The AC is 2.5 tons. If critical zones are served by the AHU system, the system should be capable of meeting the zone loads at the reset SAT. Tag: Heating troubleshooting. They would put a larger air handler inside and the smaller condenser outside. It’s a good idea to hire a pro to address any thermostat- or furnace-related problems. 301-799-7200. Only upon performance verification is a certification symbol applied to HVACR products … I would get the thermostat that is meant to work with the furnace to get the most efficiency out of both. The Lennox outdoor unit and indoor coil has a 10yr parts, 10yr compressor, 1 … Even modern high-tech wifi or "learning" thermostats operate on principles similar to the classic older dial thermostats. A system that contains mismatched coils isn’t something that Pedro Portillo, president and lead service technician of ACU Air Heating and Air Conditioning, Conroe, Texas, likes to see. Inspection AC report said that main unit is mismatched. Your air conditioner’s indoor and outdoor units must be designed to work together. That is fine. it must be compatible with outdoor unit. Typically, to get the maximum efficiency from the AC, you need to upsize the indoor coil by a couple of sizes and install a TXV. Reply; Reply with quote; Nov 15th, 2017 5:05 pm #8; Kevinck [OP] Deal … 0 0. What does an air conditioner do? I'll try to be as succinct as possible.. Air-side systems with cooling-only zones (electrical rooms, telecommunications closets, etc.) You Can Search Our Site for More Troubleshooting Problems, Heating, Air Conditioning Parts and Supplies in the Google Seach box below. Since 1928, Armstrong Air has been the smart choice for homeowners who expect more from their heating and cooling system. The entire HVAC system will suffer if mismatched components are pieced together. All Topics Topic Home & Garden Heating & Air Conditioning » Mismatched compressor & air handler = big trouble decycled Posts: 1, Reputation: 1. Prior to this, the air handler had been replaced in 2004, and the condenser in 2002. A mismatched system may also break down sooner; What are some signs that I need a new HVAC system? An air conditioner’s evaporator coil is located indoors, next to the air handler. Here are some factors to consider, as well as the benefits of avoiding a mismatched furnace and air conditioner. only the three wires? The problem with mismatched HVAC systems is that they are just that…systems. Repairs and Maintenance; Energy Efficient Installation; 24-Hour Emergency Service; New Installations; VIP Service Plan; Resources. After all, you can’t run your air conditioner or heater unless you have a way to communicate with it—and that’s the job of the thermostat. I moved into my house in 2005. Got a few estimates from local HVAC companies and it turns out that my furnace is grossly mismatched to the AC--I don't recall the furnace parameters, but it's twice what they'd recommend for my 1600 st ft house. LENNOX MINI-SPLIT SYSTEMS SERVICE MANUAL Lennox Mini-Split Service Manual PDF is here if further troubleshooting is needed.. LENNOX SERVICE MANUAL FOR ROOM AIR CONDITIONER (Inverter Split-Type) PDF is here. I do this all the time for Energy Audits and HERS Ratings. This may not work as designed, even if it is the same size equipment. You see, mismatched coils put extra stress on your AC system. One will blame the other. Air Conditioning and Cooling Systems - Mismatched air handler/condensing unit. Get part numbers from both units for when you call. The Lennox Air Conditioning system is a part of my heating system which makes it a great combination. So if I understand this correctly, you CAN put a 3 ton coil and condenser on a 5 ton air handler. These two parts are specifically designed to work together as a coordinated “team” to provide top performance and maximum efficiency and comfort. Here are the most important questions to answer prior to making your decision: How old is your furnace? Manual is applicable only to the following models – LNIV2610, LNIV3510, LNIV5010, LNIV6510. Mismatched air conditioning systems are more than 30% less efficient and can cause undue stress on the entire HVAC system. And the following issues may arise. If you have a mismatch and the furnace acts up, will you call Ecobee or Lennox? The chemical coolant travels through the coil and then into a device that decreases the chemical’s pressure. From there, the chemical coolant becomes a low pressure gas and it temperature hovers just above the point of freezing. Thanks for your help. The problem you find a lot is that the outdoor unit is replaced and the old indoor coil is not. 5 months ago. It transfers the heat to the outdoors. Categories: customer service, FAQs, Furnace draft inducer problems, Instructions, Problems With Answers, troubleshooting, Videos. Problems Associated with Mismatched Systems. Services . require consideration of these critical zones, as they may prevent the air handling unit (AHU) system from resetting the supply-air temperature (SAT). The indoor unit has a coil number. Here’s a guide to pinpointing your problem: According to the Air Conditioning, Heating and Refrigeration Institute (AHRI), mismatched systems are at least 30 percent less efficient than matched systems. I discuss why I think Mismatched systems are a compromise at best. Mismatched Manufacturers is not recommended but may not be wrong. Having a working thermostat in your home is critical. The indoor unit is 20 years old, 14 Seer condenser, 10 Seer airhandler. Replacing your Central Air Conditioning or Heat Pump System Split air conditioning and heat pump systems typically consist of two parts: an indoor (coil) unit and an outdoor (condensing) unit. Put the white on Y on your Nest thermostat and see if it works. Decreased system lifespan. - I had what I thought was a new Goodman 12 seer, 3 ton heat pump full system installed last November. An air conditioner and furnace is a popular matched system in the Northeast, the Midwest and some places in the South. makes me think this is an a/c only system and your heat source is something else [the RH terminal is usually for heating]. When incompatible components are added into the HVAC system, if significantly affects the efficiency and lifespan of the furnace or AC. I … Built with durable materials and incorporating brilliant technology throughout, Armstrong Air is not only the brand to trust with your home comfort, it’s also the brand more dealers would choose for themselves. The "matched" combination usually performs at the lowest rated efficiency -- 13 or 14 SEER. And they told me that my furnace is sized for a 5 ton AC. The furnace connection should supply at least 10.5 volts DC and not exceed 14.5 volts DC at the furnace; AC voltage should be between 105 volts and not exceed 135. Do plan for lowest fluid temperatures: In most hydronic heating systems expansion tank size and air side pressurization is based the assumption that the cold fluid used to fill the system in the temperature range of 45F to 60F. Signs of a Mismatch . Decreased Lifespan In the case of mismatched equipment, Call either Mfg and they will tell you if this voids warranty. Spock (rhp) Lv 7. At some point developers figured out that if a home was a little larger than a 2 ton but not quite a 2 1/2, they could mismatch the unit sizes. Refer to your owner's manual for specific model limits prior to changing power sources. For instance, if you choose a high-efficiency air conditioner with a SEER rating above 16 and your furnace has an old blower motor, you are using a mismatched system which will sacrifice some efficiency. Although it’s possible to mix and match the systems, it’s not recommended, especially if the furnace is over 15 years old. But you can troubleshoot your thermostat and furnace before calling a pro. New Member : Oct 13, 2009, 12:50 PM Mismatched compressor & air handler = big trouble. But it would seem to be beyond SOP for a Home Inspection. The breaker will trip once every 80 start cycles...happens maybe 3 times a year during the summer time when we use the AC. Check the voltage if the blower does not work; a tripped circuit breaker is a common result of mismatched voltage. Posted on August 28, 2012 February 25, 2020 by Steve Arnold — 220 Comments … The minimum has been 10 since 1992, and 13 since 2006. There is no way a 15 year old system would be 7 SEER. For an air conditioning or heat pump system to provide proper comfort, efficiency and operation, it is very important for all the components to be matched and sized properly. Points to Ask When Thinking Over Air Conditioning Replacement and Furnace Replacement at the Same Time. I have gotten mixed information with local HVAC guys and need to figure this out. Unit has a water leak and low on freon, possibly due to the mismatch with the 1.5 ton unit. Parts of an Air Handler . Connected to the inside cooling coil, the compressor pumps refrigerant back and forth, extracting heat and moisture from the indoors. The Government cannot give to anybody anything that the Government does not first take from somebody else. The vast majority of standard forced air furnaces or furnace/ AC units are controlled by low-voltage thermostat units mounted somewhere in the house, usually in a central location. The air is very cold but the system stalls from time to time, probably because the condenser coils are too much for the evap coils. 1 Homeowners should keep this efficiency loss in mind when they are considering replacing only the outdoor unit portion of their split system. They work and perform best when the components indoors and outdoors match. So I have 5 ton Lennox gas furnace and air handler which is really too large for my house and just came upon a brand new 3 ton goodman condenser and coil for great deal. In this case, Weatherking/Rheem may fly. The gas can then absorb heat from the air that travels across the coils. Air Conditioner + Furnace Matched Systems. HVAC: Mismatched coils, should I replace AC? An under- or over-heated home or an unresponsive thermostat is a common sign of a mismatched thermostat and furnace. If AC does not work with the current wiring, find the yellow wire. If the AC works with the old thermostat, the colors are just mismatched. This information is available at ahridirectory.org. According to the Air Conditioning, Heating and Refrigeration Institute, when AC coils are improperly matched, “the efficiency and longevity of these systems are significantly compromised”. Beware the Mismatched Thermostat and Air Conditioner! An AHRI-matched system is recorded by AHRI as a properly matched system. If you thi. FYI the "mismatch" sized unit thing is both not uncommon and not a very large problem. “A system that is properly matched will operate at its fullest efficiency, providing the customer with a more comfortable environment at a lower operating cost,” he said. Outdoor unit is mismatched efficiency and Lifespan of the furnace or AC furnace! Properly matched system in the case of mismatched equipment, call either and. Is critical smart choice for homeowners who expect more from their heating and cooling system or! Not recommended but may not work as designed, even mismatched furnace and ac it is the size! 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