Siemens Free Energy Band TH 193 HC Owner's manual

Siemens Industry, Inc.
POWERS™CONTROLS
Technical Instructions
Document No. 155-069P25
TH 193-5
March 23, 2018
Free Energy Band
®
TH 193 HC
Hesitation Room Thermostat
Description The TH 193 HC Hesitation Thermostats are proportional, single output, dual setpoint,
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 decreases due to internal heat gains, a deadband of control minimizes
energy consumption while the setpoint changes from 72°F (22°C) heating mode to 78°F
(26°C) cooling mode. Two setpoint dials allow adjustment of the deadband (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.
Features •Direct and reverse acting.
•Two separate, adjustable temperature setpoint indicating dials.
•Two highly sensitive bimetal thermostatic elements.
•Fahrenheit or Celsius models.
•Field adjustable deadband output pressure.
•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, key,
or exposed knob adjustment and setpoint indication.
•Standard plastic thermostat covers provide Desert Beige or white finish.

Technical Instructions Free Energy Band TH193 HC Hesitation Room Thermostat
Document Number 155-069P25
March 23, 2018
Page 2 Siemens Industry, Inc.
Optional Design
Features •Fixed temperature limit stops meet government specifications.
•Metal covers available in standard configurations with Desert Beige finish.
•Competitor adapter mounting kits available.
•All thermostat chassis available with optional 1/2-inch setpoint adjustment knobs.
Application TH 193 HC Hesitation Thermostats control valve and damper actuators in building
applications that require early morning heat and afternoon cooling. TH 193 HC
Hesitation Thermostats control space temperature and take advantage of the deadband
to "float" room temperature between heating and cooling modes while maintaining
energy management (maximum economy) and occupancy comfort.
Use TH 193 HC Hesitation two-pipe thermostats where multiple valves and 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.
Figure 1. Typical TH 193 HC Hesitation Thermostat Application.
Piping
Figure 2. TH 193 HC Hesitation Thermostat Connections.
Product Numbers
and Ordering
Information
Chassis
See Table 1 for product number and ordering information on TH 193 HC Hesitation
Thermostat chassis.
1. Is a Fahrenheit or Celsius scale required?
2. Is the heating and cooling control direct or reverse acting?
3. Where is the setpoint adjustment knob located?
a. Adjustment knob located at bottom of chassis.
b. Adjustment knob on front with 1/2-inch exposed knob.

Free Energy Band TH 193 HC Hesitation Room Thermostat Technical Instructions
Document Number 155-069P25
March 23, 2018
Siemens Industry, Inc. Page 3
Table 1. TH 193 HC Hesitation Thermostat Chassis Part Numbers.
Chassis with Wall Plate
Connection
Type
Setpoint
Adjustment
Fahrenheit
Celsius
Heating and
Cooling DA Heating and Cooling RA Heating and Cooling DA Heating and Cooling RA
Hesitation Exposed
at Bottom
of Cover
193-219 — 193-239 193-240
Exposed
1/2" Knob
on Cover *
193-219K — — —
* 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 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 the 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.
•For white plastic cover option, add “W” suffix code to cover part number
(for example: 192-256W). See Table 2.

Technical Instructions Free Energy Band TH193 HC Hesitation Room Thermostat
Document Number 155-069P25
March 23, 2018
Page 4 Siemens Industry, Inc.
Table 2. TH 193 HC Hesitation Thermostat Cover Part Numbers.
Setpoint
Adjustment
Cover Configuration Cover Part Number 2
Thermometer
Setpoint
Indicator
Standard
Plastic Cover
Desert Beige
Optional
Metal Cover
Desert Beige
Concealed Concealed Concealed 192-256 192-356
Exposed 192-254 192-354
Key1Concealed Exposed 192-267 192-367
Exposed 192-268 192-368
Exposed Concealed 192-258 192-358
Exposed 192-260 —
1 Key setpoint adjustment cover required for all thermostat chassis with optional
1/2-inch setpoint adjustment knobs.
2 To order a plastic cover with white finish, add suffix code "W".
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 40 scim (11 ml/sec)
Deadband
Output Pressure Adjustment 1 to 15 psi (7 to 103 kPa)
Range 0°F to 40°F (0°C to 20°C)
Temperature
Storage temperature -10°F to 140°F (-23°C to 60°C)
Ambient operating temperature 40°F to 140°F (4°C 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°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 9.

Free Energy Band TH 193 HC Hesitation Room Thermostat Technical Instructions
Document Number 155-069P25
March 23, 2018
Siemens Industry, Inc. Page 5
Accessories 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
Document Number
155-244P25
155-231P25
155-222P25
155-255P25
155-213
TH 193 HC FEB
Hesitation
Thermostat Details
Figure 3. TH 193 HC Hesitation Thermostat Details.
Operation The TH 193 HC Hesitation Thermostat is a two-temperature thermostat with a single
output. 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 Hesitation Thermostat 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 deadband. A 4°F (2°C) minimum deadband 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)
deadband.
Figure 5 shows direct acting TH193 HC hesitation output characteristics. As heating
increases, the output pressure increases from 0 to 8 psi (0 to 52 kPa). A field adjustable
deadband occurs. The deadband spans from 0°F to 40°F (-17°C to 4°C) with a 3 to
15 psi (21 to 103 kPa) output pressure. When the deadband elapses, cooling increases
from 8 to 15 psi (52 to 103 kPa).

Technical Instructions Free Energy Band TH193 HC Hesitation Room Thermostat
Document Number 155-069P25
March 23, 2018
Page 6 Siemens Industry, Inc.
Operation,
Continued
Figure 4. TH 193 HC Hesitation
Operating Characteristics. Figure 5. TH 193 HC Hesitation
Input/Output Characteristics.
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 3). Carefully
rotate the thermometer assembly until the pointer tip indicates the correct room
temperature.
NOTE: Avoid breathing on or touching the bimetal spiral, since this influences the
temperature reading.
Deadband Output
Pressure Adjustment
Step 1 —
Set the heating dial to minimum
temperature and the cooling dial to
maximum temperature.
Step 2 —
Adjust the relief valve until the control
pressure is at the deadband output
pressure.
Step 3 —
Set heating and cooling dials to desired setpoints. The deadband is between these two
setpoints.

Free Energy Band TH 193 HC Hesitation Room Thermostat Technical Instructions
Document Number 155-069P25
March 23, 2018
Siemens Industry, Inc. Page 7
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 the limit stop between
the setpoint cam gear teeth. Rotate the
limit stop to its new position. Do not pull
the 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 6. Thermostat 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:
Figure 7. TH 193 HC Hesitation
Sensitivity Adjustment.
Graduation
closest to the
rigid end of
the bimetal
element
4 psi/°F
(50 kPa/°C)
Graduation
closest to the
minimum end
of the
bimetal
element
1 psi/°F
(12 kPa/°C)
NOTE: If the thermostat sensitivity is adjusted,
the thermostat must be recalibrated.

Technical Instructions Free Energy Band TH193 HC Hesitation Room Thermostat
Document Number 155-069P25
March 23, 2018
Page 8 Siemens Industry, Inc.
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 with, the
sensitivity has changed, or it is out of adjustment, use the following steps to recalibrate
the instrument.
Cooling Calibration
Step 1 —
Remove the cover using the 192-632
Calibration Tool. Verify that the room
temperature is between 70°F and 80°F
(21°C and 27°C).
Step 2 —
Verify that the supply pressure is 18
to 25 psi (124 to 172 kPa). Set the
cooling dial to room temperature by
turning the exposed adjustment knob,
or using a hex key as shown. Allow
the thermostat to stand for about five
minutes to adjust to the new setting.
Step 3 —
Rotate the adjustment screw
clockwise to open the relief valve to
maximum. Allow the thermostat to
stand for about five minutes to adjust
to the new setting.
Step 4 —
Moisten the needle and insert the 192-
633 Test Gauge and needle adapter in
the test port. Read the control
pressure.
Step 5 —
If the control pressure does not read
7 to 8 psi (48 to 55 kPa), turn the
calibration screw using the 192-632
Calibration Tool or 1/8-inch (3.2 mm)
wrench until the 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.

Free Energy Band TH 193 HC Hesitation Room Thermostat Technical Instructions
Document Number 155-069P25
March 23, 2018
Siemens Industry, Inc. Page 9
Heating Calibration
Step 1 —
If not already done, remove the cover
using the 192-632 Calibration Tool.
Verify that the room temperature is
between 70°F and 80°F (21°C and
27°C).
Step 2 —
Verify that the supply pressure is 18
to 25 psi (124 to 172 kPa). Set the
heating dial to minimum, and the
cooling dial to maximum temperature
by turning the exposed adjustment
knob, or using a hex key as shown.
Step 3 —
Moisten the needle and insert the
192-633 Test Gauge and needle
adapter in the test port. Read the
control pressure.
Step 4 —
Rotate the adjustment screw
counterclockwise to close the relief
valve until the pressure is at least 5
psi (35 kPa). Allow the thermostat to
stand for about five minutes to adjust
to the new setting.

Technical Instructions Free Energy Band TH193 HC Hesitation Room Thermostat
Document Number 155-069P25
March 23, 2018
Page 10 Siemens Industry, Inc.
Heating Calibration, Continued
Step 5 —
Set the heating dial to room
temperature by turning the exposed
adjustment knob, or by using a hex
key as shown. Allow the thermostat to
stand for about five minutes to adjust
to the new setting.
Step 6 —
Moisten needle and insert
P/N 192-633 test gauge and needle
adapter in the test port. Read control
pressure.
Step 7 —
If control pressure does not show
required deadband output pressure,
turn calibration screw to obtain this
pressure. Sensing element is now in
calibration.
Troubleshooting Before troubleshooting thermostat per Table 4, ensure that there is clean, dry supply air
at 18 psi (124 kPa) minimum. Use the test probe gauge and needle adapter to measure
the control pressure at the 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.
Figure 8. Accessing Output Pressure Test Port.