iO HVAC Controls Temp-Limiter 55 Degree Heat Only

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iO-TL55H TEMP-LIMITER (55 DEGREES HEAT ONLY) The internal limiter prevents space temperatures from exceeding 55° F regardless how high the thermostat is set. Control accuracy is +/- 2° F.  The Temp-Limiter is designed to be wired  between the room thermostat and the furnace. The limiter is located in an attractive, non-descript plastic, self-latching enclosure. The subbase has screw terminals for easy wiring of the furnace 'W' wire through the limiter.