Bryant LEGACY 213R Service Manual download pdf (Page 11)

ELECTRICAL

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.

Exercise extreme caution when working on any electrical

components. Shut off all power to system prior to

troubleshooting. Some troubleshooting techniques require

power to remain on. In these instances, exercise extreme

caution to avoid danger of electrical shock. ONLY

TRAINED S ERVICE PERSONNEL SHOULD

PERFORM ELECTRICAL TROUBLESHOOTING.

WARNING

Aluminum Wire

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

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.

CAUTION

Whenever aluminum wire is used in 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 c urrent capacity not less than that of the

copper wire specified, and must not create a voltage drop between

service panel and unit in excess of 2 of unit rated voltage. To

prepare wire before installing connector, all aluminum wire must

be “brush--scratched” and coated with a corrosion inhibitor such as

Pentrox A. When it is suspected that connection will be exposed to

moisture, it is very important to cover entire connection completely

to prevent an electrochemical action that will cause connection to

fail very quickly. Do not reduce effective size of wire, such as

cutting off strands so that wire will fit a connector. Proper size

connectors should be used. Check all factory and field electrical

connections for tightness. This should also be done after unit has

reached operating temperatures, especially if aluminum conductors

are used.

Contactor

The contactor provides a means of applying power to unit using

low voltage (24v) from transformer in order to power contactor

coil. Depending on unit model, you may encounter single-- or

double-- pole contactors. Exercise extreme caution when

troubleshooting as 1 side of line may be electrically energized. The

contactor coil is powered by 24vac. If contactor does not operate:

1. With power off, check whether contacts are free to move.

Check for severe burning or arcing on contact points.

2. With power off, use ohmmeter to check for continuity of

coil. Disconnect leads before checking. A low resistance

reading is normal. Do not look for a specific value, as

different part numbers will have different resistance values.

3. Reconnect leads and apply low--voltage power to contactor

coil. This may be done by leaving high -- voltage power to

outdoor unit off and turning thermostat to cooling. Check

voltage at coil with voltmeter. Reading should be between

20v and 30v. Contactor should pull in if voltage is correct

and coil is good. If contactor does not pull in, replace

contactor.

4. With high-- voltage power off and contacts pulled in, check

for continuity across contacts with ohmmeter. A very low or

0 resistance should be read. Higher readings could indicate

burned or pitted contacts which may cause future failures.

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Bryant LEGACY 213R Service Manual Page 11

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