Bryant 333B-AV-036060-AA-JA, Руководство по устранению неисправностей

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STEP ACTION YES NO GO TO
18. Do you have 115 vac across BLACK and WHITE power leads at blower motor. 20 19 —
19.
You have an open wire or bad terminal on either the BLACK or WHITE wire
between 2-stage furnace control and blower motor, or the power choke (if
equipped) failed. Fix problem.
— — 7
STEP TERMINAL CONNECTIONS* VOLTAGE ACTION
20.
PL4-1
YELLOW (+)
to
PL4-3
BLACK (-)
-5 vdc to -10 vdc
If voltages are correct, go to Step 21. If not, replace 2-stage
furnace control. PL4-2
BLUE (+)
to
PL4-3
BLACK (-)
-5 vdc to -13 vdc
PL4-5
RED (+)
to
PL4-3
BLACK (-)
24 vac
21.
PL7-2
YELLOW (+)
to
PL7-10
BLACK (-)
-5 vdc to -10 vdc
If voltages are correct, go to Step 22. If not, repair or replace
ICM blower harness. PL7-12
BLUE (+)
to
PL7-10
BLACK (-)
-5 vdc to -13 vdc
PL7-13
RED (+)
to
PL7-10
BLACK (-)
24 vac
22.
PL7-1
YELLOW (+)
to
PL7-8
BLACK (-)
-5 vdc to -10 vdc
If voltages are correct, go to Step 23. If not, replace EZ-
SELECT airflow control. PL7-11
GREEN (+)
to
PL7-8
BLACK (-)
5 vdc to 10 vdc
PL7-14
RED (+)
to
PL7-9
BLACK (-)
24 vac
23.
PL9-14
YELLOW (+)
to
PL9-3
BLACK (-)
-5 vdc to -10 vdc
If voltages are correct, replace ICM blower motor. If not, repair
or replace ICM blower harness. PL9-15
GREEN (+)
to
PL9-3
BLACK (-)
5 vdc to 10 vdc
PL9-12
RED (+)
to
PL9-1
BLACK (-)
24 vac
STEP ACTION YES NO GO TO
24. Do you have 115 vac across HI-COOL and high voltage COMMON? 26 25 —
25. Replace 2-stage furnace control. — — 7
26. Remove tape from door switch and turn power off at main disconnect. — — 27
27.
Note location of all blower leads, then disconnect blower motor leads from
2-stage furnace control and capacitor.
— — 28
28.
Do you have continuity between the following motor leads:
• RED to WHITE
• YELLOW to WHITE
• BROWN to BROWN
• BLUE to WHITE
• BLACK to WHITE
• BROWN to WHITE
29 30 —
29.
Replace capacitor. If problem still exists after replacing capacitor, replace
blower motor.
— — 7
30.
Replace blower motor. If problem still exists after replacing blower motor, re-
place capacitor.
— — 7
31. Does furnace have a variable-speed ICM blower motor? 34 32 —
32. Do you have 115 vac across HI-COOL and high voltage COMMON? 33 25 —
33.
• Check blower motor speed selection. Refer to Appendix E to evaluate external
static.
• Check filter(s) and ductwork for restrictions.
• Check outdoor unit for correct suction pressure and verify charge.
— — 7
STEP TERMINAL CONNECTIONS* VOLTAGE ACTION
34.
PL4-1
YELLOW (+)
to
PL4-3
BLACK (-)
-5 vdc to -10 vdc
If voltages are correct, go to Step 35. If not, replace 2-stage
furnace control.
35.
PL7-2
YELLOW (+)
to
PL7-10
BLACK (-)
-5 vdc to -10 vdc
If voltages are correct, go to Step 36. If not, repair or replace
ICM blower harness.
36.
PL7-1
YELLOW (+)
to
PL7-8
BLACK (-)
-5 vdc to -10 vdc
If voltages are correct, go to Step 37. If not, replace EZ-
SELECT airflow control.
37.
PL9-14
YELLOW (+)
to
PL9-3
BLACK (-)
-5 vdc to -10 vdc
If voltages are correct, go to Step 38. If not, repair or replace
ICM blower harness.
STEP ACTION YES NO GO TO
38.
Is YELLOW COOL SIZE jumper on EZ-SELECT airflow control set to match
needed tons for cooling or heat pump system? (See Table 1.)
40 39 —
39.
Set YELLOW COOL SIZE jumper on EZ-SELECT airflow control to match
needed tons for cooling or heat pump system? (See Table 1.)
— — 7
40.
Note position of GREEN CONTINUOUS-FAN CFM jumper on EZ-SELECT air-
flow control, then disconnect it.
— — 41
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