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Figure 18. Vent hood shipping location
3.
Install the vent hood on the gas heat panel using the
screws removed in Step 1. Make sure it is properly
secured to the panel.
Figure 19.
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, which is attached to the
installed TCO1 limit switch (12.5 to 25 tons) if horizontal
discharge configuration is used.
PKGP-SVX010B-EN
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 which is
attached to the installed TCO1 limit switch (12.5 to 25 tons)
and discard.
For detailed instructions, refer to
23.
Table 4. TCO1 tripping values
Unit Model
Tons
Number
DSJ150A**(0,A)L
DSJ150A**(0,A)M
12.5
DSJ150A**(0,A)H
DSJ180A**(0,A)L
DSJ180A**(0,A)M
15
DSJ180A**(0,A)H
DSJ240A**(0,A)L
DSJ240A**(0,A)M
20
DSJ240A**(0,A)H
DSJ300A**(0,A)L
DSJ300A**(0,A)M
25
DSJ300A**(0,A)H
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 go on
to 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.
Installation
"TCO1 Instructions," p.
TCO1 Tripping Values -
Downflow/Horizontal
135°F-3"/155°F-3"
140°F-3"/160°F-3"
160°F-3"/170°F-3"
140°F-3"/150°-7"
150°F-3"/195°F-3"
150°F-3"/200°F-3"
140°F-3"/150°F-3"
125°F-3"/160°F-3"
115°F-3"/155°F-3"
140°F-3"/150°F-3"
125°F-3"/160°F-3"
115°F-3"/155°F-3"
"Gas
51.
23
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