Bryant 580F VII. Make Electrical Connections, Field Power Supply, Field Control Wiring

VII. STEP 7 — MAKE ELECTRICAL CONNECTIONS

WARNING: Unit cabinet must have an uninter- rupted, unbroken electrical ground to minimize the possi- bility 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 accor- dance with NEC (National Electrical Code), ANSI/NFPA, latest edition, and local electrical codes. Do not use gas piping as an electrical ground. Failure to follow this warning could result in the installer being liable for per- sonal 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 with the 1/4-in. female space connector from the 230-volt connection and moving to the 208-volt 1/4-in. male terminal on the primary side of the transformer.

Refer to unit label diagram for additional information. Pigtails 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 NEC and local require- ments.

Install field wiring as follows:

1.Install conduit through side panel openings. Install conduit between disconnect and control box.

2.Install power lines to terminal connections as shown in Fig. 9.

Voltage to compressor terminals during operation must be within voltage range indicated on unit nameplate (see Tables 2A and 2B). 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 percent 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 applicable 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. Connect thermostat wires to terminal board.

Route thermostat cable or equivalent single leads of colored wire from subbase terminals through connector on unit to low-voltage connections (shown in Fig. 10).

NOTE: For wire runs up 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

BLOWER

ACCESS

PANEL

Fig. 7 — Flue Hood Details

LEGEND

NFGC — National Fuel Gas Code *Field supplied.

NOTE: Follow all local codes.

SPACING OF SUPPORTS

STEEL PIPE	X
NOMINAL DIAMETER	DIMENSION
(in.)	(feet)
1/	6
2
3/ or 1	8
4
11/ or larger	10
4

Fig. 8 — Gas Piping Guide (With Accessory

Thru-the-Curb Service Connections)

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.

Pass the control wires through the hole provided in the cor- ner post; then feed wires through the raceway built into the corner post to the 24-v barrier located on the left side of the control box. See Fig. 11. The raceway provides the UL required clearance between high-voltage and low-voltage wiring.

C. Heat Anticipator Settings

Set heat anticipator settings at .14 amp for the first stage and .14 amp for second-stage heating, when available.

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