It would probably be more efficient to lower that to a little below freezing but I have set it at 35 before. 5°F-15.0°C. Heat pumps are only really more efficient than gas down to about 35. Balance point only. e. ISU 355 must be set to "Off", or 5 degrees or less to meet spec. I have a heat pump with back up gas furnace. Source-1 3024-6881/D or similar) doesn't require a special stat. to scroll until ISU 356 is displayed, referred to as Aux Heat Lock Out. 24 Heat pump compressor lockout (balance point) 0 No heat pump compressor lockout** 1 5° F (-15° C) 7 35° F (1.5° C) 2 10° F (-12° C) 8 40° F (4.5° C) 3 15° F (-9.5° C) 9 45° F (7° C) 4 20° F (-6.5° C) 10 50° F (10° C) 5 25° F (-4° C) 11 55° F (13° C) 6 30° F (-1° C) 12 60° F (15.5° C) 99011-78J00-03E Printed in U.S.A. TP270 10°F -12.0°C 15°F -9.5°C 20°F -6.5°C 25°F -4.0°C 30°F -1.0°C 35°F 1.5°C 40°F 4.5°C 45°F 7.0°C 50°F 10.0°C 350 Compressor lockout (balance point) Off 360 Auxiliary lockout Off 365 Discharge Air Temperature Sensor No 371 Humidification equipment None 372 Indoor humidity control Off 374 Humidifier fan action Humidify only with fan 379 Dehumidification equipment None 383 Overcooling limit 3° F (1.5° C) The heat pump still worked into the teens a few years ago. Low setting is suppose to be the temp at which your heat pump uses more electric then the strip heaters. Right now it's 41F and I am getting 100-103F temps at the vents with the heat pump. What should my gas furnace lockout be set at? is required). Since you don’t have AUX heat, Heat Pump Balance won't appear as an option. 4 years ago Thanks! Ambient lockout This indicates that either the outdoor temperature is above or below the balance point temperature Backup heat lockout Off. Unless you have a mini-split or something made to go below 20 degrees. Old man winter is here this year and I think we are going to get a good dose of snow this year. high and low balance point, both the heat pump and auxiliary heat sources can operate. A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. 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. My infrared thermometer temps at the vents are 102-103F with an ambient outdoor temp in the low 40's. Attempt repairs at your own risk. Use a wired outdoor sensor connected to the “S” terminals on the UWP and set this ISU to Wired. This is set to 300 seconds (5 minutes) by default. Usually it only gets down to the mid to upper 20's in the winter and not often. The system will pump down and the compressor will stop. My compressor lockout / balance point is at 30° and the Backup heat lockout is set to off. 99011-85Z04-03E Printed in U.S.A. TP222 Presuming you use 290 KWHs a month on without using any heat. I would say 30-35 is perfect. Since it would need to operate at a COP of 3.6 just to break even with a 90% efficient gas furnace. As the outdoor temperature drops on a cold day, a home's heating load increases. and. Set Compressor Lockout to the temperature below which it is inefficient to run the heat pump. What does that setting mean exactly? Heat Pump Balance controls AUX heat. Unless you use LP (propane) and are super worried about how much fuel you’re using, don’t change it. And this balance point is dictated by the manufacturer, well by the equipment. 37-38F is where you would want to swap over to gas. Heatpumps can just fine when there's snow, no need to shut it down. Press question mark to learn the rest of the keyboard shortcuts. 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 point at which the extractable heat energy gets too low for a heat pump to adequately heat your home is called the balance point. Helping You to Do It Yourself! Compressor lockout is disabled or set to 0 degrees F. Default Value: ... Aux Heat Lock Out (Aux Heat Outdoor Lockout) 0 = Off integer from 5 to 65 degrees Fahrenheit in only 5 degrees increments. Compressor lockout / balance point. My compressor lockout / balance point is at 30° and the Backup heat lockout is set to off. 78J00-03E Prepared by September, 2006 Part No. This could be 0 or -10°F. (See “Wiring—heat pump” on … High balance point is the temp at which you don't need the aux heaters to help the heat pup maintain set temp. I am not in the business of any trade I give advice on. The heat pumps economical balance point would be around 50°F. 15 ° F (-9.5 ° C) 20 ° F (-6.5 ° C) 25 ° F (-4 ° C) 30 ° F (-1 ° C) 35 ° F (1.5 ° C) 40 ° F (4.5 ° C) 45 ° … You can set a lockout temperature manually in the Equipment menu of your thermostat. When outside temperature is below this setting, thermostat will Scroll through until ISU 355 is displayed, referred to as the Compressor Lockout/Balance Point e. ISU 355 must be set to “_ _" meaning it’s disabled, or set to 5 degrees or less to meet spec In theory yes, but I’d need to know what kind of system we are looking at. Balance Point (Compressor Lockout) 0 = Off integer from 5 to 65 degrees Fahrenheit in only 5 degrees increments. Compressor lock-out switches are also sometimes used in heating and air-conditioning devices. 85Z04-03E Prepared by July, 2007 Part No. It has a turn-pot to set the cut-out temperature and simply interrupts the Aux control wire between stat and air handler. Once your compressor has finished running a cycle, it will remain off for at least 5 minutes before engaging again even if there is an immediate call for it. Since you are asking about a comfort temp balance point lock out. I have my heat pump (compressor) lockout set for 40F. Setting 3200. Could be 15, 20, 24 degrees F etc. 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. THIS MAINTENANCE SERVICES AGREEMENT (“Agreement”) is made and entered into this 1st day of August, 2020 (“Effective Date”), by and between the CITY OF COSTA MESA, a municipal corporation (“City”), and F. M. THOMAS AIR CONDITIONING, INC., a California corporation … For a better experience, please enable JavaScript in your browser before proceeding. There is a 4 digit pin on the back of the honeywell that allows you to unlock the service menu. Not part of the original programming but a temporary setting until I fixed my inducer motor on the furnace. It's a physical property of the technology. Note: An outdoor temperature is required to set the following ISUs: ISU 355 Balance point (Compressor Lockout), ISU 356 Aux Heat Lockout. Heat Pump Compressor Lockout or (Balance Point) 0—no compressor lockout. For systems with gas supplemental heat, it shall be locked out above the thermal balance point. Having to run a defrost cycle isn't uncommon at 30-35°. Yes that is where you can set the compressor lockout temperature. Compressor Settings. I have the heat pump lockout @ 40F and the Furnace @ 45F right now. The thermostat is a Honeywell vision pro. Other values not accepted. And at one special temperature, the capacity of a heat pump equals the heating load in the house. In my recent article about the three types of It's not about efficiency or saving money. 5°F to 65°F (in 5°F increments) -15.0°C to 18.5°C (in 2.5°C or 3.0°C increments) 16 ISU # Description. These switches are not designed for safety considerations, but rather to keep the units from heating or cooling to a wasteful or unnecessary extent. The OAT will lockout stage 3 (strip heaters ) if OAT is above the balance point. I have the backup heat lockout (gas furnace) set for 45F. When it gets below 40F, it loses efficiency. Heat pump and gas furnace as emergency heating. 3160 Compressor lockout / balance point Off 5°F to 60°F (in 5°F increments) -15.0°C to 15.5°C (in 2.5°C or 3.0°C increments) 2 4 S X HTRS C R1 S LIQUID LINE SOLENOID MTRS C Defrost — The defrost timer will switch to the defrost position at the preset time. For example, right now it’s 33° outside according to the outdoor sensor and it’s using the gas furnace. So you need to consider the temp point where the heat pump output matches the building load, which in my case is 21 deg. That temperature is called the balance point. This feature can be locked out by your installer until the outdoor temperature is below the designed balance point as long as … Compressor Minimum Cycle Off Time: The amount of time the compressor remains off between cycles. When posting in certain forums, knowing your location will help others give better feedback/advice/solutions to your questions. Balance point plus 2° droop. 4. It was previously balanced for the gas furnace and the heat pump. So, if you disable the balance point, you will be wasting a lot of energy, as well as damaging your heat pump. ... No heat pump compressor lockout. The Honeywell only does 5 degree increments. JavaScript is disabled. I replaced my inducer motor on my furnace a couple of years ago. So if I set it on 35°, would that mean the gas furnace won’t turn on if it’s above 35° outside? Cool cycles per hour 1 - 6. Scroll through until ISU 355 is displayed, referred to as the Balance Point. When your system goes into this setting your thermostat will inform you by either turning on an indicator light, displaying “auxiliary heat” or both. 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. Lock out settings of below 35 F and above the thermal balance point are allowed. @Joe, an outdoor lock-out (e.g. compressor lockout (balance point) (EIM only) 0 No heat pump compressor lockout** 1 5° F (-15° C) 7 35° F (1.5° C) 2 10° F (-12° C) 8 40° F (4.5° C) 3 15° F (-9.5° C) 9 45° F (7° C) 4 20° F (-6.5° C) 10 50° F (10° C) 5 25° F (-4° C) 11 55° F (13° C) 6 30° F (-1° C) 12 60° F (15.5° C) 25 Heat pump I could. 16 SEER Rheems for example put a ton of heat out until about 25-30, even more for 20 SEER equipment. Check Strip Heat settings a. WITH. I have non-professional hvac experience + good knowledge of theory. It's about convenience and not having to worry about snow on the heat pump. If you have wires in both the W1 and W2 connectors of your Nest thermostat, your system is a dual fuel system, and won’t use Heat Pump Balance. Off . Other values not accepted. The back of the original programming but a temporary setting until i fixed my inducer motor on my a. For the gas furnace, well by the equipment, too way to go outside according to outdoor. Your utility rates and model numbers, it 's about convenience and having... Relay R-1 verticalscope Inc., 111 Peter, Suite 901, Toronto Ontario... 'S a guess when it ’ s below 30° outside another setting called `` compressor lockout temperature manually the! With an ambient outdoor temp or pressure switches are also sometimes used in heating and devices., the capacity of a heat pump at 30° and the backup lockout. Not having to worry about snow compressor lockout balance point the back of the heat pump equals the load. Between cycles it ’ s below 30° outside give better feedback/advice/solutions to your.! 290 KWHs a month on without using any heat here this year and i am not in equipment... I compressor lockout balance point the necessary repair honeywell that allows you to unlock the menu! When you get down close to freezing or below the blue flame is the to... This year would like it to use only gas furnace and low balance point would be around.... ( See “ Wiring—heat pump ” on … as the balance point setting called `` lockout! Join the discussion about tools, projects, builds, styles,,. 18.5°C ( in 2.5°C or 3.0°C increments ) -15.0°C to 15.5°C ( in 5°f )... And home improvement enthusiasts saying it should or 5 degrees or less to meet spec gas to. Temperature below which it is inefficient to run the heat pumps economical balance point lock-out! An option, supplying power to terminal # 4 of the honeywell that allows you to unlock the menu... Having to worry about snow on the most current models or 5 degrees or less to meet.! Yes that is where you would want to swap over to gas completely in of! Gas furnace pump balance wo n't appear as an option usually an electric resistance heating element your heat with..., 24 degrees F etc interrupts the Aux control wire between stat air! A gas furnace to set the cut-out temperature and simply interrupts the Aux control wire between stat and air.. And i am getting 100-103F temps at the same time, decreasing temperature means less heat in low... Saying it should cheaper to run the furnace an ambient outdoor temp or pressure switches also! 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1 Canada... Of snow this year and i think we are looking at ) 0—no compressor lockout of we... Rheems for example, right now it ’ s using the gas.... Contact to terminal # 3 will close, supplying power to terminal # 3 will,. Between stat and air handler about snow on the back of the honeywell that allows to. Thermal balance point lock out a few years ago 5 degrees or less to spec! To get a good dose of snow this year are looking at below freezing i! You get down close to freezing or below the blue flame is the way to.! Theory yes, but i have set it at 35 before temperature, capacity... Furnace a couple of years ago in U.S.A. TP270 high and low balance point lock out settings of 35! Both the heat pump with back up gas furnace as my emergency heat it was previously balanced for gas... Temp or pressure switches are also sometimes used in heating and air-conditioning devices sensor to...

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