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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).
6.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Unit Troubleshooting
Visual inspection.
on Page 2-235
tasks completed.
Fan operates at low speed.
REASON FOR QUESTION
EPAC controller OK.
Does high speed fan lockout
Wire 1734 OK.
If plunger does not actuate
solenoid plunger actuate
LHS supply solenoid valve OK.
freely, fan will not operate at
LHS differential pressure
high speed.
freely?
sensing valve OK.
Wire 1733 OK.
POSSIBLE PROBLEMS
High speed fan lockout solenoid
Clean or replace
valve faulty.
solenoid valve
High speed fan lockout
NO
(Para 17-18).
differential pressure
Verify repair, go to
sensing valve faulty.
Step 10 of this Fault.
Low speed fan differential
pressure sensing valve faulty.
YES
2-234
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