Bryant 548D V. - Make Electrical Connections, A. Field Power Supply, Power Wiring Connections

V. STEP 5 — MAKE ELECTRICAL CONNECTIONS

WARNING: Unit cabinet must have an uninter- rupted, unbroken electrical ground to minimize the possibility of personal injury if an electrical fault should occur. This ground may consist of electrical wire connected to unit ground lug in control compartment, or conduit approved for electrical ground when installed in accordance with NEC (National Electrical Code) ANSI (American National Standards Institute) / NFPA (National Fire Protection Association) 70 latest year and local electrical codes. Failure to follow this warning could result in the installer being liable for personal injury of others.

A. Field Power Supply

All units except 208/230-v units are factory-wired for the voltage shown on the unit nameplate. If the 208/230-v unit is to be connected to a 208-v power supply, the transformer must be rewired by disconnecting the black wire from the 230-v terminal on the transformer and connecting it to the 200-v terminal from the transformer.

Refer to unit label diagram for additional information. Pig- tails are provided for field wire connections. Use factory- supplied splices or UL (Underwriters’ Laboratories) approved copper/aluminum connector.

When installing units, provide a disconnect per the NEC.

All field wiring must comply with the NEC and local re- quirements. In Canada, electrical connections must be made in accordance with CSA (Canadian Standards Association) C22.1 Canadian Electrical Code Part One.

Install field wiring as follows:

1.Install conduit through side panel openings. For units without electric heat, install conduit between discon- nect and control box.

2.Install power lines to terminal connections as shown in Fig. 7.

3.For units with electric heat, refer to Accessory Instal- lation Instructions.

4.If thru-the-bottom control connections are used, refer to the accessory installation instructions for informa- tion on control wiring. Refer to Fig. 6 for drilling holes in basepan.

During operation, voltage to compressor terminals must be within range indicated on unit nameplate (see Tables 2A and 2B). On 3-phase units, voltages between phases must be bal- anced within 2%, and the current within 10%. Use the for- mula shown in Tables 2A and 2B, Note 2 on page 10 to determine the percentage of voltage imbalance. Operation on improper line voltage or excessive phase imbalance consti- tutes abuse and may cause damage to electrical compo- nents. Such operation would invalidate any applicable warranty.

208/230-3-60		LEGEND	575-3-60
460-3-60
	C	— Contactor
	COMP — Compressor
	IFC	— Indoor Fan Contactor
	NEC	— National Electrical Code
	TB	— Terminal Block
		Field Wiring

Factory Wiring Splice Connection (Factory-Supplied)

Fig. 7 — Power Wiring Connections

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