Installation Instructions

Document No. 129-495
Installation Instructions
October 6, 2009
Page 2 of 4 Siemens Industry, Inc.
Instructions for Option A
CAUTION:
The duct sensing element is used to
detect temperature stratification in the
duct. For proper operation, be sure to
mount the sensing element at an angle,
as shown in Figure 1.
When uncoiling the sensing element, do
NOT severely bend or kink the element.
The diameter of any bend should be no
less than six inches (152 mm).
1. Position one P/N 808-412 mounting flange on the
opposite side of the duct (near the bottom) from
where the 8 × 4-inch (200 mm × 100 mm)
mounting plate is to be mounted. See Figure 1.
Mark the four screw holes and the 1/2-inch
(13 mm) center hole of the mounting flange.
2. Drill the screw holes with the No. 27 drill bit.
3. Drill the center hole using a 1/2-inch (13 mm) drill
bit.
4. Mount the mounting flange on the duct.
5. Cut a vertical access hole 6 inches high ×
2 inches wide (150 × 50 mm) (near the top of the
duct) on the side opposite of the previously
mounted mounting flange. See Figure 1. Mark
and drill mounting screw holes for the sheet metal
plate.
Figure 1. Duct Sensing Element Mounting Arrangement,
Option A.
6. Cut a length of 3/8-inch OD hard copper tubing to
fit diagonally across the duct. Insert the tube
through the mounting flange on the 8 × 4-inch
(200 mm × 100 mm)mounting plate. Stretch out
the sensing element and fasten it to the copper
tube using the cable ties.
7. Insert the tubing and attached sensing element
through the access hole and into the mounting
flange on the opposite side. Insert the attached
sensing element through the hole located on the
mounting plate.
8. Fasten the sheet metal plate to the duct. Tighten
the securing screws on each of the mounting
flanges.
NOTE: If leakage occurs around the sheet
metal plate, use caulking, glue or liquid
gasket to seal the leak.
9. Attach the junction box and conduit; pull wires and
terminate (see Figure 4). Replace cover.
The installation is now complete.
NOTE: Inserting the duct sensing element into a
round duct requires modification of these
instructions.
Instructions for Option B
NOTE: The duct sensing element should be
mounted in a horizontal, serpentine manner
as shown in Figures 2 and 3.
1. Position and mark the screws holes for the two or
more steel straps, as shown in Figure 2.
CAUTION:
The wide part of the hanger strap must be
parallel to the airflow in the duct to ensure
minimum airflow resistance.
Figure 2. Mounting Option B from Top to Bottom.