The TH 192 Pneumatic Room Thermostat Retrostat
kits convert most existing pneumatic room
thermostats to a Powers™ Controls TH 192 direct or
reverse acting, two-pipe, single setpoint device. This
kit includes a cover that can be configured to
conceal or expose the setpoint adjustments, setpoint
indicator, and thermometer. Also, the kits can
include an optional 1/2-inch large, exposed setpoint
adjustment knob.
Required Tools
• Calibration and cover screw wrench
• Medium flat-blade screwdriver
• Small level
• Accurate thermometer
• Needle nose pliers
Document No. 129-116
September 24, 2009
(192-632) or 1/16” Allen wrench and 1/8”
open-end wrench
192-840 Direct Acting Fahrenheit Scale
192-841 Reverse Acting Fahrenheit Scale
192-850 Direct Acting Celsius Scale
192-851 Reverse Acting Celsius Scale
NOTES:
1. Includes all parts needed for all conversions
listed in Table 1 including instal lat ions wher e a
large rough-in hole must be covered. These
installations may require an adapter frame
(192-308).
2. For Retrostat Kits with white cover, order the
standard kit with “W” suffix.
Type
Prerequisites
•Review all of these instructions before you
begin installation.
•Check job drawings for any site-specific
information.
•Verify that the existing thermostat installation
has its supply and return air lines connected
properly.
•Make certain air supply is 18 to 25 psi
(124 to 172 kPa) normal.
•Obtain the installation instructions provided
with the thermostat in the Retrostat Kit. The
document provides instructions for calibrating
the thermostat.
•Make certain a supply of wall anchors and
plastic ties are available.
3. For Retrostat Kits with optional 1/2-inch large,
exposed setpoint adjustment knob, order the
standard kit with “K” suffix.
Item Number 129-116, Rev. FAPage 1 of 12
Expected Installation Time
1 hour
Page 2
Document No. 129-116
Installation Instructions
September 24, 2009
Installation
The following general procedures apply to all
thermostat installations. Notice that some
installations require the use of the adapter frame
(192-308) to cover paint lines, broken walls, etc. For
installations not included in this document, remove
the existing terminal and connect directly to the
tubing (see Figure 1).
Removing Existing Thermostat
1. Remove the existing thermostat from the wall.
2. Remove the terminal head and the gasket from
the fitting.
3. Clean the surface of the fitting, if required.
Installing New Thermostat
See Figure 1 for typical thermostat installation.
1. Table 1 lists the figures that correspond to a
particular thermostat application. See the
appropriate figure to identify the mounting parts.
2. Complete the required air line connections as
necessary. Secure all conn ections and insta ll
the plug-in adapters into the 5/32-inch (4 mm)
plastic tube. Use the blue adapter for the supply
air line (Figure 1).
NOTE: Either polyethylene (hard, black) or
polyurethane (soft, clear) tubing is
recommended. The appropriate tubing
depends on which is most compatible for
the application.
6. Using mounting screws supplied with the
thermostat chassis, install the wall plate on
adapter base as follows:
a. Guide screws through the slotted key holes
on the wall plate and partially insert them
into the adapter base.
b. Orient the wall plate so that it is square and
level.
c. Tighten the mounting screws to secure the
wall plate in place.
7. 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.
8. Configure the cover per installation instructions
provided and mount the cover over the
thermostat.
NOTE: For applications that use the 1/2-inch
large setpoint adjustment knob, align
the key hole in the cover over the
shaft protruding from the thermostat
when mounting the cover (see
Figure 1).
Use either the hex key end of the calibration and
cover screw wrench or a 1/16-inch A llen wre nc h
to tighten the two screws that secure the cover
in place.
3. Place the multi-slotted metal plate into the
plastic adapter frame (plastic frame may or may
not be required). Attach the multi-slotted plate to
the terminal head or the wall using screws and
slots shown in Figures 3 through 26.
4. Loosely screw adapter base to the multi-slotted
plate.
5. Draw plastic tubing through the multi-slotted
plate and the adapter base. Install the plug-in
adapters on the wall plate.
Page 2 of 12 Siemens Industry, Inc.
Page 3
Document No. 129-116
Installation Instructions
September 24, 2009
Table 1. Retrostat Kit Thermostat Types.
Thermostat Type Type of
Terminal
Powers Controls
TH 192 with guard
Powers Controls
TH 832D (See
Note 1)
Powers Controls
TH 180, TH 182,
TH 192 to convert
from horizontal to
vertical installation
1. Use of an adapter frame (192-308) may be
required to cover up large rough-in holes.
2. For replacement of thermostats not listed, use
the Powers Universal Adapter Kit (192-300),
Powerstar Thermostat, and Powerstar
Thermostat. Consult you local Siemens Building
Technologies representative for details.
3. Place the optional 1/2-inch large setpoint
adjustment knob on the shaft protruding
through the cover. Use either the hex key end
of the calibration and cover screw wrench or a
1/16-inch Allen wrench to tighten the set screw
on the knob.
4. Install the optional guard over the thermostat
per Figure 2.
NOTES:
1. In applications with a 1/2-inch large setpoint
adjustment knob, whenever you remove the
thermostat cover, first remove the adjustment
knob by loosening its set screw with either the
hex key end of the calibration and cover screw
wrench or a 1/16-inch Allen wrench.
2. To remove the thermostat from the wall plate,
hold the thermostat firmly at the top and bottom
and start to pull the thermostat from the wall
plate. At the same time, use a screwdriver to
pry the wall plate latch arms away from the
thermostat chassis and pull the thermostat
away from the wall plate.
3. Frequent removal and installation of the
thermostat can bend the latch arms beyond
their operating positions. If this occurs, bend the
latch arms back to their operating positions
before mounting the thermostat.
The installation is complete.
Siemens Industry, Inc. Page 3 of 12
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Document No. 129-116
Installation Instructions
September 24, 2009
Calibration, Adjustme nt , and
Troubleshooting
See the installation instructi ons pro vided wit h the
thermostat in this retrostat kit for the following
procedures:
• Thermometer Calibration
• Changeover Point Adjustment
• Limit Stop Adjustment
• Sensitivity Adjustm ent
• Thermostat Cooling/Heating Calibration
• Troubleshooting
Reference
Technical Bulletin Document Number
TB 214 TH 192 Adapter Kits 155-231
Figure 1. Typical Thermostat Installation.
Page 4 of 12 Siemens Industry, Inc.
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Document No. 129-116
Installation Instructions
September 24, 2009
1. Put the flat side of the frame against the wall. Mark the four hole locations and drill each hole 1/4 × 1-inch
deep.
2. Insert each anchor through the frame and into its respective hole. Drive the expander nails to secure the
frame in place. To uninstall the frame, remove the expander nails by turning them counterclockwise.
3. Mount the cover over the frame and secure in place by turning each end locking screw five turns
counterclockwise.
Figure 2. TH 192 Installation with Guard.
NOTE: Adapter Frame, Adapter Base, and Plug-in Adapter (2) not shown. See Figure 1 for proper installation.
Siemens Industry, Inc. Page 5 of 12
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Document No. 129-116
Installation Instructions
September 24, 2009
Figure 3. TH 832D Flush Installation.
NOTE: Adapter Base and Plug-in Adapter (2) not
shown. See Figure 1 for proper installation.
Figure 4. TH 180, TH 182, T H 192 Horizontal to Vertical
Flush Installation.
NOTE: Adapter Base and Plug-in Adapter (2) not
shown. See Figure 1 for proper installation.
Figure 5. TH 180, TH 182, T H 192 Horizo ntal to Vertical
Surface Installation.
Page 6 of 12 Siemens Industry, Inc.
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Document No. 129-116
Installation Instructions
September 24, 2009
NOTE: Plug-in Adapter (2) not shown. See Figure 1 for proper installation.