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

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