Evacuating And Recharging - Maytag 56326 Service Manual

EVACUATING AND RECHARGING
T he fo l l o w i n g g e n e ral i n for ma ti o n a p plies
t o a l l sy s t e m s co ve re d i n thi s ma n ua l .
EVACUATING
Any ti m e t he s e a l e d syste m i s o pe n e d an d
t h e re fr i g e ra n t ch a rg e re mo ve d, yo u m u st
i n s t a l l a n e w s e r v i c e d r i e r a n d t h o r o u g h l y
e va c ua t e b e f o re re c ha rg i n g. Eve n tho u g h
a c omp l e te e v a cu a tio n ta kes a d d iti o n al
t i m e , i t w i l l s a v e t i m e i n t h e l o n g r u n .
1 . O p e n t h e c o mp re ssor lo w si d e p ro c-
e s s t u b e a s c l o se to the p in ch e d e nd
a s p o s s i b le . T h i s w il l l ea ve su fficie n t
ro o m f o r p i n c h i n g o ff a t th e con clu -
s i o n .
2 . In s t a l l a s er vi ce val ve on th e p ro ce ss
t u b e .
3 . C o n n e c t y o u r v a c u u m p u m p t o t h e
s e r vi c e v a l v e th ro u g h a g au g e man i-
f o l d as s h o wn . L e a ve th e se rvice va lve
c l o s e d . U s e a g o o d vacu u m p ump , o n e
in w h i ch y o u ch a n ge oi l ofte n fo r th e
mo st e f f i c i e n t o p e ra tio n .
4 . St art th e va cu u m p u mp a n d o p e n its
di s c h ar g e va l v e . T h en sl o wl y o p en its
su ct i on va l ve a n d th e se rvi ce val ve o n
th e co m pr e s s o r p r oce ss tu be .
CAUTION: lf you are using an extremely
efficient vacurlm pump, just crack its suc-
tion valve for the f irst minute - then slowly
open it. This will prevent the system oil
from foaming and being drawn into the
pump in large volume. lf this should hap-
pen, the system oil, containing trapped
refrigerant, will contaminate your pump,
and, of course, reduce the amount of oil in
the compressor.
5 . P u l l a v a c u u m f o r a b o u t 2 0 m i n u t e s -
t h i s s h o u l d g i v e y o u a r e a d i n g o f n e a r
500 microns, or 29.6 inches of vacuum
o n a c o m p o u n d g a u g e . A f t e r p u l l i n g a
vacuum f or 20 minutes, you can c los e
o ff the valve of the pump while leaving
the m icr on gauge in the syst em . Then
o bser ve t he m icron gauge (or c om-
p ound gauge) for a f ew m inutes. lf the
reading rises, you could have a leak in
the system.
EXTERNAL
VACUUM
P U M P
SYSTEM
COMPRESSOR
GAUGE
MANIFOLD
6 .
7 .
C lose the m anifold valve
" A" and s top
t h e v a c u u m p u m p .
C o n n e c t y o u r s i g h t g l a s s c h a r g i n g c y l -
inder t o the gauge m anifold and, after
p u r g i n g t h e l i n e , o p e n v a l v e " B " a n d
induce a char ge of r ef rigerant into the
system until it is pr essur ized to 35 or
4 0 P , S . l . G . T h e n l e a k t e s t t h e l o w s i d e .
Af ter leak t esting t he low side, r un the
compr essor for a few minut es and leak
t e s t t h e h i g h s i d e .
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