Installation
RT-SVX22J-EN 27
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 screw 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 to horizontal views below.
Table 4. TCO-A replaced for horizontal duct
configuration
Unit Model
Number
Electric Heater
Model Number TCO-A location
TSC120F4, THC092F
BAYHTRA418, 427,
436, 454
Right
TSC120FW
BAYHTRAW18A, 36A,
54A
Right
THC072F4 BAYHTRU427, 436 Center
TSC090F4 BAYHTRW427, 436 Center
TSC090FW BAYHTRWW27, W36 Center
Figure 31. TCO-A location
Figure 32. Downflow view
Figure 33. Horizontal view 1
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