Siemens Free Energy Band TH 193 HC Betriebsanleitung

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.

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