Technical Instructions
Document Number 155-067P25
October 28, 2010
Page 2
Siemens Industry, Inc.
Optional Design
Features
•
Fixed temperature limit stops meet government specifications.
•
Metal covers available in Desert Beige or white finish.
•
Competitor adapter mounting kits available.
•
Some thermostat chassis are available with optional, 1/2-inch, large setpoint
adjustment knobs.
Application
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 setpoint (65
°
F to 68
°
F, 18
°
C to
20
°
C) to the night time setpoint (55
°
F to 60
°
F, 13
°
C to 16
°
C). The thermostats are
available with covers that conceal or expose the setpoint adjustment dials.
Figure 1. Typical TH 192 DN & DNV Thermostat Applications.
Table 1. Typical TH 192 DNV Thermostat Application.
Chassis Port R2
Pressure
Operation Mode (Air
Supply)
Switching Relay
Connection
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
