Bryant 355MAV User Manual download pdf (Page 12)

3. The control can also assist in troubleshooting by performing

a Component Test. The Component Test will functionally

operate all furnace components, except the gas valve.

NOTE: The component test feature will not operate if the furnace

control is receiving any thermostat signals or until all time delays

have expired.

a. To initiate Component Test proceed with the following:

(1.) Leave 115-v power to furnace turned on.

(2.) Remove main furnace door.

(3.) Remove blower access panel.

(4.) Turn setup switch SW1-6 to ON position.

(5.) Manually close blower access panel door switch.

Use a piece of tape to hold switch closed.

WARNING: UNIT MAY NOT OPERATE

Failure to follow this warning could result in electrical

shock, personal injury, or death.

Blower access panel door switch opens 115-v power to

control center. No component operation can occur unless

switch is closed. Caution must be taken when manually

closing this switch for service purposes.

b. When items (1) through (5) above have been completed,

the following will occur:

(1.) Inducer motor operates at medium speed through

step (3), then turns off.

(2.) After waiting for 15 seconds, hot surface igniter is

energized for 15 sec, then de-energized.

(3.) Main blower motor operates at midrange airflow for

15 seconds, then turns off.

(4.) After component operation test is completed, 1 or

more fault codes (11, 25, 41, or 42) will flash. See

service label on back of main furnace door or Fig.

15 for explanation of codes.

NOTE: To repeat component test, turn setup switch SW1-6 to

OFF and then back to ON.

c. After component test, perform the following:

(1.) Remove tape to release blower access panel door

switch and turn setup switch SW1-6 to OFF posi-

tion.

(2.) Replace blower access panel.

(3.) Operate furnace through 1 heat cycle to check for

proper operation and check LED status.

(4.) If furnace is operating properly and LEDs indicate

proper operation, replace main furnace door.

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Bryant 355MAV User Manual Page 12

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