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Page Title:
FAN SPEED DOES NOT DECREASE FROM HIGH TO LOW SPEED. (Cont) |
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 TM 9-2320-364-34-1
5. FAN DOES NOT DECREASE FROM HIGH TO LOW SPEED (CONT).
5.
TEST OPTIONS
KNOWN INFO
Unit Troubleshooting
Verify repair.
Does fan lower from high to
tasks completed.
low speed?
22 to 28 vdc to high speed fan
REASON FOR QUESTION
lockout solenoid valve is
present.
If fan lowers from high to low
EPAC controller OK.
speed, fault has been corrected.
Fan control solenoid
valve OK.
High speed fan lockout solenoid
valve OK.
High speed fan lockout
differential pressure sensing
valve OK.
POSSIBLE PROBLEMS
Fault not corrected.
NO
Notify supervisor.
YES
Fault corrected.
2-222
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