If the compressor is running at 2nd stage you want reduced air flow.
TWO STAGE COMPRESSOR SYSTEM PRO II SIMULATION FULL
If the compressor is running at capacity you want full air flow. It is important to use the proper control however, as you want to match the fan (air flow) with the compressor. It is, in fact, done already in the industry. (5) I also noticed that ambient temperature sensor was removed and the end of the wires are connected. (4) Noticing W1 and L terminals are also not connected on the board in the outside unit, what are those for? (3) Any concern of reconnecting Y2 now after the second stage not being used for a few years? (2) Would this set up cause more frequent kick in of aux heat during winter? (1) How would not connecting Y2 affect power consumption during winter and summer? I would like to you ask you a some questions if you wouldn’t mind: Given you answer to Ben last September I now can assume that the second stage of the compressor has not been engaged as Y2 is not connected. I recently noticed that only 4 wires are connected to the circuit board inside the outdoor unit, they are R,C,Y1 & O. Three years ago a technician came rewire the system as we needed to relocate the outdoor unit slightly. I also have a Lennox HPXA19 with a matching Lennox variable speed handler. Thank you for your very informative article. We have a planned future article where we plan to devote the entire article to the modulating cooling systems. These are much more complex systems but they deliver more comfortable temperatures with added efficiency over the two-stage or single-stage systems. A VRF is exactly the same thing with a different name. The R stands for refrigerant and the last V stands for volume. A single-stage, on a call for cooling, will operate at 100% of capacity while the two-stage and the modulating systems have stages based on demand.Īn example of a modulating air conditioning system is a VRV or VRF system. The modulating system maintains more even temperatures closer to the desired set point while the two-stage system has a little more temperature swing and the single-stage has the biggest temperature swings simply because of how it operates. The following chart demonstrates the temperature swing characteristics of a modulating system, a two-stage system, and a single-stage system. Modulating vs Two-Stage vs Single-Stage Cooling Systems The modulating systems will offer more efficiency than ever in the future. The systems will be very efficient and save lots of money on utility bills, which what the two-stage scroll compressors do now. These types of systems are already available in commercial refrigeration and mini-split air conditioners and heat pumps. The whole HVAC system of the future will be able to modulate based on demand. The compressor will have an ECM motor controlling the speed of the compressor, and the modulation will be somewhere from 25% to 100% of capacity. There will come a day soon when modulating compressors are the king of the day just as two-stage scroll compressors are now. So now, nearly every HVAC manufacturer is using the two-stage compressor for staging in their higher efficiency equipment. The plate has two holes drilled in it - one big hole for high demand and one small hole for low demand.Ī solenoid is used to shift that plate for whatever mode is called for from the thermostat. An engineer figured out that you can put a plate in the compressor. The controls are not complicated, and a single compressor can now be used for staging the air conditioner or heat pump. Cooling for both the air conditioner and heat pump for the cooling season. A standard single-stage compressor will kick on when the thermostat calls for heating or cooling. Then HVAC manufacturers began using scroll compressors and later an engineer figured out that the design of the scroll compressor can easily be modified to allow for a simple way to stage the compressor for low and high demand situations whenever it is needed.
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