Trane Modu manual Electric Heat Installation, Electric Heat Coil Wiring Procedure

Pre-Startup

Installation Requirements

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 inTable 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
20Tons	16
25Tons	20
30Tons	24
32Tons	26
35Tons	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.

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.

!WARNING

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.

!CAUTION

Use only copper conductors for electrical connections to prevent equipment damage.

Figure I-PR-10. Vertical discharge electric heat installation.

Figure I-PR-11. Electric heater dimensions.

Table I-PR-4. Electric Heat Dimensions - English - (inches)

Unit Size	B1	B2	Z
20Tons	10 3/4	15 5/8	27 3/4
25Tons	12 1/4	15 5/8	26 3/4
30, 32, 35Tons	14 3/4	15 5/8	23 3/4

Table I-PR-5. Electric Heat Dimensions - Metric - (mm)

Unit Size	B1	B2	Z
20Tons	273	397	705
25Tons	311	397	679
30, 32, 35Tons	375	397	603

46 SCXG-SVX01B-EN