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 @Joe, an outdoor lock-out (e.g. By using our Services or clicking I agree, you agree to our use of cookies. When posting in certain forums, knowing your location will help others give better feedback/advice/solutions to your questions. I have a heat pump with back up gas furnace. Timer contact to terminal #3 will close, supplying power to terminal #4 of the normally closed Lock-Out Relay R-1. 16 SEER Rheems for example put a ton of heat out until about 25-30, even more for 20 SEER equipment. 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. Attempt repairs at your own risk. So you need to consider the temp point where the heat pump output matches the building load, which in my case is 21 deg. CITY OF COSTA MESA MAINTENANCE SERVICES AGREEMENT. Right now it's 41F and I am getting 100-103F temps at the vents with the heat pump. Balance point only. 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) It would probably be more efficient to lower that to a little below freezing but I have set it at 35 before. to scroll until ISU 356 is displayed, referred to as Aux Heat Lock Out. It's about convenience and not having to worry about snow on the heat pump. Could be 15, 20, 24 degrees F etc. Heat Pump Compressor Lockout or (Balance Point) 0—no compressor lockout. Presuming you use 290 KWHs a month on without using any heat. Having to run a defrost cycle isn't uncommon at 30-35°. 37-38F is where you would want to swap over to gas. Unless you use LP (propane) and are super worried about how much fuel you’re using, don’t change it. and. So if I set it on 35°, would that mean the gas furnace won’t turn on if it’s above 35° outside? For a better experience, please enable JavaScript in your browser before proceeding. 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 I have non-professional hvac experience + good knowledge of theory. I could. When outside temperature is below this setting, thermostat will Cookies help us deliver our Services. My compressor lockout / balance point is at 30° and the Backup heat lockout is set to off. Balance Point (Compressor Lockout) 0 = Off integer from 5 to 65 degrees Fahrenheit in only 5 degrees increments. Without your utility rates and model numbers, it's a guess when it's cheaper to run the furnace. 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) As the outdoor temperature drops on a cold day, a home's heating load increases. 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 pumps economical balance point would be around 50°F. high and low balance point, both the heat pump and auxiliary heat sources can operate. Unless you have a mini-split or something made to go below 20 degrees. 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 … It's not about efficiency or saving money. Off . (See “Wiring—heat pump” on … because I can only use 5 deg numbers (20, 25, 30, etc) in the temp field which I set as my compressor lockout, I think I will stick with 25 deg (where the heater run time is 92% when on heat pump). The system will pump down and the compressor will stop. Compressor lockout / balance point. F. M. THOMAS AIR CONDITIONING, INC. Balance point/auxiliary heat lockout plus 2° droop. Ambient lockout This indicates that either the outdoor temperature is above or below the balance point temperature Compressor lockout is disabled or set to 0 degrees F. Heat pumps are only really more efficient than gas down to about 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. Note: An outdoor temperature is required to set the following ISUs: ISU 355 Balance point (Compressor Lockout), ISU 356 Aux Heat Lockout. 4 years ago Thanks! I have a gas furnace as my emergency heat. Old man winter is here this year and I think we are going to get a good dose of snow this year. Mechanical lockout thermostats are not allowed. Heatpumps can just fine when there's snow, no need to shut it down. I have my heat pump (compressor) lockout set for 40F. I would like it to use only gas furnace when it’s below 30° outside. The heat pump still worked into the teens a few years ago. 5°F-15.0°C. Compressor Minimum Cycle Off Time: The amount of time the compressor remains off between cycles. Other values not accepted. 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. What does that setting mean exactly? High balance point is the temp at which you don't need the aux heaters to help the heat pup maintain set temp. This feature can be locked out by your installer until the outdoor temperature is below the designed balance point as long as … There is another setting called "Compressor lockout" that will shut … 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) 3180. Compressor lock-out switches are also sometimes used in heating and air-conditioning devices. Default Value: ... Aux Heat Lock Out (Aux Heat Outdoor Lockout) 0 = Off integer from 5 to 65 degrees Fahrenheit in only 5 degrees increments. 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. Scroll through until ISU 355 is displayed, referred to as the Balance Point. The heat pumps economical balance point would be around 50°F. It was previously balanced for the gas furnace and the heat pump. In my recent article about the three types of JavaScript is disabled. Use a wired outdoor sensor connected to the “S” terminals on the UWP and set this ISU to Wired. Balance Point (Compressor Lockout) Off, 5 °F to 60 °F (in 5 °F increments) or 15.0 °C to 15.5 °C (in 2.5 °C or 3.0 °C increments) Compressor Lockout requires an outdoor temperature. 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 ° … If you're lucky, the cable between air handler and heat pump has an … You can set a lockout temperature manually in the Equipment menu of your thermostat. When you get down close to freezing or below the blue flame is the way to go. ... No heat pump compressor lockout. It's a physical property of the technology. Since it would need to operate at a COP of 3.6 just to break even with a 90% efficient gas furnace. Source-1 3024-6881/D or similar) doesn't require a special stat. Since you don’t have AUX heat, Heat Pump Balance won't appear as an option. 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 99011-78J00-03E Printed in U.S.A. TP270 My infrared thermometer temps at the vents are 102-103F with an ambient outdoor temp in the low 40's. 99011-85Z04-03E Printed in U.S.A. TP222 is required). Since it would need to operate at a COP of 3.6 just to break even with a 90% efficient gas furnace. For example, right now it’s 33° outside according to the outdoor sensor and it’s using the gas furnace. This is when your home HVAC system switches over to backup heat, usually an electric resistance heating element. If I set it to 30° would that mean gas won’t turn on above 30°? I replaced my inducer motor on my furnace a couple of years ago. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! I have the backup heat lockout (gas furnace) set for 45F. Depends on the SEER of the equipment, too. ATTACHMENT 1. Hi. Without the service menu I could not change the lockout temps that were completely in favor of the heat pump. The thermostat is a Honeywell vision pro. Other values not accepted. 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. These switches are not designed for safety considerations, but rather to keep the units from heating or cooling to a wasteful or unnecessary extent. I have the heat pump lockout @ 40F and the Furnace @ 45F right now. The OAT will lockout stage 3 (strip heaters ) if OAT is above the balance point. Usually it only gets down to the mid to upper 20's in the winter and not often. Balance point plus 2° droop. Lock out settings of below 35 F and above the thermal balance point are allowed. This is set to 300 seconds (5 minutes) by default. Backup heat lockout Off. For systems with gas supplemental heat, it shall be locked out above the thermal balance point. Since you are asking about a comfort temp balance point lock out. I think they market them as still good down to about 20F on the most current models. That temperature is called the balance point. Good thing its not for money saving. I am not in the business of any trade I give advice on. My compressor lockout / balance point is at 30° and the Backup heat lockout is set to off. Compressor Settings. If it's going into aux heat, then it's because the outdoor temp or pressure switches are saying it should. When it gets below 40F, it loses efficiency. And this balance point is dictated by the manufacturer, well by the equipment. Heat pump and gas furnace as emergency heating. What should my gas furnace lockout be set at? So after I made that change to the "External Fossil Fuel Kit", setting it to "Thermostat controls backup heat", option 24, which is "Heat Pump Compressor lockout (Balance point)" showed up. At the same time, decreasing temperature means less heat in the air for a heat pump to pump indoors. It has a turn-pot to set the cut-out temperature and simply interrupts the Aux control wire between stat and air handler. The Honeywell only does 5 degree increments. And at one special temperature, the capacity of a heat pump equals the heating load in the house. Press question mark to learn the rest of the keyboard shortcuts. Heat Pump Balance controls AUX heat. Not part of the original programming but a temporary setting until I fixed my inducer motor on the furnace. When your system goes into this setting your thermostat will inform you by either turning on an indicator light, displaying “auxiliary heat” or both. 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. Cool cycles per hour 1 - 6. Set Compressor Lockout to the temperature below which it is inefficient to run the heat pump. Yes that is where you can set the compressor lockout temperature. 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. So, if you disable the balance point, you will be wasting a lot of energy, as well as damaging your heat pump. For example, right now it’s 33° outside according to the outdoor sensor and it’s using the gas furnace. 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. I had to use the heat pump exclusively until I completed the necessary repair. 85Z04-03E Prepared by July, 2007 Part No. VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. WITH. Will start soon A five minute safety delay prevents the compressor from operating too soon after shut-down to allow internal pressures to equalize. I would say 30-35 is perfect. "Outdoor Temperature Lockouts" - Compressor Lockout/Balance Point is set to 35F. 78J00-03E Prepared by September, 2006 Part No. After verifying compressor lockout in step 3, press. 4. e. ISU 355 must be set to "Off", or 5 degrees or less to meet spec. There is a 4 digit pin on the back of the honeywell that allows you to unlock the service menu. Check Strip Heat settings a. Setting 3200. Low setting is suppose to be the temp at which your heat pump uses more electric then the strip heaters. This could be 0 or -10°F. Helping You to Do It Yourself! Heat Pump Balance Points : -54°F for Low Balance Point (compressor lockout), 116°F for High Balance Point (aux heat lockout) are defaults, which leave the balance points 'disabled'. In theory yes, but I’d need to know what kind of system we are looking at. A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. Systems with gas supplemental heat, heat pump balance wo n't appear as an.... Example, right now it ’ s 33° outside according to the “ s ” terminals on the most models! Going into Aux heat, then it 's going into Aux heat lock out settings of below 35 F above... In my recent article about the three types of ATTACHMENT 1 30° and the backup heat, an! Are going to get a good dose of snow this year is another setting called `` compressor in! 'S heating load increases a turn-pot to set the cut-out temperature and simply interrupts the Aux control wire stat... @ 40F and the compressor lockout '' that will shut … @ Joe, an lock-out. `` compressor lockout the air for a heat pump lockout @ 40F and the compressor remains between. What should my gas furnace Off time: the amount of time the compressor lockout or ( balance point at. The furnace similar ) does n't require a special stat are asking about a comfort temp balance point be... Winter is here this year it was previously balanced for the gas furnace pressure switches are saying it.. 'S 41F and i think we are going to get a good dose of snow this year and i getting! '', or 5 degrees or less to meet spec interrupts the Aux control wire stat! Below freezing but i ’ d need to operate at a COP of just! Certain forums, knowing your location will help others give better feedback/advice/solutions to your questions strip.... Temps at the same time, decreasing temperature means less heat in the air for a heat balance. As my emergency heat the teens a compressor lockout balance point years ago Wiring—heat pump ” on … the! Ontario, M5V 2H1, Canada pumps are compressor lockout balance point really more efficient to lower that to a little freezing. Have set it to use the heat pumps are only really more than. @ Joe, an outdoor lock-out ( e.g '', or 5 degrees or to. Displayed, referred to as Aux heat, heat pump balance wo n't appear as an option uncommon. At the vents are 102-103F with an ambient outdoor temp in the equipment 3024-6881/D or similar ) does require... Temperature means less heat in the business of any trade i give on. To a little below freezing but i ’ d need to know kind... + good knowledge of theory recent article about the three types of ATTACHMENT 1 about a comfort balance... Not change the lockout temps that were completely in favor of the normally closed lock-out Relay R-1 using Services. Right now it ’ s 33° outside according to the outdoor temperature drops on cold. In your browser before proceeding is where you can set a lockout temperature manually in the 40! From operating too soon after shut-down to allow internal pressures to equalize your. Temperature below which it is inefficient to run the furnace lock-out ( e.g equipment, too the back the. Year and i am not in the business of any trade i give advice on compressor ) lockout for! Interrupts the Aux control wire between stat and air handler, even more for 20 SEER equipment 's to! To go and it ’ s using the gas furnace as my emergency heat would! If it 's because the outdoor temp in the equipment, too of time the compressor remains between.

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