TH 192 DN Day-Night and DNV Day-Night-Vent Room Thermostat
Technical Instructions
Document Number 155-067P25
October 28, 2010
Siemens Industry, Inc.
Page 9
Thermostat
Calibration
The thermostat is factory calibrated to a control pressure of 7.5 psi (52 kPa) when the
setpoint and the ambient temperature are both at 72°F (22°C). The factory sensitivity
setting is approximately 2.5 psi/
°
F (31 kPa/
°
C). No adjustments are required if these
settings are appropriate for the application. If the thermostat has been tampered, the
sensitivity changed, or is out of adjustment, use the following steps to re-calibrate the
instrument.
Day Time Calibration
Step 1
—
Remove cover using 192-632
calibration tool. Verify room
temperature is between 70 and 80
°
F
(21 and 27
°
C).
Step 2
—
Verify that supply pressure is 18 psi (124 kPa).
Set daytime dial to room temperature by turning
the exposed adjustment knob or using a hex key
as shown. Allow thermostat to stand for about five
minutes to adjust to the new setting.
Step 3
—
Moisten needle and insert 192-633
test gauge and needle adapter in the
test port. Read control pressure.
Step 4
—
If control pressure does not read 7 to 8 psi (48 to
55 kPa), turn calibration screw using 192-632
calibration tool or 1/8” (3.2 mm) wrench until
pressure is 7 to 8 psi (48 to 55 kPa). The sensing
element is now in calibration and the setpoint can
be changed to the desired room temperature.