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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).
4.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Visual inspection.
Unit Troubleshooting
on Page 2-231
tasks completed.
REASON FOR QUESTION
Fan operates at low speed.
EPAC controller OK.
Does LHS supply solenoid
Wire 1733 OK.
If plunger does not actuate
High speed fan lockout solenoid
freely, fan will lose pressure for
valve plunger actuate freely?
valve OK.
high speed.
High speed fan lockout
differential pressure
sensing valve OK.
Low speed fan differential
pressure sensing valve OK.
Wire 1734 OK.
Replace LHS supply
POSSIBLE PROBLEMS
solenoid valve
NO
(Para 17-18).
LHS supply solenoid valve
Verify repair, go to
faulty.
Step 10 of this Fault.
LHS differential pressure
sensing valve faulty.
YES
Replace LHS
differential pressure
sensing valve
(Para 17-18).
Verify repair, go to
Step 10 of this Fault.
2-230
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