Installation
RT-SVX23F-EN 25
Note: If unit is equipped with Return Air Smoke Detector,
refer to field conversion instructions for horizontal
discharge before installing return air duct.
Note: Certain unit/electric heater combinations require a
limit switch change out for horizontal airflow
applications. Refer to the following instructions to
determine if this process is required for the unit
undergoing installation.
6. After completing installation of the duct covers for
horizontal discharge, proceed toTCO-A instructions.
TCO-A Instructions
If the unit being installed is listed in the following table and
is equipped with the corresponding model number of
factory installed electric heater package in the table, the
limit controlTCO-A must be replaced with the extra limit
control shipped in the heater compartment. ReplaceTCO-
A following the instructions in steps 1 through 3 below. If
the unit being installed does not have a factory installed
electric heater package or is equipped with a factory
installed electric heater model that does not correspond to
any in this table, skip steps 1 through 3 and go on to next
step in the installation process.
1. Remove the heater section access panel and open the
electric heater dead front panel.
2. TCO-A is the limit control located in the central or right
part of the heater mounting plate and that is located on
the bottom of the two heater element assemblies. See
Figure 29, p. 25.To replace this device, first remove the
two wires connected to the terminals. Next, remove
the two screws which secure it to the heater element
mounting plate. OnceTCO-A has been removed from
the heater element mounting plate, discard this device.
3. Obtain the replacementTCO-A which is secured by a
wire tie near the electric heater terminal block in the
heater compartment. Attach it to the heater element
mounting plate with the two screws that were removed
in step 2 above. Connect the two wires that were un-
hooked in step 2 to the terminals on the newTCO-A.
Refer to the heater package wiring diagram to assure
that the wiring is connected properly.
4. Close the electric heater dead front panel and replace
heat section access panel.
Return Air Smoke Detector
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.
Refer to Downflow View for screw locations.
Table 4. TCO-A replaced for horizontal duct
configuration
Unit Model Number
Electric Heater Model
Number
TCO-A
location
WSC120EW BAYHTRBW36, W54 Right
WSC090E4 BAYHTRU427, 436 Center
WSC090EW BAYHTRUW27, W36 Center
WSC072E3 BAYHTRW327, 336 Center
WSC072E4 BAYHTRW427, 436 Center
WSC072EW BAYHTRWW27, W36 Center
Figure 29. TCO-A location
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