表中双接点连接导线为：接点2为下限设定点，接点1为上限；设定点，接点3为公共端。
Leads of single double contacts: lower limits is contact 2, upper limits setpoint is contact 1, contact 3 is public port.
表中双接点连接导线为：接点2为下限设定点，接点1为上限；设定点，接点3为公共端。
Leads of single double contacts: lower limits is contact 2, upper limits setpoint is contact 1, contact 3 is public port.
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