Data Sheet for Product

TH 192 S Single Temperature Room Thermostat Technical Instructions
Document Number 155-065P25
February 7, 2022
Siemens Industry, Inc. Page 7
Limit Stop
Adjustment
Thermostat limit stops define the
minimum and maximum thermostat
setpoints. The limit stops engage in the
setpoint cam gear teeth and cause
interference between the setpoint cam
gear and the adjustment knob gear.
To change limit stop settings, use needle
nose pliers to pull limit stop between the
setpoint cam gear teeth. Rotate limit stop
to its new position. Do not pull limit stop
any more than necessary to clear the
gear teeth. Changing the limit stop
position one gear tooth changes the limit
stop setting by 1-1/3F (0.7C).
Figure 7. TH 192 S Limit Stop
Adjustments.
Sensitivity
Adjustment
To change thermostat sensitivity, use a flat-blade
screwdriver to carefully move the sensitivity slide to
the desired position as follows:
Figure 8. TH 192 S Sensitivity
Adjustment.
Graduation
closest to the
rigid end of
the bimetal
element
4 psi/F
(50 kPa/C)
Graduation
closest to the
minimum
(MIN) end of
the bimetal
element
1 psi/F
(12 kPa/C)
NOTE: If the thermostat sensitivity is adjusted,
the thermostat must be recalibrated.
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 with, the
sensitivity changed, or is out of adjustment, use the following steps to recalibrate the
instrument.