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Return Air Smoke Detector
The factory installed Return Air Smoke Detector is installed
in the downflow discharge position for 15 to 25 ton units.
No additional field setup is required.
If a unit is to be converted to horizontal discharge, for 15 to
25 ton units, the following conversion must be performed:
1. If the unit has an economizer, it must be pulled out in
the operating position.
2. Remove the 2 screws from the mounting brackets.
Note: Refer to downflow view for screw locations of 15
to 25 ton units.
Figure 42. Downflow bracket installation (view from
horizontal return duct)
3. Lift the tube and bracket from the downflow duct
opening. Rotate the tube and bracket assembly 90
degrees ensuring that the holes on the aluminium
sensing tube face away from the unit and face the
return air ductwork.
Note: Refer to horizontal views below of the 15 to 25
ton units.
RT-SVX074A-EN
Figure 43. Horizontal bracket installation (top view of
unit)
Note: Check to insure that the flexible tubing lies flat on
the base pan surface.
4. Slide the top bracket down the aluminium sensing tube.
•
For 15 to 25 ton units with standard or low leak
economizers, also secure the tube to the top right
side of the horizontal opening flange (right side
when viewed from outside unit facing horizontal
supply). See
Figure 44, p.
Figure 44. Horizontal bracket installation (view
from horizontal return duct)
5. Using the remaining 2 screws and bracket removed in
step 2, secure the bottom bracket.
Installation
33.
33
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