Siemens TH 192 DN User manual

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Document No. 129-077
Rev. 2, November, 1999
TH192 DN Day-Night and TH192 DNV
Day-Night-Vent Room Thermostat
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The TH192 DN and TH192 DNV thermostats are
proportional single output, dual set point, 2-pipe or 3-pipe
(high air capacity) temperature controllers. Each TH192
DN and DNV chassis includes a wall plate for thermostat
installation in a variety of rough-in installation kits.
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TH192 DN and TH192 DNV
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•Review all instructions before beginning
installation.
•Verify job drawings are available to reference
specific job site information as needed.
•Verify rough-in installation kits (wall-box or tubing
runs) are pre-installed.
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•Medium flat blade screwdriver
•Needle nose pliers
•Small level
•Calibration and Cover Screw Wrench or 1/16”
Allen wrench (192-632)
•NeedleProbewith1-1/2”diameter,0to30psig
(0 to 200 kPa) test gauge (192-633)
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NG Personal injury/loss of life may
occur if a procedure is not
performed as specified.
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NEquipment damage, or loss of
datamayoccuriftheuser
does not follow procedure as
specified.
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The TH192 DN/DNV thermostat and wall plate mount
vertically to a wall using a variety of rough-in installation
kits (for example, wall box kits or tubing terminal kits). The
ends of the air lines from the rough-in installation kits have
terminal adapters that snap into the wall plate. Terminal
adapters also are available separately as orderable
accessories. (Note that certain retrofit applications allow
air connections directly to the thermostat chassis).
The “S”, “R1”, and “R2” labels on both the thermostat
chassis and the wall plate identify the air line connections.
The thermostat plugs into the terminal adapters on the
wall plate. The Piping section of this document shows
typical connections.
Two cover screws plus latch arms on the wall plate hold
the thermostat in place. The cover fits over the thermostat
and the two cover screws fasten it to the wall plate.
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The following procedure is for a typical thermostat
installation and assumes the rough-in installation kit is in
place. See Figure 1.
1. The rough-in installation kit provides a supply (blue) air
line and a return air line joined by an air link. Remove
the terminal adapters from the air link and snap them
into the wall plate at their respective locations.
2. Using the mounting screws supplied with the
thermostat chassis, install the wall plate on the wall
as follows:
a. Guide the screws through the slotted key holes
on the wall plate and partially insert them into
wall.
b. Orient the wall plate so that it is square and level.
c. Tighten the mounting screws to secure the wall
plate in place.
3. Moisten the thermostat supply and return ports to
lubricate them. Carefully insert the thermostat ports
into the terminal adapter “O” rings on the wall plate.

129-077
Installation Instructions
Rev. 2, November, 1999
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4Siemens Building Technologies, Inc.
4. Mount the cover over the thermostat.
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::
: For applications that use the 1/2-inch large
set point adjustment knob, align the key
hole in the cover over the shaft protruding
from the thermostat when mounting the
cover.
Use the hex key end of the calibration and cover screw
wrench or a 1/16” Allen wrench to tighten the two
screws that secure the cover in place.
5. Place the optional 1/2-inch large set point adjustment
knob on the shaft protruding through the cover. Use
the hex key end of the calibration and cover screw
wrench or a 1/16” Allen wrench to tighten the set
screw on the knob.
The installation is complete.
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When converting from Model TH180 or TH182 to the
TH19X, you need:
•TH192 Chassis.
•A new cover. The TH180 or TH182 cover does not
fit the TH19X chassis or vice versa.
•Terminal adapters. These adapters are required to
retain the plug-in feature only. Otherwise, 5/32”
(4 mm) tubing can connect directly to the
thermostat chassis. Use compression rings (part
number 141-388) to secure connections.
When converting from competitor models to the TH19X,
you need:
•TH19X Chassis.
•A new cover.
•Adapter Kit (see TB-214, TH192 Adapter Kits
Technical Bulletin, 155-231).
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:Allpiping(
Figures 2 and 3) must conform to
local codes and regulations and must comply
with the local authority having jurisdiction.
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1. Use a test thermometer to read the current
room temperature.
2. Place a screwdriver in the center of the
thermometer assembly (Figure 4). Carefully
rotate the thermometer assembly until the
pointer tip indicates the correct room
temperature.
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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 a pressure gauge or a 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 the current change over point.
Turn the day dial so that the day and night
control pressures are different. Then note the
changeover point on the control gauge as the
supply pressure changes.

129-077
Installation Instructions
Rev. 2, November, 1999
Siemens Building Technologies, Inc. `P
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3. Place an Allen wrench in opening of the thermometer
assembly (Figure 4) to adjust the changeover
adjustment screw as follows:
a. If the changeover is too high, turn off the supply
pressure and rotate the changeover adjust screw
clockwise. One turn decreases the changeover
point by about 3 psi (20 kPa). Turn on the supply
pressure and recheck to verify the new
changeover point.
b. If the changeover is too low, turn off the supply
pressure and rotate the changeover adjust screw
counterclockwise. One turn increases the
changeover point by about 3 psi (20 kPa). Turn on
the supply pressure and recheck to verify the
new changeover point.
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Thermostat limit stops define the minimum and maximum
thermostat set points. The limit stops engage in the set
point cam gear teeth and cause interference between the
set point cam gear and the adjustment knob gear.
To change the limit stop settings, use needle nose pliers to
pull the limit stop (Figure 4) between the set point cam
gear teeth. Do not pull the limit stop any more than
necessary to clear the gear teeth. Rotate the limit stop to
its new position. Changing the limit stop position one gear
tooth changes the limit stop setting by 1-1/3°F(0.7°C).
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The factory thermostat sensitivity setting is approximately
2.5 psi/°F (31 kPa/°C). To change the sensitivity, use a flat
blade screwdriver to carefully move the sensitivity slide
(Figure 4) to the desired position as follows:
Graduation closest
to the rigid end of
the bimetal element
4psi/
°F (50 kPa/°C)
Graduation closest to
the minimum (MIN) end
of the bimetal element
1psi/
°F (12 kPa/°C)
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: If the thermostat sensitivity is adjusted,
recalibrate the thermostat.
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The thermostat is factory calibrated to a control pressure of
7.5 psi (52 kPa) when the set point and the ambient
temperature are both at 72°F (22°C). No adjustments are
required if these settings are appropriate.
If the thermostat has been tampered, the sensitivity
changed, or it is out of adjustment, use the following
procedures to recalibrate the instrument.
The output pressure test port (Figure 5) is accessible
without removing the thermostat cover through the 8th
opening from the top as follows:
•For TH192 DN and DNV thermostats, the test port is
on the left side.
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damage can occur and result in
replacement of the device.
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1. Remove the cover using the calibration tool. Verify that
the room temperature is between 70 and 80°F(21and
27°C).
2. Verify that the supply pressure is 18 psi (124 kPa). Set
the day time dial to the room temperature by turning
the exposed adjustment knob or using a hex key.
Allow the thermostat to stand for about five minutes to
adjust to the new setting.
3. Moisten the needle and insert the test gauge and
needle adapter in the test port (Figure 5). Read the
control pressure.
4. If the control pressure does not read 7 to 8 psi (48 to
55 kPa), turn the calibration screw (Figure 4)usingthe
calibration tool or 1/8” (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 set point can be
changed to the desired room temperature.

129-077
Installation Instructions
Rev. 2, November, 1999
Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models
as design improvements are introduced. © 1999 Siemens Building Technologies, Inc.
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...
Landis and Staefa Division
1000 Deerfield Parkway
Buffalo Grove, IL 60089-4513
U.S.A.
Document No. 129-077
Printed in the U.S.A.
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1. If not already done, remove the cover using the
calibration tool. Verify that the room temperature is
between 70 and 80°F(21and27°C).
2. Verify that the supply pressure is 25 psi (172 kPa). Set
the night time dial to the room temperature by turning
the exposed adjustment knob or using a hex key.
Allow the thermostat to stand for about five minutes to
adjust to the new setting.
3. Moisten the needle and insert the test gauge and
needle adapter in the test port (Figure 5). Read the
control pressure.
4. If the control pressure does not read 7 to 8 psi (48 to
55 kPa), turn the calibration screw (Figure 4)usingthe
calibration tool or a 1/8” (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 set point can be
changed to the desired room temperature.
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TH192-4, TH192 DN Day-Night and TH192
DNV Day-Night-Vent Room Thermostat
Technical Instructions
155-067P25
TB 214, TH192 Adapter Kits Technical
Bulletin
155-231
TB 237, Accessories for Installation of
TH192, TH193, or TH194 Room
Thermostats Technical Bulletin
155-244
Powerstar Thermostat Covers —
Color Reference Guide
152-178P10
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Before troubleshooting the thermostat per Table 1, make
certain 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 output pressure test port
(Figure 5). The output pressure test port is accessible
without removing the thermostat cover through the 8th
opening from the top as follows:
•For TH192 DN and DNV thermostats, the port is on the
left side.
CA
CACA
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UT
TT
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ION
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N:
::
:
If you use the wrong test port, thermostat
damage can occur and result in
replacement of the device.
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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