Siemens Powers TH 192 S Owner's manual

Powers®Controls
Technical Instructions
Document No. 155-065P25
TH 192-1
October 28, 2010
TH 192 S Single Temperature
Room Thermostat
80
70
TH0355R1
POWERS
6050 70 80
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 or white finish.
•Some thermostat chassis are available with optional 1/2-inch, large setpoint
adjustment knobs.
Siemens Industry, Inc.

Technical Instructions
Document Number 155-065P25
October 28, 2010
Page 2 Siemens 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.
R1
DA
DA
HOT
WATER
N.O. VALVE
CHILLED WATER
N.C. VALVE
S
EXTERNAL RESTRICTOR
1 - PIPE
DIAGRAM 1
R1
R1
RA
RA
CHILLED
WATER
CHILLED
WATER CHILLED WATER
N.O. VALVE
N.O. VALVE
HOT WATER
HOT WATER
N.C. VALVE N.C. VALVE
SS
S
EXTERNAL RESTRICTOR
1 - PIPE 2 - PIPE
DIAGRAM 2 DIAGRAM 3
R1
N.O. VALVE
HOT WATER
N.C. VALVE
S
S
2 - PIPE
DIAGRAM 4
NOTE: DOTTED LINES ARE ALTERNATIVE CONTROL SCHEMES.
TH0242R1
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 Thermostat Technical Instructions
Document Number 155-065P25
October 28, 2010
Siemens Industry, Inc. Page 3
Product Numbers
and Ordering
Information
Chassis
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?
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
Fahrenheit CelsiusSetpoint
Adjustment Connection Type Direct
Acting Reverse Action Direct Acting Reverse Acting
Two-pipe,
relay 192-202 192-203 192-222 192-223
Exposed
at Bottom
of Cover One-pipe,
non-relay 192-200 192-201 192-220 192-221
Two-pipe,
relay 192-202K 192-203K 192-222K 192-223K
Exposed
1/2” Knob
on Cover * 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
October 28, 2010
Page 4 Siemens 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.
a. For white plastic cover option, add “W” suffix code to cover part number
(for example: 192-256W). See Table 2.
b. For white metal cover option, add "H" suffix code to cover part
(for example: 192-356H). See Table 2.
Table 2. TH 192 S Thermostat Cover Part Numbers.
Cover Configuration Cover Part Number
(See Note 2)
Setpoint
Adjustment
Thermometer Setpoint Indicator Plastic Cover Desert Beige Metal Cover Desert Beige
Concealed 192-256 192-356Concealed Exposed Concealed 192-254 192-354
Concealed 192-265 192-365
Key
(See Note 1) Exposed 192-266 192-366
Concealed 192-250 192-350Exposed Exposed
Exposed
192-252 192-352
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. To order
a metal cover with a white finish, add the "H" suffix code.

TH 192 S Single Temperature Room Thermostat Technical Instructions
Document Number 155-065P25
October 28, 2010
Siemens Industry, Inc. Page 5
Specifications Control action See Table 1.
Operating range 45 to 85°F (7 to 30°C)
Supply air pressure, maximum 30 psi (207 kPa)
Normal air supply pressure 18 to 25 psi (124 to 172 kPa)
Sensitivity adjustment 1 to 4 psi/°F (12 to 50 kPa/°C)
Nominal air consumption
One-pipe 25 scim (6.8 ml/sec)
Two-pipe 20 scim (5.5 ml/sec)
Temperature
Storage temperature -10 to 140°F (-23 to 60°C)
Ambient operating temperature 40 to 140°F (4 to 60°C)
Temperature response 0.1°F (0.06°C)
Dial graduations 2°F (1°C)
Factory settings
Calibration @ 72°F (22°C) 7.5 psi (52 kPa)
Sensitivity 2.5 psi/°F (31 kPa/°C)
Limit stop adjustment 45 and 85°F (7 and 30°C)
Standard cover Cycolac, desert beige
Shipping weight 0.7 lbs. (0.3 kg)
Dimensions See Figure 4.
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 4. TH 192 S Dimensions in Inches (Millimeters).

Technical Instructions
Document Number 155-065P25
October 28, 2010
Page 6 Siemens 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 Thermostat Technical Instructions
Document Number 155-065P25
October 28, 2010
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:
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.
Figure 8. TH 192 S Sensitivity
Adjustment.
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
October 28, 2010
Page 8 Siemens 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 Thermostat Technical Instructions
Document Number 155-065P25
October 28, 2010
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.

Technical Instructions
Document Number 155-065P25
October 28, 2010
Page 10 Siemens Industry, Inc.
Table 3. Troubleshooting Guide.
Problem Check Cause Action
Air supply Low supply pressure As required
Nozzle or flapper Dirt on nozzle or
flapper Clean nozzle or replace thermostat
Restrictor Clogged restrictor Replace restrictor
Control pressure
stays at
approximately zero
Calibration Out of calibration Recalibrate
Nozzle Clogged nozzle
Clean nozzle or
replace thermostat
Control pressure
stays at
approximately
supply pressure Calibration Dirt on either supply or
exhaust valve seat Alternately close and open nozzle by gently
pushing down the
bimetal
Excessive air
leakage from
exhaust port on left
side of thermostat
Supply and return
line connection Connections are interchanged or
connection to port is
incorrect
As required
Chassis Tube Connector
and Restrictor Plate
Replacement
1. Remove thermostat chassis from wall. Terminal does not have a ball check valve.
NOTE: You must close off the supply air. For example, use a connector with the supply
air terminal plugged.
2. Remove two Phillips head screws from connector on back of thermostat chassis. Pull
connector out of recess. If necessary, pry connector loose with a screw driver, but be
careful not to damage restrictor plate and gasket.
3. Remove gasket from under connector. Remove restrictor. Remove second gasket
from under restrictor.
4. Use restrictor replacement kit 192-321 to replace gasket, restrictor, and second
gasket.
NOTE: The restrictor plate is keyed to ensure proper orientation during installation.
5. Remove filters from existing connector and insert in new connector. Or, if filters are
dirty, use restrictor replacement kit 192-321 to replace filters.
6. Use chassis tube connector replacement kit 192-525 to replace connector and
mounting screws.