Carrier SUPRA 950Mt - Figure 4-8 Compressors; Replacing the Compressor

4-12
4.9
REP
LAC
ING
THE
COM
PR
ESS
OR
05 K
4 compressor
4 Cylinders
05 K
2 compressor
2 Cylinders
05 G
compre
ssor
6 Cylinders
Oil level
Oil level
Oil
level
Figure 4-
8
Compre
ssors
a.
Rem
ovin
g
If
co
mp
res
so
r
is
in
op
er
ati
ve
an
d
un
it
sti
ll
ha
s
refrige
rant
pressu
re,
frontsea
t
suction and
discha
rge
service valv
es to
trap most of
the refrigeran
t in
the unit.
If compressor runs, pump down the unit. (Refer to
section 4.5.a.)
1.
Slowly relea
se compres
sor pressure to a recovery
system.
2.
Remove bolts from suction and discha
rge service
valve flanges.
3.
Di
sc
on
ne
ct
wi
ri
ng
to
co
mp
re
ss
or
di
sc
ha
rg
e
te
mp
er
at
ur
e
se
ns
or
(C
DT
),
su
ct
io
n
pr
es
su
re
transducer (SPT), the wiring to the high pressure
switch (HP) and low pressure (BP) as necessary.
4. Rel
ea
se
id
le
r
pu
ll
ey
s
an
d
re
mo
ve
be
lts
.
The
n
remove the
compre
ssor from
chassi
s.
5.
Remove the pul
ley from the compres
sor
.
6. Drain
oil
from
def
ecti
ve
com
pre
sso
r
bef
ore
shi
ppi
ng.
b.
Install
ing
1.
T
o
ins
tall the
com
pre
sso
r,
rev
erse
the
pro
ced
ure
outlined when removing the compressor.
NOTE
The service replacement compressor is sold without
sh
uto
ff
va
lv
es
(b
ut
wi
th
va
lv
e
pa
ds
).
Cu
sto
me
r
sh
ou
ld
retain the original capacity control valves for use on
replacement compressor. Check oil level in service
replacement compressor. (Refer to sections 2.3, and
4.10).
2.
Atta
ch
two lines (with
han
d
val
ves near vacuu
m
pump) to the suction and discharge service valves.
Deh
ydra
te
and
eva
cua
te
com
pre
sso
r
to
500micron
s
(29.90” Hg vacuum = 75.9 cm Hg vacuum). Turn off
valves on both lines to pump.
3.
Fully backs
eat (open) both suction and dischar
ge
service valves.
4.
Rem
ove vacuu
m
pum
p
lin
es
and instal
l
man
ifol
d
gauges.
5.
Check refri
geran
t level (Refer to sectio
n 4.8.2).
NOTE
It is important to check the compressor oil leve
l of
the
new compressor and fill if necessary.
6.
Check com
presso
r oil level. (Refer to sectio
n 4.10)
Add oil if
neces
sary
.
7.
Check r
efrigera
nt cycle
s.
4.10
CHEC
KING 0
5K / 05
G COMP
RESS
OR OIL
LEVEL
a.
T
o check oil level in 05K com
press
or
1.
Ope
rat
e
the
un
it
in
hi
gh
sp
ee
d
co
ol
in
g fo
r
at l
ea
st
20
minutes.
2.
Ch
ec
k
the oil
si
gh
t
gl
as
s
on the
co
mp
re
ss
or
to
ensure that no foaming of the oil is present after 20
min
utes
of
ope
rati
on.
If
the
oil
is
foa
min
g
exc
ess
ive
ly
after 20 minutes of operation, check the refrigerant
system for flood-back of liquid refrigerant. Correct
this situation before performing step 3.