Bryant 333BAV instruction manual Start, Ð9Ð

NOTES:

1.Refer to information label on blower compartment door for procedure for use of LED status codes and problem solving suggestions.

2.LED indicator is viewed through window in blower compartment door.

3.If 115-vac power is de-energized or interrupted during a call for heat, the indoor blower will run for 90 sec before a gas heating cycle begins – Code 12.

4.After replacing any component, verify correct operating sequence.

START

Turn thermostat OFF.

On furnace control, note current

settings for setup switches 1 (SW-1) and 2 (SW-2) then set SW-1 to OFF and SW-2 to ON.

Cycle 115-v power
off for 3 sec, then on.
Continuous LED?	No
Yes
Set thermostat to call for heat.
Set FAN to AUTO.
Draft inducer motor starts.	No
Yes	No
Is Code 22 displayed?
Yes
Flame present when not normal.
Replace gas valve.
15-sec inducer pre-purge.
Yes
Ignitor warms up and glows	No
orange/yellow; 17-sec warm-up.
Yes
Main burners ignite.	No
Yes
Main burners stay on.	No
Yes

Indoor blower motor starts on		No
heating speed after 45-sec
warm-up period.
	Yes
		No
Furnace runs until call for
heat ends.
	Yes
Turn thermostat to OFF; gas valve		No
shuts off burners; 5-sec inducer
post purge.
	Yes
		No
Indoor blower motor stops after
90, 135, 180, or 225 sec.

Yes

Heating sequence of operation complete. Remove blower door, move setup switch 1 (SW-1) to ON position and repeat process to check high-stage gas heat operation. (When finished return SW-1 and SW-2 to original desired settings.)

TROUBLESHOOTING

GUIDE

If LED is flashing rapidly, check line voltage polarity.

If Code 24 is displayed, check for blown fuse.

If LED is OFF, check line voltage and 24-v transformer.

If Code 45 is displayed, replace control.

Is indoor blower on ?

No

24v should be present across C and W. If not, check for:

1.Open thermostat.

2.Open 24-v fuse (FU1) – Code 24.

3.Failed transformer.

If Code 23 is displayed, the pressure switch(es) is stuck closed. Replace switch and/or check pressure tube for blockage.

System malfunction – Code 21.

115v should be present at the inducer motor. If so, replace inducer motor. If not, check 115-v wiring.

If Code 32 is displayed check for:

1.Open gas inlet pressure switch (when used).

2.Open pressure switch (LPS) and/or tube – Code 32.

3.Open draft safeguard switch (DSS) – Code 32.

4.Open auxiliary switch (ALS)(downflow only) – Code 32.

5.Check all low-voltage wiring connections.

115v should be present at the ignitor. If so, replace the ignitor; if not, check 115-vac wiring to ignitor.

LPS, DSS, or ALS open while HPS is closed (high-gas-heat only) –

Code 43.

Control will attempt to light burners 4 times (approximately 1 minute between attempts – Code 34). Voltage is present at the gas valve for 7 sec during each ignition trial. System will lockout after 4 attempts.

Is the gas valve control knob in the OPEN or ON position?

24v should be present across the gas valve terminals C and M/P (and C and HI for high-stage test) during the 7 sec ignition trial. If not, check all low-voltage wiring connections to valve.

If 24v are present, and main gas does not flow:

1.Is supply pressure between 4.5- and 13.6-in. wc? If not, adjust supply pressure.

2.If supply pressure is between 4.5- and 13.6-in. wc, replace gas valve.

Check ignitor position.

Check burner carryover gap.

Check manifold pressure (1.3- to 1.7-in. wc for low-stage gas heat; 3.2- to 3.8-in. wc for high-stage gas heat).

Check for proper orifice size.

Is Code 31 (high-gas-heat only), 32, 33, or 34 displayed? Check code information label to diagnose.

Check polarity of 115-v power at J-box and control – Rapid flashing LED.

Check ground continuity from J-box to control.

Check flame sensor microamps (4.0 nominal; 0.5 minimum for control to recognize flame).

See 2-Stage Gas-Fired Induced-Combustion Furnaces Troubleshooting Guide (PSC and ICM Blower Motors).

If not, check for:

1.Satisfied thermostat.

2.Open inlet gas pressure switch (when used).

3.Open pressure switch (LPS) – Code 32.

4.Open draft safeguard switch (DSS) – Code 32.

5.Open auxiliary limit (ALS)(downflow only) – Code 32.

6.Open 24-v fuse (FU1) – Code 24.

7.Open limit switch (LS) – Code 13 or 33.

8.Open flame rollout switch (FRS) – Code 13 or 33.

9.Check 115-v line voltage – LED off.

Check for sources of electrical noise interference (electronic air cleaners, nearby TV, or radio antennas).

If inducer and burners continue to operate, check for 24v at the gas valve. If 24v are present, verify that the thermostat is open across R and W. If no voltage is present, turn the gas valve control knob to the OFF position. Replace gas valve.

24v should be present across R and C. If not, check for:

1.Open limit switch (LS) – Code 13 or 33.

2.Open flame rollout switch (FRS) – Code 13 or 33.

24v should not be present across R and G. If so, turn thermostat FAN switch to AUTO.

!WARNING

ELECTRICAL SHOCK HAZARD

ONLY QUALIFIED AND TRAINED

SERVICE PERSONNEL SHOULD

PERFORM THIS PROCEDURE

	24v should be present across R
Yes	and C. If not, check for:
	1. Open flame rollout switch
	(FRS) – Code 33.

2.Open limit switch (LS) –

Code 33.

3.Check all low-voltage wiring connections.

		No
No
	Replace control only if all checks
	are OK.

No
	Replace control only if Code 45 is
	displayed, or if all checks are OK.

No
	Replace control only if Code 45 is
	displayed, or if all checks are OK.

No	Replace control if Code 45 is dis-
	played, or if all checks are OK.
	Clean flame sensor if microamps
	are below nominal.

No
	Replace control only if Code 45 is
	displayed, or if all checks are OK.

No
	Replace control only if Code 45 is
No	displayed, or if all checks are OK.
	Replace control only if Code 45 is
	displayed, or if all checks are OK.

A96062

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