Siemens TH 192 HC Manual del propietario

Powers®Controls

Technical Instructions

Document No. 155-066P25

TH 192-2

October 26, 2010

TH 192 HC Heating/Cooling Room

Thermostat

TH0356R1

POWERS

6050 70 80

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

Page 2 Siemens Industry, Inc.

Optional Design

Features

•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.

Application 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.

Piping

TO CONTROLLED

DEVICES

AIR SUPPLY

TH 192 HC

2-PIPE

THERMOSTAT

TH0256R1

Figure 2. TH 192 HC Thermostat Connections.

Product Numbers

and Ordering

Information

Chassis

See Table 1 for product number and ordering information on TH 192 HC thermostat

chassis.

1. Is a Fahrenheit or Celsius scale required?

2. Is the heating control direct or reverse acting?

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.

TH 192 HC Heating/Cooling Room Thermostat Technical Instructions

Document Number 155-066P25

October 26, 2010

Siemens Industry, Inc. Page 3

Table 1. TH 192 HC Thermostat Chassis Part Numbers.

Chassis with Wall Plate

Fahrenheit CelsiusConnection

Type Setpoint

Adjustment Heating DA Heating RA Heating DA Heating RA

Cooling DA

192-207 Cooling DA

192-209 Cooling DA

192-227 Cooling DA

192-229

Exposed

at Bottom

of Cover Cooling RA

192-208 Cooling RA

192-210 Cooling RA

192-228 Cooling RA

192-230

— — — —

Two-Pipe

Relay

Exposed

1/2” Knob

on Cover * 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.

Technical Instructions

Document Number 155-066P25

October 26, 2010

Page 4 Siemens Industry, Inc.

Table 2. TH 192 HC Thermostat Cover Part Numbers.

Cover Configuration Cover Part Number

(See Note 2)

Setpoint

Adjustment Thermometer Setpoint

Indicator Standard

Plastic Cover

Desert Beige

Standard

Metal Cover

Desert Beige

Concealed 192-256 192-356Concealed Exposed Concealed 192-254 192-354

Concealed 192-267 192-367

Key

(See Note 1) Exposed 192-268 192-368

Concealed 192-258 192-358Exposed

Exposed

192-260 192-360

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 See Table 1.

Operating ranges 45 to 85°F (7 to 30°C)

Supply air pressure, maximum 30 psi (207 kPa)

Normal air supply pressure

Heating 25 psi (172 kPa)

Cooling 18 psi (124 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 3.

TH 192 HC Heating/Cooling Room Thermostat Technical Instructions

Document Number 155-066P25

October 26, 2010

Siemens Industry, Inc. Page 5

Accessories 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.

Technical Instructions

Document Number 155-066P25

October 26, 2010

Page 6 Siemens Industry, Inc.

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: Avoid breathing on or touching the bimetal spiral since this influences the

temperature reading.

Changeover Point

Adjustment 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.

TH 192 HC Heating/Cooling Room Thermostat Technical Instructions

Document Number 155-066P25

October 26, 2010

Siemens Industry, Inc. Page 7

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)

Graduation

closest to the

minimum

(MIN) end of

the bimetal

element

1 psi/°F

(12 kPa/°C)

NOTE: If the thermostat sensitivity is adjusted, the

thermostat must be recalibrated.

Figure 8. TH 192 HC

Sensitivity Adjustment.

Technical Instructions

Document Number 155-066P25

October 26, 2010

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, the sensitivity

changed, or is out of adjustment, use the following steps to re-calibrate the instrument.

Cooling

Calibration

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.

TH 192 HC Heating/Cooling Room Thermostat Technical Instructions

Document Number 155-066P25

October 26, 2010

Siemens Industry, Inc. Page 9

Heating

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 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.

Technical Instructions

Document Number 155-066P25

October 26, 2010

Page 10 Siemens Industry, Inc.

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 Check Cause Action

Air supply Low supply

pressure As required

Nozzle or

flapper Dirt on nozzle or

flapper Clean nozzle or

replace thermostat

Restrictor Clogged restrictor Replace restrictor

Control pressure

stays at

approximately

zero

Calibration Out of calibration Recalibrate

Nozzle Clogged nozzle

Clean nozzle or

replace thermostat

Control pressure

stays at

approximately

supply pressure Calibration Dirt on either supply

or exhaust valve

seat

Alternately close and

open nozzle by gently

pushing down the

bimetal

Figure 9. Accessing Output

Pressure Test Port.

Excessive air

leakage from

exhaust port on

left side of

thermostat

Supply and

return line

connection

Connections are

interchanged or

connection to port is

incorrect

As required

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.

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