Product Overview
Technical Instruction
Document No. 155-067P25
Rev. 1, July, 1999
Page 6 Siemens Building Technologies, Inc.
Landis Division
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See the following Technical Bulletins for information on accessories.
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TB 237 Terminal Kits
TB 213 Aspirator Wall Box Kit
TB 214 Adapter Kits
TB 193 Guard Kit
TB 241 Test Head Kit
TB 167 Restrictors
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155-244
155-245
155-231
155-222
155-255
155-213
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Day-Night Operation The TH 192 DN thermostat is either direct or reverse acting for both day and night
operating modes. In a direct acting thermostat, an increase in temperature increases
the control air pressure and a decrease in temperature decreases the control pressure.
In a reverse acting thermostat, an increase in temperature decreases the control air
pressure and a decrease in temperature increases the control pressure.
The TH 192 DN provides two separate bimetal elements; one for day temperature and
one for night temperature. Each bimetal element operates independently of the other.
Use of two different supply air pressures accomplishes changeover from day to night
temperature. A supply pressure of 18 psi (124 kPa) or 25 psi (172 kPa) positions a
changeover switch so a changeover relay operates in the day or night mode
respectively.
45 50 55 60 65 70 75 80 85F
18137 24 30C
15 PSI
(103 KPA)
7.5PSI
(52 KPA)
3 PSI
(21 KPA)
TEMPERATURE
OUTPUT PRESSURE
DIRECT ACTING
FACTORY SET
POINT CONDITIONS
REVERSE ACTING
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