Installation
28 RT-SVX21N-EN
3. Using self-drilling screws, (or screws removed from
duct cover), screw through dimples to attach DUCT
COVER to base.
4. On original RETURN DUCT COVER, apply ¼”(6mm.)
continuous bead of 500°F RTV sealant around flange
(opposite insulation side), as shown.
5. Slide RETURN DUCT COVER (insulation side up) into
supply opening until inward edge of duct cover
engages with the 2 retaining clips on the duct flange.
Secure outward edge of the duct cover with two
screws.
Note: If unit is equipped with Return Air Smoke Detector,
refer to field conversion instructions for horizontal
discharge before installing return air duct.
Note: If unit is equipped with Discharge Air Sensing
option refer to the following figure for proper tube
positioning based on unit tonnage.
6. After completing installation of the duct covers for
horizontal discharge, proceed toTCO-1 instructions.
TCO1 Instructions
If the unit being installed is listed in the following list, the
limit controlTCO1 must be replaced with the extra limit
control shipped in the heater compartment. ReplaceTCO1
following the instructions in steps 1 through 3 below. If the
unit being installed does not correspond to any in the
following list, skip steps1 through 3 and go on to next step
in the installation process.
Unit Model Number
YSC072F**(H,Z),YSC092F**(M,Y),YSC092F**(H,Z),
YSC102F**(M,Y),YSC102F**(H,Z),YSC120F**(L,X),
YSC120F**(H,Z),YSC090F**(L,X),YHC092F(M,Y),
YHC102F**(M,Y),YHC120E**(L,X),YHC120E**(H,Z).
1. Remove the heat section access panel.
2. RemoveTCO1 from shipping location, attached to the
combustion blower.
3. Replace and discard the existingTCO1 originally
installed at the factory for down flow operation with
theTCO1 shipped attached to the combustion blower
for horizontal operation.
4. Replace heat section access panel.
Figure 28. Duct cover
Figure 29. Duct cover
Figure 30. For YSC120F*R and YHC092F, 102F models
Supply Duct Cover
Screw into 4
dimples on top
edge
RTV Sealant
Downow application
Horizontal application
Figure 31. Supply and return covers
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious injury.
Insulation side
down
Supply duct cover
Insulation side up
Return duct
cover
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