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Siemens Industry, Inc.

POWERS

™

CONTROLS

Technical Instructions

Document No. 155-067P25

TH 192-3

February 11, 2022

TH 192 DN Day-Night and

TH 192 DNV Day-Night-Vent

Room Thermostat

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.

Summary of content (13 pages)

PAGE 1
Technical Instructions Document No. 155-067P25 TH 192-3 February 11, 2022 POWERS™ CONTROLS TH 192 DN Day-Night and TH 192 DNV Day-Night-Vent Room Thermostat 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.
PAGE 2
Technical Instructions Document Number 155-067P25 February 11, 2022 Optional Design Features Application TH 192 DN Day-Night and DNV Day-Night-Vent Room Thermostat • Fixed temperature limit stops meet government specifications. • Metal covers available in Desert Beige. • Competitor adapter mounting kits available. • Some thermostat chassis are available with optional, 1/2-inch, large setpoint adjustment knobs.
PAGE 3
TH 192 DN Day-Night and DNV Day-Night-Vent Room Thermostat Technical Instructions Document Number 155-067P25 February 11, 2022 Piping Figure 2. TH 192 DN Thermostat Connections. Figure 3. TH 192 DNV Thermostat Connections. Product Numbers and Ordering Information See Table 2 for product number and ordering information on TH 192 DN and DNV thermostat chassis. Chassis 2. Is the day and nighttime control direct or reverse acting? 1. Is a Fahrenheit or Celsius scale required? 3.
PAGE 4
Technical Instructions Document Number 155-067P25 February 11, 2022 Covers TH 192 DN Day-Night and DNV Day-Night-Vent Room Thermostat 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.
PAGE 5
TH 192 DN Day-Night and DNV Day-Night-Vent Room Thermostat Specifications Accessories Technical Instructions Document Number 155-067P25 February 11, 2022 Control action Operating ranges Supply air pressure, maximum Normal air supply pressure Day Night Sensitivity adjustment Nominal air consumption, two-pipe Temperature Storage temperature Ambient operating temperature Temperature response Dial graduations Factory settings Calibration @ 72°F (22°C) See Table 2.
PAGE 6
Technical Instructions Document Number 155-067P25 February 11, 2022 TH 192 DN Day-Night and DNV Day-Night-Vent Room Thermostat 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.
PAGE 7
TH 192 DN Day-Night and DNV Day-Night-Vent Room Thermostat Technical Instructions Document Number 155-067P25 February 11, 2022 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 the pointer tip indicates the correct room temperature.
PAGE 8
Technical Instructions Document Number 155-067P25 February 11, 2022 TH 192 DN Day-Night and DNV Day-Night-Vent Room Thermostat 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.
PAGE 9
TH 192 DN Day-Night and DNV Day-Night-Vent Room Thermostat Thermostat Calibration Technical Instructions Document Number 155-067P25 February 11, 2022 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.
PAGE 10
Technical Instructions Document Number 155-067P25 February 11, 2022 TH 192 DN Day-Night and DNV Day-Night-Vent Room Thermostat Night Time Calibration Page 10 Step 1 — If not already done, remove the cover using the 192-632 calibration tool. Verify that the room temperature is between 70 and 80F (21 and 27C). Step 2 — Verify that the supply pressure is 25 psi (172 kPa). Set the nighttime dial to room temperature by turning the exposed adjustment knob or using a hex key as shown.
PAGE 11
TH 192 DN Day-Night and DNV Day-Night-Vent Room Thermostat Troubleshooting Technical Instructions Document Number 155-067P25 February 11, 2022 Before troubleshooting the thermostat per Table 5, ensure that there is clean, dry supply air at 18 psi (124 kPa) for day control, and 25 psi (172 kPa) for night. Use the test probe gauge and needle adapter to measure the control pressure at the thermostat test port.
PAGE 12
Technical Instructions Document Number 155-067P25 February 11, 2022 Chassis Tube Connector and Restrictor Plate Replacement TH 192 DN Day-Night and DNV Day-Night-Vent Room Thermostat 1. Remove the thermostat chassis from the wall. The 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 the two Phillips head screws from the connector on back of the thermostat chassis.
PAGE 13
TH 192 DN Day-Night and DNV Day-Night-Vent Room Thermostat Service Parts (Continued) Technical Instructions Document Number 155-067P25 March 23, 2018 Description Part Numbers Plug-in adapters for quick thermostat removal Straight, blue (package of 20) 192-485 Straight, white (package of 20) 192-486 Compression ring (package of 100) 141-388 Elbow (provides quick return for wall surface mounting), blue (package of 20) 192-487 Elbow (provides quick return for wall surface mounting), white (package