The Johnson Controls WTL-PD2-00 Wireless Pneumatic Differential Air Thermostat is a temperature-control device designed to regulate heating and cooling operations in compatible HVAC systems. It monitors changes in room temperature and communicates control signals wirelessly to the associated pneumatic control equipment, helping maintain the desired indoor conditions. This thermostat i... https://www.partshnc.com/wtl-pd2-00-johnson-controls-wireless-pneum-da-htcl-stat