The system seems to be running the heat pump down to the teens or below and when the unit ices up it must be running in reverse to try to de-ice. But most dual fuel compatible thermostats (those that don't require a dual fuel kit) cannot be programmed to lock out the furnace. An air source heat pump has two parts, an indoor unit with a coil and a fan to push the air through your home; and an outdoor unit with another coil, another fan and a compressor. 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. How it affects price: A two-stage compressor will cost more than a single-stage compressor. When you read information on the web double check that the information is correct. It's set now, thanks again. Carrier Infinity thermal lockout low/high stage. This can be done by going to MENU > SETTINGS > INSTALLATION SETTINGS > THRESHOLDS > COMPRESSOR MIN OUTDOOR TEMP. If the system starts up before the outdoor temperature has warmed up enough to cause the refrigerant to migrate, the refrigerant will still be sitting in the outdoor coil. Many time when it gets cool over night, the refrigerant will migrate to the outdoor coil. What could be the problem? Yes, I'm talking Fahrenheit. The Fast setting will determine how fast the second stage or the emergency heat comes on. If your heat pump is constantly running, there are likely three main causes: Unusually cold weather: Heat pumps are designed to work much more gradually than a furnace. Compressor Stage 2 Temperature Delta: The minimum number of degrees from the desired temperature (set point) before engaging the second stage of the compressor. With electric backup heat you should not need to lock out backup heat. Not surprising everybody hates heat pumps in this area, the electric bills have got to be insane. I've had my Nest for 2 years now and generally it does what I want. PTCS Heat Pump Thermostat Support Sheet Manufacturer: Honeywell Thermostat Models: T6 Pro TH6320U2008, TH6220U2000, TH6210U2001 Page 1 of 2. July 2018 edited July 2018 in A-C, Heat Pumps & Refrigeration. When heat pump is operating in defrost mode, ice will thaw from around outdoor coil and water will flow from the unit. In other words if your aux lockout doesn't go lower than 40 degrees then your compressor lockout is set at 30 degrees. There is a 10 degree dead zone between the aux lockout and compressor lockout. The compressor lockout is to protect the refrigerant compressor from burning up due to short cycling. This is set at a default 35F (1.7C), so the heatpump will not be used when the weather outside is below 35 degrees … That's exactly what I was looking for, I'll try it - thanks! update I ran the system in cool mode and dropped the house temp 2 degrees and the compressor never locked out. We have a heat pump and recently installed an ecobee thermostat. c. Auxillary Heat Lockout (strip heat lockout) must be set to "35" or lower to meet PTCS specification PTCS Heat Pump Thermostat Support Sheet Usually when the outside temperature is above 30° it uses heat pump only but when it’s close to 30° it uses the back up gas furnace. 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. You can run a heat pump below 32 degrees with no problem it just looses effiency the colder it gets. To save you time, money and frustration, the experts at Carrier have put together a quick heat pump troubleshooting guide. Should have pin settings for compressor lockout. Press J to jump to the feed. If you have a dual fuel system, a type of system with a heat pump outside and a separate heater installed inside your home, you won't be able to use Heat Pump Balance. Need more help? However, you can disable the furnace by changing the System Type in the installer menu to one without Aux heat. 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 heat pump compressor, however, has two main purposes: to maintain the refrigerant flowing inside the heat pump and to increase the pressure in which the refrigerant is compressed into gas. Rheem R-410A Heat Pump Troubleshooting You will need to lower the compressor lockout function 350 to lower the aux lockout on 360. Sometimes, the sound of the outdoor unit fan or compressor relay can be transmitted in a way that makes it … I finally got to change that setting - that's the one I had asked Nest support about, and they hadn't explained that once you click on the "Always" you can select a temperature. So far, that's expected with a heat pump I gather. Heat pump compressor lockout temperature? System in in heat mode. than the heat pump compressor) is referred to as the "Compressor Lockout" setting in the website and app interfaces. Heat pump running constantly. Set compressor lock out to 30, or lower, to see at what temp the heat pump really can't handle the load. 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. Geothermal heat pump systems tap into the energy right in your own backyard—transferring heat to or from the earth to heat or cool your home. Learn how to diagnose common issues before calling in backup. Now this 'COMP TO AUX DELTA' option is asking for how many degrees the indoor temperature should drop before using the auxiliary heat. Below we list a dozen causes of high head pressure in an air conditioner or heat pump compressor motor. I posted about this exact thing 2 weeks ago: https://www.reddit.com/r/Nest/comments/7mizg2/force_aux_heat/. Get in touch with our support team. the compressor lockout is set at. Clicking noise heard inside. And if not, what's my best alternative? I'm leaning towards an ecobee, but happy to hear any ideas. Contractor's Assistant: Did you double-check the thermostat's … My question is, is there a way around this to actually set the lockout temperature? When I did resi, it was not at all uncommon to find units rigged to bring 1st stage electric (5kw) on with the compressor in heat mode. Heat pump problems can be frustrating (and expensive). With this extreme cold, however, I've hit a problem. And his was a heat pump as far as I know it's still running. But on the Nest Thermostat itself, the term "Lockout" is not used, instead you see "Use the heat pump compressor when the outdoor temperature is Discussion on Google Nest products, including installation and configuration. With this extreme cold, however, I've hit a problem. Designed for long lasting performance, the Climatuff has been Heat Pump Repair Advice Advisory. The information given below can be helpful for you then. The compressor has to start from a full stop to full blast in less than a second. 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. 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". If you feel the temperature in your house is getting higher, it may be because of heat pump fan not spinning, and therefore, heat pump not cooling. Then raise to temp it can handle the load. That unit is a high seer unit and may have compressor cut out on the outside board. The system seems to be running the heat pump down to the teens or below and when the unit ices up it must be running in reverse to try to de-ice. No matter what the weather is like outside, geothermal heat pumps deliver energy-efficient performance to give you the most comfortable indoor comfort for your home. I read this directly from an un-named article on the internet that has a number one position in a search for troubleshooting heat pumps – “check the heat pumps … This can be done by going to MENU > SETTINGS > INSTALLATION SETTINGS > THRESHOLDS > COMPRESSOR MIN OUTDOOR TEMP. If you're not talking F, I'm not sure how the water is freezing. New comments cannot be posted and votes cannot be cast. Your heat pump should still put out some heat even when temps outside are below zero, not much though. Is a Password Requried? If it’s particularly cold where you live, the heat pump may not be able to sufficiently heat your home and the ecobee will instead rely on your aux heat in these cases. It could also be the cycle rate on the heating. I'm assuming you're talking in Fahrenheit, so, assuming your heat pump is more energy efficient than your aux heat, why not just keep the minimum temp at 40F? Some heatpumps can take longer than others to warm up and finally start giving heat. My compressor lockout / balance point is at 30° and the Backup heat lockout is set to off. 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. In the lockout mode, the compressor will not operate, the alarm output is energized and the red LED will blink to indicate which fault has occurred. It’s possible that, if the weather is especially cold, your heat pump could run near-constantly without there being an issue. Heat Pump Split System and AY28X084 Evaporator Defrost Control Thermostat Air handling unit Heat pump Thermostat unit Air handling unit Cooling unit Warning! However, my system has a pretty long exposed condensate drain which is just freezing solid, after which I get water dripping out of my air handler and pooling on the floor. Fault code states "soft lock out" on both the compressor and condenser.. High voltage present in the outdoor unit and indoor unit. In this option, please select what you find best fits for you. Jon Held_2 Member Posts: 21. My understanding is that heat pumps of SEER 15 can be more energy efficient than resistive heat down to about 20 degrees F or so, so that's what I was thinking about setting it to. When the backup heat droop is set to Comfort, the control algorithm will use backup heat as​ needed to maintain the setpoint within +/- 1 F. The user can select either Normally Open or Normally Closed It will run during defrost and if the heat pump can't keep up it will kick on when the indoor temp falls 2 degrees below the set point. So I would like to set the heat pump not to run below, say, 20 degrees and just use the aux. Hi. A single-stage compressor offers just one speed: high. Monday, February 15(Ontario Family Day)9 a.m. to 9 p.m. EST. And a variable speed compressor costs more than both. I then put the system back into heat mode and ran the temp back up 3 degrees the compressor did not lock out in the 30 minutes it took to get there. Caution, entering installer set -up mode may result in altering settings Do not press the + or buttons when in the installer set– -up (ISU) or settings will be altered . A/C or Heat Pump Compressor High Head Pressure Diagnostic Checklist 12 Causes of High Head Pressure at an Air Conditioner, Heat Pump or other Refrigeration System. Upvote. Outdoor heat pump coils are usually around 6 circuits. The other method is to disconnect the Aux control wire. The Climatuff ® compressor you’ll find at the heart of every Trane XR heat pump is a marvel of reliability, known throughout the industry for providing years of trouble-free comfort. 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. every heat pump are the compressor and the coil. Press question mark to learn the rest of the keyboard shortcuts. When a compressor has problems, both or at least one of these functions stop happening, and very likely the heat pump won’t do its job as expected. 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). Assure high voltage power is disconnected using lockout / tag-out procedures if applicable prior to connecting low voltage wiring. When posting in certain forums, knowing your location will help others give better feedback/advice/solutions to your questions. We have been getting down to 6 degrees F with snow recently, which is when the problem manifested. I've had my Nest for 2 years now and generally it does what I want. Be sure the compressor lock-out function is disabled. I have a heat pump with back up gas furnace. An air conditioner or heat pump compressor pulls a high amp draw on startup, which is technically called locked rotor amps. I have seen maybe 3 of those units and one oy my customers elected for the replacement compressor. No 1. 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