Honeywell | 8C-TDODA1 51307149-175 Module | Original Package

Honeywell | 8C-TDODA1 51307149-175 Module | Original Package

COOLING EQUIPMENT

An air handling system cools by moving air across a coil containing a cooling medium (e.g., chilled water or a refrigerant). Figures 10 and 11 show air handling systems that use a chilled water coil and a refrigeration evaporator (direct expansion) coil, respectively. Chilled water control is usually proportional, whereas control of an evaporator coil is in two positions. In direct expansion systems having more than one coil, a thermostat controls a solenoid valve for each coil and the compressor is cycled by a refrigerant pressure control. This type of system is called a “pump down” system. Pump down may be used for systems having only one coil, but more often the compressor is controlled directly by the thermostat.

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