Carrier 50TFQ008-012 specifications Make Electrical Connections, Power Wiring Connections

Step 5 — Make Electrical Connections

Unit cabinet must have an uninterrupted, unbroken electri- cal 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 com- partment, 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.

FIELD POWER SUPPLY — All units except 208/230-v units are factory-wired for the voltage shown on the unit name- plate. 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 1/4-in. male spade terminal on the transformer and connecting it to the 208-v 1/4-in. male spade terminal from the transformer.

Refer to the unit label diagram for additional information. Pigtails are provided for field wire connections. Use factory- supplied splices or a 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 the side panel openings. For units without electric heat, install conduit between the 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 Table 2 and Accessory Installation Instructions.

During operation, voltage to compressor terminals must be within range indicated on unit nameplate (see Tables 3A and 3B). On 3-phase units, voltages between phases must be bal- anced within 2%, and the current within 10%. Use the formula shown in Tables 3A and 3B, Note 2 on page 11 to determine the percentage of voltage imbalance. Operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such opera- tion would invalidate any applicable Carrier warranty.

208/230-3-60575-3-60 460-3-60

LEGEND

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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