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1756-L62S
1756-L62S
3.3除霜控制
冬季机组做热泵运行时，特别是当环境温度接近0℃或低于0℃时，机组将出现结霜状况。除霜时采用互锁控制，避免温度波动过大，即系统1进入除霜时，系统2不能同时进入除霜，系统3进入除霜时，系统4不能同时进入除霜；除霜时投必要的电加热。当机组进入制热工况后，低温低压的制冷剂进入翅片换热器，盘管温度不断下降，吸气温度也随着下降，当盘管温度下降到设定值时，并且除霜周期已到，plc控制四通换向阀换向进入除霜模式，同时停止冷凝风机，启动电加热器；当蒸发器盘管温度上升到设定值，或除霜执行时间到达设置的最长除霜时间，四通阀换向，除霜结束，电加热停止运行，机组又进入制热工况，如此循环下去。
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