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TM5-6625-2694-l3&P
Table
5-1.
Direct
Support
Troubleshooting
(cont'd.)
MALFUNCTION
TEST
OR
INSPECTION
CORRECTIVE
ACTION
NO
LOAD
APPLIED
TO
ALL
FANS
RUNNING.
3.
for
full
forward
Step 1.
Visually
check
switches
all wind
movement.
Check
voltage
across terminals 24 and 25 of each
a.
should
be 0
Duct
terminal
strip.
Measurement
Load
VDC.
is 0 VDC on
b.
three
terminal
If  measurement
all
strips, proceed to Step 3.
If measurement is 24
disconnect
power from
VDC,
Test Set.
terminals
Disconnect  and
tag leads from
terminal
strip.
Remove  Exhaust  Guard
24  and
25 to
and
connect
Wind
Switch
leads
ohmmeter
across
terminals.
Manually
infinite.
Ohmmeter  should  read
wind  switch  vane  forward.
move
Ohmmeter
should  read
0 Ohms.
Switch if
d.
Refer  to  paragraph  5-6  and
replace
Wind
ohmmeter does not read  0 Ohms.
Step  2.
Attach  ohmmeter  leads
Thermal
terminal
of
across
Switch.
Ohmmeter  should  read  0 Ohms.
Refer  to
paragraph  5-9  and  replace
Thermal
Switch
if
ohmmeter does not read  0 Ohms.
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