26 RT-SVX23D-EN
Installation
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. Once TCO-A has been removed form the heater
element mounting plate, discard this device.
3. Obtain the replacement TCO-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 8 above. Connect the two wires that were un-hooked in step
8 to the terminals on the new TCO-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 3.
Unit Model Number Electric Heater Model Number
WSC072A4, 090A4 BAYHTRS427A, 436A
WSC072AW, 090AW BAYHTRSW27, W36
WSC120A4 BAYHTRT454A
WSC120AW BAYHTRTW54A
Figure 19. Downflow View
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