Installation
RT-SVX46G-EN 27
• If applicable, assemble and install the roof curb. Refer
to the latest edition of the curb installers guide that
ships with each curb kit.
• Fabricate and install ductwork;
se
cure ductwork to
curb.
• If applicable, install pitch pocket for power supply
through bu
ilding roof.
• Rigging the unit.
• Set the unit onto the c
urb; check for levelness.
• Ensure unit-to-curb seal is tight and without buckles
or
cracks.
• Install and connect a condensate drain line to the
evaporato
r drain connection.
Note: Condensate Overflow
Switch (if equipped)
will not
work if unit is not leveled properly.
Factory Installed Economizer
• Ensure the economizer has been pulled out into the
operating position. Refer to the economizer installers
guide for proper position and setup.
• Install all access panels.
Temperature Limit Switch Usage for Gas
Heat Units
Units are factory shipped in the down flow discharge
configuration but can be field converted to a horizontal
discharge configuration. Some, but not all units require a
different TCO1 limit switch, which is attached to the
combustion blower motor if horizontal discharge
configuration is used.
If any of the aforementioned units are installed in the down
fl
ow di
scharge configuration, remove the additional TCO1
limit switch from the combustion blower motor and
discard.
Horizontal Discharge Conversion
(3 to 5 Ton Units)
Note: 3 ton unit supply cover to supply opening and
return cover to return opening. 4 and 5 ton unit
return cover to supply opening and supply cover to
return opening.
Supplies needed by installer for conversion: 3 oz. tube of
h
ig
h temperature RTV sealant. (500°F / 260°C: similar to
Dow Corning 736)
Important: Failu
re to use recommended sealant could
result in unit performance loss.
If a unit is to be converted to a horizontal discharge, the
fol
lowin
g conversion must be performed:
1. Remove RETURN and SUPPLY duct
covers.
2. Apply 1/4 in. (6 mm.) continuous bead of 500°F RTV
sealant to the flange of th
e duct cover to be installed in
the supply opening of the base pan.
Note: Perform
the sa
me task for the 3 ton duct cover to be
installed in the return opening.
3. For the 3 ton unit, slide duct cover wi
th insulation side
up into duct openings until inward edge of duct cover
engages with the 2 retaining clips on the duct flanges.
Table 3. TCO1 tripping values
Unit Model
TCO1 Tripping Values -
Downflow/ Horizontal TCO Location
YZC036E**(L,X) 190°F Top
YZC036E**(M,Y) 170°F/220°F Top
YZC036E**(H,Z) 220°F Top
YZC048F**(L,X) 145°F/155°F Bottom
YZC048F**(M,Y) 170°F Bottom
YZC048F**(H,Z) 220°F Bottom
YZC060E**(L,X) 140°F Bottom
YZC060E**(M,Y) 170°F Bottom
YZC060E**(H,Z) 170°F Bottom
YZC072F**(L,X) 180°F/200°F Bottom
YZC072F**(M,Y) 180°F/230°F Bottom
YZC072F**(H,Z,V) 180°F/230°F Bottom
YZC090F**(L,X) 200°F/220°F Bottom
YZC090F**(M.Y) 190°F/225°F Bottom
YZC090F**(H,Z,V) 200°F/210°F Bottom
YZC102F**(L,X) 200°F/220°F Bottom
YZC102F**(M,Y) 190°F/225°F Bottom
YZC102F**(H,Z,V) 200°F/210°F Bottom
YZC120F**(L,X) 170°F/200°F Bottom
YZC120F**(M,Y) 170°F/190°F Bottom
YZC120F**(H,Z,V) 135°F/155°F Top
Table 4. TCO1 tripping values for units with low NOx
gas furnace option (digit 34 = A)
Unit Model - High Efficiency
TCO1 Tripping Values
Downflow / Horizontal
YHC036***X and Digit 34 = A 190°F
YHC048***X and Digit 34 = A 170°F
YHC048***Y and Digit 34 = A 190°F
YHC060***X and Digit 34 = A 170°F
YHC060***Y and Digit 34 = A 190°F
Figure 46. Duct cover
Table 3. TCO1 tripping values (continued)
Unit Model
TCO1 Tripping Values -
Downflow/ Horizontal TCO Location
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