ELECTRICAL
Exercise extreme caution when working on any electrical
components. Shut off all power to system prior to trouble-
shooting. Some troubleshooting techniques require power to
remain on. In these instances, exercise extreme caution to
avoid danger of electrical shock. ONLY TRAINED SER-
VICE PERSONNEL SHOULD PERFORM ELECTRICAL
TROUBLESHOOTING.
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 locating the cause of a
problem and correcting system malfunctions.
Step 1—Aluminum Wire
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 Carrier 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
Fig. 8—Basic Cabinet Designs
A00009
Fig. 9—Information Plate
A88411
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