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Control theory and action description on air compressor group (with control box)
◆ System Control : Summer Cooling : Convert switch to " summer ", when the temperature detected by the sensor is higher than set value, the electric control valve runs by way of proportional plus integral, the flow increases, conversely, when the temperature detected by the sensor is lower than set value, the electric valve runs by way of proportional plus integral, the flow decreases; winter heating: Convert switch to " winter ", when the temperature detected by the sensor is lower than set value, the electric valve runs by way of proportional plus integral, the flow increases; contrary, the flow decreases .
◆ Fan control:
A. when the fan power is small, you can start directly.
B. when the fan power is big, in order to avoid affecting the normal operation of other electrical equipments, adopt Y-△ to start.
C. variable voltage control and frequency control are available. In addition, fans links with fire.
◆ Damper Control: damper fully opens or closes, links with fan.
◆ Fire Control: Fire can receive signals from the fire control center.
◆ Linkage control : when centralized control box receives fire signal, the fan stops running, simultaneously, electric valve and fan valve close at the same time , when the fan starts, electric valve and damper start.
◆ Centralized control box : panel has functions of power supply, fan working, fan failure, fire and other display, fans start, stop and summer & winter system conversion. The system has thermostat, transformers and auxiliary electrical equipment installed in the control box , which greatly facilitates wiring installation. |
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Control theory and action description on combined air conditioner
◆ Figure system: combined air conditioner control system, this system is mainly composed of proportional plus integral temperature controller, temperature sensor installed in return duct, humidity sensor, cold/hot electric control valve, humidity control valve and driver. The controller is used to compare the temperature dected by the sensor and the humidity sensor with set temperature and humidity, output voltage signal according to comparison result, as to control the motion of electric control valve, keep the supply air temperature and humidity in the range of needs.
◆ The fan in the figure is controlled by the electronic control box, when a fire, the fan automatically cuts off the power, turns off the electric valve, electric air valve, when the fan starts a new air damper fully opens, the temperature controller power is turned on, the whole system is controlled; cut off the fan power, the fan stops and the new air damper closes, the electric valve closes. This system has pipes freezing measures, antifreezing temperature could be adjusted at 2 ~ 7 ℃, when the surface temperature of pipe reaches this point, the valve opens automatically to provide hot water to prevent pipe cracking . | |
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