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Installation
Figure 18.
Vent hood installation
Temperature Limit Switch Usage for Gas
Heat Units
Units are factory shipped in the downflow discharge
configuration but can be field converted to a horizontal
discharge configuration. Some, but not all units require a
different TCO1 limit switch, attached to the installed TCO1
limit switch (12.5 to 25 tons) if a horizontal discharge
configuration is used.
If any of the units are installed in the downflow discharge
configuration and have the alternate TCO1 limit switch
provided, remove the additional TCO1 limit switch attached
to the installed TCO1 limit switch (12.5 to 25 tons) and
discard.
For detailed instructions, refer to
24.
Table 3. TCO1 tripping values – two-stage gas
Unit Model
Tons
Number
YZJ150***(0,A)L
YZJ150***(0,A)M
12.5
YZJ150***(0,A)H
YZJ180***(0,A)L
YZJ180***(0,A)M
15
YZJ180***(0,A)H
YZJ210***(0,A)L
YZJ210***(0,A)M
17.5
YZJ210***(0,A)H
YZJ240***(0,A)L
YZJ240***(0,A)M
20
YZJ240***(0,A)H
24
"TCO1 Instructions," p.
TCO1 Tripping Values
(3" Switch)
Downflow/Horizontal
135°F/155°F
140°F/160°F
135°F/150°F
140°F/150°F
130°F/160°F
120°F/155°F
140°F/150°F
130°F/160°F
120°F/155°F
140°F/150°F
125°F/160°F
115°F/155°F
Table 3. TCO1 tripping values – two-stage gas
(continued)
Unit Model
Tons
Number
YZJ300***(0,A)L
YZJ300***(0,A)M
25
YZJ300***(0,A)H
Table 4. TCO1 tripping values – modulating gas
Unit Model
Tons
Number
N/A
12.5
YZJ150***BH
YZJ180***BL
15
YZJ180***BH
YZJ210***BL
17.5
YZJ210***BH
YZJ240***BL
20
YZJ240***BH
YZJ300***BL
25
YZJ300***BH
TCO1 Instructions
Note: For complete Gas Heat User information, Operation,
Start-up, Shutdown and Maintenance refer to
Heat Operation and Maintenance," p.
If the unit that being installed in horizontal configuration has
a different TCO1 value than downflow configuration, then
the limit control TCO1 must be replaced with the extra limit
control shipped with the unit in the heater compartment.
Refer . Replace TCO1 following the instructions in steps 1
through 3 below. If the unit being installed does not need to
replace TCO1 limit switch, skip steps 1 through 3 and
proceed to the next step in the installation process.
1. Remove the heat section access panel.
2. Remove TCO1 from shipping location, which is
attached to the installed TCO1 limit switch (12.5 to 25
tons).
3. Replace and discard the existing TCO1 originally
installed at the factory for downflow operation with the
TCO1 shipped with the unit which is attached to the
installed TCO1 limit switch (12.5 to 25 tons) for
horizontal operation.
4. Replace heat section access panel.
TCO1 Tripping Values
(3" Switch)
Downflow/Horizontal
140°F/150°F
125°F/160°F
115°F/155°F
TCO1 Tripping Values
(3" Switch)
Downflow/Horizontal
N/A
125°F - 3" stilt
125°F - 3" stilt
140°F button
125°F - 3" stilt
140°F button
125°F - 3" stilt
140°F button
125°F - 3" stilt
140°F button
"Gas
53.
RT-SVX077B-EN
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