Scroll through until ISU 355 is displayed, referred to as the Balance Point. Default Value: ... Aux Heat Lock Out (Aux Heat Outdoor 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. It's not about efficiency or saving money. It would probably be more efficient to lower that to a little below freezing but I have set it at 35 before. "Outdoor Temperature Lockouts" - Compressor Lockout/Balance Point is set to 35F. The heat pumps economical balance point would be around 50°F. I would like it to use only gas furnace when it’s below 30° outside. 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 Heat Pump Compressor Lockout or (Balance Point) 0—no compressor lockout. Hi. This could be 0 or -10°F. Backup heat lockout Off. ATTACHMENT 1. Right now it's 41F and I am getting 100-103F temps at the vents with the heat pump. I am not in the business of any trade I give advice on. Good thing its not for money saving. Since it would need to operate at a COP of 3.6 just to break even with a 90% efficient gas furnace. 78J00-03E Prepared by September, 2006 Part No. Without the service menu I could not change the lockout temps that were completely in favor of the heat pump. Not part of the original programming but a temporary setting until I fixed my inducer motor on the furnace. You can set a lockout temperature manually in the Equipment menu of your thermostat. Mechanical lockout thermostats are not allowed. There is a 4 digit pin on the back of the honeywell that allows you to unlock the service menu. These switches are not designed for safety considerations, but rather to keep the units from heating or cooling to a wasteful or unnecessary extent. 37-38F is where you would want to swap over to gas. What does that setting mean exactly? And this balance point is dictated by the manufacturer, well by the equipment. A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. 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. Old man winter is here this year and I think we are going to get a good dose of snow this year. I replaced my inducer motor on my furnace a couple of years ago. Other values not accepted. Having to run a defrost cycle isn't uncommon at 30-35°. Lock out settings of below 35 F and above the thermal balance point are allowed. Cookies help us deliver our Services. For a better experience, please enable JavaScript in your browser before proceeding. I have my heat pump (compressor) lockout set for 40F. Since you don’t have AUX heat, Heat Pump Balance won't appear as an option. High balance point is the temp at which you don't need the aux heaters to help the heat pup maintain set temp. I have the heat pump lockout @ 40F and the Furnace @ 45F right now. 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. 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. 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. Compressor Minimum Cycle Off Time: The amount of time the compressor remains off between cycles. Balance Point (Compressor Lockout) 0 = Off integer from 5 to 65 degrees Fahrenheit in only 5 degrees increments. Helping You to Do It Yourself! Source-1 3024-6881/D or similar) doesn't require a special stat. Other values not accepted. Since it would need to operate at a COP of 3.6 just to break even with a 90% efficient 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. Heatpumps can just fine when there's snow, no need to shut it down. Presuming you use 290 KWHs a month on without using any heat. By using our Services or clicking I agree, you agree to our use of cookies. At the same time, decreasing temperature means less heat in the air for a heat pump to pump indoors. @Joe, an outdoor lock-out (e.g. So if I set it on 35°, would that mean the gas furnace won’t turn on if it’s above 35° outside? 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 ° … Heat Pump Balance controls AUX heat. The OAT will lockout stage 3 (strip heaters ) if OAT is above the balance point. 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. 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'. 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