Thermostats of this family may be easily identified by referring to the part number located on the carton and on the back and side of the device. Stamped on the back of the device is the date of manufacture (four digits, the first two representing the week of the year and the last two representing the year). These thermostats are used for proportional control of pneumatically activated valves, dampers and similar devices in heating, ventilating and air conditioning systems. See Performance table.
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