Tco-A Instructions - Trane TSC037E Installation, Operation And Maintenance Manual

Installation
Note: If unit is equipped with Return Air Smoke Detector,
refer to field conversion instructions for horizontal
discharge before installing return air duct.
Note: If unit is equipped with Discharge Air Sensing
option refer to the following figure for proper tube
positioning based on unit tonnage.
Figure 29. Discharge air sensor
Cap assembly
with insulation
Downflow application
Secure with screw
Cap assembly
with insulation
Horizontal application
Remove and discard this tube
for horizontal conversion
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.
Figure 30. Supply & return openings
Insulation side up
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
28
Supply duct cover
Insulation side
down
Return duct
cover
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 part of
the heater mounting plate and that is located on the
bottom of the two heater element assemblies.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 form 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.
Table 4. TCO-A replaced for horizontal duct
configuration
Unit Model Electric Heater
Number Model Number
TSC120F4, THC092- BAYHTRA418, 427,
102F
BAYHTRAW18A, 36A,
TSC120FW
THC072F4 BAYHTRU427, 436
TSC090F4 BAYHTRW427, 436
TSC090FW BAYHTRWW27, W36
Figure 31. TCO-A location
TCO-A location
Right
436, 454
Right
54A
Center
Center
Center
RT-SVX22M-EN