Siemens Industry, Inc. POWERS ™ CONTROLS Technical Instructions Document No. 155-065P25 TH 192-1 March 23, 2018 TH 192 S Single Temperature Room Thermostat Description The TH 192 S thermostats are proportional single output, single setpoint, 1-pipe (low air capacity) or 2-pipe (high air capacity) sensor controllers. Each thermostat includes a wall mounting plate for installation in a variety of rough-in terminal boxes. A sensitive bimetal responds to temperature change to modulate control air through a flapper nozzle. One setpoint dial is provided. 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 (provided with the TH 192 rough-in terminal box or optional accessories) that slide into the wall mounting plate. Features • Direct and reverse acting models for one- and two-pipe. • Fahrenheit or Celsius setpoint dials. • Highly sensitive bimetal thermostatic element. • Field adjustable sensitivity with graduated scale. • Integral field adjustable limit stops. • Control pressure test port accessible without removing cover. • Easily replaceable thermometer, setpoint dial, filters, and restrictor plate. • Covers available for concealed or exposed thermometers and for either concealed, key, or exposed knob adjustment and setpoint indication. • Standard plastic thermostat covers provide Desert Beige or white finish. Optional Design Features • Fixed temperature limit stops meet government specifications. • Competitor adapter mounting kits available. • Metal covers available in standard configurations with Desert beige finish. • Some thermostat chassis are available with optional 1/2-inch, large setpoint adjustment knobs.Technical Instructions Document Number 155-065P25 March 23, 2018 Page 2Siemens Industry, Inc. Application TH 192 S thermostats are temperature sensing devices that control pneumatic valve and damper actuators in heating and cooling applications such as air conditioners, space heaters, unit ventilators, and air volume controllers. The thermostats maintain energy management (maximum economy) and occupant comfort. TH 192 S thermostats are available with covers that conceal or expose the setpoint adjustment dial. Use TH 192 S 1-pipe thermostats with an external restrictor (20 scim, 5.4 ml/sec) where a limited air capacity operates a single valve and/or actuator. Use TH 192 S 2-pipe thermostats where multiple valves and actuators, used with or without high/low limiting controls, require higher air capacities. Figure 1. Typical TH 192 S Thermostat Applications. Piping Figure 2. TH 192 S One-Pipe Thermostat Connections. Figure 3. TH 192 S Two-Pipe Thermostat Connections.TH 192 S Single Temperature Room ThermostatTechnical Instructions Document Number 155-065P25 March 23, 2018 Siemens Industry, Inc.Page 3 Product Numbers and Ordering Information See Table 1 for product number and ordering information on TH 192 S thermostat chassis. 1. Is a one-pipe (low air capacity) or two-pipe (high air capacity) connection required for application? 2. Is a Fahrenheit or Celsius scale required? Chassis 3. Is the control action direct or reverse acting? a. Direct acting: An increase in temperature increases the control air pressure. b. Reverse acting: An increase in temperature decreases the control air pressure. 4. Where is setpoint adjustment knob located? a. Adjustment knob located at bottom of chassis. b. Adjustment knob on front with 1/2-inch, large exposed knob. Table 1. TH 192 S Thermostat Chassis Part Numbers. Chassis with Wall Plate Setpoint Adjustment Connection Type FahrenheitCelsius Direct Acting Reverse Action Direct Acting Reverse Acting Exposed at Bottom of Cover Two-pipe, relay 192-202192-203192-222192-223 One-pipe, non-relay 192-200192-201192-220192-221 Exposed 1/2” Knob on Cover * Two-pipe, relay 192-202K 192-203K 192-222K 192-223K One-pipe, non-relay 192-200K——— * This feature requires a key setpoint adjustment cover (or key type cover). See Table 2.Technical Instructions Document Number 155-065P25 March 23, 2018 Page 4Siemens Industry, Inc. Covers See Table 2 for product number and ordering information on TH 192 S thermostat covers. 1. Is the setpoint adjustment exposed for customer adjustment or concealed to prevent alteration of setting? 2. Is the thermometer exposed or concealed? 3. Is the setpoint indication exposed or concealed behind cover? 4. Is a plastic or zinc cast metal cover required? a. Plastic covers order 192-2XX. b. Metal covers order 192-3XX. 5. Is finish of cover standard or optional? The standard finish color for plastic and metal covers is Desert Beige. • For white plastic cover option, add “W” suffix code to cover part number (for example: 192-256W). See Table 2. Table 2. TH 192 S Thermostat Cover Part Numbers. Setpoint Adjustment Cover ConfigurationCover Part Number (See Note 2) Thermometer Setpoint Indicator Plastic Cover Desert Beige Metal Cover Desert Beige ConcealedConcealedConcealed192-256192-356 Exposed192-254192-354 Key (See Note 1) ConcealedExposed192-265192-365 Exposed192-266192-366 ExposedConcealed192-250192-350 Exposed192-252192-352 1. Key setpoint adjustment cover required for all thermostat chassis with optional 1/2” large setpoint adjustment knobs. 2. To order a plastic cover with white finish, add the "W" suffix code.TH 192 S Single Temperature Room ThermostatTechnical Instructions Document Number 155-065P25 March 23, 2018 Siemens Industry, Inc.Page 5 Specifications Control actionSee Table 1. Operating range45 to 85°F (7 to 30°C) Supply air pressure, maximum30 psi (207 kPa) Normal air supply pressure18 to 25 psi (124 to 172 kPa) Sensitivity adjustment1 to 4 psi/°F (12 to 50 kPa/°C) Nominal air consumption One-pipe25 scim (6.8 ml/sec) Two-pipe20 scim (5.5 ml/sec) Temperature Storage temperature-10 to 140°F (-23 to 60°C) Ambient operating temperature40 to 140°F (4 to 60°C) Temperature response0.1°F (0.06°C) Dial graduations2°F (1°C) Factory settings Calibration @ 72°F (22°C)7.5 psi (52 kPa) Sensitivity2.5 psi/ ° F (31 kPa/ ° C) Limit stop adjustment45 and 85°F (7 and 30°C) Standard coverCycolac, desert beige Shipping weight0.7 lbs. (0.3 kg) DimensionsSee Figure 4. Accessories See the following Technical Bulletins for information on accessories. Technical Bulletin TB 237 Terminal Kits TB 214 Adapter Kits TB 193 Guard Kit TB 241 Test Head Kit TB 167 Restrictors Document Number 155-244 155-231 155-222 155-255 155-213 Dimensions Figure 4. TH 192 S Dimensions in Inches (Millimeters).Technical Instructions Document Number 155-065P25 March 23, 2018 Page 6Siemens Industry, Inc. Operation In the TH 192 S direct acting thermostat, an increase in temperature increases the control air pressure and a decrease in temperature decreases the control pressure. In the TH 192 S reverse acting thermostat, an increase in temperature decreases the control air pressure and a decrease in temperature increases the control pressure. Figure 5. TH 192 S Input/Output Characteristics. TH 192 S Thermostat Details Figure 6. TH 192 S Thermostat Details. Thermometer Calibration 1. Use a test thermometer to read the current room temperature. 2. Place a screwdriver in the center of the thermometer assembly (See Figure 6). Carefully rotate thermometer assembly until pointer tip indicates the correct room temperature. NOTE:Avoid breathing on or touching the bimetal spiral since this affects the temperature reading.TH 192 S Single Temperature Room ThermostatTechnical Instructions Document Number 155-065P25 March 23, 2018 Siemens Industry, Inc.Page 7 Limit Stop Adjustment Thermostat limit stops define the minimum and maximum thermostat setpoints. The limit stops engage in the setpoint cam gear teeth and cause interference between the setpoint cam gear and the adjustment knob gear. To change limit stop settings, use needle nose pliers to pull limit stop between the setpoint cam gear teeth. Rotate limit stop to its new position. Do not pull limit stop any more than necessary to clear the gear teeth. Changing the limit stop position one gear tooth changes the limit stop setting by 1-1/3 ° F (0.7 ° C). Figure 7. TH 192 S Limit Stop Adjustments. Sensitivity Adjustment To change thermostat sensitivity, use a flat-blade screwdriver to carefully move the sensitivity slide to the desired position as follows: Figure 8. TH 192 S Sensitivity Adjustment. Graduation closest to the rigid end of the bimetal element 4 psi/ ° F (50 kPa/ ° C) Graduation closest to the minimum (MIN) end of the bimetal element 1 psi/ ° F (12 kPa/ ° C) NOTE:If the thermostat sensitivity is adjusted, the thermostat must be recalibrated. Thermostat Calibration The thermostat is factory calibrated to a control pressure of 7.5 psi (52 kPa) when the setpoint and the ambient temperature are both at 72°F (22°C). The factory sensitivity setting is approximately 2.5 psi/ ° F (31 kPa/ ° C). No adjustments are required if these settings are appropriate for the application. If the thermostat has been tampered with, the sensitivity changed, or is out of adjustment, use the following steps to recalibrate the instrument.Technical Instructions Document Number 155-065P25 March 23, 2018 Page 8Siemens Industry, Inc. Step 1— Remove cover using 192-632 calibration tool. Verify room temperature is between 70 and 80 ° F (21 and 27 ° C). Step 2— Verify that supply pressure is 18 psi (124 kPa). Set dial to room temperature by turning the exposed adjustment knob or using a hex key as shown. Allow thermostat to stand for about five minutes to adjust to the new setting. Step 3— Moisten needle and insert 192-633 test gauge and needle adapter in a test port. Read control pressure. Step 4— If control pressure does not read 7 to 8 psi (48 to 55 kPa), turn calibration screw using 192-632 calibration tool or 1/8” (3.2 mm) wrench until pressure is 7 to 8 psi (48 to 55 kPa). The sensing element is now in calibration and the setpoint can be changed to the desired room temperature.TH 192 S Single Temperature Room ThermostatTechnical Instructions Document Number 155-065P25 March 23, 2018 Siemens Industry, Inc.Page 9 Troubleshooting Before troubleshooting thermostat per Table 3, make certain there is clean dry supply air at 18 psi (124 kPa) minimum. Use test probe gauge and needle adapter to measure control pressure at thermostat test port. The output pressure test port is accessible without removing the thermostat cover through the 8th opening from the top. For one-pipe thermostats, the port is on the right side. For two-pipe thermostats, the port is on the left side. Figure 9. Accessing Output Pressure Test Port.Next >