Return Air Smoke Detector - American Standard YSC036A Installation, Operation And Maintenance Manual

Installation
2. Place SUPPLY DUCT COVER over
down-flow return opening.
(insulation side down)
3. Using self-drilling screws, (or
screws removed from duct
cover), screw through dimples to
attach DUCT COVER to base.
Figure 17.
Supply Duct Cover
Screw into 4
dimples on top
edge
4. On original RETURN DUCT
COVER, apply ¼"(6mm.)
continuous bead of 500°F RTV
sealant around flange (opposite
insulation side), as shown.
Figure 18.
RTV Sealant
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: Note: Certain unit/electric
heater combinations require
a limit switch change out for
horizontal airflow
applications. Refer to the
following instructions to
determine if this process is
RT-SVX21F-EN
required for the unit
undergoing installation.
6. After completing installation of
the duct covers for horizontal
discharge, proceed to TCO-1
instructions.
Figure 19. Duct cover
Return duct
Insulation side up
cover
TCO1 Instructions:
If the unit being installed is listed in
the following table the limit control
TCO1 must be replaced with the
extra limit control shipped in the
heater compartment. Replace TCO1
following the instructions in steps
1through 3 below. If the unit being
installed does not correspond to any
in the following table, skip steps1
through 3 and go on to next step in
the installation process.
Unit Model Number
Y*C072A**(H,Z), YHC092A**(M,Y),
YHC092A**(H,Z), YSC090A**(H,Z),
YSC092A**(H,Z), Y*C102A**(H,Z),
Y*C120A**(M,Y), Y*C120A**(H,Z),
YSC072E**(H,Z),YSC092E**(M,Y),
YSC092E**(H,Z), YSC102E**(M,Y),
YSC102E**(H,Z), YSC120E**(M,Y),
YSC120E**(H,Z)
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.
1. Remove the heat section access
panel.
2. Remove TCO1 from shipping
location, attached to the
combustion blower.
3. Replace and discard the existing
TCO1 originally installed at the
factory for downflow operation
with the TCO1 shipped attached
to the combustion blower for
horizontal operation.
4. Replace heat section access
panel.
Figure 20.
Supply duct cover
Insulation side
down
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.
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