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控制回路分類(lèi)說(shuō)明通風(fēng)基本協(xié)調(diào)室外、回風(fēng)和排氣擋板的操作，以保持適當(dāng)?shù)耐L(fēng)量。通常需要低溫保護(hù)。更好地測(cè)量和控制室外空氣量，以在不同的室內(nèi)條件下提供室外空氣和回風(fēng)的適當(dāng)混合（在可變風(fēng)量系統(tǒng)中至關(guān)重要）?？赡苄枰蜏乇Ｗo(hù)。冷卻冷卻器控制將冷卻器排放水保持在預(yù)設(shè)溫度或根據(jù)需要重置溫度。冷卻塔控制裝置控制冷卻塔風(fēng)機(jī)，以在現(xiàn)有濕球溫度條件下提供冷的水。水盤(pán)管控制調(diào)節(jié)冷凍水流量以保持溫度。直接膨脹（DX）系統(tǒng)控制循環(huán)壓縮機(jī)或DX線圈電磁閥以保持溫度。如果壓縮機(jī)為卸載式，則根據(jù)需要卸載氣缸以保持溫度。Fan Basic在占用期間開(kāi)啟送風(fēng)機(jī)和回風(fēng)機(jī)，并在空閑期間根據(jù)需要進(jìn)行循環(huán)。更好地調(diào)整風(fēng)扇體積，以保持適當(dāng)?shù)墓艿篮涂臻g壓力。降低系統(tǒng)運(yùn)行成本并提高性能（對(duì)于可變風(fēng)量系統(tǒng)至關(guān)重要）。加熱盤(pán)管控制調(diào)節(jié)水或蒸汽流量或電熱以保持溫度。鍋爐控制操作燃燒器，以保持適當(dāng)?shù)呐欧耪羝麎毫蛩疁?。為了使熱水系統(tǒng)達(dá)到大效率，應(yīng)根據(jù)需求或室外溫度重置水溫。
Control Loop Classification Description Ventilation Basic Coordinates operation of the outdoor, return, and exhaust air dampers to maintain the proper amount of ventilation air. Low-temperature protection is often required. Better Measures and controls the volume of outdoor air to provide the proper mix of outdoor and return air under varying indoor conditions (essential in variable air volume systems). Low-temperature protection may be required. Cooling Chiller control Maintains chiller discharge water at preset temperature or resets temperature according to demand. Cooling tower control Controls cooling tower fans to provide the coolest water practical under existing wet bulb temperature conditions. Water coil control Adjusts chilled water flow to maintain temperature. Direct expansion (DX) system control Cycles compressor or DX coil solenoid valves to maintain temperature. If compressor is unloading type, cylinders are unloaded as required to maintain temperature. Fan Basic Turns on supply and return fans during occupied periods and cycles them as required during unoccupied periods. Better Adjusts fan volumes to maintain proper duct and space pressures. Reduces system operating cost and improves performance (essential for variable air volume systems). Heating Coil control Adjusts water or steam flow or electric heat to maintain temperature. Boiler control Operates burner to maintain proper discharge steam pressure or water temperature. For maximum efficiency in a hot water system, water temperature should be reset as a function of demand or outdoor temperature.
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