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Chapter 5. DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE INSTRUCTIONS - TM-5-4120-337-140054
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Section III. GENERAL MAINTENANCE - TM-5-4120-337-140056
Corrective Action
Malfunction
Probable Cause
f. Evacuate system  and  re-charge
f. M o i s t u r e i n r e f r i g e r a t i o n s y s t e m .
with correct amount of refrigerant
g. R a i s e s u p e r h e a t s e t t i n g ( p a r a 4 -
g. Superheat setting of evaporator
62).
expansion
valve  or  bypass
ex-
pansion valve set too low,
h. R e p l a c e d e f e c t i v e v a l v e ( p a r a 5 -
h. D e f e c t i v e  e v a p o r a t o r  e x p a n s i o n
18).
valve
or
bypass
expansion
valve.
a. C h a r g e t h e a i r c o n d i t i o n e r w i t h t h e
4. Little or no cooling. Compressor
a. I n s u f f i c i e n t c h a r g e o f r e f r i g e r a n t .
correct amount of refrigerant (para
and fun motor run.
b. 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
b. D e f e c t i v e  e v a p o r a t o r  e x p a n s i o n
(para 5-13, 5-17 , 5-18, 5-19, or 5-
valve, dehydrator, fluid pressure
22).
regulator, liquid line solenoid valve,
compressor
bypass
solenoid
valve,
bypass  expansion
valve  or
com-
pressor.
c. C h a r g e t h e a i r c o n d i t i o n e r w i t h t h e
c. E x c e s s i v e r e f r i g e r a n t c h a r g e ,
correct amount of refrigerant (para
d. L o w e r s e t t i n g i f s u c t i o n p r e s s u r e i s
d. I m p r o p e r s e t t i n g o f f l u i d p r e s s u r e
high or raise the setting if the
regulator.
suction is too low (para 5-19).
e. L o w e r t h e s e t t i n g i f t h e s u c t i o n
e. I m p r o p e r s e t t i n g o f t h e s u p e r h e a t
pressure is too low and raise the
for the evaporator expansion valve
setting if the superheat is too low.
or the bypass expansion valve,
f. R e p l a c e t h e e x t e r n a l e q u a l i z e r l i n e
f. E x t e r n a l  e q u a l i z e r  l i n e  o f  t h e
5-9).
evaporator expansion valve kinked
or  obstructed.
g. E v a c u a t e t h e s y s t e m a n d r e - c h a r g e
g. A i r o r o t h e r n o n - c o n d e n s i b l e s o r
with  the  correct  amount  of
moisture
in
the
refrigeration
refrigerant (para 5-8).
system.
a. R e p l a c e c o m p r e s s o r ( p a r a 5 - 2 2 ) .
5. Compressor cycles off.
a. D e f e c t i v e  c o m p r e s s o r
thermal
overload  protector.
a. R e p l a c e h i g h p r e s s u r e c u t o u t ( p a r a
a. Defective
high
pressure
cutout.
6.
High  pressure
cutout
trips
ex-
5-15).
cessively.
b. C h a r g e t h e a i r c o n d i t i o n e r w i t h t h e
b. E x c e s s i v e r e f r i g e r a n t c h a r g e .
correct amount or refrigerant (para
c. E v a c u a t e t h e s y s t e m a n d r e - c h a r g e
c. A i r  o r  o t h e r  n o n - c o n d e n s i b l e s
in
with  the  correct  amount  of
refrigeration  system.
refrigerant (para 5-8).
a. R e p l a c e l o w p r e s s u r e c u t o u t ( p a r a
a. Defective
low
pressure
cutout.
7.
Low
pressure
cutout
trips
ex-
cessively.
b. C h a r g e t h e a i r c o n d i t i o n e r w i t h t h e
correct amount of refrigerant (para
clogged
with
con-
c. D e h y d r a t o r
c. R e p l a c e d e h y d r a t o r ( p a r a 5 - 1 3 ) .
taminants.
d. L o w e r s u p e r h e a t s e t t i n g ( p a r a 4 -
d.  Superheat
set
too
high
on
62).
e v a p o r a t o r  expansion
valve on
bypass expansion valve.
e. R a i s e s e t t i n g o f f l u i d p r e s s u r e
e. F l u i d p r e s s u r e r e g u l a t o r s e t t o o
regulator (para 5-19).
low.
f. 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 ( p a r a
f. D e f e c t i v e  e v a p o r a t o r  e x p a n s i o n
5-17, 5-18 or 5-19).
valve. fluid pressure regulator,
liquid
line  solenoid  or  bypass
expansion  valve.
a. Replace
fan
motor
a. Noisy
fan
motor
from
worn
8. A i r c o n d i t i o n e r n o i s y .
b. R e p l a c e c o m p r e s s o r ( p a r a 5 - 2 2 ) .
b. D e f e c t i v e  c o m p r e s s o r .
. Replace  defective  evaporator
c. L i q u i d s l u g g i n g o f t h e c o m p r e s s o r .
C
expansion
valve  or  bypass  ex-
pansion  valve  (para  5-18).  Insure
that remote bulbs of these valves
are  securely  fastened  to  the  suction
line and properly insulated. Raise
the superheat settings to prevent
liquid
carry
over
5-2

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