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ET 134 Line Voltage Room Thermostats
Installation of
134-1084, 134-1085,
134-1086
Adjustments
To remove the thermostat
cover
To convert to concealed
adjustment
To set high and low range
stops
See Figure 4
Siemens Industry, Inc.
Read the Mounting and Wiring sections.
1. Do not remove the thermostat cover to install.
2. Remove the mounting plate from the back of the thermostat by unscrewing the
mounting plate locking screw (see Figure 3) with the Allen wrench provided.
3. Fasten the plate to the conduit box with the screws provided on the mounting plate.
4. Make the wiring connections to the terminals on the back of the thermostat. Terminal
number 1 identification is stamped on the terminal block. See Figure 1 for typical
wiring diagrams.
5. Hook the two slots in the back of the thermostat over the prongs of the mounting
plate. Swing the thermostat into position on the plate.
6. Tighten the mounting plate locking screw.
The installation is now complete.
1. Pull off the knob.
2. Loosen the thermostat cover screw with the Allen wrench provided.
1. Remove the thermostat cover by loosening the Allen screws at the top and bottom of
the thermostat. The Allen wrench is included with the thermostat.
2. Peel off the backing from the enclosed faceplate.
3. Position the new faceplate over the factory-installed faceplate.
4. Press firmly onto the cover.
5. Set the thermostat dial by lining up the desired set point at the nine o'clock position.
6. Replace the cover and tighten the thermostat cover screw.
1. Before the cover is removed, set the dial to the maximum stop setting.
2. Pull off the knob.
3. Hold the dial firmly, press tab "A", and rotate the tab clockwise until it stops against
stop "C".
4. Release the tab and be sure it snaps into the desired notch.
5. Set the dial at the lowest temperature stop setting desired.
6. Hold the dial firmly, press tab "B" and rotate it counter clockwise until it stops against
stop "C".
7. Release the tab and be sure it snaps into the desired notch.
8. Replace the cover, tighten the cover screw, and push on the knob.
9. Rotate the knob to the desired setting.
Figure 4. Interior of 134-1084, 134-1085 and 134-1086 Thermostats with High
and Low Adjustment Stops.
Technical Instructions
Document Number 155-017P25
August 27, 2021
Page 7
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