I have been told the new Carrier Infinity Touch Control 8.0 allows for one zone in a system to be much smaller than others. Up until now, I have been told this was not possible with any existing Carrier system due to risks of the coil freezing when only the small zone is calling for cooling.
I am currently planning to go with the new Lennox icomfort zoning system and the new XC25 variable compressor which seems to be the best solution for this kind of application.
Upon telling this to the Carrier dealer, they suddenly had this "brand new to the market solution" from Carrier. I asked them how this was possible and they are not willing to explain. Here was their response:
The intellectual property that regulates the mechanics of how the system prevents the coil from freezing is proprietary to Carrier and that information is not shared with the field. From a process prospective the new control monitors CFM produced by reading the static pressure. It measures that value against the temperature of the coil based on refrigerant pressures using the T and P chart values, refrigerant flow and air temperature in the duct system. The data is used to regulate demand on the outside unit to balanced against the freezing of the indoor coil. This system has been in field testing for the last several years which is typical for Carrier. They will not release the product until it has performed satisfactorily in a wide variety of conditions. Their interest in constantly pushing the envelope to improve/expand the capabilities of their existing products as well as develop new ones is what has allowed them to maintain their leadership position in the industry for the last 7 years.
Any thoughts? I thought that since the compressor only has two stages, there is still a risk?