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Technical Instructions
Document Number 155-021P25
September 28, 2004
Operation and
Adjustment
Temperature Setpoint
Stop
Reset Procedure
Page 2
The setpoint adjustment knob (see Figure 2) permits adjustment of the setpoint between
25°F and 215°F (-4°C and 101°C).
The temperature differential is factory set, non-adjustable, and approximately 20°F
(11°C), depending on the rate of temperature change.
The standard model includes a knob for setpoint adjustment.
The temperature setpoint stop is an integral part of these controls, and is field
adjustable. To set the stop, do the following:
1. Set dial temperature at desired stop.
2. Remove control cover.
3. Loosen the stop screw, slide the screw to the front of the control against the plastic
stop behind the dial, and tighten the screw (see Figure 2). Sometimes, an exact stop
setting is not possible, and the stop must be set to the closest stop corresponding to
the required dial setting.
Verify that the temperature has dropped to 20°F (11°C) below setpoint. Press the reset
lever to reset the unit (closing the circuit).
Cutout Stop Bracket
With Slot and Screw
Figure 1. Setpoint Stop Screw.
Reset Lever
Setpoint Window
Figure 2.
ET 141 High Limit Control Thermostat
Setpoint
Adjustment
Screw
Setpoint Knob
Siemens Building Technologies, Inc.
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