Installation
RT-SVX46C-EN
21
2. Apply ¼ in. (6mm.) continuous bead of 500°F RTV
sealant to the flange of the duct cover to be installed in
the supply opening of the base pan.
Note:
Perform the same task for the 3 ton duct cover to be
installed in the return opening.
3. For the 3 ton unit, slide duct cover with insulation side
up into duct openings until inward edge of duct cover
engages with the 2 retaining clips on the duct flanges.
Secure the outward edge of each duct cover with 2
screws.
4. For the 4 and 5 ton units, 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. Place the supply duct cover
over the return opening (insulation side down). Secure
the cover with 4 screws using the dimples on the top
surface to initiate screw engagement.
5. After completing installation of the duct covers for
horizontal discharge, proceed to TCO-1 instructions.
TCO-1 Instructions
If the unit being installed is listed in the following list, the
limit control TCO1 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 steps 1 through 3 and go on to next step
in the installation process.
Unit Model Number
YZC048F** (L,X), YZC036E** (M,Y) direct drive ID motor.
1.
Remove the heat section access panel.
2. RemoveTCO1 from shipping location, attached to the
combustion blower.
3. Replace and discard the existing TCO1 originally
installed at the factory for down flow operation with
the TCO1 shipped attached to the combustion blower
for horizontal operation.
4. Replace heat section access panel.
Return Air Smoke Detector
Note:
Consult smoke detector manufacturer if daisy
chaining is required.
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.
Note:
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°
ensuring that the holes on the copper sensing tube
face away from the unit and face the return air
ductwork.
Figure 15.
Duct cover
Figure 16. TCO1 location (YZC036E)
RTV Sealant
Location of TC01 Limit
for the YZC036E
Flame
Rollout
Limit
Location of TC01 Limit
for the YZC048F and YZC060E
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.
Figure 17.
Downflow view
Remove
3 Screws
Downflow View
