Tag: 521_D

  • tekmar 521_D Programmable Thermostat Instruction Manual

    tekmar 521_D Programmable Thermostat Instruction Manual

    tekmar 521_D Programmable Thermostat Introduction The Programmable Thermostat 521 is designed for three different modes of operation: single stage heating, two stages of heating with a fan, or one stage of heating and one stage of cooling with a fan. Two auxiliary sensors may be added to measure the floor, outdoor or room temperature. A…