Siemens Powers TH 192 S Owner's manual

Siemens Building Technologies, Inc.
Landis Division
120
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Document No. 155-065P25
TH 192-1
Rev. 1, July, 1999
TH 192 S Single Temperature Room
Thermostat
80
70
TH0355R1
POWERS
6050 70 80
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nThe 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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es •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
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es •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

Technical Instruction
Document No. 155-065P25
Rev. 1, July, 1999
Page 2 Siemens Building Technologies, Inc.
Landis Division
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nTH 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.
R1
DA
DA
HOT
WATER
N.O. VALVE
CHILLED WATER
N.C. VALVE
S
EXTERNAL RESTRICTOR
1 - PIPE
DIAGRAM 1
R1
R1
RA
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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.
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TH 192 S Single Temperature Room Thermostat Technical Instruction
155-065P25
Rev. 1, July, 1999
Siemens Building Technologies, Inc. Page 3
Landis Division
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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 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,
relay
192-202 192-203 192-222 192-223Exposed
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 192-201K 192-220K 192-221K
* This feature requires a key set point adjustment cover (or key type cover).
See Table 2.

Technical Instruction
Document No. 155-065P25
Rev. 1, July, 1999
Page 4 Siemens Building Technologies, Inc.
Landis Division
Covers See Table 2 for product number and ordering information on TH 192 S thermostat
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 192-256 192-356Concealed
Exposed
Concealed
192-254 192-354
Concealed 192-265 192-365Key
(See Note 1) Exposed 192-266 192-366
Concealed 192-250 192-350Exposed
Exposed
Exposed
192-252 192-352
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.

TH 192 S Single Temperature Room Thermostat Technical Instruction
155-065P25
Rev. 1, July, 1999
Siemens Building Technologies, Inc. Page 5
Landis Division
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:For color samples, order color reference guide 152-178P10.
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None Plastic
(standard)
Desert Beige D #10 Special
Bronze
W Plastic
(optional)
White E Brushed
Electro-plated
Satin Chrome
None Metal
(standard)
Desert Beige F Sierra Gold
A #1 Silver G Brushed
Aluminum
B#5 Satin
Chrome
C
Metal
(optional)
#7 Light
Statuary Bronze
H
Metal
(optional)
White
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sControl 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)

Technical Instruction
Document No. 155-065P25
Rev. 1, July, 1999
Page 6 Siemens Building Technologies, Inc.
Landis Division
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(Continued)
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.
Acc
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Access
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es 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
155-213
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nIn 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.
45 50 55 60 65 70 75 80 85F
18137 24 30C
15 PSI
(103 KPA)
7.5PSI
(52 KPA)
3 PSI
(21 KPA)
TEMPERATURE
OUTPUT PRESSURE
DIRECT ACTING
FACTORY SET
POINT CONDITIONS
REVERSE ACTING
0
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TH 192 S Single Temperature Room Thermostat Technical Instruction
155-065P25
Rev. 1, July, 1999
Siemens Building Technologies, Inc. Page 7
Landis Division
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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.
N
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:Avoid breathing on or touching the bimetal spiral since this affects the
temperature reading.
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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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Technical Instruction
Document No. 155-065P25
Rev. 1, July, 1999
Page 8 Siemens Building Technologies, Inc.
Landis Division
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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)
Graduation
closest to the
minimum
(MIN) end of
the bimetal
element
1 psi/°F
(12 kPa/°C)
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:If the thermostat sensitivity is adjusted,
the thermostat must be recalibrated.
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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.
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1 —
Remove cover using 192-632 calibration
tool. Verify room temperature is between
70 and 80°F (21 and 27°C).
S
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22
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.

TH 192 S Single Temperature Room Thermostat Technical Instruction
155-065P25
Rev. 1, July, 1999
Siemens Building Technologies, Inc. Page 9
Landis Division
S
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33
3 —
Moisten needle and insert 192-633 test
gauge and needle adapter in a test port.
Read control pressure.
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44
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 set point can be
changed to the desired room temperature.
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ng 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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Technical Instruction
Document No. 155-065P25
Rev. 1, July, 1999
Page 10 Siemens Building Technologies, Inc.
Landis Division
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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
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1. Remove thermostat chassis from wall. Terminal does not have a ball check valve.
N
NN
NO
OO
OT
TT
TE
EE
E:
::
: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.
N
NN
NO
OO
OT
TT
TE
EE
E:
::
: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.