First off, this means you have a heat pump (more on that in a moment). Auxillary Heat implies that you have an Air Source Heat Pump. Fuel for the FFBH is taken from the vehicle fuel tank, through a fuel line attached to the fuel pump module. Selectable from 0° to 40°F or off*. Join Date: Dec 2014. So I would like to set the heat pump not to run below, say, 20 degrees and just use the aux. Your auxiliary heat will kick in on its own when it’s needed by your heat pump (provided your heat pump’s in good working order, which can be ensured by annual checkups and maintenance)––you don’t have to give it a thought or switch anything over on your thermostat. Please Note: if OAT is less than Auxiliary Heat Lockout temperature setpoint the auxiliary heat may engage e. Each test wil l run for a maximum of 60 minutes or until manually terminated : f. Wait at least 10 minutes before taking static pressure readings and inserting flow plate for TrueFlow plate test. I am hoping to get more low temperature use out of my heat pump so as to use the heat strips as little as possible. If ice starts to build on your heat pump’s outdoor unit, your heat pump will undergo a “defrost cycle” to melt it. Most heat pumps are designed to automatically switch to AUX heat when the indoor temperature is 3 degrees colder than the thermostat setting. As we mentioned above, heat pumps absorb heat from the outdoor air and then move that heat indoors. In many situations, it’s a combination of both. Auxiliary heat refers to your heat pump’s backup electric resistance heating. Note: Normal programmable thermostats have one way to control AUX heat: the AUX lockout temperature. Auxiliary heat can handle more extreme temperatures since it uses electric heat strips. See Dual Fuel Heat Pump control on page 22. Auxilliary heat lockout? If your heat pump seems to be stuck on auxiliary heat mode and the temperatures outside are above 35 degrees, you should call the professionals at Precision Heating & Air. My question is, is there a way around this to actually set the lockout temperature? For heatpump systems, its also crucial to know and set the minimum outdoor temperature that the heat pump can run with - otherwise the thermostat will lock out the heatpump and change over to aux heat as the weather outside will be too cold to run the heatpump unit that's sitting outside. And, because a heat pump stops heating your home during this process, some models will automatically switch to AUX mode until the defrost cycle is over. HOWEVER, as we also mentioned above, electrical resistance heating (AUX heat) is more expensive than heat transfer. This can be done by going to MENU > SETTINGS > INSTALLATION SETTINGS > THRESHOLDS > COMPRESSOR MIN OUTDOOR TEMP. “0” means that the auxiliary heat lockout is disabled. This is typically caused by one of three factors: when it’s below 35° outside, you’re trying to heat your home by 3° or more, or your heat pump is in defrost mode. Please Note: if OAT is less than Auxiliary Heat Lockout temperature setpoint the auxiliary heat may engage e. Each test wil l run for a maximum of 60 minutes or until manually terminated : f. Wait at least 10 minutes before taking static pressure readings and inserting flow plate for TrueFlow plate When that happens, the heat pump will reverse the flow of refrigerant so that hot refrigerant is sent to the outdoor unit (to melt the ice). Aux heat should only kick on when the heat pump can’t produce enough heat to warm your home on its own. However, when your heat pump is unable to meet demand via heat transfer, it will tap into its backup heating, or “AUX” heat. A skilled tech will be able to determine what the issue is and fix it before you continue to spend money on high energy bills. Up to 3H/2C Heat Pump systems or up to 2H/2C Conventional systems. Why does my nest say aux heat? With Heat Pump Balance, you don't have to worry about the AUX lockout temperature. If it gets colder outside than the set lockout temperature, your heat pump will use AUX heat. Here’s how it works. I live in Pittsburgh Pa. temps are getting to be around 14 degrees with colder wind chill factors...earlier this yr with the help of 2-3 folks on this forum I purchased a 3.5 trane heat pump and airhandler and also a tcont800 series touch screen thermostat I think everything went well. So first, check to see if your thermostat only says AUX when you raise the thermostat 3 degrees or higher than the current temperature of your home. In these cases you can manually enter a higher differential to avoid the auxiliary heat coming on for a certain time or temperature difference (it is up to you what value you would like to keep it at). But don’t worry—it’s usually normal. Now this 'COMP TO AUX DELTA' option is asking for how many degrees the indoor temperature should drop before using the auxiliary heat. Get in touch with our support team. And when outdoor temperatures drop too low, there’s simply not enough heat in the outdoor air to keep your home warm. Auxiliary heating is provided by a Fuel Fired Booster Heater (FFBH), which boosts the temperature of the coolant supplied to the heater from the engine. There isn’t enough heat getting to the heat pump. The thermostat shall have a compressor outdoor lockout and bac kup heat outdoor lockout to turn off the heat pump or backup heat based on outdoor temperature. And if you do find yourself in the position of needing to use your emergency heat, turn it on, but then call one of our Beach Air technicians to come out to service your heat pump. Note: In some cases, your heat pump’s AUX heat could be a gas furnace, but since Phoenix typically has mild winters, some AZ homeowners will have electric resistance as their AUX heat. Temperature management is one of the key challenges of the game. Now I keep on getting alerts that the Aux heat is running. There are two main reasons as to why this may happen. Most of today’s thermostats are programmable and allow you to set a schedule to match your preference. On my system, they are set as follows: Option 08 = Of Option 09 = 45. Nest 3rd gen model will turn ON the aux heat system only when it is necessary (only when the outside temperature falls below the aux heat lockout temperature). OF (off) -- function is disabled. PTCS Heat Pump Thermostat Support Sheet . 346. I would recommend to set a value for these thresholds first and that should eliminate the aux heat turning on sooner than needed.This can be done by going to MENU > SETTINGS > INSTALLATION SETTINGS > THRESHOLDS > COMP TO AUX DELTA. It becomes necessary once the temperature drops below a certain point. The TH8321 Thermostats provide temperature control for gas, EM heat is an option on your thermostat that you can manually turn on to activate backup heating. iii Glossary of Terms Auto-Changeover: A mode in which the thermostat will turn on the heating or cooling based on room temperature demand. Auxiliary heat can also be prevented from operating above an installer selected outdoor air temperature. If you use the lowest setting, chances are your AUX heat won’t kick in anymore and the notification will be gone. Auxiliary heat lockout with outdoor sensor or Internet weather. The auxiliary heat would kick in at this point to help maintain the temperature in the space. Signs that your heat pump is in defrost mode include: If you are not experiencing one of the 3 situations listed above but your heat pump is running on AUX heat, your heat pump likely needs a professional repair. To be safe, disable the Aux Lockout if you go away. My best advice is to find another tech. Secondly, it means the outdoor temperature is too cold, so your heat pump is using “backup” heat to heat your home. This way, the aux heat can engage if you have a system lockout, and keep the house from freezing. This applies to a heat pump with electric back up heat. Model TH6220WF2006: Up to 2H/1C Heat Pump systems or up to 2H/2C Conventional systems. Auxiliary heat is allowed to operate whenever sufficient demand for heat is available. The two different names refer to the same thing: an electric heating system So you were wondering, at what temperature is a heat pump not effective? With heat pumps, it's best to set the temp you want and leave it alone. George Brazil Air Conditioning and Heating provides the Phoenix area with, usually costs up to 50% more than heat transfer, How your heat pump works (AUX heat vs. “normal” heat), When it’s okay for your heat pump’s AUX heat to be on, What do do if your AUX heat is on and shouldn’t be, Steam and/or water coming from the outdoor unit, The fan in the outdoor unit has stopped running, A blinking light on the unit to indicate it’s in defrost mode (only on some heat pump models). I would like to change my heat pump balance point so that the heat pump isn't used once the outside temperature drops below above 40F. Note: Normal programmable thermostats have one way to control AUX heat: the AUX lockout temperature. This is set at a default 35F (1.7C), so the heatpump will not be used when the weather outside is below 35 degrees Fahrenheit and only aux heat will be used in this case. COMPRESSOR LOCKOUT Below the selected temperature the compressor does not operate, except in defrost cycle. Dual fuel and aux heat lockout with outdoor sensor or Internet weather. The thermostat shall have a compressor outdoor lockout and backup heat outdoor lockout to turn off the heat pump or backup heat based on outdoor temperature. Because the temperature rise is more than 3 degrees (it’s 6 degrees in this scenario), the system will automatically turn on the AUX heat to help your home meet the desired temperature faster. For example, if your AUX lockout temp is 40ºF or 4.4ºC, then AUX heat will come on when the outdoor temperature drops below 40ºF or 4.4ºC. We have a heat pump and recently installed an ecobee thermostat. It does seem to be kicking in frequently instead of normal heat and got an alert that my "Aux Heat was running for more than 180 minutes". Some heatpumps can take longer than others to warm up and finally start giving heat. Balance point/auxiliary heat lockout plus 2° droop. d. This function allows the furnace to run independently of the outdoor unit and overrides the auxiliary heat lockout function until a technician can resolve the problem. If your AUX lockout temp is 40°F/4.4°C, then auxiliary heat will come on when the outdoor air temperature drops below 40°F/4.4°C. Please Note: if OAT is less thanAuxiliary Heat Lockout temperature setpoint the auxiliary heat may engage. The heat pump lockout temperature can be used to force a switch from heat pump operation to auxiliary heating. An auxiliary fuel pump supplies the fuel at low pressure to the FFBH. Auto Fan System MCR29409 Auxiliary Heat On Heat Setting Inside72 72 Replace Battery Auto Fan Heat System MCR29406 Heat: Heating system control. • Displaying the remote/outdoor temperature on the LCD • Using the remote/outdoor temperature to lockout the compressor or auxiliary heat • Using the remote/outdoor temperature instead of the built-in sensor Scheduling function with two or four periods per day and the following day/week options: Our suggestion would be to reach out to a professional as soon as possible. Below, we’ll look at the situations in which your heat pump is unable to heat your home via heat transfer (and may need to use AUX heat). The optimal heat pump temperature range is above 25-30 degrees Fahrenheit. Most heat pumps are designed to automatically switch to AUX heat when the indoor temperature is 3 degrees colder than the thermostat setting. When the heat pump can no longer maintain the desired temperature setting, then the auxiliary heat must come on to assist. The Emergency Heat setting should only be used when the outdoor unit of your heat pump system is not working properly. Although this situation is rare in Arizona, it’s common in colder parts of the country. The environment can get warmer through items that produce heat, creeps through walls and resources, even your Duplicants produce and spread some heat by mere existence. Similarly Chilliness can spread by air … The ecobee will run the second stage of your aux heat if the current temperature is greater than the value designated in the Aux Heat Stage 2 Temperature Delta setting. As the temperature drops two to three degrees below the set temperature, many systems will signal for the auxiliary heat to come on. Just contact us and we’ll send one of our Phoenix techs right over. The TH8320 Thermostats provide temperature control for gas, oil, electric and heat pumps for up to 3 heat, 2 cool systems including dual fuel operation. Heat pumps work most efficiently when maintaining a temperature. Pssttt...if you live in Phoenix or surrounding areas, we can help you determine what’s wrong with your heat pump and fix it. In most cases, lockout temperature is 40ºF. Upvote #2 12-09-14, 01:54 PM K. ksefan. There is a setting in your "thresholds" section that you can change; most likely it is set to default at the moment which relies on the feedback of your heatpump system and how long it takes to warm up the home. EM heat is NOT the same thing as AUX heat: AUX heat signifies that your heat pump has automatically switched over to backup heating because temperatures are too low. As we mentioned above, most heat pump systems are designed to switch to AUX heat when the indoor temperature is 3 degrees colder than the thermostat setting. The Lockout temperature is set lower than usual but not to the lowest setting. The thermostat is set to 70 degrees. Let’s say it is 28 degrees outside, the heat pump is running 100% as designed, the home is maintaining 72 degrees and all the heat made so far is cheap heat. 35), the compressor is locked-out and ONLY the auxiliary will run when the outdoor temp drops below the specified temp. Option 9 (Heat Pump Lockout): Set at Of(f), the compressor (heat pump) will always run (with the auxiliary) no matter how low is the outdoor temp. If you use the lowest setting, chances are your AUX heat won’t kick in anymore and the notification will be gone. For example, with an auxiliary heat lockout of 40F, only the compressor will run above that temperature. With Heat Pump Balance, you don't have to worry about the AUX lockout temperature. ...The temperature outside is below 35° Usually, once outdoor temperatures fall below 35°, a heat pump will struggle to keep your home warm and will automatically switch to AUX heat. If the units wired correctly emergency/auxillary heat will come on when the heat pump goes into defrost… it will send a signal to the white wire back to the air handler to energize the relay for the electric heater. 5 years ago. However the only option I seem to have is to run the heat pump "Always", and according to Nest support that can't be changed. Many homeowner misuse this setting more than any other. REVERSING VALVE SHIFT DELAY Limit excessive noise in and out of a defrost cycle. Generally, heat pumps work by transferring outside heat into your home via a process called heat transfer. Emergency Heat. What does aux heat mean on a Honeywell system? If you’ve been running your heat pump in heat mode and you’ve noticed that your thermostat is reading “AUX heat,” you’re probably wondering: AUX heat refers to your heat pump’s “backup” electric resistance heating. The reason for this is that a heat pump does a very good job of maintaining temperature, but is very poor at recovering temperature. When outdoor temperatures reach freezing temperatures, the outdoor coils can begin to freeze over with ice. This 3-degree “trigger point” is programmed into the thermostat by the manufacturer. What this means, unfortunately, is that it’s more expensive than the conventional heat provided by a heat pump. The heat pump mode is operating but can not keep up. As we mentioned above, heat pumps absorb heat from the outdoor air and then move that heat indoors. Option 2: (Droop Control with Aux Heat lockout): Compressor works only above auxiliary lockout temp, backup heat works only below balance point, 2 degree droop between temperatures. Contrôleur CVCA et capteurs de température Références de modèle LRF2-TWRB-XX* Capteur de température sans fil LR-TEMP-FLSH** Capteur filaire encastré Kits : LR-HVAC-PKG-WH Le système comprend : –1 contrôleur CVCA** –1 boîtier d’affichage mural seeTempT (°F) (WH) –1 capteur de température sans fil (SW) –1 capteur filaire de retour d’air LR-HVAC-PKG-C-WH Le système compr We know you have questions, so below we’ll go into more detail about: First, let’s take a closer look at how your heat pump works. The auxiliary heat comes on when it is 1.5 degrees cooler in the house than the thermostat set point. Most heat pump thermostats bring on the back up heat when the temperature difference between the room and that thermostat setting is 3 degrees or more. For example, let’s say that you wake up to a cold home (62° F) and immediately raise the thermostat to 68°. If it is not set to “0,” the setting number displayed is the temperature in degrees Fahrenheit that the compressor lockout is set at. The idea of heat pump control is to use the most economical heat source first, and the auxiliary heat source, usually electric resistance heat, only when the heat pump can’t handle the load. Do not switch to emergency heat when the outdoor temperatures dip below 35ºF––your auxiliary heat will automatically step up to supplement your heat pump. Selectable 0, 12 … Hopefully this article has helped answer that question, and any others about heat pump temperature ranges, and what you can do to improve heat pump performance when it gets below 25-30 degrees. And if not, what's my best alternative? Which is 1.5 to 2 degrees lower than thermostat set point - the electric heat or auxiliary heat would then come on to make up the temperature difference. Aux Reverse Staging: With this setting enabled, you will also need to enable the Aux Heat Stage 2 Temperature Delta threshold setting listed above and set a temperature value. If outdoor temperature is in-between the high and low balance point, both the heat pump and auxiliary heat sources can operate. I thank you for any replies I get. Auixiliary Heat will turn on automatically when heat can no longer efficiently transfer heat from the outside air to heat pump. For example, if your AUX lockout temp is 40ºF or 4.4ºC, then AUX heat will come on when the outdoor temperature drops below 40ºF or 4.4ºC. Page 21 T10 PRO SMART THERMOSTAT WITH REDLINK Table 5. When the outdoor temperature drops below this setting, the thermostat will stop using the heat pump for heating and only use the auxiliary heat. As we mentioned above, AUX heat usually costs up to 50% more than heat transfer, which means if your system is running on AUX heat when it shouldn’t be, your heating bill is likely going to be a lot higher than you’d like it to be. Usually, once outdoor temperatures fall below 35°, a heat pump will struggle to keep your home warm and will automatically switch to AUX heat. Your heat pump absorbs heat from the outdoor air via refrigerant lines and carries that heat inside where it’s used to heat your home’s air. Only auxiliary heat functions below lockout. Of course, … During this time, the system will rely on AUX heat to keep your home warm. Impossible to know though since the documentation is sparse. Monday, February 15(Ontario Family Day)9 a.m. to 9 p.m. EST. Any suggestions? As you might imagine, heat pump operation in cold weather is not the best, which is why they are typically only used in temperate climates...think beaches, palm trees, and oranges. ... and Discharge Temperature Sensor is available. Option 08 - Auxiliary Heat Lockout Temperature. What could be the problem? At temperatures above lockout, the system operates like non-restricted mode. The space temperature sensor needs to be at least a two-stage thermostat. Option 08 —Auxiliary Heat Lockout Temperature This selection is available on heat pump systems with a valid outdoor temperature sensor connected. The latest wiki has been moved here.. aux_heat_temperature_lockout – Outdoor temperature at which auxiliary heat will come on when thermostat is calling for heating . If temperature is not reached in a reasonable time, set the upstage timer (Function 0346). Single stage heat pumps with or without auxiliary heat 250mv – 750mv millivolt heating systems: Control Range: 45° to 90° F ( 7° to 32° C) Display Range: 40° to 99° F (5° to 37° C) Accuracy +/- 1° F (+/- .5° C) Temperature Differential.5°, 1°, or 2° F (0.2°, 0.5°, or 1° C) Storage Temperature: 14° … If it gets colder outside than the set lockout temperature, your heat pump will use AUX heat. That said, even though electrical resistance heating warms your home quickly, we would caution you against triggering your system’s AUX heat unless absolutely necessary. When the heat pump can no longer maintain the desired temperature setting, then the auxiliary heat must come on to assist. So before you call a professional, check the outdoor temperatures. Option 09 - Heat Pump Lockout Temperature. Auxiliary heat (Only for heat pumps with auxiliary heat) Low battery Temperature setting warning Display screen Press the FAN button to select: Auto: Fan runs only when heating or cooling system is on.

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