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Page Title:
FAN DOES NOT OPERATE AT HIGH SPEED. (Cont) |
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 TM 9-2320-364-34-1
6. FAN DOES NOT OPERATE AT HIGH SPEED (CONT).
7.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Unit Troubleshooting
Visual inspection.
on Page 2-237
tasks completed.
Fan operates at low speed.
REASON FOR QUESTION
EPAC controller OK.
Is high speed fan lockout
Wire 1734 OK.
If fan differential pressure
differential pressure sensing
LHS supply solenoid valve OK.
sensing valve is blocked or
LHS differential pressure
valve free of dirt, clogging
faulty, fan will not operate at
sensing valve OK.
and damage?
high speed.
Wire 1733 OK.
High speed fan lockout solenoid
valve OK.
POSSIBLE PROBLEMS
Replace valve
High speed fan lockout
(Para 17-18).
NO
differential pressure
Verify repair, go to
sensing valve faulty.
Step 10 of this Fault.
Low speed fan differential
pressure sensing valve faulty.
YES
8.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Unit Troubleshooting
Visual inspection.
on Page 2-237
tasks completed.
Fan operates at low speed.
REASON FOR QUESTION
EPAC controller OK.
Is low speed fan differential
Wire 1734 OK.
If low speed fan valve is blocked
pressure sensing valve free of
LHS supply solenoid valve OK.
or faulty, fan will not operate at
dirt, clogging and damage?
LHS differential pressure
high speed.
sensing valve OK.
Wire 1733 OK.
High speed fan lockout solenoid
valve OK.
High speed fan lockout
differential pressure
sensing valve OK.
Replace valve
(Para 17-18).
POSSIBLE PROBLEMS
NO
Verify repair, go to
Step 10 of this Fault.
Low speed fan differential
pressure sensing valve faulty.
YES
2-236
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