Wiring Diagram; Troubleshooting; Status Codes - Carrier 58MTB Service And Maintenance Instructions

SETUP SWITCHES
LOW-HEAT ONLY AND
BLOWER OFF-DELAY
24-V-THERMOSTAT
TERMINALS
HUMIDIFIER TERMINAL
(24-VAC 0.5 AMP MAX.)
3-AMP FUSE
LED OPERATION &
DIAGNOSTIC LIGHT
115-VAC (L2) NEUTRAL
CONNECTIONS
HI HEAT
LO HEAT
SPARE-1
BLOWER SPEED
SELECTION TERMINALS
Winterizing the Furnace
Fig. 18 - -
5. Insert funnel in tube and pour up to 1 quart of antifreeze,
propylene glycol (RV, swimming pool antifreeze, or equi-
valent) into funnel until it is visible at point where condens-
ate enters open drain. (See Fig. 19.)
6. Reconnect drain cap to inducer housing.
7. Replace main furnace door.
TWINNING AND/OR
COMPONENT TEST
TERMINAL
LHT
OFF
DLY
TEST/TWIN
HUM
0.5-AMP024 VAC
FUSE 3-AMP
SEC-1 SEC-2
EAC-2 NEUTRAL-L2
BLW
BHI/LOR BHT/CLR BLWR
COOL 1-AMP@115 VAC
SPARE-1 SPARE-2 EAC-1 PR-1
COOL
SPARE-2
VOLTAGE CONNECTION
EAC-1 TERMINAL
(115-VAC 1.0 AMP MAX.)
Two- - Stage Control
Fig. 17 - -
A07911
ACRDJ - AIR CONDITIONING
RELAY DISABLE JUMPER
HSI HI LO
115-VAC (L1) LINE
8. Propylene glycol need not be removed before restarting fur-
nace.

WIRING DIAGRAM

See Fig. 21 for Wiring Diagram.

TROUBLESHOOTING

Use the Troubleshooting Guide, the status code LED on the
control and the Component Test to isolate furnace operation
problems.

Status Codes

For an explanation of status codes, refer to service label located on
back of main furnace door or Fig. 20. The stored status codes will
NOT be erased from the control memory, if 115-or 24-v power is
interrupted. The control will store up to 7 Status Codes.
NOTE: Removing the blower access door will open the blower
access door switch and terminate 115- -v power to the control. To
read current status code, remove main furnace door. The status
code LED can be viewed through the sight glass on the blower
access door.
NOTE: NO thermostat signals may be present at control and all
blower off delays must be completed to view previous codes.
To retrieve previous codes, remove one of the red main limit or
flame rollout switch wires 1 to 4 sec until the LED light goes out,
the reconnect it. (Do not leave red wire disconnected for longer
periods of time as the control will assume an overtemperature
condition exists and will respond with blower operation.) This
places the control in the status recall mode and displays the first
code stored in memory.
13
TRANSFORMER 24-VAC
CONNECTIONS
PL1 - LOW VOLTAGE MAIN
HARNESS CONNECTOR
PL3
PL2 - HOT SURFACE
IGNITER & INDUCER
MOTOR CONNECTOR
A02017