Bryant 764A installation instructions Ð Typical Installation, D. Electrical Connections

LEGEND
NEC Ð National Electrical Code	Outdoor Air¯ow
Power Wiring	Indoor Air¯ow
Control Wiring

*Required for electric heater when single-point connection is not used.

Fig. 12 Ð Typical Installation

C. Converting Horizontal Discharge Units to Down¯ow (Vertical) Discharge

WARNING: Before performing service or mainte- nance operations on system, turn off main power to unit. Turn off accessory heater power switch if applicable. Elec- trical shock can cause personal injury.

Units are dedicated side-supply products. Units are not con- vertible to vertical air supply. A ®eld-supplied plenum must be used to convert to vertical air discharge.

D. Electrical Connections

WARNING: The unit cabinet must have an un- interrupted, unbroken electrical ground to minimize the possibility of personal injury if an electrical fault should occur. This ground may consist of an electrical wire con- nected to the unit ground in the control compartment, or conduit approved for electrical ground when installed in accordance with NEC, ANSI (American National Standards Institute)/NFPA (latest edition) (in Canada, Canadian Electrical Code CSA [Canadian Standards Association] C22.1) and local electrical codes. Failure to adhere to this warning could result in per- sonal injury or death.

CAUTION: Failure to follow these precautions could result in damage to the unit being installed:

1.Make all electrical connections in accordance with NEC ANSI/NFPA (latest edition) and local electrical codes governing such wiring. In Canada, all elec- trical connections must be in accordance with CSA Standard C22.1 Canadian Electrical Code Part 1 and applicable local codes. Refer to unit wiring diagram.

2.Use only copper conductor for connections between ®eld-supplied electrical disconnect switch and unit.

DO NOT USE ALUMINUM WIRE.

3.Be sure that high-voltage power to unit is within op- erating voltage range indicated on unit rating plate. On 3-phase units, ensure that phases are balanced within 2%. Consult local power company for correc- tion of improper voltage and/or phase imbalance.

4.Insulate low-voltage wires for highest voltage con- tained within conduit when low-voltage control wires are run in same conduit as high-voltage wires.

5.Do not damage internal components when drilling through any panel to mount electrical hardware, con- duit, etc.

High-Voltage Connections

The unit must have a separate electrical service with a ®eld- supplied, waterproof disconnect switch mounted at, or within sight from the unit. Refer to the unit rating plate for maxi- mum fuse/circuit breaker size and minimum circuit amps (ampacity) for wire sizing. See Table 2 for electrical data.

The ®eld-supplied disconnect may be mounted on the unit over the high-voltage inlet hole. See Fig. 2-4.

CAUTION: Operation of unit on improper line volt- age constitutes abuse and may cause unit damage that could affect warranty.

Routing Power Leads Into Unit

Use only copper wire between disconnect and unit. The high- voltage leads should be in a conduit until they enter the unit; conduit termination at the unit must be watertight. Run the high-voltage leads through the hole on the side of the unit (see Fig. 13 for location). When the leads are inside the unit, run leads to the control box (Fig. 14). For single-phase units, connect leads to the black and yellow wires; for 3-phase units, connect the leads to the black, yellow, and blue wires (see Fig. 15).

Connecting Ground Lead to Unit Ground

Refer to Fig. 14 and 15. Connect the ground lead to the chas- sis using the unit ground screw in the control box.

Routing Control Power Wires

Form a drip-loop with the thermostat leads before routing them into the unit. Route the thermostat leads through grommeted hole provided in unit (see Fig. 13) into unit con- trol box. Connect thermostat leads to unit control power leads as shown in Fig. 16.

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