The THERMOSTAT DC 0-10V T6634-TE21-9JS0 is a DC 0-10 V modulating room thermostat.
Model: T6634-TE21-9JS0
Type: DC 0-10 V modulating room thermostat
Brand: Honeywell (commonly sold under Honeywell or Honeywell Home)
Control output: 0–10 V DC
Use: Room temperature control in HVAC zone systems like fan coil units, variable air volume (VAV), or ventilation with variable fan speed
Unlike basic mechanical thermostats that simply switch on/off, this type sends a 0–10 volt DC control signal to control devices such as:
Variable speed fans
Actuators (modulating valves or dampers)
VAV controllers or building automation systems
PWM or DC-controlled HVAC equipment
