Bryant 333B-AV-036060-AA-JA, Troubleshooting Manual

Page: 19 / 46

STEP ACTION YES NO GO TO
26. Is inducer wheel okay? 28 27 —
27.
If possible, replace inducer wheel. Otherwise, replace inducer motor assembly.
NOTE: If inducer wheel shows signs of excessive deterioration, find cause by
checking venting, input rates, and temperature rise. If other parts are affected,
replace them.
— — 8
28. Is inducer wheel properly mounted to inducer motor shaft? 29 30 —
29. Does furnace have proper cell outlet plates and collector box? 31 30 —
30. Fix problem. — — 8
31.
You have excessive restriction in vent pipe or excessive leakage before pres-
sure tap in collector box. Check for the following:
• Restriction in vent pipe.
• Proper vent sizing for installation.
• Leakage in collector box.
• Leakage in heat exchanger.
NOTE: If leakage is due to excessive corrosion, find cause by checking venting,
input rates, and temperature rise. If other parts are affected, replace them.
— — 30
32.
Do you have 24 vac across connector terminal PL1-9 and C
OM
-24V on 2-stage
furnace control?
33 13 —
33.
You have an open wire or bad terminal on GRAY wire connecting PL1-9 to
PL2-2 on 2-stage furnace control. Repair it or replace harness.
— — 8
34.
Continue to observe furnace operation for 20 minutes or until status code starts
flashing.
— — 35
35. Does status code 31 flash? 37 36 —
36. Does a different status code flash? 7 8 —
37.
Turn power off and disconnect jumper wire across R, W/W1, and W2 thermo-
stat terminals.
— — 38
38.
Connect 1 side of slope manometer with a tee to collector box pressure tap.
Refer to Pressure Check Diagram in Appendix C.
— — 39
39. Turn power on and jumper R, W/W1, and W2 thermostat terminals. — — 40
40.
Do you have enough pressure across heat exchangers to prevent high-heat
pressure switch HPS from breaking when status code 31 flashes? Reference
high-altitude settings if a High-Altitude Pressure Switch Kit is installed. (See
Table 2.)
If this is a high-altitude installation and a High-Altitude Pressure Switch Kit is
not installed, replace pressure switch assembly with a High-Altitude Pressure
Switch Kit.
NOTE: High altitude is over 5500 ft for Category I vent and over 4000 ft for Cat-
egory III vent.
22 23 —
TABLE 2—HIGH-HEAT PRESSURE SWITCH HPS SETTINGS
MODEL NO.
FACTORY SETTINGS HIGH-ALTITUDE SETTINGS
Make Point Break Point Make Point Break Point
330AAV
330JAV
333JAV 0.58 in. wc
0.43
±
0.05 in. wc
(YELLOW LABEL)
0.54 in. wc
0.39
±
0.05 in. wc
(GRAY LABEL)
331AAV 0.67 in. wc
0.52
±
0.05 in. wc
(BLUE LABEL)
0.62 in. wc
0.47
±
0.05 in. wc
(RED LABEL)
333BAV 0.68 in. wc
0.54
±
0.04 in. wc
(ORANGE LABEL)
0.58 in. wc
0.44
±
0.04 in. wc
(LT. GREEN LABEL)
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