This mode is most useful if you live in a region where the temperature fluctuates regularly or you’re in the middle of a season change and you may need both heating and cooling at different times during the day. This can be done by going to MENU > SETTINGS > INSTALLATION SETTINGS > THRESHOLDS > COMPRESSOR MIN OUTDOOR TEMP. Compressor lockout. The thermostat is a Honeywell vision pro. It was previously balanced for the gas furnace and the heat pump. Presuming you use 290 KWHs a month on without using any heat. What does that setting mean exactly? 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. When it gets below 40F, it loses efficiency. I have a gas furnace as my emergency heat. A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. 0 Thermostat controls backup heat (outdoor sensor required) 18 Dual fuel heat pump ... 0 No droop control** 2 Droop control with Aux Heat Lockout** 20 Droop temperature (dual fuel) (EIM only) 2 Auto temperature droop 2° F (1° C) [Options: 2 to 5 (2 to 5° F / 1 to 2.5° C)] ... 90 Max. When posting in certain forums, knowing your location will help others give better feedback/advice/solutions to your questions. With the Nest app. The temperature below which you want to use Auxiliary heat (rather than the heat pump compressor) is referred to as the "Compressor Lockout" setting in the website and app interfaces. For example, right now it’s 33° outside according to the outdoor sensor and it’s using the gas furnace. If I set it to 30° would that mean gas won’t turn on above 30°? For example, right now it’s 33° outside according to the outdoor sensor and it’s using the gas furnace. Also, both the heat pump and the electric backup run on very short cycles. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! I could. My compressor lockout / balance point is at 30° and the Backup heat lockout is set to off. Tap Heat Pump Balance. Select your thermostat. 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. When the backup heat droop is set to 2 F or higher and the backup heat … It is signaled as “backup” for your actual heating system since the outdoor heat pump doesn’t seem capable of handling the situation on its own. Without the service menu I could not change the lockout temps that were completely in favor of the heat pump. It's about convenience and not having to worry about snow on the heat pump. 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. 16 hours sounds good but you could also turn it off if your droop setting works. 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 say 30-35 is perfect. Not part of the original programming but a temporary setting until I fixed my inducer motor on the furnace. 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 above". I have a heat pump with back up gas furnace. Helping You to Do It Yourself! Catpower The Crowd Pleaser. See Installer Setup options (ISU 3120). Compressor lockout * No backup heat unless indoor temperature drops to selected Backup Heat Differential setting, or Backup Heat Upstage Timer expires. Since it would need to operate at a COP of 3.6 just to break even with a 90% efficient gas furnace. The lowest possible range in Auto mode the ecobee can maintain is 2⁰F/1.1⁰C. Tap Settings . New comments cannot be posted and votes cannot be cast, All things related to HVAC - Heating, Ventilation, & Air Conditioning, Press J to jump to the feed. I have the heat pump lockout @ 40F and the Furnace @ 45F right now. Re-setting the system to heat mode and the fan to auto mode should solve these issues. My compressor lockout / balance point is at 30° and the Backup heat lockout is set to off. Along these same lines, the auxiliary heat may come on if the unit has been running for ten to fifteen minutes without any change in the temperature of your home. 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. When the backup heat droop is set to 2 F or higher and the backup heat … Heat pumps are only really more efficient than gas down to about 35. level 1. This safety feature makes turning the system back on possible until the reset button on the outside unit is pressed back in. I had to use the heat pump exclusively until I completed the necessary repair. Unless you have a mini-split or something made to go below 20 degrees. This applies to a heat pump with electric back up heat. My infrared thermometer temps at the vents are 102-103F with an ambient outdoor temp in the low 40's. Set the outdoor temperature at which you want to lock the heat pump out and have the backup take over and call for heat." This is set at a default 35F (1.7C), so the heatpump will not be used when the weather outside is below 35 degrees … Press question mark to learn the rest of the keyboard shortcuts. If checking the thermostat doesn’t solve the problem, and your system still isn’t heating and cooling correctly, you’ll need to start looking more closely at the indoor and outdoor … After verifying compressor lockout in step 3, use the button under “Select” to scroll until ISU 356 is displayed, referred to as Outdoor Lockout Backup. Note: refrain from pressing buttons under the + and - as this will change the settings. This is set to 5⁰F/2.8⁰C by default, meaning the shortest range you can maintain in Auto mode is 5⁰F (70⁰–75⁰, for example). When you get down close to freezing or below the blue flame is the way to go. The Emergency Heat setting should only be used when the outdoor unit of your heat pump system is not working properly. VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Close. Select Heat Pump Balance then choose the setting you want. Electric - Backup heat allowed to run with heat pump Heat pump only Backup heat lockout Heat pump with backup heat as needed * Compressor lockout Backup heat only No backup heat unless indoor temperature drops to selected Backup Heat Differential setting, or Backup Heat Upstage Timer expires. Before adjusting this setting, we recommend … ... Not sure how you are controlling back up. I recommend sizing the heat pump to meet heating load at, say, 10°F. I have my heat pump (compressor) lockout set for 40F. Can AC compressor be repaired? Usually it only gets down to the mid to upper 20's in the winter and not often. In theory yes, but I’d need to know what kind of system we are looking at. I would like it to use only gas furnace when it’s below 30° outside. JavaScript is disabled. Hi. 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. I am not in the business of any trade I give advice on. Normally we want to lock the heat pump out so that backup heat is primary heat source at around 20 to 25 degrees as it becomes inefficient due to lost capacity. System setting Em Heat-Heat-Off-Cool-Auto Fan setting Auto-On-Circ-Follow Schedule Terminal Voltage (50/60 Hz) Max. This is what was set at 35 degrees and is now set at 15 degrees. I have a gas furnace as my emergency heat. This heat setting should only kick on when the heat pump can’t produce enough heat to warm your home or if your heat pump goes into defrost mode. I know in the real cold back in January mine ran 30 - 35 hours straight and only needed backup in the morning because it drooped 2 degrees. The last thing needed in thischain, though, isreliable lockout of auxiliary heat operation when outdoor temperature isrelatively mild. I run my heat pump down to - 10° as my back up heat is oil and we don't like oil - I have not used oil in the last two winters despite what people say I find its just fine ... most are set to lockout around 40*. ... a recent contracter suggested a heat-pump system in the basement with a new oil furnace to back-up the system is the temp. The backup heat should be locked out at around 5o degrees meaning backup can not come on above 5o Right now it's 41F and I am getting 100-103F temps at the vents with the heat pump. Outdoor temperature. The actual setting is called Balance Point OAT - States that "Heat Pump operates above the balance point setting and the backup heat operates below the set point. I set the function 350 (compressor lockout) to 15 degrees, the lowest that the Honeywell 8321U would allow. Where required, these units, with appropriate accessories, may be applied to operate at outdoor temperatures below 550F. I have the backup heat lockout (gas furnace) set for 45F. Right now it's 41F and I am getting 100-103F temps at the vents with the heat pump. Select a Heat Pump Balance setting. If it is called "backup heat upstage timer" then it sounds like it only does backup. I have my heat pump (compressor) lockout set for 40F. If it's going into aux heat, then it's because the outdoor temp or pressure switches are saying it should. Good thing its not for money saving. Heat pump and gas furnace as emergency heating. 37-38F is where you would want to swap over to gas. Depends on the SEER of the equipment, too. There is a 4 digit pin on the back of the honeywell that allows you to unlock the service menu. It's not about efficiency or saving money. That did not change the settings allowed for function 360 (aux lockout) below the previously set 40 degrees and the aux heat still comes on at any temperature below 40 degrees. 1. I have non-professional hvac experience + good knowledge of theory. I have the backup heat lockout (gas furnace) set for 45F. If ISU 356 is not listed as an option, strip heat lockout is not configured and does not meet spec … The heat pumps economical balance point would be around 50°F. There may be a mechanical outdoor air stat in the heat pump if the wall control isn't doing it. Without your utility rates and model numbers, it's a guess when it's cheaper to run the furnace. I think they market them as still good down to about 20F on the most current models. 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. This setting prevents your equipment from short cycling. AUX heat refers to your heat pump’s “backup” electric resistance heating. So, let's say you set both lockouts at 30F and the droop at 2F and you set your heating setpoint at 60F. 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. For a better experience, please enable JavaScript in your browser before proceeding. So if I set it on 35°, would that mean the gas furnace won’t turn on if it’s above 35° outside? 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. Having to run a defrost cycle isn't uncommon at 30-35°. 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. But heat pumps also have one huge benefit that furnaces lack: Unless you use LP (propane) and are super worried about how much fuel you’re using, don’t change it. The heat pump still worked into the teens a few years ago. The Honeywell only does 5 degree increments. Setting temperature lockout on Trane Heat Pump. Many homeowner misuse this setting more than any other. When it gets below 40F, it loses efficiency. Heat pump stays ON when backup heat … After verifying compressor lockout in step 4, scroll to Code 312 "Outdoor Lockout BACKUP HEAT" b. Verify temperature is set to 35 degrees or less to meet spec 16 SEER Rheems for example put a ton of heat out until about 25-30, even more for 20 SEER equipment. Old man winter is here this year and I think we are going to get a good dose of snow this year. Most modern heatpump are designed to run until about 35 degrees outside. Heatpumps can just fine when there's snow, no need to shut it down. And it also allows you to "lockout" the backup heat if temp is not below a certain temp, once again adjustable between 5F and 60F in 5F deg increments. We know you have questions, so … Backup heat lockout. Current Rating W - O/B 18 to 30 VAC and 750 mVDC 1.00A Y (cooling) 18 to 30 VAC 1.00A G (fan) 18 to 30 VAC 0.50A W2 - Aux 1 (heating) 18 to 30 VAC 0.60A W3 - Aux 2 (heating) 18 to 30 VAC 0.60A Y2 (cooling) 18 to 30 VAC 0.60A Lock out or Reset Overheating caused by clogged air filters or other factors can cause an air conditioner to shut down and even go into a lockout mode. Attempt repairs at your own risk. Backup heat lockout. Heat-pump output drops as the outdoor temperature drops. The optimal heat pump temperature range is above 25-30 degrees Fahrenheit. 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. What should my gas furnace lockout be set at? I replaced my inducer motor on my furnace a couple of years ago. 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.