Installation
32 RT-SVX21AC-EN
TCO1 Instructions for Low NOx Gas
Furnace Option
For units equipped with the low NOx gas furnace option,
the TCO1 is located behind the indoor fan access panel
mounted on the top of the heat exchanger wrapper. See
the below figure for TC01 location.
All the TCO1 tripping values on these units have the same
trippoint for
Downflow and Horizontal con
figurations so
there is no need to make any changes.
Horizontal Discharge Conversion
(3 to 5 Ton Units)
Note: 3 to 5 ton units supply cover to supply opening and
return cover to return opening.
Supplies needed by installer for conversion: 3 oz. tube of
h
igh te
mperature RTV sealant. (500°F / 260°C: similar to
Dow Corning 736)
Important: Failure to use recomm
ended 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 c
overs.
2. Locate supply cover. Apply ¼ in. (6mm.)
continuous
bead of 500°F RTV sealant to the flange as shown.
3. Position duct cover as shown, rotate 90 degrees to
allow entrance into supply opening.
4. Slide duct covers into duct openings until inward edge
of duct cove
r engages with the 2 retaining clips on the
duct flanges. Secure the outward edge of each duct
cover with 2 screws.
Table 8. TC01 tripping values
Unit Model - 3 to 5
Ton
Standard
Efficiency - MCHE
Standard Motor
TCO1 Tripping
Values
Downflow/
Horizontal
Oversized Motor
TCO1 Tripping
Values
Downflow/
Horizontal
YSC036G**(L,X)B 170F 170F
YSC036G**(M,Y)B 170F 170F/155F
YSC036G**(H,Z)B 150F 150F
YSC048G**(L,X)B 170F 155F
YSC048G**(M,Y)B 170F 170F/155F
YSC048G**(H,Z)B 150F 150F
YSC060**(L,X)B 170F 155F
YSC060**(M,Y)B 155F 155F
YSC060**(H,Z)B 150F 150F
Table 9. TCO1 tripping values for units with low Nox
gas furnace option (digit 34 = A)
Unit Model - High Efficiency
TCO1 Tripping Values
Downflow / Horizontal
YHC037***X and Digit 34 = A 190F
YHC047***X and Digit 34 = A 170F
YHC047***Y and Digit 34 = A 190F
YHC067***X and Digit 34 = A 170F
YHC067***Y and Digit 34 = A 190F
Figure 42. TCO1 location for low NOx gas furnace
Figure 43. Duct cover