Do not use ethylene glycol (Prestone II antifreeze/coolant or
equivalent automotive type). Failure of plastic components
will occur.
5. Insert funnel in tube and pour up to 1 quart of antifreeze,
propylene glycol (RV, swimming pool antifreeze, or equiva-
lent) into funnel until it is visible at point where condensate
enters open drain. (See Fig. 15.)
6. Reconnect drain cap to inducer housing.
7. Replace main furnace door.
8. Propylene glycol need not be removed before restarting
furnace.
WIRING DIAGRAM
See Fig. 16 for Wiring Diagram.
TROUBLESHOOTING
Use the Troubleshooting Guide, the status code LED on the control
and the Component Test to isolate furnace operation problems.
Step 1—Status Codes
For an explanation of status codes, refer to service label located on
back of main furnace door or Fig. 17. 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 1 of the red main limit or flame
rollout switch wires 1 to 4 sec until the LED light goes out, then
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.
Fig. 12—Two-Stage Control
A02017
LHT
OFF
DLY
ON
OFF
W2
BLW
24-V-THERMOSTAT
TERMINALS
SETUP SWITCHES
LOW-HEAT ONLY AND
BLOWER OFF-DELAY
TWINNING AND/OR
COMPONENT TEST
TERMINAL
ACRDJ - AIR CONDITIONING
RELAY DISABLE JUMPER
TRANSFORMER 24-VAC
CONNECTIONS
PL1 - LOW VOLTAGE MAIN
HARNESS CONNECTOR
PL3
HUMIDIFIER TERMINAL
(24-VAC 0.5 AMP MAX.)
3-AMP FUSE
LED OPERATION &
DIAGNOSTIC LIGHT
115-VAC (L2) NEUTRAL
CONNECTIONS
PL2 - HOT SURFACE
IGNITER & INDUCER
MOTOR CONNECTOR
115-VAC (L1) LINE
VOLTAGE CONNECTION
EAC-1 TERMINAL
(115-VAC 1.0 AMP MAX.)
BLOWER SPEED
SELECTION TERMINALS
HI HEAT
LO HEAT
SPARE-1
SPARE-2
COOL
Y1
DHUM
G
COM
24V
WW1
Y/Y2
R
TEST/TWIN
HUM
1 2 3
PL
T
A
CRDJ
0.5-AMP024 VAC
FUSE 3-AMP
SEC-1
SEC-2
PL1
NEUTRAL-L2
1
EAC-2
BHT/CLR
BHI/LOR
PL3 1
BLWR
COOL
SPARE-1
SPARE-2
1-AMP@115 VAC
EAC-1
PR-1
IDR
HSIR
IDM
IHI/LOR
PL2
1
HSI HI LO
STATU
S
C
OD
EL
E
D
HI HEA
T
LO HEA
T
L1
Fig. 13—Winterizing the Furnace
A93058
32
°
F MINIMUM INSTALLED
AMBIENT OR FREEZE
PROTECTION REQUIRED
10
