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TM5-4120-384-14
5-19.
REFRIGERANT
PRESSURE
CHECK.-Continued
Open  high  (discharge)  pressure  service  valve slightly
e.
Tighten  high  pressure  hose
to  purge  air  from  hose.
connection  at  gage  fitting  as  soon  as  a  hissing  sound  is
heard.
f.
Open  low  (suction)  pressure  service  valve  sliqhtly  to
purge  air  from  hose.
Tighten  low  pressure  hose  connection
at  gage  fitting  as  soon  as  a  hissing  sound  is  heard.
Open
low
(suction)
and
high
(discharge)
charging
valves.
g.
h.
Both gages should read the same.
Check the reading with the
appropriate  column  in  Table  5-2.
If  the  system  is  even  partially
charged,  the  pressure  should  be  approximately  equal  to  that  shown
in  the  table  for  the  appropriate  ambient  temperature.
If  the
pressure  is  considerably  less  than  shown  in  the  table,  the  system
does  not  contain  enough  refrigerant  to  continue  the  pressure  check;
proceed  directly  to  leak  testing.
Turn  air  conditioner  on  and  operate  in  COOL  mode  with
i.
TEMPERATURE SELECTOR in full COOLER setting for a few minutes.
With  unit  operating
allow
gages
to
stabilize.
Take readings
j.
of
the
two  gages.
(1)  If  discharge  and  suction  pressures  are  at,  or  near,  the
same  value,  a  pressure  equalizer  solenoid  valve  L2  malfunction,  or
an  internal  compressor  failure  is  indicated.
5-40

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