Page 1
Powers® Controls
TH 192 DN Day-Night and
TH 192 DNV Day-Night-Vent
Room Thermostat
Technical Instructions
Document No. 155-067P25
TH 192-3
October 28, 2010
6050 70 80
Description
Features
70
TH0357R1
The TH 192 DN and DNV thermostats are proportional single output, dual setpoint,
2-pipe or 3-pipe (high air capacity) sensor controllers. Each thermostat includes a wall
mounting plate for installation in a variety of rough-in terminal boxes. Sensitive bimetals
respond to temperature change to modulate control air through a flapper nozzle. Two
setpoint dials are provided. When the supply air pressure changes from 18 to 25 psi
(124 to 172 kPa), the thermostat automatically switches from the day to the night
setpoint respectively. 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) which slide
into the wall mounting plate.
• Direct and reverse acting for day and night modes (DN models).
• Two separate adjustable temperature setpoint indicating dials.
• Two highly sensitive bimetal thermostatic elements.
• Operating mode automatically switches from day to night on change of main air
supply pressure.
• Manual override selector ensures off-hour occupancy comfort.
• Single screw adjustment for changeover switch setpoint.
• Individual field adjustable sensitivity with graduated scale for each mode.
POWERS
DAY
70
80
• Integral field adjustable limit stops.
• Control pressure test port accessible without removing cover.
• Easily replaceable thermometer, setpoint dials, filters, and restrictor plate.
• Fahrenheit or Celsius setpoint dials.
• Covers available for concealed or exposed thermometers and for either concealed,
key, or exposed knob adjustment and setpoint adjustment.
• Standard plastic thermostat covers provide Desert Beige or white finish.
Siemens Industry, Inc.
Page 2
Technical Instructions
Document Number 155-067P25
October 28, 2010
Optional Design
Features
• Fixed temperature limit stops meet government specifications.
• Metal covers available in Desert Beige or white finish.
• Competitor adapter mounting kits available.
• Some thermostat chassis are available with optional, 1/2-inch, large setpoint
adjustment knobs.
Application
TH 192 DN & DNV thermostats provide day to night (or weekend) temperature setback
to control pneumatic valve and damper actuators in heating and cooling applications
(Figure 1) such as air conditioners, space heaters, unit ventilators, and air volume
controllers.
The day-night thermostat is particularly useful in locations where all rooms in a zone are
not vacated at the same time. Using time clocks on evenings and weekends to reset the
control system to the night mode ensures optimum energy management. When a zone
is operating in maximum economy mode at night, an occupant can reset an individual
space to day temperature by switching a manual override. During night control, the TH
192 DNV provides a separate output signal (full air supply) which allows ventilation to
occur.
TH 192 DN & DNV thermostats maintain maximum economy and occupant comfort
automatically as a day progresses from the day time setpoint (65°F to 68°F, 18°C to
20°C) to the night time setpoint (55°F to 60°F, 13°C to 16°C). The thermostats are
available with covers that conceal or expose the setpoint adjustment dials.
Figure 1. Typical TH 192 DN & DNV Thermostat Applications.
Table 1. Typical TH 192 DNV Thermostat Application.
Chassis Port R2
Pressure
Operation Mode (Air
Supply)
Switching Relay
Connection
0 Psig (0 kPa) Day (S = 18 Psig, 124 kPa) B - D
0 Psig (0 kPa) Night Occupied B - D
Full Air Supply Night (S = 25 Psig, 172 kPa) A - D
Page 2 Siemens Industry, Inc.
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TH 192 DN Day-Night and DNV Day-Night-Vent Room Thermostat Technical Instructions
Document Number 155-067P25
October 28, 2010
Piping
Product Numbers
and Ordering
Information
Chassis
Type
Two- or
Three-Pipe
Relay
* This feature requires a key setpoint adjustment cover (or key type cover).
See Table 3.
Figure 2. TH 192 DN
Thermostat Connections.
See Table 2 for product number and ordering information on TH 192 DN & DNV
thermostat chassis.
1. Is a Fahrenheit or Celsius scale required?
2. Is the day and night time control direct or reverse acting?
3. Is a separate, full supply output signal required for ventilation control?
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 2. TH 192 DN & DNV Thermostat Chassis Part Numbers.
Chassis with Wall Plate
Control
Action
Day and Night
are Direct Acting
Day and Night
are Reverse
Acting
Day and Night
are Direct Acting
with Night Vent
Exposed at
Fahrenheit Celsius Connection
Exposed
Bottom of
Cover
192-204 192-204K 192-224 —
192-205 — 192-225 —
192-206 — 192-226 —
1/2” Knob
on Cover *
Figure 3. TH 192 DNV
Thermostat Connections.
Exposed at
Bottom of
Cover
Exposed
1/2” Knob
on Cover *
Siemens Industry, Inc. Page 3
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Technical Instructions
Document Number 155-067P25
October 28, 2010
Covers
See Table 3 for product number and ordering information on TH 192 DN and DNV
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.
a. For white metal cover option, add "H" suffix code to cover part
(for example: 192-356H). See Table 3.
Table 3. TH 192 DN & DNV Thermostat Cover Part Numbers.
Setpoint
Adjustment
Key
(See Note 1)
Key (Night),
Cover Configuration Cover Part Number
(See Note 2)
Thermometer
Concealed 192-262 192-362 Concealed
Exposed
Concealed 192-269 192-369
Setpoint
Indicator
Concealed
Exposed
Standard
Plastic Cover
Standard
Metal Cover
192-264 192-364
Exposed 192-270 192-370
Exposed
192-271 192-371
Exposed (Day)
(See Note 1)
1. Key setpoint adjustment cover required for all thermostat chassis with
optional 1/2-inch, 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.
Page 4 Siemens Industry, Inc.
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TH 192 DN Day-Night and DNV Day-Night-Vent Room Thermostat Technical Instructions
Document Number 155-067P25
October 28, 2010
Specifications
Control action See Table 2.
Operating ranges 45 to 85°F (7 to 30°C)
Supply air pressure, maximum 30 psi (207 kPa)
Normal air supply pressure
Day 18 psi (124 kPa)
Night 25 psi (172 kPa)
Sensitivity adjustment 1 to 4 psi/°F (12 to 50 kPa/°C)
Nominal air consumption, two-pipe 25 scim (6.8 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
Dimensions
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
Figure 4. TH 192 DN and DNV Dimensions in Inches (Millimeters).
Document Number
155-244
155-245
155-231
155-222
155-255
155-213
Siemens Industry, Inc. Page 5
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Technical Instructions
Document Number 155-067P25
October 28, 2010
Operation
Day-Night Operation
The TH 192 DN thermostat is either direct or reverse acting for both day and night
operating modes. In a direct acting thermostat, an increase in temperature increases
the control air pressure and a decrease in temperature decreases the control pressure.
In a reverse acting thermostat, an increase in temperature decreases the control air
pressure and a decrease in temperature increases the control pressure.
The TH 192 DN provides two separate bimetal elements; one for day temperature and
one for night temperature. Each bimetal element operates independently of the other.
Use of two different supply air pressures accomplishes changeover from day to night
temperature. A supply pressure of 18 psi (124 kPa) or 25 psi (172 kPa) positions a
changeover switch so a changeover relay operates in the day or night mode
respectively.
Manual Selector Switch
Day-Night-Vent
Operation
Figure 5. TH 192 DN and DNV Input/Output Characteristics.
A manual selector switch allows an individual thermostat to control at its day setting
even though the remainder of the system is controlling at its night setting.
• In the normal AUTO position, the manual selector switch does not interfere with air
passage to the changeover relay.
• To manually set the selector switch to the DAY position, push the selector in until it
latches and the handle points downward. In the latched DAY position, the manual
selector switch seals off air to the changeover relay.
• To manually reset the selector switch, rotate the handle until it unlatches and returns
to the normal AUTO position.
• Manual Selector Switch resets automatically when supply pressure changes back to
day time control.
The TH 192 DNV provides a supplementary air line connection at the back of the
thermostat.
NOTE: This third line feature cannot be added to a TH 192 DN in the field.
The vent line provides either 0 or 25 psi (0 or 172 kPa) pressure via the manual selector
switch to pilot auxiliary controls. For example, a unit ventilator can provide continuous
full day operation when the space is occupied and intermittent night operation when the
space is unoccupied.
Page 6 Siemens Industry, Inc.
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TH 192 DN Day-Night and DNV Day-Night-Vent Room Thermostat Technical Instructions
Document Number 155-067P25
October 28, 2010
TH 192 DN and DNV
Thermostat Details
Figure 6. TH 192 DN and DNV Thermostat Details.
Thermometer
Calibration
Changeover Point
Adjustment
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.
NOTE: Avoid breathing on or touching the bimetal spiral since this influences the
temperature reading.
The changeover point is factory set to occur between 19 and 22 psi (131 and 152 kPa).
The changeover point can be field adjustable to occur between 14 and 22 psi (96 and
152 kPa).
1. Connect pressure gauge or manometer to measure supply pressure to thermostat.
Use 30 psi (207 kPa) supply through a positioning switch so pressu re can be fully
variable.
2. Determine current change over point. Turn day dial so day and night control
pressures are different. Then note the changeover point on the control gauge as the
supply pressure changes.
3. Remove thermometer for access to changeover adjust screw. Use a 1/16" Allen Hex
Key to adjust changeover adjust screw as follows:
a. If changeover is too high, turn off supply pressure and rotate changeover adjust
screw clockwise. One turn decreases changeover point by about 3 psi (20 kPa).
Turn on supply pressure and recheck to verify new changeover point.
b. If changeover is too low, turn off supply pressure and rotate changeover adjust
screw counterclockwise. One turn increases changeover point by about 3 psi
(20 kPa). Turn on supply pressure and recheck to verify new changeover point.
Siemens Industry, Inc. Page 7
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Technical Instructions
Document Number 155-067P25
October 28, 2010
Changeover Point
Adjustment,
Continued
Figure 7. Changeover Point Adjustment.
Limit Stop
Adjustment
Sensitivity
Adjustment
Graduation
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).
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)
closest to the
minimum
(MIN) end of
the bimetal
element
1 psi/°F
(12 kPa/°C)
Figure 8. TH 192 DN and DNV
Limit Stop Adjustments.
Figure 9. TH 192 DN and DNV
Sensitivity Adjustment.
Page 8 Siemens Industry, Inc.
NOTE: If the thermostat sensitivity is adjusted,
the thermostat must be recalibrated.
Page 9
TH 192 DN Day-Night and DNV Day-Night-Vent Room Thermostat Technical Instructions
Document Number 155-067P25
October 28, 2010
Thermostat
Calibration
Day Time 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, the
sensitivity changed, or is out of adjustment, use the following steps to re-calibrate the
instrument.
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 daytime 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 the
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.
Siemens Industry, Inc. Page 9
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Technical Instructions
Document Number 155-067P25
October 28, 2010
Night Time Calibration
Step 1 —
If not already done, 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 25 psi (172 kPa).
Set nighttime 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 the
test port. Read control pressure.
Page 10 Siemens Industry, Inc.
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.
Page 11
TH 192 DN Day-Night and DNV Day-Night-Vent Room Thermostat Technical Instructions
Document Number 155-067P25
October 28, 2010
Troubleshooting
Control pressure
approximately zero
Control pressure
approximately
supply pressure
Excessive air
leakage from
exhaust port on left
side of thermostat
Before troubleshooting thermostat per Table 5, make certain there is clean dry supply air
at 18 psi (124 kPa) for day control and 25 psi (172 kPa) for night. 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 left side.
Figure 10. Accessing Output Pressure Test Port.
Table 4. Troubleshooting Guide.
Problem Check Cause Action
Air supply Low supply pressure As required
stays at
Nozzle or flapper
Dirt on nozzle or
flapper
Clean nozzle or
replace thermostat
Restrictor Clogged restrictor Replace restrictor
Calibration Out of calibration Recalibrate
Clean nozzle or
replace thermostat
Alternately close and
open nozzle by gently
stays at
Nozzle Clogged nozzle
Calibration
Dirt on either supply or
exhaust valve seat
pushing down the
bimetal
Supply and return
line connection
Connections are
interchanged or
As required
connection to port is
incorrect
Siemens Industry, Inc. Page 11
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Technical Instructions
Document Number 155-067P25
October 28, 2010
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.
Service Parts
The following chart lists accessory parts and tools available for thermostat service.
Description Part Number
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)
141-0573
832-177
192-633
142-0344
142-0373
142-0426
192-525
192-321
Page 12 Siemens Industry, Inc.
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Technical Instructions
Document Number 155-067P25
October 28, 2010
Service Parts
(Continued)
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, O.D. 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
Replacement thermometer kits, brown (package of 5)
Description Part Numbers
192-487
192-488
Scale Range Thermostat Model
45° to 85°F
192-775
10° to 30°C
TH0443R1
192-776
Model 3 and Up
45° to 85°F
192-786
10° to 30°C
TH0442R1
192-785
Models 1 and 2
Replacement setpoint dials (package of 10)
°F, Direct Acting 192-779
°F, Reverse Acting
Right Side
192-780
°C, Direct Acting 192-783
°C, Reverse Acting
°F, Direct Acting 192-777
°F, Reverse Acting 192-778
Left Side
192-784
°C, Direct Acting 192-781
°C, Reverse Acting
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. Powers is a registered trademark of Siemens Industry, Inc. Other product or company names mentioned
herein may be the trademarks of their respective owners. © 2010 Siemens Industry, Inc.
Siemens Industry, Inc.
Building Technologies Division
1000 Deerfield Parkway
Buffalo Grove, IL 60089
USA
+1 847-215-1000
Your feedback is important to us. If you have
comments about this document, please send them
to SBT_technical.editor.us.sbt@siemens.com
Document No. 155-067P25
Printed in the USA
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