EVAPORATOR COIL SECTION.

TM 5-4120-364-13

(e) Tag and disconnect motor leads from terminal board (14, figure

3 - 6 ) and ground wire (3) from frame,

( f ) Remove nut (5), lockwasher (6) and bolt (7) and remove fan motor

( 9 ) from base (8) and frame.

(2) Inspect. I n s p e c t f a n r o t o r f o r l o o s e w i r e c o n n e c t i o n s , f r a y e d o r

burned wires or other evidence of damage which would impair s e r v i c e a b i l i t y .

( 3 ) Test. Check continuity of motor windings for open windings or wind-

i n g s shorted to motor frame. I f any of these conditions are f o u n d o r i f r o t o r b i n d s

indicating defective bearings, replace motor

(4) Replace.

( a ) Position replacement motor (9) on base (8) and secure with bolts

( 7 ) , lockwashers (6) and nuts (5). Do not tighten nuts at this time.

( b ) Connect ground wire (3) to motor capacitor mounting screw and to

frame.

( c ) Place fan housings (26, figure 3-5) over motor shaft on each side

o f motor and secure to frame with screws (9, 13, 24), washers (8, 12, 23), washers

( 7 , 11, 22) and nuts (6, 10, 21).

( d ) M a t c h d i r e c t i o n o f rotation arrows on fans with arrows on fan

h o u s i n g s and slide fans on to motor shaft. Position fans in the housings so that

t h e y are centered in the housings. T i g h t e n s e t s c r e w ( 2 8 ) i n f a n s t o s e c u r e f a n s t o

m o t o r shaft. Tighten motor mounting nuts (5, figure 3-6) to secure motor to frame

a n d to base.

(e) Connect motor leads to terminal board. (See figure 3-2, electrical

wiring

diagram).

( f ) Check direction of rotation of the fan motor. The fan motor must

b e wired for clockwise rotation. Direction is determined by looking at motor term-

i n a l end. Replacement motors are shipped wired for counterclockwise rotation. To

reverse direction of rotation, reverse the red and black leads inside motor junction

b o x . After the motor has been installed and wired, energize the unit to verify pro-

p e r r o t a t i o n . D i r e c t i o n of rotation arrows are marked on both the fans and the fan

housings.

(g) Install rings (20, figure 3-5) and secure to housings (26) with

w a s h e r s (19) and screws (18).

( h ) Refer to figure 3-3 and install front, rear and end panels.

EVAPORATOR COIL SECTION.

3-10.

a . C o v e r s , Panels and Frame.

( 1 ) Removal. Remove the covers and panels by turning the fasteners one-

quarter turn counterclockwise. (See figure 3-7).

3-12