When the filter infarction or when its value beyond the rules, given the pressure switch switch signal. When demand for cooling, refrigeration thermostat placed in the form, when the temperature sensor measurements at or below the set temperature, the thermostat valve to the electric signal a closed valve, close the valve contacts the valve is turned on the electric valve closed . If the measured temperature does not reach the set temperature air conditioning unit, the thermostat valve is an open valve to the electric signal, the electric valve open contacts connected valve open. Heating demand when air conditioning units, heating thermostat placed in the form of rooftop air conditioning unit, when the temperature sensor reaches or higher than the set temperature, the thermostat valve to a closed valve electric signal and closing the valve contacts the valve closed electric valve is turned on. If the measured temperature does not reach the set temperature tank air conditioning units, thermostat valve is an open valve to the electric signal, the electric valve open contacts connected valve open. Performance guarantees; 1, coil (cooler, heater) according to the American Association of air conditioning and refrigeration ARI standard design, the use of imported brass strings aluminum heat exchanger production line, high efficiency heat exchange coil, wind resistance, water resistance is small. There are around a heater pipe aluminum (steel), steel and aluminum (copper and aluminum) composite pipe available. 2, the fan with advanced air-conditioning for excellence KF series double inlet centrifugal fan, wide high efficiency, low voice, head range. Modular air conditioning units, air conditioning units, Chongwen District, Chen Yu-conditioning services provided by Wu Cheng Chen Yu Air Conditioning Equipment Co.. Wu Cheng Chen Yu Air Conditioning Equipment Co., Ltd. (www.wccykt.com) strong, credible, in Dezhou fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Chenyu air conditioning and you hand into the brilliant, for a better future!