Tag: T4039A

Honeywell T4039A Line Voltage Thermostat  INTRODUCTION T4039 Thermostats Control Line Voltage Valves of a fan coil unit in cooling, manual changeover heating-cooling, or automatic changeover heating-cooling systems. One or two valves may be controlled directly by the thermostat. The fan switch (where applicable) controls air circulation. 1-, 2-, or 3-speed manual fan control available. Positive…