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ET 141 High Limit Control Thermostat
Installation
Siemens Building Technologies, Inc.
1. Select a mounting location for the thermostat in the duct (or plenum). The location
must allow the sensing element to measure the average temperature in the duct.
2. Drill (or cut) a 1-3/8 inch hole in the duct at the selected mounting location (see
Figure 3).
3. Using the flange as a template on the duct, mark the location for two #10 × 1/2" long
sheet metal screws.
4. Punch (or drill) both sheet metal screw holes in the duct at the marked locations.
5. Secure the flange to the duct with the two #10 × 1/2" long sheet metal screws
provided.
6. Insert the sensing element and sleeve through the flange installed in Step 5 (and
into the duct).
7. Secure the thermostat to the flange by screwing the set screw firmly against the
sleeve. Do not over-tighten the set screw.
NOTE:
Insert the sensing element as far as possible into the air stream without
allowing it to contact any object inside the duct. Provide at least 5-3/4 inch
(14 cm) clearance between the sensor and any other objects inside the
duct.
Sensing Element
141-0530
Duct
Sheet Metal Screw Hole
Set Screw
Flange
Sheet Metal Screw
Sleeve
Figure 3. Installation.
Technical Instructions
Document Number 155-021P25
September 28, 2004
1-3/8 in. Hole
Page 3
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