This solenoid-operated valve is a slide type design with a 4-way pilot valve and it operates under the full pressure of the heat pump system. Finally, the four-way “ reversing valve ” was develope and is in use today. In a heat pump , the compressor may be the heart of the system, but the reversing valve is the nerve center.
Two types of reversing valves were develope a poppet-type and a slide-type. DB FDD for a heat pump system. Decoupling features for check and reversing valve leakage 2. Development of check valve leakage feature In heat pumps, check valves are used to disable or enable expansion devices for heating and cooling modes.
A check valve can be either integrated as internal or external to the. Outdoor unit has been diagnosed with needing to replace the Suction Line Service Valve and refrigerant. Reversing Valve with Coil Used in Heat Pumps (Goodman Janitrol).
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