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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).
4.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Unit Troubleshooting
Visual inspection.
on Page 2-221
tasks completed.
22 to 28 vdc to high speed fan
REASON FOR QUESTION
lockout solenoid valve is
Is high speed fan lockout
present.
If high speed fan lockout
differential pressure sensing
EPAC controller OK.
differential pressure sensing
Fan control solenoid
valve is faulty, fan will not slow
valve free of dirt, clogging
valve OK.
down.
and damage?
High speed fan lockout solenoid
valve OK.
POSSIBLE PROBLEMS
High speed fan lockout
Replace valve
differential pressure sensing
(Para 17-18).
NO
valve faulty.
Verify repair, go to
Step 5 of this Fault.
YES
2-220
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