ICP (F/G)9MAE0601714A, Service And Technical Support Manual

Page: 22 / 39

SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MAE
Specifications subject to change without notice.
22 440 04 4700 00
Figure 7 Heating and Cooling Application Wiring Diagram with Single − Stage Thermostat
A11401
115-VOLT FIELD-
SUPPLIED
FUSED
DISCONNECT
JUNCTION
BOX
24-VOLT
TERMINAL
BLOCK
THREE-WIRE
HEATING-
ONLY
FIVE
WIRE
NOTE 2
NOTE 1
1-STAGE
THERMOSTAT
TERMINALS
FIELD-SUPPLIED
FUSED DISCONNECT
CONDENSING
UNIT
FURNACE
COM
R
W C Y R G
GND
GND
FIELD 24-VOLT WIRING
FIELD 115-, 208/230-, 460-VOLT WIRING
FACTORY 24-VOLT WIRING
FACTORY 115-VOLT WIRING
Connect Y/Y2-terminal as shown for proper 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.
208/230- OR
460-VOLT
THREE
PHASE
208/230-
VOLT
SINGLE
PHASE
WHT
BLK
WHT
BLK
W/W1
W2
Y/Y2
G
NOTES: 1.
2.
3.
BLOWER
DOOR
SWITCH
C
O
N
T
R
O
L
For an explanation of status codes, refer to service label
located on blower access door or Figure 14 , and the
troubleshooting guide which can be obtained from your
distributor.
Retrieving Stored Fault Codes
The stored status codes will NOT be erased from the control
memory, when 115 − or 24 − v power is interrupted. The control
will store up to the last 7 Status Codes in order of occurrence.
1. To retrieve status codes, proceed with the following:
NOTE : NO thermostat signal may be present at control, and all
blower − OFF delays must be completed.
a. Leave 115 − v power to furnace turned on.
b. Look into blower door sight glass for current LED
status.
c. Remove blower door.
NOTE : The Status Codes cannot be retrieved by
disconnecting the limit switch. To retrieve Status Codes, follow
the procedure below.
2. Turn Setup Switch, SW1 − 1 “ON.”
3. Manually close blower door switch.
4. Control will flash up to 7 Status Codes.
5. The last Status Code, or 8th Code, will be a heartbeat.
6. Turn SW1
− 1 “OFF.”
7. A heartbeat amber LED will appear and indicates proper
operation.
8. Release blower door switch, install blower door and or
refer to the SERVICE label for more information.
Component Self − Test
Component Test can ONLY be initiated by performing the
following:
1. Remove blower door.
2. Remove the wire from the “R” terminal of the control
board.
3. Turn Setup Switch, SW1 − 6 “ON.”
4. Manually close blower door switch.
Blower door switch opens 115 − v power to control. No
component operation can occur unless switch is closed.
Caution must be taken when manually closing this switch for
service purposes.
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury, or
death.
Blower door switch opens 115
− v power to furnace control. No
component operation can occur unless switch is closed.
Exercise caution to avoid electrical shock from exposed
electrical components when manually closing this switch for
service purposes.
Component Test sequence will function as follows:
1. The furnace control CPU turns the inducer motor IDM
ON at medium speed and keeps it ON through Step 4.
2. The furnace control CPU will test communication with the
modulating gas valve GV.
3. After waiting 15 seconds the furnace control CPU turns
the hot surface igniter ON for 15 seconds, then OFF.
4. The furnace control CPU then turns the blower motor
BLWM ON at mid − range airflow for 15 seconds, then
OFF.
5. After shutting the blower motor BLWM OFF the furnace
control CPU shuts the inducer motor IDM OFF.
NOTE : The EAC terminals are energized when the blower is
operating.
After the component test is completed, 1 or more status codes
(heartbeat, 2+5, 3+5, 4+1, 4+2) will flash. See Service label on
control door or Service/status Code instructions for explanation
of status codes.
NOTE : To repeat component test, turn setup switch SW1 − 6 to
OFF and then back ON.
6. RELEASE BLOWER DOOR SWITCH , reattach wire to
“R” terminal on furnace control board, replace blower
door.