Siemens Free Energy Band TH 193 HC, Powers Controls Free Energy Band TH 193 HC Technical Instructions

Powers® Controls

Free Energy Band® TH 193 HC
Heating/Cooling Room Thermostat

Technical Instructions

Document No. 155-068P25

TH 193-4

October 26, 2010

6050 70 80

70

60

TH0356R1

POWERS

80

Description

Features

The TH 193 HC thermostats are proportional dual output, dual setpoint, two-pipe (dual
one-pipe, low air capacity) or three-pipe (dual two-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 changes to
modulate control air through a flapper nozzle. As the heating load decrea ses due to
internal heat gains, a dead band of control minimizes energy consumption while the
setpoint changes from 72°F (22°C) heating mode to 78°F (26°C) cooling mod e. Two
setpoint dials allow adjustment of the dead band 4°F (2°C) minimum. Air connections
are made with 5/32-inch (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 heating and cooling modes.

• Two separate adjustable temperature setpoint indicating dials.

• Two highly sensitive bimetal thermostatic elements.

• Fahrenheit or Celsius models.

• Individual field adjustable sensitivity with graduated scale.

• 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 concealed

adjustment and setpoint indication.

• Standard plastic thermostat covers provide Desert Beige or white finish.

Siemens Industry, Inc.

Technical Instructions Free Energy Band TH 193 HC Heating/Cooling Room Thermostat
Document Number 155-068P25
October 26, 2010

•

Optional Design
Features

Fixed temperature limit stops meet government specifications.

•

Metal covers available in standard configurations with Desert Beige or white
finish.

•

Competitor adapter mounting kits available

Application

TH 193 HC thermostats control space temperature and take advantage of the dead
band to "float" room temperature between heating and cooling modes while maintaining
energy management (maximum economy) and occupancy comfort. TH 193 HC
thermostats control valve and damper actuators in building applications that require
early morning heat and afternoon cooling.

Use TH 193 HC two-pipe (dual one-pipe) thermostats with external restrictors (20 scim,

5.4 ml/sec) where a limited air capacity operates a single valve and/or actuator. Use
TH 193 HC three-pipe (dual two-pipe) thermostats where multiple valves an d actuators,
used with or without high/low limiting controls, require higher air capacities. The
thermostats are available with covers that conceal or expose the setpoint adjustment
dials.

Piping

Figure 2. TH 193 HC Thermostat

Dual One-Pipe Connections.

Page 2 Siemens Industry, Inc.

Figure 1. Typical TH 193 HC Thermostat Application.

Figure 3. TH 193 HC Thermostat

Dual Two-Pipe Connections.

Free Energy Band TH 193 HC Heating/Cooling Room Thermostat Technical Instructions
Document Number 155-068P25
October 26, 2010

Product Numbers
and Ordering
Information

Chassis

See Table 1 for product number and ordering information on TH 193 HC thermo stat
chassis.

1. Does application require one-pipe or two-pipe connection?
a. One-pipe thermostats are low air capacity devices and have only one port

connection (R1). This application requires an external restrictor.

b. Two-pipe thermostats are high air capacity devices for controlling two or more

terminal devices such as damper actuators or valves. This application req uires
two port connections: supply (S) and return (R1).

2. Is a Fahrenheit or Celsius scale required?

3. Is the heating control direct or reverse acting?

4. Is the cooling control direct or reverse acting?

Table 1. TH 193 HC Thermostat Chassis Part Numbers.

Chassis with Wall Plate

Fahrenheit Celsius Connection

Type

Setpoint

Adjustment

Heating DA Heating RA Heating DA Heating RA

One-Pipe

Relay

Two-Pipe

Relay

Exposed

at bottom

of cover

Cooling DA

193-211

Cooling RA

193-212

Cooling DA

193-215

Cooling RA

193-216

Cooling DA

193-213

Cooling RA

193-214

Cooling DA

193-217

Cooling RA

193-218

Cooling DA

193-231

Cooling RA

193-232

Cooling DA

193-235

Cooling RA

193-236

Cooling DA

193-233

Cooling RA

193-234

Cooling DA

193-237

Cooling RA

193-238

Siemens Industry, Inc. Page 3

Technical Instructions Free Energy Band TH 193 HC Heating/Cooling Room Thermostat
Document Number 155-068P25
October 26, 2010

Covers

See Table 2 for product number and ordering information on TH 193 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.

2. For white plastic cover option, add “W” suffix code to cover part number

(for example: 192-256W). See Table 2.

3. For white metal cover option, add "H" suffix code to cover part

(for example: 192-356H). See Table 2.

Table 2. TH 193 HC Thermostat Cover Part Numbers.

Setpoint

Adjustment

1

Key

Cover Configuration

Thermometer

Concealed 192-256 192-356 Concealed

Setpoint

Indicator

Concealed

Exposed

Concealed 192-267 192-367

Exposed

Cover Part Number

Standard

Plastic Cover

Desert Beige

Metal Cover

Desert Beige

192-254 192-354

Exposed 192-268 192-368

Concealed 192-258 192-358 Exposed

Exposed

192-260 192-360

1. Key setpoint adjustment cover is required for all thermostat chassis with
optional 1/2-inch setpoint adjustment knobs (for replacement only).

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.

2

Optional

Page 4 Siemens Industry, Inc.

Free Energy Band TH 193 HC Heating/Cooling Room Thermostat Technical Instructions
Document Number 155-068P25
October 26, 2010

Specifications

Control action See Table 1
Operating ranges 45°F to 85°F (7°C 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) per side

Two-pipe 230 scim (63 ml/sec) per side
Temperature response 0.1°F (0.06°C)
Temperature
Storage temperature -10°C to 140°F (-23°C to 60°C)

Ambient operating temperature 40°F to 140°F (4°C to 60°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°F and 85°F (7°C and 30°C)

Standard cover Cycolac, Desert Beige
Shipping weight 0.7 lbs. (0.3 kg)
Dimensions See Figure 10

Accessories

Operation

See the following Technical Bulletins for information on accessories:

Technical Bulletin

TB 237 Terminal Kits

TB 214 Adapter Kits

TB 193 Guard Kit

TB 241 Test Head Kit

TB 167 Restrictors

The TH 193 HC thermostat is a two-temperature thermostat with two separate outputs.
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 193 HC provides two separate bimetal elements; one for heating mode and the
other for cooling mode. The setpoint of the two elements determines the window of the
dead band. A 4°F (2°C) minimum dead band is standard, where the heating mode
setpoint is 72°F (22°C) and the cooling mode setpoint is 78°F (26°C). Figure 4 shows a
typical application with setpoints adjusted for a 6°F (4°C) dead band.

Figure 5 shows direct acting TH 193 HC output characteristics. As heating increases,
the output pressure increases from 0 to 15 psi (0 to 103 kPa). A field adjustable dead
band occurs. When the dead band elapses, cooling occurs from 0 to 15 psi (0 to
103 kPa).

Document Number

155-244P25
155-231P25
155-222P25
155-255P25

155-213

Siemens Industry, Inc. Page 5

Technical Instructions Free Energy Band TH 193 HC Heating/Cooling Room Thermostat
Document Number 155-068P25
October 26, 2010

Operation,
Continued

TH 193 HC
Thermostat Details

Figure 4. TH 193 HC Operating

Characteristics.

Figure 5. TH 193 HC Input/Output

Characteristics.

Figure 6. TH 193 HC Thermostat Details.

Thermometer
Calibration

Page 6 Siemens Industry, Inc.

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.

Free Energy Band TH 193 HC Heating/Cooling Room Thermostat Technical Instructions
Document Number 155-068P25
October 26, 2010

Limit Stop
Adjustment

Sensitivity
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).

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: If the thermostat sensitivity is adjusted,

the thermostat must be recalibrated.

Graduation

closest to the

minimum

(MIN) end of

the bimetal

element

1 psi/°F

(12 kPa/°C)

Figure 7. TH 193 HC

Limit Stop Adjustments.

Figure 8. TH 193 HC

Sensitivity Adjustment.

Thermostat
Calibration

Siemens Industry, Inc. Page 7

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 Free Energy Band TH 193 HC Heating/Cooling Room Thermostat
Document Number 155-068P25
October 26, 2010

Cooling Calibration

Step 1 —

Remove cover using P/N 192-632
calibration tool. Verify room
temperature is between 70°F and
80°F (2°C and 27°C).

Step 2 —
Verify that supply pressure is 18 to 25 psi (124 to
172 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
P/N 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 P/N 192-632
calibration tool or 1/8-inch (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 8 Siemens Industry, Inc.

Free Energy Band TH 193 HC Heating/Cooling Room Thermostat Technical Instructions
Document Number 155-068P25
October 26, 2010

Heating Calibration

Step 1 —

If not already done, remove cover
using P/N 192-632 calibration tool.
Verify room temperature is between
70°F and 80°F (21°C 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
P/N 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 P/N 192-632
calibration tool or 1/8-inch (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

Technical Instructions Free Energy Band TH 193 HC Heating/Cooling Room Thermostat
Document Number 155-068P25
October 26, 2010

Troubleshooting

Before troubleshooting thermostat (see 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.

Figure 9. Accessing Output Pressure Test Port.

CAUTION:

If you use the wrong test port, thermostat damage can occur and result in
replacement of the device.

Table 3. Troubleshooting Guide.

Problem Check Cause Action

Control pressure
stays at
approximately zero

Air supply Low supply pressure As required
Nozzle or flapper

Dirt on nozzle or

flapper
Restrictor Clogged restrictor Replace restrictor
Calibration Out of calibration Recalibrate

Control pressure

Nozzle Clogged nozzle

stays at
approximately
supply pressure

Excessive air
leakage from
exhaust port on left
side of thermostat

Calibration

Supply and return
line connection

Dirt on either supply or

exhaust valve seat

Connections are

interchanged or

connection to port is

incorrect

Clean nozzle or
replace thermostat

Clean nozzle or
replace thermostat

Alternately close and
open nozzle by gently
pushing down the
bimetal

As required

Page 10 Siemens Industry, Inc.

Free Energy Band TH 193 HC Heating/Cooling Room Thermostat Technical Instructions
Document Number 155-068P25
October 26, 2010

Chassis Tube
Connector and
Restrictor Plate

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.

Replacement

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 screwdriver, 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 P/N 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 P/N 192-321 to replace filters.

6. Use chassis tube connector replacement kit P/N 192-525 to replace connector and
mounting screws.

Siemens Industry, Inc. Page 11

Technical Instructions Free Energy Band TH 193 HC Heating/Cooling Room Thermostat
Document Number 155-068P25
October 26, 2010

Service Parts

The following chart lists accessory parts and tools available for thermostat service.

Description Part Number

Dial thermometer (-40°F to 140°F, -40°C to 60°C) with pocket

141-0573

case
Basic pneumatic calibration kit with thermometer, gauge, squeeze

832-177

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

192-633

(0-200 kPa) and calibration/cover wrench
Needle probe, no gauge (package of five) 192-759
1-1/2" diameter gauge, 0-200 kPa,

142-0344

back connected 1/8" NPT male
1-1/2" diameter compound gauge, 0-30 psig/0-200 kPa,

142-0373

back connected 1/8" NPT male
1-1/2" diameter compound gauge, 0-30 psig/0-200 kPa,

142-0426
bottom connected 1/8" NPT male.
Replacement for use with 192-633

Chassis tube connector replacement kit with mounting screws

192-525

(material for 10 thermostats included)
Restrictor plate replacement kit with filters and gasket

192-321

(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

192-487

(package of 20)
Elbow (provides quick return for wall surface mounting), white

192-488

(package of 20)

20 scim (5.4 ml/sec) restrictors for one-pipe systems
(package of 5). (1/4", 6.4 mm, O.D. plastic barb unless noted.)

Brass coupling, 1/8" NPT (one only). 184-040
Coupling 184-116
Tee 184-113
Pre-piped dual tee for dual one-pipe systems 184-130

Page 12 Siemens Industry, Inc.

Technical Instructions Free Energy Band TH 193 HC Heating/Cooling Room Thermostat
Document No. 155-068P25
October 26, 2010

Description Part Number

Replacement thermometer kits, brown (packages of 5)

Scale Range Thermostat Model

45°F to 85°F

192-775

10°C to 30°C

TH0443R1

192-776

Model 3 and Up

45°F to 85°F

192-786

10°C to 30°C

TH0442R1

192-785

Models 1 and 2

Replacement setpoint dials (packages of 10)

°F, Direct Acting 192-779

Right Side

°F, Reverse Acting 192-780

°C, Direct Acting 192-783

°C, Reverse Acting

°F, Direct Acting 192-777

Left Side

192-784

°F, Reverse Acting 192-778

°C, Direct Acting 192-781

°C, Reverse Acting

192-782

Dimensions

Figure 10. TH 193 HC Dimensions in Inches (Millimeters).

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 and Free Energy Band are registered trademarks 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

Your feedback is important to us. If you have

comments about this document, please send them to

[e-mail]

Document No. 155-068P25

Printed in the USA

Page 13