TH 192 HC Heating/Cooling Room Thermostat Technical
Instructions
Document Number 155-066P25
October 26, 2010
Siemens Industry, Inc.
Page 5
Accessories
See the following Technical Bulletins for information on accessories.
Technical Bulletin
TB 237 Terminal Kits
TB 213 Aspirator Wall Box Kit
TB 214 Adapter Kits
TB 193 Guard Kit
TB 241 Test Head Kit
TB 167 Restrictors
Document Number
155-244
155-245
155-231
155-222
155-255
155-213
Dimensions
Figure 3. TH 192 HC Dimensions in Inches (Millimeters).
Operation
Heating-Cooling
Operation
The TH 192 HC thermostat combines direct or reverse acting heating control with direct
or reverse acting cooling control. In direct acting control, an increase in temperature
increases the control air pressure and a decrease in temperature decreases the control
pressure. In reverse acting control, an increase in temperature decreases the control air
pressure and a decrease in temperature increases the control pressure.
The TH 192 HC provides two separate bimetal elements; one for heating mode control
and one for cooling mode control. Each bimetal element operates independently of the
other. Use of two different supply air pressures accomplishes changeover from heating
to cooling modes. A supply pressure of 18 psi (124 kPa) or 25 psi (172 kPa) positions a
changeover switch so a changeover relay operates in the cooling or heating mode
respectively.
Figure 4. TH 192 HC Input/Output Characteristics.
