(3)
Replacement,
See f i g u r e 4 - 1 4 and replace
the selector switch (23) or (36) as follows:
@)
Removal.
1. Remove the switch knob ( 1 8 o r 2 5 , f i g .
4 - 1 4 ) and escutcheon plate (20) or (27).
2. Remove the screws (21) or (28) which
secure selector switch (23) or (36) to panel (56).
3. On voltage selector switch (36) also
remove screw (30) and nut (31) which secure rear of
voltage selector switch [36) to the switch bracket (35).
4. Tag all leads to switch and remove
leads from selector switc!l (23) or (36).
5. Remove selector switch (23) or (36).
(b)
installation.
1. Reconnect wires as tagged, and re-
move tags.
2. Remount selector switches
( 2 3
a n d
3 6 , f i g . 4 - 1 4 ) escutcheo,l. plate (20) or (27), and knob
(18) or (25) using removal steps in reverse order.
b.
Load
Reject
Switch.
-
(1)
Inspection.
Remove cover ( 9 , f i g . 4 - 1 4 )
and inspect load reject switch (40) for positive action
between positions.
Check for loose connections.
Check bodv of switch for cracks, breaks, corrosion,
and other damage.
(2) Testing. To test the load reject switch
( 4 0 ,
f i g .
4 - 1 4 ) , use a multimeter and make continuity
check of switch positions, closed in automatic (zero
ohms) and open in manual (imrinity) positions.
(3)
Replacement.
To replace load reject
switch ( 4 0 , f i g . 4 - 1 4 ) , remove nut (37), washer (38),
and nut (39) tagging leads before removing lead reje@
switch. Install in reverse order of removal.
c.
Fan and Motor Assembly.
(1) Inspection. Remove cover ( 9 , f i g . 4 - 1 4 )
and inspec-t-rnciuntin~
grommets ( 5 , f i g . 4 - 1 4 ) ior de-
terioration and looseness, wiring leads for fraying,
and check fan brushes for wear.
Inspect fan blade
(2) fan guard ( 4 3 , f i g . 4 - 1 4 ) , and air outlet for foreign
material, and fan blade for damage and looseness.
Inspect motor assembly for unusual noises, signs of
overheating and other damage.
(2) Testing. During load bank testing
( p a r a
4 - 4 2 b . ) o%-scrvti-fhrough
fan ward that fan blade
rotates clockwise with air flow as shown on
f i g u r e
4 - 1 5 .
(3) Replacement. To replace fan blade
(
2 ,
f i g .
4 - 1 5 ) , remove tan guard ( 4 3 , f i g . 4 - 1 4 ) by re-
moving nut (41) and screw (42). Loo.?en setscrews
( 1 , f i g . 4 - 1 5 ) securing fan blade (2) and remcwe
blade from motor shaft. To replace grommets
( 5 ,
f i g . 4 - 1 5 ) , renlove fan and motor assembly ( 4 6 , f i g .
4 - 4 2
4 - 1 4 ) by removing nut (44) and screw (45) and then
remove screw ( 3 , f i g . 4 - 1 5 ) and washer ( 4 , f i g . 4 - 1 5 ) .
fnstall in reverse order of removal.
d. Circuit Breaker (Over Temperature Reset
Swi?ch.
(1)
Inspection.
Remove cover ( 9 , f i g . 4 - 1 4 )
and inspect the circuit breaker (48) for positive action
between positions, loose mounting, loose electrical
connections, and other damage,
(2)
Testing.
Test the circuit breakers as
follows:
bre&er (~) Tag leads and remove from circuit
(b) Using multimeter, verify continuity
(closed co=tacts) of circuit breaker in the ON position.
(c) Place circuit breaker in OFF position and
verify no ~ontinuity (open contacts).
(cJ) R?connect leads and remove tags.
(3)
Replacement.
To replace the circuit
breaker ( 4 8 , f i g . 4 - 1 4 ) , remove screws (47) and tag
leads before removing circuit breaker. fnstall in
reverse order of removal.
e.
Indicating Light.
(1)
Inspection.
Remove cover ( 9 , f i g . 4 - 1 4 )
and inspect indicating light for 100SC m~unting, loose
connections, corrosion and dam>~e.
Inspect lens and
lamp for looseness and damage.
(2)
Testing.
During load bank testing ( p a r a
4 - 4 2 b . ) , observe that indicating light lights.
(3)
Replacement.
To replace indicating light
( 4 9 t h r o u g h 5 4 , f i g . 4 - 1 4 ) , remove lens (49), bulb(50),
nut (51), washer (52), and nut (53), tagging leads be-
fore removing base (54).
Install in reverse order of
removal.
4 - 4 5 . L o a d R e j e c t R e l a y .
a.
Inspection.
Remove cover ( 9 , f i g . 4 - 1 4 ) , and
ins~ect load reject relay for loose mounting, damage,
and wiring connections for looseness.
b.
Testing.
Higher level of maintenance
is
req~ired.
c.
Replacement.
Higher level of maintenance
is
req~ired.
4 - 4 6 .
T e r m i n a l
B o a r d .
a.
Impection.
fnspect the terminal board ( 6 4 ,
f i g . 4 - 1 4 ) f o r loose nl&nting, loose electrical con-
nectioiis, cracks, breaks, and other damage.
b. Replace, []cmt.
To repIace the terminal board
( 6 4
f i g .
4 - 1 4 ) ,
r e m o v e nut (57), screw (58), washer