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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).
2.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Unit Troubleshooting
Fan operation test.
tasks completed.
Fan operates at low speed.
REASON FOR QUESTION
EPAC controller OK.
Does fan operate at high
If fan operates at high speed,
speed with connector MC59
POSSIBLE PROBLEMS
LHS supply solenoid valve
disconnected and hose 2777
and/or differential sensing valve
Wire 1734 faulty.
are faulty.
disconnected from LHS
LHS supply solenoid valve
control box?
faulty.
LHS differential pressure
sensing valve faulty.
Wire 1733 faulty.
High speed fan lockout solenoid
valve faulty.
Go to Step 5 of this
NO
High speed fan lockout
Fault.
differential pressure
sensing valve faulty.
Low speed fan differential
pressure sensing valve faulty.
YES
2-226

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