Siemens Powers TH 192 S User manual

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Document No. 129-075
Rev. 2, November, 1999
TH192 S Single Temperature Room Thermostat
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The TH192 S thermostats are proportional single output,
single set point, 1-pipe (low air capacity) or 2-pipe (high air
capacity) temperature controllers. Each TH192 chassis
includes a wall plate for thermostat installation using a
variety of rough-in installation kits.
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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 S thermostat and the 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 TH192 S does not use the “R2” air line connection.)
The thermostat plugs into the terminal adapters on the
wall plate. The Piping section of this document shows
typical connections.
Two cover screws plus the 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.

129-075
Installation Instructions
Rev. 2, November, 1999
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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 a 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, the
5/32” (4 mm) tubing can connect directly to the
thermostat chassis. Use compression rings (part
number 141-388) to secure the connections.
When converting from a competitor model to the
TH19X, you need:
•TH192 Chassis.
•A new cover.
•Adapter Kit (see TB-214, TH192 Adapter Kits
Technical Bulletin, 155-231).
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: All piping (see Figures 2
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must comply with the local
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129-075
Installation Instructions
Rev. 2, November, 1999
Siemens Building Technologies, Inc.
..
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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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: Avoidbreathingonortouchingthebimetal
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reading.
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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 a 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 steps
to recalibrate the instrument.
The output pressure test port (Figure 5) is accessible
without removing the thermostat cover through the 8th
opening:
•Forone-pipethermostats,thetestportisontheright
side.
•For two-pipe thermostats, the test port is on the left
side.
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If you use the wrong test port, thermostat
damage can occur and result in
replacement of the device.
1. Make certain that the air supply is 25-30 psi
(172-207 kPa).
2. Remove the cover using the calibration tool. Verify that
the room temperature is between 70 and 80°F(21and
27°C).
3. Verify that the supply pressure is 18 psi (124 kPa). Set
the 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.
4. Moisten the needle and insert the test gauge and
needle adapter in the output pressure test port
(Figure 5). Read the control pressure.
5. 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-inch (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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129-075
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. 129-075
Printed in the U.S.A.
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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 the output 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:
•Forone-pipethermostats,theportisontheright side.
•For two-pipe thermostats, the port is on the left side.
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:
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
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TH192-1, TH192 S Single Temperature
Room Thermostat Technical Instructions
155-065P25
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