If the air inlet opening is larger than the pad, place the pad so that excess open area is distributed uniformly around the pad. If the pad height exceeds that of the inlet, the pad should be set back from the wall opening a distance equal to half the height difference. Construct inlets so they can be easily closed without removing the pads. Three stages of control are preferable to meet the cooling requirements of most controlled-environment buildings. These stages are designed for hot, mild, and cold conditions.
Water is circulated through the pad system only during hot conditions.
Wire a control switch in parallel with each control stage to permit manual control when desired. Also, install a safety disconnect switch near each fan and pump. Locate thermostats at plant or animal height, if possible. Thermostats and other control sensors should be near the center of the room and away from unrepresentative hot or cold air streams. If the building is divided into zones, locate a control sensor near the center of each zone.