The temperature drops to 68 degrees inside. However, when the outside temperature is 32° F or below, your auxiliary heat will usually turn on automatically. 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. Our suggestion would be to reach out to a professional as soon as possible. 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. 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. If you contact me off list, I can assist with further troubleshooting. Please Note: if OAT is less thanAuxiliary Heat Lockout temperature setpoint the auxiliary heat may engage. Secondly, it means the outdoor temperature is too cold, so your heat pump is using “backup” heat to heat your home. Why does my nest say aux heat? In most cases, lockout temperature is 40ºF. At temperatures above lockout, the system operates like non-restricted mode. 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. It becomes necessary once the temperature drops below a certain point. Now this 'COMP TO AUX DELTA' option is asking for how many degrees the indoor temperature should drop before using the auxiliary heat. So I would like to set the heat pump not to run below, say, 20 degrees and just use the aux. 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. Consequently, it is recommended to only lower your set point by 3˚ – 5˚ when your system is in the unoccupied or night setting. 5 years ago. 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). Auxiliary Heat Lockout must be set to ≤ 35 degrees to meet specification . Now I keep on getting alerts that the Aux heat is running. First off, this means you have a heat pump (more on that in a moment). REVERSING VALVE SHIFT DELAY Limit excessive noise in and out of a defrost cycle. Member. In this option, please select what you find best fits for you. Aux heat should only kick on when the heat pump can’t produce enough heat to warm your home on its own. 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. PTCS Heat Pump Thermostat Support Sheet . Get in touch with our support team. ... and Discharge Temperature Sensor is available. We have a heat pump and recently installed an ecobee thermostat. Dual fuel and aux heat lockout with outdoor sensor or Internet weather. 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. 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". In many heating systems, auxiliary heat comes ON when the outdoor temperature drops below a certain threshold. There are two main reasons as to why this may happen. 35), the compressor is locked-out and ONLY the auxiliary will run when the outdoor temp drops below the specified temp. Note: Normal programmable thermostats have one way to control AUX heat: the AUX lockout temperature. The TH8110 Thermostats provide temperature control for gas, oil, electric and heat pumps for 1 heat, 1 cool systems. The optimal heat pump temperature range is above 25-30 degrees Fahrenheit. Auxillary Heat implies that you have an Air Source Heat Pump. Off Turning off “Heat Pump Balance” means that the AUX heat only kicks in depending on what you set as a lockout temperature. 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. Any suggestions? Auxilliary heat lockout? AUXILIARY HEAT LOCKOUT Above the selected temperature, auxiliary heat will only run during defrost operation. And if not, what's my best alternative? For some homeowners, the “AUX” heating source will be electrical resistance heating, which are essentially large wire heating elements that are heated by electricity. Temperature management is one of the key challenges of the game. 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. 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. Just contact us and we’ll send one of our Phoenix techs right over. Once it gets close to the actual setpoint, the aux heat de-energizes and the heat pump mode of the system remains operating to generate heat and will shut off if the temperature is satisfied. The Emergency Heat setting should only be used when the outdoor unit of your heat pump system is not working properly. What this means, unfortunately, is that it’s more expensive than the conventional heat provided by a heat pump. 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. With Heat Pump Balance, you don't have to worry about the AUX lockout temperature. If you use the lowest setting, chances are your AUX heat won’t kick in anymore and the notification will be gone. Heat pumps work most efficiently when maintaining a temperature. My question is, is there a way around this to actually set the lockout temperature? The reason for this is that a heat pump does a very good job of maintaining temperature, but is very poor at recovering temperature. To be safe, disable the Aux Lockout if you go away. If outdoor temperature is below the low balance point, only auxiliary heating will operate - default 25°F (-4.0°C) low. Auxiliary Heat. If it’s an unusually cold Arizona day, it’s normal to see AUX heat on your thermostat. Upvote #2 12-09-14, 01:54 PM K. ksefan. iii Glossary of Terms Auto-Changeover: A mode in which the thermostat will turn on the heating or cooling based on room temperature demand. What Does Auxiliary Heat Mean on My Thermostat? Turning off “Heat Pump Balance” means that the AUX heat only kicks in depending on what you set as a lockout temperature. This threshold is known as lockout temperature. 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. Usually, once outdoor temperatures fall below 35°, a heat pump will struggle to keep your home warm and will automatically switch to AUX heat. And when outdoor temperatures drop too low, there’s simply not enough heat in the outdoor air to keep your home warm. To also avoid short cycling and increase equipment efficiency, you can go to MENU > SETTINGS > INSTALLATION SETTINGS > THRESHOLDS > ​HEAT DIFFERENTIAL TEMP > and change this to a higher value so that the system turns on for a bigger temperature drop and reduces short cycling. The important thing to remember is that “AUX” heat is fast and dependable but it’s also more expensive than heat transfer heating. This way, the aux heat can engage if you have a system lockout, and keep the house from freezing. 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. Location: usa. Heat transfer is the most efficient (and cheapest) type of heating, and it’s your heat pump’s main solution for heating your home. During this time, the system will rely on AUX heat to keep your home warm. 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. OF (off) -- function is disabled. Some heatpumps can take longer than others to warm up and finally start giving heat. Final Thoughts: At What Temperature is a Heat Pump Not Effective? HOWEVER, as we also mentioned above, electrical resistance heating (AUX heat) is more expensive than heat transfer. If temperature is not reached in a reasonable time, set the upstage timer (Function 0346). As we mentioned above, heat pumps absorb heat from the outdoor air and then move that heat indoors. EM heat is an option on your thermostat that you can manually turn on to activate backup heating. The heat pump mode is operating but can not keep up. This is when the outside is around 35-40 degrees and the indoor temperature is around three degrees cooler than the thermostat setting. 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. My questions are, what settings for heat pump lockout? There isn’t enough heat getting to the heat pump. Similarly Chilliness can spread by air … The Lockout temperature is set lower than usual but not to the lowest setting. Just leave your thermostat’s setting on Heat, and let it do its thing. My best advice is to find another tech. 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. 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. 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 auxiliary heat (electric resistance heat, or back-up heat) is minimized since it is more expensive. For example, let’s say that you wake up to a cold home (62° F) and immediately raise the thermostat to 68°. Many homeowner misuse this setting more than any other. 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. I thank you for any replies I get. When outdoor temperatures reach freezing temperatures, the outdoor coils can begin to freeze over with ice. Available settings are: Off, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55. The outlet temperature with and without Aux heat depends on outdoor temp, wattage of electric heat strips and CFM setting. Synopsis module residential; class house { double aux_heat_temperature_lockout[]; } object house { aux_heat_temperature_lockout value; } Remarks. 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. Auxiliary heater Part #: 7E0963273A Component: STH-T5GP2 Coding: 4101 (hex) Fault codes: 00056 Blower engine for temperature sensors inside (V210) 00002 Transmission Control Unit 00057 Actuator shut-off valve b-column and floor space, right (V211) 00135 Left Front Wheel Acceleration Sensor (G337) I think that the fault code descriptions may be wrong, especially the 00002 … Of course, … Auxiliary heat is less energy-efficient than your heat pump, and it is meant to only run for … 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. Model TH6220WF2006: Up to 2H/1C Heat Pump systems or up to 2H/2C Conventional systems. This applies to a heat pump with electric back up heat. I control that temperature through my WIFI Thermostat. 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. 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. 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). This is an outdated page. 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. Join Date: Dec 2014. 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. An auxiliary fuel pump supplies the fuel at low pressure to the FFBH. If it gets colder outside than the set lockout temperature, your heat pump will use AUX heat. Selectable from -10° to 35°F or off*. Selectable 0, 12 … Auxiliary heat is allowed to operate whenever sufficient demand for heat is available. In fact, electric resistance heating is about 50% more expensive than heat transfer. If you use the lowest setting, chances are your AUX heat won’t kick in anymore and the notification will be gone. 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. The thermostat is set to 70 degrees. system called a "heat pump", and live in an area where the temperature in the winter goes below about 50°F (or 10°C) then you probably have something called "emergency heat" or "auxiliary heat". 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). Impossible to know though since the documentation is sparse. Will start soon For example, let’s say that you wake up to a cold home (62° F) and immediately raise the thermostat to 68°. Option 08 —Auxiliary Heat Lockout Temperature This selection is available on heat pump systems with a valid outdoor temperature sensor connected. 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. c. Auxillary Heat Lockout (strip heat lockout) must be set to "35" or lower to meet PTCS specification . Note: Normal programmable thermostats have one way to control AUX heat: the AUX lockout temperature. 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 the heat pump can no longer maintain the desired temperature setting, then the auxiliary heat must come on to assist. What could be the problem? Ventilation control with ERV/HRV or fresh air damper. On: Fan runs continuously. 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). 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. 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 so, that’s normal. Most of today’s thermostats are programmable and allow you to set a schedule to match your preference. The space temperature sensor needs to be at least a two-stage thermostat. Installer Setup (ISU) Installer Setup ISU # Name Settings Default Notes 3120 Backup Heat Fahrenheit: This ISU is used to lockout the auxiliary heat Lockout when outdoor temperature is above this 5° F to 65° F (in 5° F setting. With heat pumps, it's best to set the temp you want and leave it alone. Auto Fan System MCR29409 Auxiliary Heat On Heat Setting Inside72 72 Replace Battery Auto Fan Heat System MCR29406 Heat: Heating system control. Yes, Logic Option - No Sensor Required or Outdoor Sensor Option - Outdoor Sensor Provides Outdoor Temperature Setting to Lockout the Heat Pump and Switch to Gas Heat Heat Pump Auxiliary Lockout Control - Outdoor Sensor Option Outdoor Sensor Provides Outdoor Temperature Setting to Lockout Auxiliary Heat Remote Sensor Options 1 Indoor or Outdoor Power Source Battery, Hardwire, Power … Page 21 T10 PRO SMART THERMOSTAT WITH REDLINK Table 5. 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. Option 09 - Heat Pump Lockout Temperature. The heat pump lockout temperature can be used to force a switch from heat pump operation to auxiliary heating. Up to 3H/2C Heat Pump systems or up to 2H/2C Conventional systems. 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. This extra heat kicks on at a preset temperature. Here’s how it works. Although this situation is rare in Arizona, it’s common in colder parts of the country. Short for auxiliary heat, this system is designed to heat your home up quickly instead of waiting for the cold heat pump on the exterior of your home. Need more help? Auxiliary heat refers to your heat pump’s backup electric resistance heating. The auxiliary heat would kick in at this point to help maintain the temperature in the space. 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