温度上限报警功能， 温度下限报警功能，上/下限温度可设定 ；
Nine, the upper limit temperature alarm function, temperature alarm function, the upper / lower limit temperature can be set;
温度低于下限，启动加热。
When temperature is less than lower limit, calefaction circuit starts.
系统进气孔温度低于下限临界阈值。
The system inlet temperature is less than the lower critical threshold.
系统进气孔温度低于下限警告阈值。
The system inlet temperature is less than the lower warning threshold.
系统进气孔温度低于下限警告阈值。
The system inlet temperature is less than the lower warning threshold.
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