Carrier 58MCA Manuel d'instructions télécharger pdf (Page 9)

NOTE: If the polarity is not correct, the STATUS LED on the

control center will flash rapidly and prevent the furnace from

operating. The control system also requires an earth ground for

proper operation of the control center and flame sensing.

The 24-v circuit contains an automotive-type, 3-amp fuse located

on the control center. (See Fig. 13.) Any direct shorts of the 24-v

wiring during installation, service, or maintenance will cause this

fuse to blow. If fuse replacement is required, use ONLY a fuse of

identical size.

With power to the unit disconnected, check all electrical connec-

tions for tightness. Tighten all screws on electrical connections. If

any smoky or burned connections are found, disassemble the

connection, clean all parts, strip wire, and reassemble properly and

securely.

Reconnect electrical supply to unit and observe unit through 1

complete operating cycle. Electrical controls are difficult to check

without proper instrumentation; if there are any discrepancies in

the operating cycle, contact your dealer and request service.

Step 8—Troubleshooting

For an explanation of status codes, refer to service label located on

back of main furnace door or Fig. 17, and the Troubleshooting

Guide.

The control center stores 1 status code (representing the last fault

to occur) for a period of 48 hr or until the 115- or 24-v power is

interrupted.

NOTE: Removing blower access panel will open blower access

panel door switch and terminate 115-v power to control center.

The status code will be erased. Look into blower access panel sight

glass for current LED status BEFORE removing blower access

panel.

The unit’s component test is a useful troubleshooting tool since it

displays the current status code of the furnace and functionally

operates all furnace components except the gas valve. The com-

ponent test and methods to initiate it are described below.

COMPONENT TEST SEQUENCE

NOTE: All components are functionally operated except the gas

valve.

When component test is initiated, the following sequence of events

occurs:

1. LED flashes a status code 4 times.

2. Inducer motor starts and continues to run for remainder of

component test.

3. Hot surface ignitor is energized for 15 sec, then de-energized.

4. Main blower operates at cooling speed for 10 sec, then turns

off.

5. Main blower operates at heating speed for 10 sec, then turns

off.

6. Inducer motor stops.

Component test can be initiated by one of the following proce-

dures.

INITIATING COMPONENT TEST AND RETRIEVING STA-

TUS CODE BY REMOVING MAIN LIMIT SWITCH WIRE

NOTE: NO thermostat signal may be present at control center

and all blower time delay off periods must be completed.

1. Leave 115-v power to furnace turned on.

2. Remove main furnace door.

3. Look into blower access panel sight glass for current LED

status.

Fig. 13—Control Center

A95086



24V



HUM

GRYW

3-AMP FUSE

HUMIDIFIER TERMINAL

(24-VAC 0.5 AMP MAX)

LED OPERATION &

DIAGNOSTIC LIGHT

HARNESS CONNECTOR

24-V TRANSFORMER SEC-2

SPARE-1

SPARE-2

EAC-1

EAC-ELECTRONIC AIR CLEANER

TERMINALS (115-VAC 1.5 AMP MAX)

EAC-2

115-VAC (L2) NEUTRAL

CONNECTION

24-V THERMOSTAT

TERMINALS

BLOWER SPEED

SELECTION TERMINALS

INDUCER MOTOR

CONNECTOR

115-VAC (L1)

POWER SUPPLY

HOT SURFACE

IGNITOR CONNECTOR

HEAT

COOL

SEC-1

TEST/TWIN

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

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Carrier 58MCA Manuel d'instructions Page 9

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