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129-077
Installation Instructions
Rev. 2, November, 1999
N N N N i i i i gh
ght t t t T T T T i i i i m m m m e e e e C C C C a a a a li li li lib b b b r r r r a a a a t t t t i i i i on
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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 (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.
D D D D i i i i m m m m en
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F F F F i i i i gu
gur r r r e e e e 6 6 6 6 . . . . T T T T H H H H 1 1 1 1 9 9 9 9 2 2 2 2 DN
DN a a a a n n n n d d d d DN
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( ( ( ( M M M M i i i i l l l l l l l l i i i i m m m m e e e e t t t t e e e e r r r r s s s s ). ). ). ).
R R R R e e e e f f f f e e e e r r r r en
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D D D D o o o o c c c c u u u u m m m m e e e e n n n n t t t t
TH192-4, TH192 DN Day-Night and TH192
DNV Day-Night-Vent Room Thermostat
Technical Instructions
TB 214, TH192 Adapter Kits Technical
Bulletin
TB 237, Accessories for Installation of
TH192, TH193, or TH194 Room
Thermostats Technical Bulletin
Powerstar Thermostat Covers —
Color Reference Guide
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.
S S S S i i i i e e e e m m m m en
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Landis and Staefa Division
1000 Deerfield Parkway
Buffalo Grove, IL 60089-4513
U.S.A.
DNV V V V D D D D i i i i m m m m e e e e n n n n s s s s i i i i o o o o n n n n s s s s i i i i n n n n I I I I n n n n c c c c h h h h e e e e s s s s
DN
DN
N N N N u u u u m m m m b b b b e e e e r r r r
155-067P25
155-231
155-244
152-178P10
T T T T r r r r oub
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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
CAU U U U T T T T IO
ION N N N : : : :
CA
CA
IO IO
If you use the wrong test port, thermostat
damage can occur and result in
replacement of the device.
T T T T a a a a b b b b l l l l e e e e 1 1 1 1 . . . . T T T T r r r r o o o o u u u u b b b b l l l l e e e e s s s s h h h h oo
P P P P r r r r o o o o b b b b l l l l e e e e m m m m
C C C C he
heck ck ck ck
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he
Control
Air supply
pressure stays
at
Nozzle or
approximately
flapper
zero
Restrictor
Calibration Out of
Nozzle
Control
pressure stays
at
approximately
Calibration Dirt on either
supply pressure
Excessive air
Supply and
leakage from
return line
exhaust port on
connection
left side of
thermostat
Document No. 129-077
Printed in the U.S.A.
P P P P a a a a ge
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oot t t t i i i i n n n n g g g g G G G G u u u u i i i i d d d d e e e e . . . .
oo
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C C C C a a a a u u u u s s s s e e e e
A A A A c c c c t t t t i i i i on
on
on
on
Low supply
As required
pressure
Dirt on nozzle
Clean nozzle
or flapper
or replace
thermostat
Clogged
Replace
restrictor
restrictor
Recalibrate
calibration
Clogged
Clean nozzle
nozzle
or replace
thermostat
Alternately
supply or
close and
exhaust valve
open nozzle
seat
by gently
pushing down
the bimetal
Connections
As required
are
interchanged
or connection
to port is
incorrect
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