Siemens TH 192 S Specifications

Technical Instructions
Document No. 155-066P25
TH 192-2
October 26, 2010
Powers® Controls
TH 192 HC Heating/Cooling Room
Thermostat
50
60
70
80
TH0356R1
70
60
80
POWERS
Description
The TH 192 HC thermostats are proportional single output, dual setpoint, 2-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 cooling to the heating 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.
Features
•
Direct and reverse acting models for heating and cooling modes.
•
Separate adjustable temperature setpoint indicating dials for heating and cooling.
•
Fahrenheit or Celsius setpoint dials.
•
Highly sensitive bimetal thermostatic element.
•
Individual field adjustable sensitivity with graduated scale.
•
Operating mode automatically switches between heating and cooling on change of
main air supply pressure.
•
Integral field adjustable limit stops.
•
Control pressure test port accessible without removing cover.
•
Easily replaceable thermometer, setpoint dials, 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.
Siemens Industry, Inc.
Technical Instructions
Document Number 155-066P25
October 26, 2010
Optional Design
Features
Application
•
Fixed temperature limit stops meet government specifications.
•
Metal covers available in standard configurations provide Desert Beige or white
finish.
•
Competitor adapter mounting kits available.
•
All thermostat chassis available with optional 1/2” large setpoint adjustment knobs.
TH 192 HC thermostats provide all-season temperature control for two-pipe hot
water/chilled water heating and cooling applications (Figure 1) such as air conditioners,
space heaters, and unit ventilators. Thermostats maintain energy management
(maximum economy) and occupant comfort automatically as seasons change from the
heating setpoint (65-68°F, 10-20°C) to the cooling setpoint (76-80°F, 24-27°C).
TH 192 HC thermostats are available with covers that conceal or expose the setpoint
adjustment dials.
Figure 1. Typical TH 192 HC Thermostat Application.
TH0256R1
Piping
TH 192 HC
2-PIPE
THERMOSTAT
R1
S
TO CONTROLLED
DEVICES
AIR SUPPLY
Figure 2. TH 192 HC Thermostat Connections.
Product Numbers
and Ordering
Information
See Table 1 for product number and ordering information on TH 192 HC thermostat
chassis.
Chassis
2. Is the heating control direct or reverse acting?
1. Is a Fahrenheit or Celsius scale required?
3. Is the cooling control direct or reverse acting
4. Where is setpoint adjustment knob located?
a. Adjustment knob located at bottom of chassis.
b. Adjustment knob on front with 1/2” large exposed knob.
Page 2
Siemens Industry, Inc.
TH 192 HC Heating/Cooling Room Thermostat
Technical Instructions
Document Number 155-066P25
October 26, 2010
Table 1. TH 192 HC Thermostat Chassis Part Numbers.
Chassis with Wall Plate
Connection
Setpoint
Fahrenheit
Type
Adjustment Heating DA
Heating RA
Two-Pipe
Exposed
Cooling DA
Cooling DA
Relay
at Bottom
192-207
192-209
of Cover
Cooling RA
Cooling RA
Exposed
1/2” Knob
on Cover *
Celsius
Heating DA Heating RA
Cooling DA Cooling DA
192-227
192-229
192-208
192-210
Cooling RA
192-228
Cooling RA
192-230
—
—
—
—
Cooling RA
192-208 K
—
—
—
* This feature requires a key setpoint adjustment cover (or key type cover).
See Table 2.
Covers
See Table 2 for product number and ordering information on TH 192 HC 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.
Siemens Industry, Inc.
Page 3
Technical Instructions
Document Number 155-066P25
October 26, 2010
Table 2. TH 192 HC Thermostat Cover Part Numbers.
Cover Configuration
Setpoint
Adjustment
Concealed
Thermometer
Setpoint
Indicator
Concealed
Concealed
Exposed
Cover Part Number
(See Note 2)
Standard
Standard
Plastic Cover Metal Cover
Desert Beige Desert Beige
192-256
192-356
192-254
192-354
192-267
192-367
Key
(See Note 1)
Concealed
Exposed
192-268
192-368
Exposed
Concealed
192-258
192-358
Exposed
192-260
192-360
Exposed
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.
Specifications
Control action
Operating ranges
Supply air pressure, maximum
Normal air supply pressure
Heating
Cooling
Sensitivity adjustment
Nominal air consumption (two-pipe)
Temperature
Storage temperature
Ambient operating temperature
Temperature response
Dial graduations
Factory settings
Calibration @ 72°F (22°C)
Sensitivity
Limit stop adjustment
Standard cover
Shipping weight
Dimensions
Page 4
See Table 1.
45 to 85°F (7 to 30°C)
30 psi (207 kPa)
25 psi (172 kPa)
18 psi (124 kPa)
1 to 4 psi/°F (12 to 50 kPa/°C)
25 scim (6.8 ml/sec)
-10 to 140°F (-23 to 60°C)
40 to 140°F (4 to 60°C)
0.1°F (0.06°C)
2°F (1°C)
7.5 psi (52 kPa)
2.5 psi/°F (31 kPa/°C)
45 and 85°F (7 and 30°C)
Cycolac, Desert Beige
0.7 lbs. (0.3 kg)
See Figure 3.
Siemens Industry, Inc.
TH 192 HC Heating/Cooling Room Thermostat
Accessories
Technical Instructions
Document Number 155-066P25
October 26, 2010
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 3. TH 192 HC Dimensions in Inches (Millimeters).
Operation
Heating-Cooling
Operation
The TH 192 HC thermostat combines direct or reverse acting heating control with direct
or reverse acting cooling control. In direct acting control, an increase in temperature
increases the control air pressure and a decrease in temperature decreases the control
pressure. In reverse acting control, an increase in temperature decreases the control air
pressure and a decrease in temperature increases the control pressure.
The TH 192 HC provides two separate bimetal elements; one for heating mode control
and one for cooling mode control. Each bimetal element operates independently of the
other. Use of two different supply air pressures accomplishes changeover from heating
to cooling modes. A supply pressure of 18 psi (124 kPa) or 25 psi (172 kPa) positions a
changeover switch so a changeover relay operates in the cooling or heating mode
respectively.
Figure 4. TH 192 HC Input/Output Characteristics.
Siemens Industry, Inc.
Page 5
Technical Instructions
Document Number 155-066P25
October 26, 2010
TH 192 HC
Thermostat Details
Figure 5. TH 192 HC 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 (Figure 5). Carefully
rotate thermometer assembly until pointer tip indicates the correct room temperature.
NOTE:
Changeover Point
Adjustment
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 pressure can be fully variable.
2. Determine current change over point. Turn cooling dial so cooling and heating 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 adjustment screw. Use a 1/16’ Allen
Hex Key to adjust changeover adjustment screw as follows:
a. If changeover is too high, turn off supply pressure and rotate changeover
adjustment 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
adjustment screw counterclockwise. One turn increases changeover point by
about 3 psi (20 kPa). Turn on supply pressure and recheck to verify new
changeover point.
Page 6
Siemens Industry, Inc.
TH 192 HC Heating/Cooling Room Thermostat
Technical Instructions
Document Number 155-066P25
October 26, 2010
Changeover Point
Adjustment,
Continued
Figure 6. Changeover Point Adjustment.
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 HC 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)
NOTE:
Siemens Industry, Inc.
Graduation
closest to the
minimum
(MIN) end of
the bimetal
element
1 psi/°F
(12 kPa/°C)
Figure 8. TH 192 HC
Sensitivity Adjustment.
If the thermostat sensitivity is adjusted, the
thermostat must be recalibrated.
Page 7
Technical Instructions
Document Number 155-066P25
October 26, 2010
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, the sensitivity
changed, or is out of adjustment, use the following steps to re-calibrate the instrument.
Cooling
Calibration
Page 8
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 cooling 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.
TH 192 HC Heating/Cooling Room Thermostat
Technical Instructions
Document Number 155-066P25
October 26, 2010
Heating
Calibration
Siemens Industry, Inc.
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 heating 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.
Page 9
Technical Instructions
Document Number 155-066P25
October 26, 2010
Troubleshooting
Before troubleshooting thermostat per Table 4, make certain there is clean dry supply air
at 18 psi (124 kPa) for cooling and 25 psi (172 kPa) for heating. 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 for two-pipe thermostats.
Table 3. Troubleshooting Guide.
Problem
Control pressure
stays at
approximately
zero
Control pressure
stays at
approximately
supply pressure
Figure 9. Accessing Output
Pressure Test Port.
Chassis Tube
Connector and
Restrictor Plate
Replacement
Excessive air
leakage from
exhaust port on
left side of
thermostat
Check
Air supply
Cause
Low supply
pressure
Action
As required
Nozzle or
flapper
Dirt on nozzle or
flapper
Clean nozzle or
replace thermostat
Restrictor
Clogged restrictor
Replace restrictor
Calibration
Out of calibration
Recalibrate
Nozzle
Clogged nozzle
Clean nozzle or
replace thermostat
Calibration
Dirt on either supply Alternately close and
or exhaust valve open nozzle by gently
seat
pushing down the
bimetal
Supply and
return line
connection
Connections are
interchanged or
connection to port is
incorrect
As required
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.
Page 10
Siemens Industry, Inc.
TH 192 HC Heating/Cooling Room Thermostat
Service Parts
Technical Instructions
Document Number 155-066P25
October 26, 2010
The following chart lists accessory parts and tools available for thermostat service.
Description
Dial thermometer (-40 to 140°F, -40 to 60°C) with pocket case
Part Number
141-0573
Basic pneumatic calibration kit with thermometer, gauge, squeeze
bulb, fittings, and case
832-177
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
192-633
Needle probe, no gauge (package of five)
192-759
1-1/2” diameter gauge , 0-200 kPa,
back connected 1/8” NPT male
142-0344
1-1/2” diameter compound gauge, 0-30 psig/0-200 kPa,
back connected 1/8” NPT male
142-0373
1-1/2” diameter compound gauge, 0-30 psig/0-200 kPa,
bottom connected 1/8” NPT male.
Replacement for use with 192-633
142-0426
Chassis tube connector replacement kit with mounting screws
(material for 10 thermostats included)
192-525
Restrictor plate replacement kit with filters and gasket
(material for 10 thermostats included)
192-321
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)
192-487
Elbow (provides quick return for wall surface mounting), white
(package of 20)
192-488
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
Siemens Industry, Inc.
Page 11
Technical Instructions
Document No. 155-066P25
October 26, 2010
Service Parts
(Continued)
10° to 30°C
TH0443R1
Description
Replacement thermometer kits, brown (packages of 5)
Scale Range
Thermostat Model
45° to 85°F
Part Number
192-775
192-776
Model 3 and Up
10° to 30°C
192-786
TH0442R1
45° to 85°F
192-785
Models 1 and 2
Replacement setpoint dials (packages of 10)
°F, Direct Acting
°F, Reverse Acting
192-779
Right Side
192-780
°C, Direct Acting
192-783
°C, Reverse Acting
192-784
°F, Direct Acting
192-777
°F, Reverse Acting
Left Side
192-778
°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 60089-4513
USA
Your feedback is important to us. If you have
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to SBT_technical.editor.us.sbt@siemens.com
Document No. 155-066P25
Printed in the USA
Page 12