Lennox International Inc Merit CBX25UH Series Electrical Connections, Volt Conversion

Electrical Connections

WARNING

Electric shock hazard! - Disconnect all power supplies before servicing.

Replace all parts and panels before op­ erating.

Failure to do so can result in death or elec­ trical shock.

WARNING

Electric Shock Hazard.

Can cause injury or death.

Foil‐faced insulation has conductive characteristics sim­ ilar to metal. Be sure there are no electrical connections within a ½” of the insulation. If the foil‐faced insulation comes in contact with electrical voltage, the foil could provide a path for current to pass through to the outer metal cabinet. While the current produced may not be enough to trip existing electrical safety devices (e.g. fuses or circuit breakers), the current can be enough to cause an electric shock hazard that could cause person­ al injury or death.

SAll field wiring must be done in accordance with National Electrical Code, applicable requirements of UL and local codes, where applicable.

SElectrical wiring, disconnect means and over-current protection are to be supplied by the installer. Refer to the air handler rating plate for maximum over-current protection, minimum circuit ampacity, as well as operating voltage.

SThe power supply must be sized and protected according to the specifications supplied on the product.

SThis air handler is factory-configured for 240 volt, single phase, 60 cycles. For 208-volt applications, see “208 Volt Conversion” later in this section.

SFor optional field‐installed electric heat applications, refer to the instructions provided with the accessory for proper installation.

WARNING

USE COPPER CONDUCTORS ONLY

1.Disconnect all power supplies.

2.Remove the air handler access panel.

3.Route the field supply wires to the air handler electrical connection box.

4.Use UL-listed wire nuts to connect the field supply conductors to the unit black and yellow leads, and the ground wire to ground terminal marked GND.

5.Replace the air handler access panel.

CONNECT BLACK AND

YELLOW WIRES TO

FIELD-PROVIDED

CONDUCTORS.

CONNECT GROUND

WIRE TO GROUND

TERMINAL MARKED

“GND”

Figure 11. Making Electrical Connections

208 VOLT CONVERSION

1.Disconnect all power supplies.

2.Remove the air handler access panel.

3.Using the wiring diagram located on the unit access panel as a reference, move the 2 connected black transformer leads from the 240 volt terminal on the transformer to the 208 volt terminal on the transformer.

WARNING

Electrically ground air handler. Connect ground wire to ground terminal marked “GND”.

Failure to do so can result in death or elec­ trical shock.

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CBX25UH SERIES