Siemens TH 192 DN Manual del propietario

Powers®Controls

Technical Instructions

Document No. 155-067P25

TH 192-3

October 28, 2010

TH 192 DN Day-Night and

TH 192 DNV Day-Night-Vent

Room Thermostat

TH0357R1

POWERS

6050 70 80

DAY

Description The TH 192 DN and DNV thermostats are proportional single output, dual setpoint,

2-pipe or 3-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 day to the night

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 for day and night modes (DN models).

•Two separate adjustable temperature setpoint indicating dials.

•Two highly sensitive bimetal thermostatic elements.

•Operating mode automatically switches from day to night on change of main air

supply pressure.

•Manual override selector ensures off-hour occupancy comfort.

•Single screw adjustment for changeover switch setpoint.

•Individual field adjustable sensitivity with graduated scale for each mode.

•Integral field adjustable limit stops.

•Control pressure test port accessible without removing cover.

•Easily replaceable thermometer, setpoint dials, filters, and restrictor plate.

•Fahrenheit or Celsius setpoint dials.

•Covers available for concealed or exposed thermometers and for either concealed,

key, or exposed knob adjustment and setpoint adjustment.

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

Siemens Industry, Inc.

Technical Instructions

Document Number 155-067P25

October 28, 2010

Page 2 Siemens Industry, Inc.

Optional Design

Features

•Fixed temperature limit stops meet government specifications.

•Metal covers available in Desert Beige or white finish.

•Competitor adapter mounting kits available.

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

adjustment knobs.

Application TH 192 DN & DNV thermostats provide day to night (or weekend) temperature setback

to control pneumatic valve and damper actuators in heating and cooling applications

(Figure 1) such as air conditioners, space heaters, unit ventilators, and air volume

controllers.

The day-night thermostat is particularly useful in locations where all rooms in a zone are

not vacated at the same time. Using time clocks on evenings and weekends to reset the

control system to the night mode ensures optimum energy management. When a zone

is operating in maximum economy mode at night, an occupant can reset an individual

space to day temperature by switching a manual override. During night control, the TH

192 DNV provides a separate output signal (full air supply) which allows ventilation to

occur.

TH 192 DN & DNV thermostats maintain maximum economy and occupant comfort

automatically as a day progresses from the day time setpoint (65°F to 68°F, 18°C to

20°C) to the night time setpoint (55°F to 60°F, 13°C to 16°C). The thermostats are

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

Figure 1. Typical TH 192 DN & DNV Thermostat Applications.

Table 1. Typical TH 192 DNV Thermostat Application.

Chassis Port R2

Pressure Operation Mode (Air

Supply) Switching Relay

Connection

0 Psig (0 kPa) Day (S = 18 Psig, 124 kPa) B - D

0 Psig (0 kPa) Night Occupied B - D

Full Air Supply Night (S = 25 Psig, 172 kPa) A - D

TH 192 DN Day-Night and DNV Day-Night-Vent Room Thermostat Technical Instructions

Document Number 155-067P25

October 28, 2010

Siemens Industry, Inc. Page 3

Piping

Figure 2. TH 192 DN

Thermostat Connections.

Figure 3. TH 192 DNV

Thermostat Connections.

Product Numbers

and Ordering

Information

Chassis

See Table 2 for product number and ordering information on TH 192 DN & DNV

thermostat chassis.

1. Is a Fahrenheit or Celsius scale required?

2. Is the day and night time control direct or reverse acting?

3. Is a separate, full supply output signal required for ventilation control?

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 2. TH 192 DN & DNV Thermostat Chassis Part Numbers.

Chassis with Wall Plate

Fahrenheit CelsiusConnection

Type Control

Action Exposed at

Bottom of

Cover

Exposed

1/2” Knob

on Cover *

Exposed at

Bottom of

Cover

Exposed

1/2” Knob

on Cover *

Day and Night

are Direct Acting 192-204 192-204K 192-224 —

Day and Night

are Reverse

Acting

192-205 — 192-225 —

Two- or

Three-Pipe

Relay

Day and Night

are Direct Acting

with Night Vent

192-206 — 192-226 —

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

See Table 3.

Technical Instructions

Document Number 155-067P25

October 28, 2010

Page 4 Siemens Industry, Inc.

Covers See Table 3 for product number and ordering information on TH 192 DN and DNV

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.

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

(for example: 192-356H). See Table 3.

Table 3. TH 192 DN & DNV Thermostat Cover Part Numbers.

Cover Configuration Cover Part Number

(See Note 2)

Setpoint

Adjustment

Thermometer Setpoint

Indicator Standard

Plastic Cover Standard

Metal Cover

Concealed 192-262 192-362Concealed Exposed Concealed 192-264 192-364

Concealed 192-269 192-369

Key

(See Note 1) Exposed 192-270 192-370

Key (Night),

Exposed (Day)

(See Note 1)

Exposed

192-271 192-371

1. Key setpoint adjustment cover required for all thermostat chassis with

optional 1/2-inch, 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 DN Day-Night and DNV Day-Night-Vent Room Thermostat Technical Instructions

Document Number 155-067P25

October 28, 2010

Siemens Industry, Inc. Page 5

Specifications Control action See Table 2.

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

Supply air pressure, maximum 30 psi (207 kPa)

Normal air supply pressure

Day 18 psi (124 kPa)

Night 25 psi (172 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 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 DN and DNV Dimensions in Inches (Millimeters).

Technical Instructions

Document Number 155-067P25

October 28, 2010

Page 6 Siemens Industry, Inc.

Operation

Day-Night Operation The TH 192 DN thermostat is either direct or reverse acting for both day and night

operating modes. In a direct acting thermostat, an increase in temperature increases

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

In a reverse acting thermostat, an increase in temperature decreases the control air

pressure and a decrease in temperature increases the control pressure.

The TH 192 DN provides two separate bimetal elements; one for day temperature and

one for night temperature. Each bimetal element operates independently of the other.

Use of two different supply air pressures accomplishes changeover from day to night

temperature. A supply pressure of 18 psi (124 kPa) or 25 psi (172 kPa) positions a

changeover switch so a changeover relay operates in the day or night mode

respectively.

Figure 5. TH 192 DN and DNV Input/Output Characteristics.

Manual Selector Switch A manual selector switch allows an individual thermostat to control at its day setting

even though the remainder of the system is controlling at its night setting.

•In the normal AUTO position, the manual selector switch does not interfere with air

passage to the changeover relay.

•To manually set the selector switch to the DAY position, push the selector in until it

latches and the handle points downward. In the latched DAY position, the manual

selector switch seals off air to the changeover relay.

•To manually reset the selector switch, rotate the handle until it unlatches and returns

to the normal AUTO position.

•Manual Selector Switch resets automatically when supply pressure changes back to

day time control.

Day-Night-Vent

Operation The TH 192 DNV provides a supplementary air line connection at the back of the

thermostat.

NOTE: This third line feature cannot be added to a TH 192 DN in the field.

The vent line provides either 0 or 25 psi (0 or 172 kPa) pressure via the manual selector

switch to pilot auxiliary controls. For example, a unit ventilator can provide continuous

full day operation when the space is occupied and intermittent night operation when the

space is unoccupied.

TH 192 DN Day-Night and DNV Day-Night-Vent Room Thermostat Technical Instructions

Document Number 155-067P25

October 28, 2010

Siemens Industry, Inc. Page 7

TH 192 DN and DNV

Thermostat Details

Figure 6. TH 192 DN and DNV 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 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.

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 day dial so day and night 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 adjust screw. Use a 1/16" Allen Hex

Key to adjust changeover adjust screw as follows:

a. If changeover is too high, turn off supply pressure and rotate changeover adjust

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 adjust

screw counterclockwise. One turn increases changeover point by about 3 psi

(20 kPa). Turn on supply pressure and recheck to verify new changeover point.

Technical Instructions

Document Number 155-067P25

October 28, 2010

Page 8 Siemens Industry, Inc.

Changeover Point

Adjustment,

Continued

Figure 7. 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 8. TH 192 DN and DNV

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 9. TH 192 DN and DNV

Sensitivity Adjustment.

TH 192 DN Day-Night and DNV Day-Night-Vent Room Thermostat Technical Instructions

Document Number 155-067P25

October 28, 2010

Siemens Industry, Inc. Page 9

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.

Day Time 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 daytime 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 155-067P25

October 28, 2010

Page 10 Siemens Industry, Inc.

Night Time 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 nighttime 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.

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