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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).
3.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Unit Troubleshooting
Visual inspection.
on Page 2-219
tasks completed.
22 to 28 vdc to high speed fan
REASON FOR QUESTION
lockout solenoid valve is
Does high speed fan lockout
present.
If plunger does not actuate
solenoid valve plunger
EPAC controller OK.
freely, fan will not slow down.
Fan control solenoid
actuate freely?
valve OK.
POSSIBLE PROBLEMS
High speed fan lockout solenoid
valve faulty.
Clean or replace
High speed fan lockout
solenoid valve
differential pressure sensing
NO
(Para 17-18).
valve faulty.
Verify repair, go to
Step 5 of this Fault.
YES
2-218
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