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Fig. 44 - Typical Conduit Installation
9. Connect power tap conductors to the unit's main
control box.
Single point boxes with two or three tap conductors
Route the tap conductors (with bushings added per
step 8) into the unit's main control box. Connect the
power tap conductors to the designated terminals in
the unit's control box for field power connections.
Refer to the wiring diagram.
1. Route the first set of tap conductors (attached at upper
fuse block with bushing per step 8) into the main
control box.
2. Route the second set of tap conductors (attached at
second fuse block) into the main control box.
3. Connect both sets of tap conductors to unit terminal
block TB1.
Installing Electric Heater
1. Identify heater cover to remove. See Fig. 45.
Fig. 45 - Typical Electric Heat Installation
2. Open heater package(s) and remove heater module,
screws, wiring label, and miscellaneous parts.
3. Install the heater module in the heater support bracket
opening(s). Fasten heater module to heater mounting
bracket with the 4 screws saved from step 1.
4. Single- phase heater conversion 208/230V heaters
323A00- 327A00, 329A00- 331A00 are factory- wired
for 3- phase applications, but can be converted to
single- phase by changing one wire as described
below.
For three- phase applications, skip to Step 5.
For single- phase applications, rewire the heater as
follows. See Fig. 46:
a. Connect the RED wire provided with kit to Heater
Relay (HR) and to L1 as shown.
b. Disconnect the YELLOW wire from HR Terminal
2 and reconnect to HR Terminal 3.
c. Using the wire tie provided, fasten the RED wire
to heater power wire harness near existing wire tie on
heater module. This provides strain relief for the
RED wire. See Fig. 46.
Connect BLACK and RED conductors in heater power
wire harness to the same L1 pole on single point box TB
or fuse block. Connect BLUE and YELLOW conductors
in the heater power wire harness to the same L2 pole on
single point box TB or fuse block. See Fig. 46.
5. Route power wires from heater module(s) through
foam bushing in the center partition and into the
single point box. Connect to terminal block or fuse
blocks.
All heaters are single bank heaters except
CRHEATER327A00, 329A00- 332A00, and
337A00- 338A00, which are dual bank heaters.
These heaters will be wired as two heaters (i.e. 6
leads). Fusing is shown pictorially on the unit's
wiring schematic label.
If no single point box is required for the unit and
heater combination, run the heater power supply
wiring through the grommet holes to the main unit
control box's field power connection points.
6. Factory control wiring for heaters runs from unit
control box to terminal block TB- 4, mounted in
heater compartment to left of the heater module.
Connect the heater control wiring at TB- 4.
Fig. 46 - Single Phase Heater Wiring
34
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