192-224 : Siemens TH 192 DN Pneumatic Thermostat, Direct Acting, 2 or 3 Pipe, Day/Night, °C

Siemens 192-224 Model TH 192 Day & Night thermostat is a Direct acting, proportional, single output, dual set point, 2-pipe or 3-pipe (high air capacity) sensor controllers. Each thermostat includes a wall mounting plate for installation in a variety of rough-in terminal boxes. Air connections are made with 5/32” (4 mm) O.D. plastic tubing, directly to the thermostat chassis for retrofit applications, or with plug-in adapters.

Features:
· Direct and reverse acting for day and night modes (DN models).
· Two separate, adjustable temperature setpoint indicating dials.
· Two highly sensitive bimetal thermostatic elements.
· Operating mode automatically switches from day to night on change of main air
supply pressure.
· Manual override selector ensures off-hour occupancy comfort.
· Single screw adjustment for changeover switch setpoint.
· Individual field adjustable sensitivity with graduated scale for each mode.
· Integral field adjustable limit stops.
· Control pressure test port accessible without removing cover.
· Easily replaceable thermometer, setpoint dials, filters, and restrictor plate.
· Fahrenheit or Celsius setpoint dials.
· Covers available for concealed or exposed thermometers and for either concealed, key, or exposed knob adjustment and setpoint adjustment