Data Sheet for Product

Free Energy Band TH 193 HC Heating/Cooling Room Thermostat Technical Instructions
Document Number 155-068P25
February 14, 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 the 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 193 HC
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 193 HC
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.