Bryant 558F Make Electrical Connections, Field Power Supply, Field Control Wiring

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/NFPA (American National Standards Institute/National Fire Protection Association), latest edition, 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 nameplate. If the 208/230-v unit is to be connected to a 208-v power supply, the transformer must be rewired by moving the black wire from the 230-v 1/4-in. male spade terminal on the transformer and connecting it to the 200-v 1/4-in. male spade terminal on the transformer.

Refer to unit label diagram for additional information. Pig- tails are provided for field wire connections.

When installing units, provide a disconnect per NEC. Use copper conductors only when splice connectors are used.

NOTE: When accessory thru-the-bottom connections are used, refer to the accessory installation instructions for information on power wiring. Refer to Fig. 7A and 7B for drilling locations.

All field wiring must comply with NEC and local require- ments. In Canada, electrical connections must be in accor- dance with CSA (Canadian Standards Association) C22.1 Canadian Electrical Code Part One.

Install field wiring as follows (see Fig. 8-10):

1.Install conduit through side panel openings between disconnect and single point box (see Fig. 9 and 10).

2.Install power wires to terminal connections as shown in Fig. 8.

Voltage to compressor terminals during operation must be within voltage range indicated on unit nameplate (see Tables 2A-2D). On 3-phase units, voltages between phases must be balanced within 2% and the current within 10%. Use the formula shown in the legend for Tables 2A and 2B, Note 2 to determine the percentage of voltage imbalance. Operation on improper line voltage or excessive phase imbal- ance constitutes abuse and may cause damage to electrical components. (Such operation would invalidate any applica- ble Bryant warranty.)

B. Field Control Wiring

Install a Bryant-approved accessory thermostat assembly according to installation instructions included with the accessory. Locate thermostat assembly on a solid wall in the conditioned space to sense average temperature in accor- dance with thermostat installation instructions.

Route thermostat cable or equivalent single leads of colored wire from subbase terminals to low-voltage connections on unit (shown in Fig. 11) as described in Steps 1-5 below.

NOTE: For wire runs up to 50 ft, use no. 18 AWG (American Wire Gage) insulated wire (35 C minimum). For 50 to 75 ft, use no. 16 AWG insulated wire (35 C minimum). For over 75 ft, use no. 14 AWG insulated wire (35 C minimum). All wire larger than no. 18 AWG cannot be directly connected to the thermostat and will require a junction box and splice at the thermostat.

1.If unit is mounted on roof curb and accessory thru- the-bottom connection is used, route wire through connector provided in accessory kit through the unit basepan.

2.Pass control wires through the hole provided on unit (see connection D, Connection Sizes Table, Fig. 7A and 7B).

3.Feed wire through the raceway built into the corner post to the 24-v barrier located on the left side of the control box. See Fig. 12. The raceway provides the UL-required (Underwriters’ Laboratories) clearance between the high-and low-voltage wiring.

4.Connect thermostat wires to screw terminals of low- voltage terminal board.

5.If unit is to be equipped with electric resistance heat, ensure thermostat on a call for heat “W” energizes “G” output. This allows fan operation on a call for heat.

575-3-60

208/230-3-60

(090-121),

460-3-60

208/230-3-60

(150,151)

		LEGEND
C	— Contactor		Terminal Block
COMP(S)	—	Compressor(s)	Connection
IFC	—	Indoor (Evaporator)	Splice Connection
		Fan Contactor
NEC	— National Electrical Code		Field Wiring
TB	— Terminal Block		Factory Wiring

Fig. 8 — Power Wiring Connections

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