Siemens Powers TH 192 S Manuel du propriétaire

Powers®Controls

Technical Instructions

Document No. 155-065P25

TH 192-1

October 28, 2010

TH 192 S Single Temperature

Room Thermostat

TH0355R1

POWERS

6050 70 80

Description The TH 192 S thermostats are proportional single output, single setpoint, 1-pipe (low air

capacity) or 2-pipe (high air capacity) sensor controllers. Each thermostat includes a

wall mounting plate for installation in a variety of rough-in terminal boxes. A sensitive

bimetal responds to temperature change to modulate control air through a flapper

nozzle. One setpoint dial is provided. 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) that

slide into the wall mounting plate.

Features •Direct and reverse acting models for one- and two-pipe.

•Fahrenheit or Celsius setpoint dials.

•Highly sensitive bimetal thermostatic element.

•Field adjustable sensitivity with graduated scale.

•Integral field adjustable limit stops.

•Control pressure test port accessible without removing cover.

•Easily replaceable thermometer, setpoint dial, 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.

Optional Design

Features

•Fixed temperature limit stops meet government specifications.

•Competitor adapter mounting kits available.

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

•Some thermostat chassis are available with optional 1/2-inch, large setpoint

adjustment knobs.

Siemens Industry, Inc.

Technical Instructions

Document Number 155-065P25

October 28, 2010

Page 2 Siemens Industry, Inc.

Application TH 192 S thermostats are temperature sensing devices that control pneumatic valve and

damper actuators in heating and cooling applications such as air conditioners, space

heaters, unit ventilators, and air volume controllers. The thermostats maintain energy

management (maximum economy) and occupant comfort. TH 192 S thermostats are

available with covers that conceal or expose the setpoint adjustment dial.

Use TH 192 S 1-pipe thermostats with an external restrictor (20 scim, 5.4 ml/sec) where

a limited air capacity operates a single valve and/or actuator. Use TH 192 S 2-pipe

thermostats where multiple valves and actuators, used with or without high/low limiting

controls, require higher air capacities.

HOT

WATER

N.O. VALVE

CHILLED WATER

N.C. VALVE

EXTERNAL RESTRICTOR

1 - PIPE

DIAGRAM 1

CHILLED

WATER

CHILLED

WATER CHILLED

WATER

N.O. VALVE

HOT WATER

N.C. VALVE N.C. VALVE

EXTERNAL RESTRICTOR

1 - PIPE 2 - PIPE

DIAGRAM 2 DIAGRAM 3

N.O. VALVE

HOT WATER

N.C. VALVE

2 - PIPE

DIAGRAM 4

NOTE: DOTTED LINES ARE ALTERNATIVE CONTROL SCHEMES.

TH0242R1

Figure 1. Typical TH 192 S Thermostat Applications.

Piping

Figure 2. TH 192 S One-Pipe

Thermostat Connections.

Figure 3. TH 192 S Two-Pipe

Thermostat Connections.

TH 192 S Single Temperature Room Thermostat Technical Instructions

Document Number 155-065P25

October 28, 2010

Siemens Industry, Inc. Page 3

Product Numbers

and Ordering

Information

Chassis

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

chassis.

1. Is a one-pipe (low air capacity) or two-pipe (high air capacity) connection required

for application?

2. Is a Fahrenheit or Celsius scale required?

3. Is the control action direct or reverse acting?

a. Direct acting: An increase in temperature increases the control air pressure.

b. Reverse acting: An increase in temperature decreases the control air

pressure.

4. Where is setpoint adjustment knob located?

a. Adjustment knob located at bottom of chassis.

b. Adjustment knob on front with 1/2-inch, large exposed knob.

Table 1. TH 192 S Thermostat Chassis Part Numbers.

Chassis with Wall Plate

Fahrenheit CelsiusSetpoint

Adjustment Connection

Type Direct

Acting Reverse

Action Direct

Acting Reverse

Acting

Two-pipe,

relay 192-202 192-203 192-222 192-223

Exposed

at Bottom

of Cover One-pipe,

non-relay 192-200 192-201 192-220 192-221

Two-pipe,

relay 192-202K 192-203K 192-222K 192-223K

Exposed

1/2” Knob

on Cover * One-pipe,

non-relay 192-200K — — —

* This feature requires a key setpoint adjustment cover (or key type cover).

See Table 2.

Technical Instructions

Document Number 155-065P25

October 28, 2010

Page 4 Siemens Industry, Inc.

Covers See Table 2 for product number and ordering information on TH 192 S 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.

Table 2. TH 192 S Thermostat Cover Part Numbers.

Cover Configuration Cover Part Number

(See Note 2)

Setpoint

Adjustment

Thermometer Setpoint

Indicator Plastic Cover

Desert Beige Metal Cover

Desert Beige

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

Concealed 192-265 192-365

Key

(See Note 1) Exposed 192-266 192-366

Concealed 192-250 192-350Exposed Exposed

Exposed

192-252 192-352

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.

TH 192 S Single Temperature Room Thermostat Technical Instructions

Document Number 155-065P25

October 28, 2010

Siemens Industry, Inc. Page 5

Specifications Control action See Table 1.

Operating range 45 to 85°F (7 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)

Two-pipe 20 scim (5.5 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 4.

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 4. TH 192 S Dimensions in Inches (Millimeters).

Technical Instructions

Document Number 155-065P25

October 28, 2010

Page 6 Siemens Industry, Inc.

Operation In the TH 192 S direct acting thermostat, an increase in temperature increases the

control air pressure and a decrease in temperature decreases the control pressure.

In the TH 192 S reverse acting thermostat, an increase in temperature decreases the

control air pressure and a decrease in temperature increases the control pressure.

Figure 5. TH 192 S Input/Output Characteristics.

TH 192 S

Thermostat Details

Figure 6. TH 192 S 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 (See 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 affects the

temperature reading.

TH 192 S Single Temperature Room Thermostat Technical Instructions

Document Number 155-065P25

October 28, 2010

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 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 S 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 S Sensitivity

Adjustment.

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 changed, or is out of adjustment, use the following steps to recalibrate the

instrument.

Technical Instructions

Document Number 155-065P25

October 28, 2010

Page 8 Siemens Industry, Inc.

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 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 a 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 S Single Temperature Room Thermostat Technical Instructions

Document Number 155-065P25

October 28, 2010

Siemens Industry, Inc. Page 9

Troubleshooting Before troubleshooting thermostat per Table 3, 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.

Technical Instructions

Document Number 155-065P25

October 28, 2010

Page 10 Siemens Industry, Inc.

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

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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