Product Overview

Technical Instruction
Document No. 155-067P25
Rev. 1, July, 1999
Page 2 Siemens Building Technologies, Inc.
Landis Division
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•
Fixed temperature limit stops meet government specifications
•
Metal covers available in standard configurations with a variety of finishes
•
Competitor adapter mounting kits available
•
All thermostat chassis available with optional 1/2” large set point adjustment knobs
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TH 192 DN & DNV thermostats provide day to night (or weekend) temperature setback
to control pneumatic valve and damper actuators in heating and cooling applications
(Figure 1) such as air conditioners, space heaters, unit ventilators, and air volume
controllers.
The day-night thermostat is particularly useful in locations where all rooms in a zone are
not vacated at the same time. Using time clocks on evenings and weekends to reset
the control system to the night mode ensures optimum energy management. When a
zone is operating in maximum economy mode at night, an occupant can reset an
individual space to day temperature by switching a manual override. During night
control, the TH 192 DNV provides a separate output signal (full air supply) which allows
ventilation to occur.
TH 192 DN & DNV thermostats maintain maximum economy and occupant comfort
automatically as a day progresses from the day time set point (65 to 68
°
F, 18 to 20
°
C)
to the night time set point (55 to 60
°
F, 13 to 16
°
C). The thermostats are available with
covers that conceal or expose the set point adjustment dials.
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0 Psig (0 kPa) Day (S = 18 Psig, 124 kPa) B - D
0 Psig (0 kPa) Night Occupied B - D
Full Air Supply Night (S = 25 Psig, 172 kPa) A - D