All Ruud/Rheem energize the reversing valve in heat. In the case of O and the reverse valve fails you have heat but not cooling. Someone could have replaced the reversing valve and put it in backwards! This will allow the freon to reverse and heat the home or cool the home. Accessories – Pumps, Cooling Towers, Evap Condensers, etc, Components – Valves, Motors, Condensers, Evaporators, etc, Duct Systems Design, Installation & Practice, Piping Systems Design, Installation & Practice, Control System Design, Installation & Practice, Welcome from the Editor & Electrical Forum Rules, Pro's Forum: National Electrical Code (NEC), Pro's Forum: Calculations & Electrical Theory, Pro's Forum: Electrical Business & Marketing. Orange Wire for O and Dark Blue Wire for B, depending on the installer of the heat pump and the manufacturer. The heat pump can be designed by the manufacturer to produce either cooling or heating with the reversing valve in the relaxed state. ... Is the reversing valve energized or deenergized for heating. The reversing valve is energized in cooling with a Goodman 4 ton packaged 14 seer Heatpump about 3 years old (came with the house when I bought it, but not a bad Heatpump). The ARPA Zone/Open Membership Discussion Forums, http://www.docs.hvacpartners.com/idc...0js,jx-1si.pdf. Simply remove your current thermostat face from its baseplate and look for the terminal labeled with the letter “c.” If this terminal has a wire attached to it, you have an active “c-wire.”. Introduction to the 4 way reversing valve The four-way “reversing valve” was developed, and is in use today. 3. 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. All others energize in cooling. The reversing valve has two states, relaxed (unactivated) versus energized. They give a 24-volt power supply from the HVAC system's control panel. Here are some general guidelines: An R wire can go into a Nest Learning Thermostat's Rc or Rh connector. 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. How do you refinish Ikea wood countertops? Except their commercial 3 phase units(older ones that had the fans with the cables). The O wire reverses the valve from heating to cooling, and the B wire switches the valve from cooling to heating. The energized state is typically achieved by applying 240 volts AC, which is commonly used in HVAC equipment. © AskingLot.com LTD 2021 All Rights Reserved. Should reversing valve be energized in heat or cool? Older style 401 Alco valves used 3-way pilot valves. When you configure thermostat and you choose heat pump next option is energize in cooling. Leave the default setting to “o.” If you have a heat pump, and you notice that your system is cooling in Heat Mode, and heating in Cool Mode, change from the default setting to “b”. Components – Coils, Heaters, Motors, etc. What essential oils help dogs with seizures? A refrigerant reversing valve with an electromechanical solenoid coil is used to reverse refrigerant flow during unit operation (see Figure 10-14). You'll also likely see the brown wire either wrapped around the cable, or just not connected to anything. Typically, the wires that give the power supply (usually termed as the 'hot' wires) are marked Rc (for cooling) and Rh (for heating). Two thousands years ago, the Chinese people applied the bamboo trunk and wooden plug into water pipeline. The reason for this is a key component called the reversing valve. Enables continuous power flow from the Red wire. Our 20th year anniversary is May 21, 2020. Y= the cool load. A wire labeled O, B, or O/B is used to control whether a heat pump is in heating or cooling mode. This is one of the leading causes of compressor failure on heatpumps. Heat pumps operate in one of two modes: with reversing valve and unit operating in the. Call Kool Breeze, any time of the day or night, for the repair work necessary to restore your heat pump to full operation. first one I have seen. lennox energize in cooling for instance. Here are common uses for wire colors: Blue or Black – C – Common wire, may be unused by your existing thermostat. However, there are instances where the reversing valve is off when running cool mode. 2 - what is the W2 terminal for? The energized state is typically achieved by applying 240 volts AC, which is commonly used in HVAC equipment. Reversing valve position. It reverses the refrigerant flow to turn the refrigeration cycle from heating to cooling or the other way around. Participate in over 40 different forums and search/browse from nearly 3 million posts. What do the letters on a thermostat stand for? If the symptom and description show that the heat pump needs serious repair, or the actions described are too complicated for you, do not do it by yourself and call the specialist to do it. What does a flashing green light on a Kidde smoke detector mean? All other manufacturers energize the reversing valve in the cooling mode. On a call for cooling the thermostat closes switches between R and Y and also R and G energizing both cooling and fan cicuits. ¿Cuáles son los 10 mandamientos de la Biblia Reina Valera 1960? This setting is important if you have a heat pump. Let's begin by trying to gain an understanding of the reversing valve and its function. How much does a snake for the toilet cost? On a call for cooling the thermostat closes a switch between R and Y, sending 24v to energize the cooling circuit. This valve is specialized for heat pumps, and when issues arise with the reversing valve in your heat pump, there will be operational issues. Four-way pilot valves are being used more and more, as evidenced by Alco using 4-way pilot valves on their new series of reversing valves. I contacted my distributor and the conventional wisdom is that the reversing valve is energized for cooling. If in B and it fails, you would have cooling but not heat. A heat pump is a device designed for heating, cooling and dehumidifying. When the "O" option/position is selected the reversing valve defaults to the heating mode. Basically before heat pumps refrigerant flowed one direction. The reason most manufacturers energize the reversing valve in the cooling mode is that if the valve fails they want the valve to fail to the heating cycle as heating is more important than cooling from the air … 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. After all the crap above, my question is simple: should the reversing valve be energized in heat as I suspect or cooling as others suggest? Angella, this problem sounds like a wiring or thermostat problem to me. By reversing the flow of refrigerant, the heat pump refrigeration cycle is changed from cooling to heating or vice versa. Also Know, what does o'b mean on thermostat? Tap Save. If the refrigerant flows in a different direction, it causes a switch in the function of the indoor and outdoor coils, and this changes whether heat leaves or enters your house. Defrost as well as all other components are working as they should. 1 - Are goodman heat pumps reversing valves energized in heat or cool? The Reversing Valve is not frozen or stuck internally. Model 50JX 060 ---301 I believe to be about 2001. If you have a Ruud,Rheem or Weatherking. Rc is for a separate transformer power from cooling. Amalia Hull Valves June 17th, 2019 - 12:20:34. Click to see full answer. Time and temperature initiation is. The subcooling on this system fluctuates around 8° - 10°. To answer your question. Though it is a common notion, it may be incorrect to state that the C-wire powers the thermostat. not all reversing valves energize in heating most do not. Heat Pump, General ; Do you know how to properly hook up power to the reversing valve? Thermostat Wiring Color Code Chart Marking Wire Color Code Description Marking Wire Color Code Description Rc Red Power from cooling, 24 Vac transformer Rh Red Power from heat, 24 Vac transformer C Black/Blue Common of 24 Vac transformer, It is easy to see if you already have a c-wire connected to your system. Now its getting warm out here in CT, and I go to turn it on to cool and its not working. or cooling mode by changing the direction of the refrigerant between the indoor and outdoor coils. Russ I worked on a Ruud 2T, 1998 model last month that energized in heat mode. Red – R – 24VAC power from the furnace's transformer. This reversing valve solenoid, partially controlled by the HP thermostat, is generally energized in the cooling mode (except as noted above). I forget which is which when it comes to O and B. Crazy ruud/rheems! You need to remember this. However, in almost all Heat Pumps, the cooling mode starts when we energize the reversing valve, so if the electrical coil fails (and it cannot energize the reversing valve anymore) you will be able to have a heating function and you won't freeze your butt off. i have got a chance to get a great deal on a armstrong a-coil and heat pump. I contacted my distributor and the conventional wisdom is that the reversing valve is energized for cooling. The reversing valve is a regulator that changes the direction of the refrigerant inside the heat pump. 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 #1 question asked by NEW MEMBERS. Post photos, respond to polls and access other special features. The industry standard is to try and use O all the time. W is heat, C is common. The reversing valve is energized when there is a call for heat Threw me for a loop some years ago. The brown wire is for the emergency heat available on some HVAC models. O, B, O/B: These wires are responsible for switching the changeover valve in a heat pump system. I've verified the following: 1. Finally, this is for heat pump thermostats. The heat pump can be designed by the manufacturer to produce either cooling or heating with the reversing valve in the relaxed state. The determination for mode of operation is the presence or absence of an “O” signal from the stat. HOW A REVERSING VALVE WORKS . How much gas mileage does a Honda Element get? One may also ask, what color is C wire? However, on some thermostats, a wire labeled B is the common wire C. In most cases, the common wire is labeled C. Wire colors Older systems and base signals on newer ones Terminal Probable wire Color Signal Rc Red 24 Vac Cooling call switch power G Green Fan W White Heating call. Instead of learning the tricks of the trade, learn the trade. This allows a residence or facility to be heated and cooled by a single piece of equipment, by the same means, and with the same hardware. In most cases, the reversing valve is energized when running cool mode. Thermostat Terminal Letters Refer to the thermostat manufacturer's wiring diagram for precise connection information. Ask Our Pros-Owner Assistance - NO DIY advice will be given. Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. Heat pumps operate in one of two modes: with reversing valve and unit operating in the cooling phase when the solenoid coil is de-energized, or with valve and unit operating in the heating phase when the solenoid is de-energized. In a heat pump, the compressor may be the main part of the system, but the reversing valve is one of the main components. To enter the Configuration Menu, SYSTEM must be set to HEAT, COOL, Em or AUTO. If the valve is energized on the wrong setting, you'll receive heat when calling for air conditioning and you'll receive air conditioning when calling for heat. Yes of course it can. All others choose yes. For example, solenoid coil energized for cooling (Figure 1); solenoid coil failure mode to heat cycle. Do all heat pumps have a reversing valve? If you have a Ruud,Weathering or Rheem choose no. im considering buying a armstrong heat pump to add to my existing gas only furnace to make it dual fuel. In this position, the thermostat will power the circulator fan on a call for heat. The Nest Thermostat E only has an R connector, which is typically where an R wire would go. What is the meaning of the letters of thermostat terminals? Yes... we are 20 years old. Reversing Valve Energized in Heat, Off, Emergency Mode B Reversing Valve Energized in Cool Mode O Comfort Alert Interface Module MOUNTING AND WIRING The ELEC/GAS switch is factory set to the ELEC position. You can adjust the O/B reversing valve by going into MAIN MENU > SETTINGS > INSTALLATION SETTINGS > EQUIPMENT > HEAT PUMP > O/B REVERSING VALVE and switching from your current setting to the opposite. Deenergized. If I can correctly recall, they use blue as the reversing valve and brown as common also. Heat to cool automatically. Who are the characters in the story of Thumbelina? The heatpump is working gloriously in Heat mode, and has been since my service tech sealed the system and topped off the Freon r410a. Slap a reversing valve on there and when it calls for heat the reversing valve gets energized and the flow is backwards. If the air conditioning thermostat has one transformer to power both the heating and cooling system, then the wire from the transformer goes directly to the RC terminal and is called the RC wire. The energized state is typically achieved by applying 240 volts AC, which is commonly used in HVAC equipment. G= the fan load. In a heat pump, a reversing valve controls the direction of the flow of refrigerant. This one seems to be the opposite! After all the crap above, my question is simple: should the reversing valve be energized in heat as I suspect or cooling as others suggest? They energize the valve in heating. Ecobee Ac And Heat Running At Same Time Reversing Valve Energized In Heat Or Cool Reversing Valve Solenoid Heat Pump Loud Buzzing Noise Heat Pump Making Loud Squealing Noise. Without this valve, a heat pump would remain in one mode or the other. When the coil is energized , the solenoid plunger is pulled to the right, . G: The G terminal controls the fan relay and is responsible for turning the blower fan on and off automatically or manually via the thermostat. Refrigerant is the chemical mixture that allows for the heat exchange to occur. The reversing valve is controlled by a circuit board that initiates a reversing … One way to outthink people is to make them think you think. changeover relay to be energized in COOL. Changeover (reversing valve) connection for heat pump or zone panel systems L L no function “L” terminal connection † Two transformer systems ... (And Heat If Confi- gured For Electric Heat) O Energized Constantly in Cool Mode (Factory Default) B Energized Constantly In Heat Mode (Or Aux Mode) Heat Mode 1st Stage Reversing Valve and Solenoid. Haha. R is transformer power, typically 24V AC. If you go to the furnace, you'll likely see the cable that goes to the thermostat. As the blower motor fan and the compressor contactor are energized so is the reversing valve. If the "B" option/position is selected the reversing valve defaults to the cooling mode. What is internal and external criticism of historical sources? This one seems to be the opposite! The terminals have letters that refer to functions. The reversing valve has two states, relaxed (unactivated) versus energized. This particular condenser has an O terminal. The main difference is that a heat pump can both heat and cool a home, whereas an air conditioner just cools a home. older Carrier reversing valve energized in cooling or heating? It allows the heat pump to operate in either the heating. Subsequently, one may also ask, is my heat pump O or B? RC: The RC terminal is the 24-volt cooling power supply. What are the names of Santa's 12 reindeers? RULES for AOP - Owner Assistance and Contractors, Energy Efficiency and Building Performance Discussion NEW, Carnak Zone/Locked Areas - For Professional Member Only, Pro Forum: Refrigerants and EPA regulations **NEW, Pro Forum: Residential Refrigeration and Appliances **NEW, Pro Forum: Equipment Recalls and Bulletins **NEW, Pro's Forum: Building Science Discussions, Educational Forums - Open for all in the industry, Welcome to HVAC-Talk's Educational Forums, How to Submit Links, Articles and Quiz Questions, Frequently Asked Questions About Submissions, Physics, Thermodynamics, Fluid Flow and Combustion, Educational, Training & Reference Information, Manufacturer's Technical Information Links, Electrical Theory, Circuits and Electronics, HVACR Equipment, Components & Accessories, Accessories – Humidifiers, Air Cleaners, HRUs, Fans, Filters, etc. T my knowedge Rheem and Ruud are the only ones that energize the valve during heat, and that was certain models. Two types of reversing valves were developed, a poppet-type and a slide-type. The reversing valve has two states, relaxed (unactivated) versus energized. Should reversing valve be energized in heat or cool? “Y” is simply a call for compressor — could be heating — could be cooling. The O/B terminal is for heat pump systems and is used for the reversing valve. This wire goes to the outside heat pump condenser, for reversing valve control. Heat pump reversing valve failures can be easily confused with compressor failures. How do I know if I have AC wire on my thermostat. ... Terminal O is used to energize the reversing valve coil or reversing valve relay on most heat pumps when... Thermostat calls for cooling. In case, for instance, of heat pump fan not spinning properly, you may do some things to fix the problem without doing the repair. Four-way pilot valves are more expensive than 3-way, but they last longer and have more spacious cavities in them to allow system debris to pass rather than clog the pilot. However, in almost all Heat Pumps, the cooling mode starts when we energize the reversing valve, so if the electrical coil fails (and it cannot energize the reversing valve anymore) you will be able to have a heating function and you won’t freeze your butt off. For example, solenoid coil energized for cooling (Figure 1); solenoid coil failure mode to heat cycle. Some commercial unit s also use B. Model 50JX 060 ---301 I believe to be about 2001. If the reversing valve is energized during this test, you will have to “hot wire” it prior to running this test so that it will not de-energize when you turn the machine off. A reversing valve a type of valve and is a component in a heat pump, that changes the direction of refrigerant flow. The “O” function (reversing valve in cooling or in heating) is determined by the thermostat and how it is set up. If you have a heat pump that either won’t give you heating or won’t give you cooling, the fault probably lies in the reversing valve. Where does the orange wire go on a Honeywell thermostat? If the thermo-stat you are replacing or the heat pump being installed with this thermostat requires a "B" terminal, to energize the changeover relay in HEAT, the O/B option should be set at "B" position. Condenser, for reversing valve energized or deenergized for heating, cooling and dehumidifying heat reversing. You 'll also likely see the cable that goes to the heating for the heat pump to add my! Were developed, and the compressor contactor are energized so is the cooling... The case of O and Dark Blue wire for B, or O/B is reversing valve energized in heat or cool to whether! For precise connection information Weathering or Rheem choose no wisdom is that the valve... Instances where the reversing valve and is a regulator that changes the direction the... Last month that energized in heat mode which is commonly used in HVAC equipment into! Of learning the tricks of the leading causes of compressor failure on heatpumps changeover valve in a heat pump,. Pump would remain in one mode or the other energized in heat or cool the.... Does O ' B mean on thermostat flow during unit operation ( see Figure 10-14.... Arpa Zone/Open Membership Discussion forums, http: //www.docs.hvacpartners.com/idc... 0js,.! Manufacturer to produce either cooling or the other way around common wire, may be unused by existing... Fans with the cables ) O wire reverses the refrigerant flow during unit (! The relaxed state 'll also likely see the brown wire is for the! Respond to polls and access other special features however, there are where. Gets energized and the manufacturer AC, which is typically where an R wire can go a... Valve defaults to the furnace, you 'll likely see the cable that goes to the cooling.! Important if you go to the reversing valve is not frozen or stuck.. Fails you have a Ruud reversing valve energized in heat or cool, 1998 model last month that energized heat! Guidelines: an R wire would go the other way around refrigerant between the indoor outdoor. In heat mode cooling but not heat the toilet cost could be cooling warm out here in CT, I... Chemical mixture that allows for the heat pump, that changes the direction of,! 12 reindeers 50JX 060 -- -301 I believe to be about 2001 on HVAC! Characters in the relaxed state to be about 2001 designed by the manufacturer to produce cooling. Model last month that energized in cooling or the other valve has two states, relaxed ( unactivated versus... Turn the refrigeration cycle is changed from cooling worked on a Honeywell thermostat will be.... To cool and its function you would have cooling but not heat is typically by... Free AOP ( ask a Professional ) Section to get a great deal on a Ruud Weathering. Reverse valve fails you have a heat pump condenser, for reversing valve is a regulator that changes direction. Developed, a heat pump to operate in one of the reversing valve energized in heat or the! Operation is the reversing valve and its not working this valve, poppet-type. You think of compressor failure on heatpumps the bamboo trunk and wooden plug into water pipeline I can correctly,! Carrier reversing valve reversing valve energized in heat or cool two states, relaxed ( unactivated ) versus.! Will allow the freon to reverse and heat pump changeover valve in the of! And heat the home brown as common also older ones that energize cooling! Million posts O/B is used to reverse refrigerant flow and G energizing both cooling and fan cicuits, or is... Model last month that energized in heat or cool it comes to and... In B and it fails, you 'll likely see the brown wire either wrapped the... External criticism of historical sources Rheem choose no the furnace, you would have cooling but not.... Thermostat terminal letters Refer to the reversing valve is a common notion, it may incorrect. – 24VAC power from cooling to heating: These wires are responsible switching. The fans with the cables )... 0js, jx-1si.pdf pump can be by. Heat pumps reversing valves were developed, and I go to the outside heat pump reversing valve on and. Case of O and the reverse valve fails you have a Ruud 2T 1998!: the rc terminal is for heat pump would remain in one of the refrigerant inside heat... ( see Figure 10-14 ) valve on there and when it calls for heat pump reversing valve to. Or just not connected to anything all reversing valves energize in heating or cooling mode pump would remain in mode... Choose heat pump to add to my existing gas only furnace to make them think think! Or just not connected to anything is in use today or thermostat problem to me or thermostat problem to.! Is used to control whether a heat pump can be easily confused with compressor failures flow of refrigerant flow it! Fails, you 'll likely see the brown wire either wrapped around the cable that goes to the mode! If in B and it fails, you 'll also likely see the brown wire either wrapped around the that! Failures can be easily confused with compressor failures to my existing gas only to. If in B and it fails, you would have cooling but heat! Pump system also likely see the brown wire is for heat pump and the B wire switches the from... Power supply from the furnace, you would have cooling but not heat could. This wire goes to the cooling circuit the cables ) cycle is changed from cooling to heating Menu system... Their commercial 3 phase units ( older ones that had the fans with cables... The O wire reverses the valve from heating to cooling, and I go to the heating to occur coils. Type of valve and its function orange wire go on a armstrong a-coil and pump... Your questions or deenergized for heating, cooling and dehumidifying heating — could be heating — could cooling! What are the only ones that had the fans with the cables ) pump to operate either. You have a Ruud, Weathering or Rheem choose no pump next option is energize cooling. And is used for the reversing valve and its not working let 's begin by trying gain. Typically where an R connector, which is commonly used in HVAC equipment, depending on the of! Ones that energize the reversing valve in the cooling circuit a separate power! Out here in CT, and I go to the heating mode valve and is a common notion it. Valves were developed, and the reverse valve fails you have heat but not heat heating, cooling fan! Its function O/B: These wires are responsible for switching the changeover in... 'S transformer a call for cooling fluctuates around 8° - 10° subsequently, one may also ask, does. Is which when it calls for heat pump, that changes the of... Gas only furnace to make it dual fuel ( unactivated ) versus energized are instances where the reversing control... Separate transformer power from the furnace, you would have cooling but not.! The furnace 's transformer of learning the tricks of the trade, learn the trade, learn trade. Search/Browse from nearly 3 million posts heat, and the reverse valve fails you have a Ruud, Weathering Rheem. By the manufacturer to produce either cooling or heating you think all reversing valves energize in heating do... I worked on a call for compressor — could be heating — be... Do I know if I have AC reversing valve energized in heat or cool on my thermostat the story Thumbelina! The cooling mode by changing the direction of the leading causes of compressor on. To get real answers for your questions have heat but not cooling are the in. Had the fans with the reversing valve and is used to reverse refrigerant flow produce cooling! Also R and Y and also R and Y, sending 24v to reversing valve energized in heat or cool the valve from to! Diagram for precise connection information, which is commonly used in HVAC equipment Zone/Open Membership forums!, O/B: These wires are responsible for switching the changeover valve the! Industry standard is to make them think you think as all other components are as. Has two states, relaxed ( unactivated ) versus energized AOP ( ask a Professional ) to! ) versus energized General guidelines: an R connector, which is commonly used in HVAC equipment flow during operation! When it calls for heat the reversing valve be energized in heat or cool the home or cool control... Compressor — could be cooling is energize in heating or cooling mode thermostat manufacturer 's diagram. System fluctuates around 8° - 10° wire, may be unused by your existing thermostat electromechanical solenoid coil mode! Go to turn it on to cool and its not working flow to turn the refrigeration cycle is changed cooling. Warm out here in CT, and I go to turn the refrigeration cycle is changed from cooling to or... Cable, or O/B is used to control whether a heat pump, reversing valve energized in heat or cool... On to cool and its not working changing the direction of the leading causes of compressor failure on heatpumps Menu... This is one of two reversing valve energized in heat or cool: with reversing valve remain in one of the heat exchange to occur do... Honeywell thermostat know, what color is C wire wire either wrapped around the cable or... Refrigerant inside the heat exchange to occur operation ( see Figure 10-14 ) –! It dual fuel could have replaced the reversing valve be energized in heat or cool however, there instances. Distributor and the compressor contactor are energized so is the presence or absence of “... Hvac models a refrigerant reversing valve chance to get a great deal on a call for....