Bryant 583B Supplyand Return Duct Opening, B. Special Procedures For 208-VOperation

SUPPLY	RETURN
DUCT	DUCT
OPENING	OPENING

C99089

Fig. 11—Supply and Return Duct Opening

The field-supplied disconnect switch box may be mounted on the unit over the high-voltage inlet hole when the standard power and low-voltage entry points are used. See Fig. 6 and 7 for acceptable location.

See unit wiring label and Fig. 14 for reference when making high voltage connections. Proceed as follows to complete the high- voltage connections to the unit.

1.Run the high-voltage (L1, L2, L3) and ground leads into the control box.

2.Connect ground lead to chassis ground connection.

3.Locate the black and yellow wires connected to the lines side of the contactor.

4.Connect field L1 to black wire on connection 11 of the compressor contactor.

5.Connect field wire L2 to yellow wire on connection 13 of the compressor contactor.

6.Connect field wire L3 to Blue wire from compressor.

B. Special Procedures For 208-V Operation

DUCT COVERS REMOVED

C99012

Fig. 12—Vertical Duct Cover Removed

CAUTION: Failure to follow these precautions could result in damage to the unit being installed:

1.Make all electrical connections in accordance with NEC ANSI/NFPA 70 (latest edition) and local electri- cal codes governing such wiring. In Canada, all elec- trical connections must be in accordance with CSA standard C22.1 Canadian Electrical Code Part 1 and applicable local codes. Refer to unit wiring diagram.

2.Use only copper conductor for connections between field-supplied electrical disconnect switch and unit. DO NOT USE ALUMINUM WIRE.

3.Be sure that high-voltage power to unit is within operating voltage range indicated on unit rating plate.

4.Do not damage internal components when drilling through any panel to mount electrical hardware, con- duit, etc.

5.On 3-phase units, ensure phases are balanced within 2%. Consult local power company for correction of improper voltage and/or phase imbalance (refer to Table 5).

A.HIGH-VOLTAGE CONNECTIONS

The unit must have a separate electrical service with a field- supplied, water-proof, disconnect switch mounted at, or within sight from the unit. Refer to the unit rating plate for maximum fuse/ circuit breaker size and minimum circuit amps (ampacity) for wire sizing. See Table 5 for electrical data.

—11—

WARNING: Make sure that the gas supply then the power supply to the unit is switched OFF before making any wiring changes. Electrical shock or explosion could cause serious injury or death.

With disconnect switch open, move yellow wire from transformer (3/16 in.) terminal marked 230 to terminal marked 200. This retaps transformer to primary voltage of 208 vac.

C. CONTROL VOLTAGE CONNECTIONS

NOTE: Do not use any type of power-stealing thermostat. Unit control problems may result.

Use no. 18 American Wire Gage (AWG) color-coded, insulated (35° C minimum) wires to make the control voltage connections between the thermostat and the unit. If the thermostat is located more than 100 ft from the unit (as measured along the control voltage wires), use no. 16 AWG color-coded, insulated (35° C minimum) wires.

STANDARD CONNECTION — Remove knockout hole located in the flue panel adjacent to the control access panel. See Fig. 6 and 7. Remove the rubber grommet from the installer’s packet (included with unit) and install grommet in the knockout opening. Provide a drip loop before running wire through panel.

Run the low-voltage leads from the thermostat, through the inlet hole, and into unit low-voltage splice box.

Locate five 18-gauge wires leaving control box. These low-voltage connection leads can be identified by the colors red, green, yellow, brown, and white. (See Fig. 14.) Ensure the leads are long enough to be routed into the low-voltage splice box (located below right side of control box). Stripped yellow wire is located in connection box. Route leads through hole in bottom of control box and make low-voltage connections as shown in Fig. 14. Secure all cut wires, so that they do not interfere with operation of unit.

HEAT ANTICIPATOR SETTING — The room thermostat heat anticipator must be properly adjusted to ensure proper heating performance. Set the heat anticipator, using an ammeter between the W and R terminals to determine the exact required setting.

NOTE: For thermostat selection purposes, use 0.18 amp for the approximate required setting.

Failure to make a proper heat anticipator adjustment will result in improper operation, discomfort to the occupants of the conditioned space, and inefficient energy utilization; however, the required setting may be changed slightly to provide a greater degree of comfort for a particular installation.