Definition:

The selection of horizontal concealed fan coil units is mainly based on key control parameters such as rated airflow, outlet static pressure, input power, rated cooling capacity, rated heating capacity, noise level, and water resistance. For fan coil units in two-pipe water systems (suitable for air conditioning systems that switch between heating and cooling only by season or by air-conditioned area), only one set of coils is configured, making it a versatile model for both heating and cooling in winter and summer. For fan coil units in four-pipe water systems (suitable for air conditioning systems that frequently switch between heating and cooling), a combined model with two sets of coils—one for heating and one for cooling—should be configured.