The other method is to disconnect the Aux control wire. In other words if your aux lockout doesn't go lower than 40 degrees then your compressor lockout is set at 30 degrees. Discussion on Google Nest products, including installation and configuration. 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. The compressor lockout is to protect the refrigerant compressor from burning up due to short cycling. 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. Clicking noise heard inside. I've had my Nest for 2 years now and generally it does what I want. Hi. How it affects price: A two-stage compressor will cost more than a single-stage compressor. Sometimes, the sound of the outdoor unit fan or compressor relay can be transmitted in a way that makes it … I have a heat pump with back up gas furnace. every heat pump are the compressor and the coil. Heat pump problems can be frustrating (and expensive). However, you can disable the furnace by changing the System Type in the installer menu to one without Aux heat. With this extreme cold, however, I've hit a problem. Your heat pump should still put out some heat even when temps outside are below zero, not much though. A service tech should be able to set it down to a lower setting no problem. Outdoor heat pump coils are usually around 6 circuits. c. Auxillary Heat Lockout (strip heat lockout) must be set to "35" or lower to meet PTCS specification PTCS Heat Pump Thermostat Support Sheet That unit is a high seer unit and may have compressor cut out on the outside board. High voltage present in the outdoor unit and indoor unit. Then raise to temp it can handle the load. 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. I'm leaning towards an ecobee, but happy to hear any ideas. The Fast setting will determine how fast the second stage or the emergency heat comes on. Some heatpumps can take longer than others to warm up and finally start giving heat. I have seen maybe 3 of those units and one oy my customers elected for the replacement compressor. You can run a heat pump below 32 degrees with no problem it just looses effiency the colder it gets. Compressor Stage 2 Temperature Delta: The minimum number of degrees from the desired temperature (set point) before engaging the second stage of the compressor. 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. But most dual fuel compatible thermostats (those that don't require a dual fuel kit) cannot be programmed to lock out the furnace. The information given below can be helpful for you then. Press question mark to learn the rest of the keyboard shortcuts. the compressor lockout is set at. Need more help? Below we list a dozen causes of high head pressure in an air conditioner or heat pump compressor motor. Should have pin settings for compressor lockout. With this extreme cold, however, I've hit a problem. You will need to lower the compressor lockout function 350 to lower the aux lockout on 360. 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 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). Contractor's Assistant: Did you double-check the thermostat's … 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. And if not, what's my best alternative? 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. Sure how the water is freezing unit and may have compressor cut out on outside. Update I ran the System Type in the website and app interfaces we have been getting down a... 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