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46 SCXG-SVX01B-EN
Disconnect electrical power
source before wiring electric heat
to unit to prevent risk of injury or
death from electrical shock.
2. Punch out the appropriate knockouts in
the electric heater control box and on
the unit’s left side panel. Run the wires
down the side of the unit from the
heater to the lower unit control box.
Place the wire in conduit in accordance
with local code.
Use only copper conductors for
electrical connections to prevent
equipment damage.
Pre-Startup
Requirements
Installation
Electric Heat Installation
The electric heat option consists of a
single stage heater and is used in
IntelliPak units or units with a field-
installed thermostat. The electric heater
ships separate for field installation and
wiring. Available heater kW per unit size
is listed in Table I-PR-3. Electric heat can
be installed on units with either a vertical
or horizontal discharge. However, it
cannot be installed on units with plenums.
See Figure I-PR-10, Tables I-PR-4, and
I-PR-5 for electric heat dimensional data.
Table I-PR-3. Available Electric Heat kW
Unit Size Heater kW
20 Tons 16
25 Tons 20
30 Tons 24
32 Tons 26
35 Tons 28
Installation Procedure
1. Remove the fan discharge shipping
covers, if they have not already been
removed.
2. Install the open-cell gasket around the
discharge opening on the heater.
3. Position the electric heater so that the
unit fan discharge openings line up with
the electric heater openings. For a
vertical discharge unit, position the
electric heater as shown in Figure I-PR-
10.
Figure I-PR-11. Electric heater dimensions.
Table I-PR-4. Electric Heat Dimensions - English - (inches)
Unit Size B1 B2 Z
20 Tons 10
3
/
4
15
5
/
8
27
3
/
4
25 Tons 12
1
/
4
15
5
/
8
26
3
/
4
30, 32, 35 Tons 14
3
/
4
15
5
/
8
23
3
/
4
Table I-PR-5. Electric Heat Dimensions - Metric - (mm)
Unit Size B1 B2 Z
20 Tons 273 397 705
25 Tons 311 397 679
30, 32, 35 Tons 375 397 603
Figure I-PR-10. Vertical discharge electric
heat installation.
4. Use the hole pattern in the electric heat
as a template for marking and drilling
3
/
16
” diameter holes in the unit.
5. Bolt the electric heaters to the unit
using
1
/
4
” sheetmetal screws.
Note: It is very important that electric
heaters are selected based on unit voltage
and tonnage because discharge opening
sizes vary by unit tonnage.
Electric Heat Coil Wiring Procedure
1. Before wiring the electric heater,
remove the unit wiring diagram from
the unit control panel and refer to the
connection points.
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WARNING
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CAUTION
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