Bryant 581B VII. Make Electrical Connections, Field Power Supply, Field Control Wiring

Fig. 8 — Flue Hood Details

LEGEND

NFGC — National Fuel Gas Code *Field supplied.

NOTE: Follow all local codes.

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

Fig. 9 — Gas Piping Guide (With Accessory

Thru-the-Curb Service Connections)

VII. STEP 7 — 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 (National Fire Protection Associa- tion), 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 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 terminal on the transformer and connecting it to the 200-v terminal on the transformer.

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

When installing units, provide a disconnect per NEC.

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 conduit through side panel openings indicated in Fig. 7. Route power lines through connector to terminal connections as shown in Fig. 10.

On 3-phase units, voltages between phases must be balanced within 2% and the current within 10%. Use the formula shown in Note 3 under Tables 2A-2D to determine the per- centage of voltage imbalance. Operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation would invalidate any applicable Bryant warranty.

NOTE: If thru-the-bottom accessory connections are used, refer to the thru-the-bottom accessory installation instruc- tions for power wiring. Refer to Fig. 7 for location to drill holes in basepan.

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 thermostat subbase terminals to low-voltage con- nections on unit (shown in Fig. 11) as described in Steps 1-4 below.

1.If mounted on a roof curb and electrical power is to be run through the basepan, an accessory thru-the-bot- tom connection kit is required. This is available through the local Bryant distributor. This kit is required to ensure a reliable water-tight connection.

2.If unit is mounted on roof curb and accessory thru- the-bottom connections are used, route wire through connection plate.

3.Pass control wires through the hole provided on unit (see connection D, Connection Sizes table, Fig. 7).

4.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. 12. The raceway provides the UL-required clearance between high- and low-voltage wiring.

5.Connect thermostat wires to screw terminals of low- voltage connection board (see Fig. 11).

NOTE: For wire runs up to 50 ft, use no. 18 AWG (American Wire Gage) insulated wire (35 C minimum). For 51 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).

NOTE: 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.

C. Heat Anticipator Settings

Set heat anticipator settings at 0.14 amp for first stage and 0.14 amp for second-stage heating, when available.

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