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TM5-4120-384-14
5-17.
REFRIGERATION SYSTEM TROUBLESHOOTING.
The  two  most  likely  malfunction  symptoms  to  be  reported  to  direct
(1)  Unsatisfactory  color  or  bubbles
support  maintenance  are:
observed  in  the  sight  glass;  and  (2)  reduced  cooling  capacity.
Discussion  with  operators  and/or  organizational  maintenance
personnel  as  to  how  the  symptoms  appeared  can  often  be  more
informative  than  the  symptoms  themselves.
Sight  Glass  Indications.
a.
There  are  two  indications  that  may
be  observed  in  the  sight  glass:  (1)  color  as  a  result  of  moisture
content  in  the  refrigerant  and  (2)  vapor  bubbles  in  the  liquid
refrigerant.
(1)  Color  Change.
A  bright  green  color  indicates  that  the
refrigerant  is  dry.
As  moisture  content  increases  the  color  will
gradually  change  from  chartreuse  until  it  reaches  pure  yellow.  A
gradual  change  from  green  into  chartreuse  over  an  extended  period
of  time  is  normally  an  indication  that  the  dehydrator  is  becoming
A  sudden  change  of  color  is  highly
saturated  with  moisture.
unlikely  unless  a  rupture  occurs  allowing  all  refrigerant  to
escape.
(2)  Bubbles.
The  appearance  of  an  occasional  bubble  in
the  sight  glass  can  be  expected,  especially  when  operating  in  a
high  ambient  temperature.
A  gradual  increase  in  the  number  and
frequency  of  bubbles  is  usually  an  indication  that  the  refrigerant
The
charge  is  being  lost  from  the  system  through  a  small  leak.
number  and  frequency  of  bubbles  will  also  increase  if  the
refrigeration  system  becomes  overheated.
The  sudden  appearance  of
numerous  bubbles  is  usually  an  indication  of  a  serious  leak.
NOTE
When  the  system  goes  into  bypass  numerous  bubbles
will  appear.
This  is  normal.
Be sure that the
refrigeration  system  is  under  full  load  when
observing  the  sight  glass  for  refrigerant  condition.
Reduction  in  Cooling Capacity.
A  reduction  in  cooling
b.
capacity  will  occur  as  a  natural  result  if  refrigerant  is  lost  from
the  system;  with  a  total  loss  of  cooling  if  all  refrigerant  is
lost.
However,  in  some  conditions  a  considerable  proportion  of  the
refrigerant  may  be  lost  before  the  reduced  cooling  capacity  is
Sudden  or  erratic  reduction,  or  complete  loss  of
noticeable.
cooling  capacity  is  often  caused  by  the  malfunction  of  one  of  the
valves  in  the  refrigeration  system.
Cooling  capacity  will  also  be
reduced  if  the  refrigeration  system  becomes  overheated.
5-38

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