ICP (F/G)9MAE0601714A Service and technical support manual - Warning

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.