http://hvac-talk.com/vbb/showthread.php?t=1241, http://hvac-talk.com/vbb/showthread.php?t=116113. Show Printable Version; 02-02-2019, 04:25 PM #41. pecmsg. Nothing could get the fan to turn in other than heat mode. “I haven’t failed. If it seems to be helpful, we may eventually mark it as a Recommended Answer. 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. 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. It squeezes the refrigerant from your unit and raises its pressure and temperature, thus pushing out to cool the air in your unit. There are two different lockout temperatures that are set on the Nest. Nest was a 1/2 off promotion from my electric company. One minor point regarding the base serial number you mention that you said isn’t correct. The Thermostat belongs to me. One is to use the “–index” argument. If it says "In 2 hours" that is Nest's Time-to-Temp algorithm. There is a 10 degree dead zone between the aux lockout and compressor lockout. When you submit a report, we'll investigate it and take the appropriate action. Participate in over 40 different forums and search/browse from nearly 3 million posts. Why Nest thermostat is short cycling the AC Before you call a professional, take a few minutes and follow a … For example, “–index 1” to use the second nest. You can try the following link as a workaround and let me know if that works: Discard post? Page 24 Heat Pump: Both auxiliary and compressor lockout temperatures can be changed in the Heat Pump section of the Advanced Settings menu. By default Nest will activate the heat pump balance, which then automatically determines the aux heat lockout temperature. Locate any unconnected wire labeled W or W1. I just thought I'd get better HVAC management - guess not. Contaminants in the system. When I moved in, the heat pump compressor lockout (thermostat setting 0350) was set at 35 degrees. You will need to lower the compressor lockout function 350 to lower the aux lockout on 360. Yes, so far I'm disappointed with Nest as I thought it's "brain" would work out the best settings - but I will say that those compressor on and aux on settings are far more adjustable than my old Honeywell. Just an FYI, but the nest is a really poorly conceived device that catches a lot of folks with flashy advertising. 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). We found the following personal information in your message: This information will be visible to anyone who visits or subscribes to notifications for this post. Go to the Legal Help page to request content changes for legal reasons. Accordingly, what causes compressor lockout? I have just begun using the new Device Access API, and I find the list of traits returned for the Nest Thermostat to be extremely limited compared with what Nest provided when I purchased my Thermostat before Google took over. How to override outside temperature lockout for (cooling) compressor? To turn them on, go to. Some community members might have badges that indicate their identity or level of participation in a community. Our automated system analyzes replies to choose the one that's most likely to answer the question. Thread Tools. ... For instance, you'll see the Nest Leaf to let you know that you've selected an energy-saving temperature. Compressor and Auxiliary Heat Lockout Temperatures for Heat Pumps Requires Wi-Fi: Both auxiliary and compressor lockout temperatures can be changed : The lockout temperatures are only enforced when the Nest Thermostat is connected to Wi-Fi so it can track outdoor temperatures. If you have a heat pump system, place it into the O/B terminal. I stillhave the old stats so I could just re-install them. Is this limited to testing only, or will the Nest prevent the cooling from running in operation mode as well? I chatted with support, their response was: Dan A (Nest): Yes this is limited to testing only. The default is always use. Are you sure you want to continue? I’ve just found 10,000 ways that won’t work.” - Thomas Edison. Thank you. In this video we go over the heat pump balance feature in the programming of the NEST thermostat. The second is the heat pump lock out temperature, when the location is below this temperature, it will not use the heat pump, and just use Aux. Ask Our Pros-Owner Assistance - NO DIY advice will be given. Rapidly turning your compressor on and off is very bad, but as far as I know there is no UI for this state. If you haven’t purchased a Nest thermostat, use the Compatibility Checker to tell if your system can work with a Nest thermostat. Try Prime Cart. Nest Learning Thermostat 3rd gen. model is the only smart thermostat on the market right now that supports up to 3 stages of heating (the rest stop at 2). We appreciate your patience and understanding during this time. I think you need to go through the settings and find out what is keeping the heat pump from coming on. Another Type of Lock Out Switch. Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. Details. Failed to attach file, click here to try again. This reply will now display in the answers section. The more reliable way is probably to use the “–serial” argument, as this would be tolerant if nest ever changes the ordering of the thermostats in the list. The first is the Aux lock-out temperature, when the location is above this temperature, it will not use Aux. The minimum is -25, and you can adjust it up to 32. You can view them via the “Settings->Technical Info” menu on the Nest itself or … Inadequate oil lubricant. It is on a split system Trane heat pump. Please visit the link: https://support.google.com/googlenest/answer/9248719?hl=en, to change the lockout temperature, under the section "How to change Heat Pump Balance settings". After I installed the stat I ran it through the modes to make sure it would function. The idea is that you have a control parameter(in our case temperature) and […] Skip to main content Hello, Sign in. Post contains harassment, hate speech, impersonation, nudity; malicious, illegal, sexually explicit or commercial content. You'll receive email notifications for new posts at. There are two serial numbers for each Nest – one for the base half and one for what I assume is the LCD half. If anybody else has experience this and can confirm, please post. Last night I was awakened by what sounded like the compressor getting ready to explode. Set on the Nest some reason it is not coming on, then something is it. Polls and access other special features in heating and air-conditioning devices nothing could the... 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