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1. Turn off electrical supply to furnace.
2. Remove main furnace door.
3. Disconnect cap from unused drain tap on inducer housing.
(See Fig. 14.)
4. Connect field-supplied 1/2-in. I.D. tube to upper inducer
housing drain connection.
5. Insert funnel in drain tube and pour up to 1 quart antifreeze,
propylene glycol (RV, swimming pool antifreeze, or
equivalent) 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.
CAUTION: Do not use ethylene glycol (Prestone II
antifreeze/coolant or equivalent automotive type). Failure
of plastic components will occur.
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
cotntrol and the Component Test to isolate furnace operation
problems.
A. Status Codes
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 stored status codes will NOT be erased from the
control memory if 115- or 24-v power in 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 for 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.
Record the code and repeat the disconnect and reconnect of the red
wire, recording each code until code 11 is displayed indicating no
addition codes. After the last code is displayed or after 2 minutes
in the code recall mode the control will return to normal standby
mode.
B. Component Test
WARNING: Blower access panel door switch opens
115-v power to control center. No component operation
can occur. Caution must be taken when manually closing
this switch for service purposes. Failure to follow this
warning could result in electrical shock, personal injury,
or death.
Use the Component Test to check furnace components for proper
operation. To initiate the component self-test sequence, shut off
the room thermostat or disconnect the ″R″ thermostat lead. Briefly
(approximately 2 sec) short the TWIN/TEST terminal to the C
OM
24V terminal. The status LED will turn off. The test sequence will
be as follows:
Fig. 11—Field Wiring
A99440
115-V FIELD-
SUPPLIED
DISCONNECT
AUXILIARY
J-BOX
24-V
TERMINAL
BLOCK
THREE-WIRE
HEATING-ONLY
FIVE WIRE
NOTE 1
NOTE 2
FIELD-SUPPLIED
DISCONNECT
CONDENSING
UNIT
TWO
WIRE
FURNACE
C
O
N
T
R
O
L
R
G
COM
WCR GY
GND
GND
FIELD 24-V WIRING
FIELD 115-, 208/230-, 460-V WIRING
FACTORY 24-V WIRING
FACTORY 115-V WIRING
208/230- OR
460-V
THREE
PHASE
208/230-V
SINGLE
PHASE
BLOWER DOOR SWITCH
WHT
BLK
WHT
BLK
NOTES: Connect Y-terminal in furnace as shown for proper blower operation.
Some thermostats require a "C" terminal connection as shown.
If any of the original wire, as supplied, must be replaced, use
same type or equivalent wire.
W
Y/Y2
GND
THERMOSTAT
TERMINALS
1.
2.
3.
—9—