Electrical; Aluminum Wire - Bryant R-22 Application Manual And Service Manual

ELECTRICAL

WARNING: Exercise extreme caution when working on
any electrical components. Shut off all power to system
prior to troubleshooting. Some troubleshooting tech-
niques require power to remain on. In these instances,
exercise extreme caution to avoid danger of electrical
shock. ONLY TRAINED SERVICE PERSONNEL
SHOULD PERFORM
SHOOTING.
Troubleshooting charts for air conditioning and heat pump units
are provided in the back of this manual. They enable the service
technician to use a systematic approach to locate the cause of a
problem and correct system malfunctions.
Fig. 8—Basic Cabinet Designs
ELECTRICAL TROUBLE-
I. ALUMINUM WIRE
CAUTION: Aluminum wire may be used in the branch
circuit (such as the circuit between the main and unit
disconnect), but only copper wire may be used between
the unit disconnect and the unit on Bryant systems.
Whenever aluminum wire is used in the branch-circuit wiring with
this unit, adhere to the following recommendations.
Connections must be made in accordance with the National
Electrical Code (NEC), using connectors approved for aluminum
wire. The connectors must be UL-approved (marked Al/Cu with
the UL symbol) for the application and wire size. The wire size
selected must have a current capacity not less than that of the
copper wire specified and must not create a voltage drop between
the service panel and the unit in excess of 2 percent of the
unit-rated voltage.
To prepare the wire before installing the connector, all aluminum
wire must be brush scratched and coated with a corrosion
inhibiter such as Pentrox A. When it is suspected that the
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