Installation
RT-SVX21N-EN 29
Return Air Smoke Detector
The factory installed Return Air Smoke Detector is
installed in the downflow discharge position. No
additional field setup is required.
If a unit is to be converted to horizontal discharge, 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 3 screws from the mounting brackets.
Refer to downflow view for screws locations.
3. Lift the tube and bracket from the downflow duct
opening. Rotate the tube and bracket assembly 180
degrees ensuring that the holes on the copper sensing
tube face away from the unit and face the return air
ductwork. Refer Figure 34, p. 29 and Figure 35, p. 29
for screws location.
Note: Check to insure that the flexible tubing lies flat on
the base pan surface.
4. Slide the top bracket down the copper sensing tube.
ForYSC036E-060E, andYHC036-037E units insert the
tab on the left side into the slot on the indoor coil block
off and secure the right side of the bracket with one of
the 3 screws removed in step 2. Refer to Figure 34,
p. 29. ForYHC047E-067E,YHC048E/F-060E/F,YSC072F-
Figure 32. TCO1 location (YHC120E)
Figure 33. Downflow view
CO1 limit is located above
the burner on the YHC120E models
Replace original factory installed TCO1
with optional TCO1 attached to blower
housing for field convertion to horizontal discharge
Figure 34. Horizontal view 1
Figure 35. Horizontal view 2
4
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