Installation Instructions

Document No. 129-077
Installation Instructions
September 23, 2009
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. Product or company names mentioned herein may be the trademarks of their respective owners. ©
2009 Siemens Industry, Inc.
Siemens Industry, Inc.
Building Technologies Division
1000 Deerfield Parkway
Buffalo Grove, IL 60089-4513
U.S.A.
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Document No. 129-077
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Page 4 of 4
Night Time Calibration
1. If not already done, remove the cover using the
calibration tool. Verify that the room temperature is
between 70 and 80°F (21 and 27°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) using the
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.
Dimensions
Figure 6. TH192 DN and DNV Dimensions in Inches
(Millimeters).
Reference
Document
Number
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
Troubleshooting
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.
CAUTION:
If you use the wrong test port, thermostat
damage can occur and result in
replacement of the device.
Table 1. Troubleshooting Guide.
Problem
Check
Cause
Action
Control
pressure stays
at
approximately
zero
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
Calibration Out of
calibration
Recalibrate
Control
pressure stays
at
approximately
supply pressure
Nozzle Clogged
nozzle
Clean nozzle
or replace
thermostat
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