Page 1
120
Powers™ Controls
TH 192 S Single Temperature Room
Thermostat
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The TH 192 S thermostats are proportional single output, single set point, 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 set point dial is provided. Air connections are made with 5/32” (4 mm) OD
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)
which slide into the wall mounting plate.
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Document No. 155-065P25
TH 192-1
Rev. 1, July, 1999
6050 70 80
70
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Direct and reverse acting models for one and two-pipe
•
Fahrenheit or Celsius set point 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, set point dial, filters, and restrictor plate
•
Covers available for concealed or exposed thermometers and for either concealed,
•
key, or exposed knob adjustment and set point indication
Standard plastic thermostat covers provide desert beige or white finish
•
Fixed temperature limit stops meet government specifications
•
Competitor adapter mounting kits available
•
Metal covers available in standard configurations with a variety of finishes
•
All thermostat chassis available with optional 1/2” large set point adjustment knobs
•
Siemens Building Technologies, Inc.
Landis Division
Page 2
Technical Instruction
Document No. 155-065P25
Rev. 1, July, 1999
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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 set point 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.
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Page 2 Siemens Building Technologies, Inc.
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Landis Division
Page 3
TH 192 S Single Temperature Room Thermostat Technical Instruction
155-065P25
Rev. 1, July, 1999
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Chassis
Table 1 for product number and ordering information on TH 192 S thermostat
See
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 set point adjustment knob located?
a. Adjustment knob located at bottom of chassis.
b. Adjustment knob on front with 1/2” large exposed knob.
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Two-pipe,
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One-pipe,
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non-relay
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192-202 192-203 192-222 192-223Exposed
192-200 192-201 192-220 192-221
192-202K 192-203K 192-222K 192-223K
192-200K 192-201K 192-220K 192-221K
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Siemens Building Technologies, Inc. Page 3
Landis Division
Page 4
Technical Instruction
Document No. 155-065P25
Rev. 1, July, 1999
Covers
Table 2 for product number and ordering information on TH 192 S thermostat
See
covers.
1. Is the set point adjustment exposed for customer adjustment or concealed to
prevent alteration of setting?
2. Is the thermometer exposed or concealed?
3. Is the set point 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?
a. Standard cover is plastic, desert beige color.
For white plastic cover option, add “W” suffix code to cover part number
(e.g., 192-256W).
b. Optional covers are plastic or metal and available in a variety of colors per
Table 3.
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Concealed 192-250 192-350Exposed
Exposed
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1. Key set point adjustment cover required for all thermostat chassis with
optional 1/2” large set point adjustment knobs.
2. To order an optional thermostat cover finish, add the appropriate suffix
letter listed in Table 3 to the end of the part number listed in Table 2.
Page 4 Siemens Building Technologies, Inc.
Landis Division
Page 5
TH 192 S Single Temperature Room Thermostat Technical Instruction
155-065P25
Rev. 1, July, 1999
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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)
Siemens Building Technologies, Inc. Page 5
Landis Division
Page 6
Technical Instruction
Document No. 155-065P25
Rev. 1, July, 1999
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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
Figure 4.
See
See the following Technical Bulletins for information on accessories.
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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
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155-244
155-245
155-231
155-222
155-255
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In the TH 192 S direct acting thermostat, an increase in temperature increases the
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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.
15 PSI
(103 KPA)
7.5PSI
(52 KPA)
OUTPUT PRESSURE
(21 KPA)
TH0396R1
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Page 6 Siemens Building Technologies, Inc.
REVERSE ACTING
DIRECT ACTING
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Landis Division
Page 7
TH 192 S Single Temperature Room Thermostat Technical Instruction
155-065P25
Rev. 1, July, 1999
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1. Use a test thermometer to read the current room temperature.
2. Place a screwdriver in the center of the thermometer assembly (Figure 6). Carefully
rotate thermometer assembly until pointer tip indicates the correct room
temperature.
NNNNOOOOTTTTEEEE:::: Avoid breathing on or touching the bimetal spiral since this affects the
temperature reading.
Thermostat limit stops define the
minimum and maximum thermostat set
points. The limit stops engage in the set
point cam gear teeth and cause
interference between the set point cam
gear and the adjustment knob gear.
To change limit stop settings, use needle
nose pliers to pull limit stop between the
set point 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).
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Siemens Building Technologies, Inc. Page 7
Landis Division
Page 8
Technical Instruction
Document No. 155-065P25
Rev. 1, July, 1999
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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)
NNNNOOOOTTTTEEEE:::: If the thermostat sensitivity is adjusted,
the thermostat must be recalibrated.
The thermostat is factory calibrated to a control pressure of 7.5 psi (52 kPa) when the set
point 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, the sensitivity
changed, or is out of adjustment, use the following steps to re-calibrate the instrument.
Graduation
closest to the
minimum
(MIN) end of
the bimetal
element
1 psi/°F
(12 kPa/°C)
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p p
Remove cover using 192-632 calibration
tool. Verify room temperature is between
70 and 80°F (21 and 27°C).
Page 8 Siemens Building Technologies, Inc.
SSSStttteeeep
p 2222 —
p p
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.
Landis Division
Page 9
TH 192 S Single Temperature Room Thermostat Technical Instruction
155-065P25
Rev. 1, July, 1999
SSSStttteeeep
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p 3333 —
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Moisten needle and insert 192-633 test
gauge and needle adapter in a test port.
Read control pressure.
p 4444 —
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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 set point can be
changed to the desired room temperature.
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Before troubleshooting thermostat per Table 4, 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.
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Siemens Building Technologies, Inc. Page 9
Landis Division
Page 10
Technical Instruction
Document No. 155-065P25
Rev. 1, July, 1999
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Control pressure
stays at
approximately zero
Control pressure
stays at
approximately
supply pressure
Excessive air
leakage from
exhaust port on
left side of
thermostat
1. Remove thermostat chassis from wall. Terminal does not have a ball check valve.
NNNNOOOOTTTTEEEE:::: 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.
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Air supply Low supply pressure As required
Nozzle or flapper Dirt on nozzle or
Restrictor Clogged restrictor Replace restrictor
Calibration Out of calibration Recalibrate
Nozzle Clogged nozzle Clean nozzle or replace
Calibration Dirt on either supply
or exhaust valve seat
Supply and return
line connection
Connections are
interchanged or
connection to port is
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flapper
Alternately close and
open nozzle by gently
incorrect
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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.
NNNNOOOOTTTTEEEE:::: 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.
Page 10 Siemens Building Technologies, Inc.
Landis Division
Page 11
TH 192 S Single Temperature Room Thermostat Technical Instruction
155-065P25
Rev. 1, July, 1999
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The following chart lists accessory parts and tools available for thermostat service.
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Dial thermometer (-40 to 140°F, -40 to 60°C) with pocket case
Basic pneumatic calibration kit with thermometer, gauge, squeeze
bulb, fittings, and case
Test head kit 832-179
Calibration tools 832-178
Test probe to check pressure with cover on
Needle probe with 1-1/2” diameter gauge 0-30 psig
(0-200 kPa) and calibration/cover wrench
Needle probe, no gauge (package of five) 192-759
1-1/2” diameter gauge , 0-200 kPa,
back connected 1/8” NPT male
1-1/2” diameter compound gauge, 0-30 psig/0-200 kPa,
back connected 1/8” NPT male
1-1/2” diameter compound gauge, 0-30 psig/0-200 kPa,
bottom connected 1/8” NPT male.
Replacement for use with 192-633
Chassis tube connector replacement kit with mounting screws
(material for 10 thermostats included)
Restrictor plate replacement kit with filters and gasket
(material for 10 thermostats included)
Plug-in adapters for quick thermostat removal
Straight, blue (package of 20) 192-485
Straight, white (package of 20) 192-486
Air link connects adapters for pressure tests (package of 20) 192-501
Compression ring (package of 100) 141-388
Elbow (provides quick return for wall surface mounting), blue
(package of 20)
Elbow (provides quick return for wall surface mounting), white
(package of 20)
20 scim (5.4 ml/sec) restrictors for 1-pipe systems (package of 5).
(1/4 “, 6.4 mm, OD plastic barb unless noted.)
Brass coupling, 1/8” NPT (1 only). 184-040
Coupling 184-116
Tee 184-113
Pre-piped dual tee for dual 1-pipe systems 184-130
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141-0573
832-177
192-633
142-0344
142-0373
142-0426
192-525
192-321
192-487
192-488
Siemens Building Technologies, Inc. Page 11
Landis Division
Page 12
Technical Instruction
Document No. 155-065P25
Rev. 1, July, 1999
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Replacement thermometer kits, brown (packages of 5)
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45° to 85°F 192-775
10° to 30°C
TH0443R1
Model 3 and Up
45° to 85°F 192-786
10° to 30°C
TH0442R1
Models 1 and 2
Replacement set point dials (packages of 10)
°F, Direct Acting 192-779
°F, Reverse Acting 192-780
Right Side
°C, Direct Acting 192-783
°C, Reverse Acting
°F, Direct Acting 192-777
°F, Reverse Acting 192-778
Left Side
°C, Direct Acting 192-781
°C, Reverse Acting
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192-776
192-785
192-784
192-782
Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as
design improvements are introduced. © 1999 Siemens Corporation
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Landis Division
1000 Deerfield Parkway
Buffalo Grove, IL 60089-4513
USA
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Document No. 155-065P25
Printed in the U.S.A. (origin)
Page
12
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