Carrier 58MSA User Manual

Page 9

Step 9—Winterizing

Freezing condensate left in the furnace will damage the
equipment.

If the furnace will be off for an extended period of time in a
structure where the temperature will drop to 32°F or below,
winterize as follows:

1. Turn off electrical supply to furnace.

2. Remove main furnace door.

3. Disconnect drain tube from inducer housing. (See Fig. 13.)

4. Insert funnel in drain tube and pour antifreeze, propylene

glycol (RV, swimming pool antifreeze, or equivalent) into
furnace until it is visible at point where condensate enters open
drain. (See Fig. 14.)

5. Reconnect drain tube to inducer housing.

6. Replace main furnace door.

Do not use ethylene glycol (Prestone II antifreeze/coolant or
equivalent automotive type). Failure of plastic components
will occur.

WIRING DIAGRAM

See Fig. 15 for Wiring Diagram.

TROUBLESHOOTING

For an explanation of fault codes, refer to service label located on
back of main furnace door or Fig. 16, and the Troubleshooting
Guide.

The control center stores 1 status code (representing the last fault
to occur) for a period of 48 hrs or until the 115- or 24-v power is
interrupted.

NOTE:

Removing blower access panel will open blower access

panel door switch and terminates 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.

Fig. 12— Control Center

A95086

24V

HUM

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

A93058

F MINIMUM INSTALLED

AMBIENT OR FREEZE
PROTECTION REQUIRED