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[China]
Address: 25C Bilida Building, Siming District,Xiamen, Fujian, China.
Contact name:Trixie Tin
TLU Technology Co., LTD |
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Honeywell HC900 Controller 900A01-0102 Channel
HONEYWELL 51202330-300 A New And Original High Quality In Stock
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 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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Definitions
The following terms are used in this manual. Figure 1 at the end of
this list illustrates a typical control loop with the components
identified using terms from this list.
Analog: Continuously variable (e.g., a faucet controlling water from off
to full flow).
Automatic control system: A system that reacts to a change or imbalance in the variable it
controls by adjusting other variables to restore the system to the
desired balance.
Algorithm: A calculation method that produces a control output by operating
on an error signal or a time series of error signals.
