Toshiba’s new SMMS-u maximizes comfort during heating with new individual defrost technology.
Frost impedes airflow through the heat exchanger, hence, it can reduce system efficiency and heating capacity. Therefore, during heating it is necessary to defrost air conditioning systems periodically.
With a general defrost method, the refrigerant cycle switches the hot refrigerant path to the outdoor heat exchanger. On the other hand, cooled refrigerant has to flow through the indoor unit’s heat exchanger resulting in a drop in room temperature.
New individual defrost technology in the SMMS-u performs defrost operations without a pause in heating. This works with a combination of 2 or more outdoor units. First, the path of the mid-temp refrigerant discharged from the low-stage compressor flows to the indoor units’ side for non-stop heating. The other path of refrigerant heats due to the high-stage compressor and defrosts the outdoor heat exchanger in a short time.
Toshiba’s algorithm adjusts the temperature of the mid-temp refrigerant that changes with the balance of the compressor speed to maintain a comfortable indoor environment while defrosting efficiently.