Weak current College】 【Central air conditioning system monitoring-Power By】 【China power house network.

<br> Fan-coil control typically include fan speed control and indoor temperature control in two parts. <br> <br> First, the fan coil system of monitoring points <br> <br> 1, indoor temperature measurement; <br> .<br> 2, cold, hot water valve switch control; <br> <br> 3, fan speed and commitment control. <br> <br> Second, fan-coil system of monitoring function description <br> <br> 1 ., fan speed and commitment control <br> <br> To adjust the volume, at present, almost all of the blower fan coil are high, medium, and low in third gear for fan speed control. Commitment control, air conditioning are usually user .manual control in place. <br> <br> 2, room temperature control <br> <br> Room temperature control is a completely negative feedback temperature control system. It consists of a room temperature controller and electric valve, by regulating the amount of .cold and hot water without changing the coil cooling or heating capacity, control the indoor temperature. Most of the fan coil is shared between summer and winter. Therefore, in its thermostat with winter and summer conversion measures. Winter conversion measures have manually and automatically in .two ways, depending on the system and usage requirements. <br> <br> A manual conversion, temperature controller. Set in various temperature controller, making the summer and winter switch when cooling, heating in winter time. <br> <br> .B, automatic conversion. To automate the conversion, you must automatically distinguish between water system the current operating mode. When the water system for cold water, you should go to summer conditions; when the system heating water, you should go to winter conditions. .To do this, on each fan coil water supply pipe sets a bit type temperature switch, its actions are: for cold water is 12 ° c, heating water is 30-40 ° c, this enables the automatic conversion requirements. <br> < .br> Fan-coil temperature control, a control and proportional control. The former characteristic is simple equipment, less investment, control convenient and reliable, the disadvantage is that control accuracy is not high, the latter control precision is high, but it requires the .thermostat must have P or PI function, electric water valve should use adjustable instead of double-bit type. As a result of the relatively large size of the investment. Currently, most projects are using bit-control mode, only a few demanding regional or .fan-coil model is large, consider using proportional control. <br> <br> No matter what kind of control, the thermostat should be located in the Interior of region or location, should not be near sources of heat, light and away from .the venue staff activity. Three-speed switch is located in the convenient location of human action. <br> <br> 3, interlocking control <br> <br> Fan stops and the electric water valve interlocks. When the room is equipped with .a key switch, from energy-saving considerations, fan-coil with key lock switch interlocking. <br> <br>.