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