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Table 4-2. Troubleshooting - TM-5-4120-337-140036
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TM-5-4120-337-14 Air Conditioner Vertical: Compact Self-Contained Air Cooled Electrical Motor Driven Manual
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Front Access Panel
Corrective Action
Probable
Cause
Malfunction
e. Securely clamp bulb to suction line
e. R e m o t e b u l b o f e v a p o r a t o r e x -
after insuring that there is solid
pansion valve or bypass expansion
metal to metal contact along the
valve not in good contact with
entire length of the bulb. Replace
r e f r i g e r a n t  s u c t i o n  line  or  not
damaged  insulation  around  the
properly  insulated.
bulb and the suction line (para 4-
62).
Replace defective component (para 4-
9. C o m p r e s s o r
cycles
intermittently.
Defective time delay relay or com-
40 or 4-41).
pressor relay.
Refer to malfunction No. 4.
10. High pressure cutout trips ex-
Restricted  or  insufficient  condenser
air flow.
cessively.
Refer to malfunction No. 3.
11. L O W pressure  cutout  trips  ex-
Restricted or insufficient evaporator
air flow.
cessively.
a. R e p l a c e  d e f e c t i v e  c o m p o n e n t s
a. D e f e c t i v e h e a t e r t h e r m o s t a t , m o d e
12. No  heat,  Fan  motor  runs
(para  4-51,  4-44  or  4-37).
selector switch or circuit breaker.
correctly.
b. Refer to fig. 1-5 for electrical check
b. D e f e c t i v e w i r i n g .
points.
Check  connections  for
tightness and wiring for shorted
conditions. Repair defective wiring
(para 4-49 and 4-53).
13. Low heat only, Fan motor runs
a. R e p l a c e  d e f e c t i v e  c o m p o n e n t s
a. D e f e c t i v e  t e m p e r a t u r e  c o n t r o l
(para  4-45,  4-41  or  4-44).
correctly.
thermostat, heater control relay or
mode selector switch.
b. Refer to fig. 1-5 for electrical check
b. D e f e c t i v e w i r i n g .
points.  Check  connections  for
tightness and wiring for shorted
conditions. Repair defective wiring
and
4-53).
c. R e f e r t o m a l f u n c t i o n N o . 5 .
c. N o p o w e r t o l o w v o l t a g e c o n t r o l
circuit.
a. R e f e r t o m a l f u n c t i o n N o . 3 .
14. lnsufficient
Fan
motor
insufficient
a. Restricted  or
runs correctly and heater controls
evaporator air flow.
b. R e p l a c e  d e f e c t i v e  h e a t i n g  e l e m e n t s
operating  properly.
b. D e f e c t i v e h e a t i n g e l e m e n t ( s ) .
c. R e f e r t o f i g u r e 1 - 5 f o r e l e c t r i c a l
c. D e f e c t i v e w i r i n g .
check points.  Check  connections
for tightness and wiring for shorted
conditions. Repair defective wiring
(para 4-49 and 4-53).
a. C l e a n f a n w h e e l s a n d a l i g n s o t h a t
15. A i r c o n d i t i o n e r n o i s y .
a. Fan wheels out of balance, binding
they  turn  freely  without  in-
or dirty.
terference with housings or guards.
If wheel is out of balance after
cleaning replace with a new wheel
and
4-31).
b. Tighten set screws and check to
b. F a n w h e e l s l o o s e o n d r i v e s h a f t .
insure that the key is in place (para
4-30 and 4-31).
c. T i g h t e n  m o u n t i n g  s c r e w s  w h i c h
c. F a n m o t o r l o o s e o n m o u n t .
secure the motor to the partition
and  the  motor  mounting  bracket
d. T i g h t e n f o u r b o t t o m c o m p r e s s o r
d. C o m p r e s s o r
m o u n t s loose.
mounting  bolts  (para  4-58).
Section VI. MAINTENANCE OF PANELS, COVERS, SCREENS,
GUARDS
AND
GRILLES
4-11. Top Panel
General
a. General. Removal of the top panel is
Refer to Figures 1.1 and 1.2 for the location of
n e c e s s a r y to provide access for servicing the heating
panels, covers, screens, guards and grilles.

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