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TM5-4120-384-14
5 - 3 1 . DEHYDRATOR (FILTER/DRIER).
The  dehydrator  (filter-drier)  is  located  in  the  rear
(compressor/condenser)  compartment.  Replace  the  dehydrator
whenever  the  refrigerant  system  is  opened  for  any  reason.
a.
Removal.
(See
(1)
Disconnect
power
at
power
source.
(2)  (Models  F18H-3S  and  F18H-1S)  Remove  top  rear  cover  (para
4-11). (Models F18H-3SA and F18H-3SB) Remove top cover (para
(3)  Discharge
and
purge
refrigeration
system
per
5-11 and 5-12.
(4)
Remove
four
screws
and
two
mounting
clamps.
(5)
Disconnect
two
flare
nuts
and
remove
dehydrator
from
unit.
I n s p e c t dehydrator for damage and replace if damaged.
b.
Inspect/Replace.
Always replace dehydrator if refrigeration system is opened for any reason.
c.
Installation.
Replacement  dehydrators  are  packaged  with  sealing
caps  on  the  flare  fittings  to  prevent  moisture
contamination  of  the  desiccant  filtering  media.
Remove  these  caps  immediately  prior  to  installation.
Never  install  a  dehydrator  from  which  caps  have  been
removed for an extended or unknown period of time.
(1)
Connect
flare
fittings
to
each
end
of
dehydrator.
(2)
Install
mounting
clamps
and
secure
with
four
screws.
(3)  Leak
test
newly
connected
joints
and
all connections
in
the
area.
top rear  cover  (para
(4)  (Models  F18H-3S  and  F18H-1S)
Install
top cover  (para
4-11).  (Models  F18H-3SA  and  F18H-3SB)
Install
4-11).
(5)  Evacuate  and  charge  the  refrigeration
system
in
accordance  with  paragraphs  5-15  and  5-16.
Change 2
5-69

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