2
6
FR
CC
.P
C
.
007
.B8.
02
Application guidelines
Cycle rate limit
A l
o
w-
press
u
re
(LP
)
sa
f
et
y
s
w
it
ch
m
u
st
b
e
u
sed
.
D
eep
v
a
cuu
m
operations
o
f
a
s
c
ro
ll c
ompressor
c
an
c
a
u
se
interna
l
e
l
e
c
tri
c
a
l
ar
c
ing
and
s
c
ro
ll
insta
b
i
l
it
y. D
an
f
oss
SH
s
c
ro
ll c
ompressors
e
xh
i
b
it
h
ig
h v
o
lu
metri
c
e
ffi
c
ien
cy
and
ma
y
dra
w v
er
y
l
o
w v
a
cuu
m
l
e
v
e
l
s
, wh
i
ch c
o
ul
d
ind
uc
e
s
uch
a
pro
bl
em
. Th
e
minim
u
m
l
o
w-
press
u
re
sa
f
et
y
s
w
it
ch (l
oss
-
o
f-ch
arge
sa
f
et
y
s
w
it
ch
)
setting
is
gi
v
en
in
t
h
e
f
o
ll
o
w
ing
ta
bl
e
. F
or
s
y
stems
w
it
h
o
u
t
p
u
mp
-
do
w
n
,
t
h
e
LP
sa
f
et
y
s
w
it
ch
m
u
st
eit
h
er
b
e
a
man
u
a
l l
o
ck
o
u
t
de
v
i
c
e
or
an
a
u
tomati
c
s
w
it
ch
w
ired
into
an
e
l
e
c
tri
c
a
l l
o
ck
o
u
t
c
ir
cu
it
. Th
e
LP
s
w
it
ch
to
l
eran
c
e
m
u
st
not
a
ll
o
w f
or
v
a
cuu
m
operations
o
f
t
h
e
c
ompressor
. LP
s
w
it
ch
settings
f
or
p
u
mp
-
do
w
n
cycl
es
w
it
h
a
u
tomati
c
reset
are
a
l
so
l
isted
in
t
h
e
ta
bl
e
b
e
l
o
w.
Low pressure
Operating conditions
D
an
f
oss
re
c
ommends
a
restart
de
l
a
y
timer
to
l
imit
c
ompressor
cycl
ing
. Th
e
timer
pre
v
ents
re
v
erse
c
ompressor
rotation
, wh
i
ch
ma
y
o
ccu
r
d
u
ring
b
rie
f
po
w
er
interr
u
ptions
.
Th
e
s
y
stem
m
u
st
b
e
designed
in
a
w
a
y
t
h
at
g
u
arantees
a
minim
u
m
c
ompressor
r
u
nning
time
o
f
2
min
u
tes
so
as
to
pro
v
ide
f
or
s
uffi
c
ient
motor
c
oo
l
ing
a
f
ter
start
-u
p
a
l
ong
w
it
h
proper
oi
l
ret
u
rn
. N
ote
t
h
at
t
h
e
oi
l
ret
u
rn
ma
y v
ar
y
sin
c
e
it
depends
u
pon
s
y
stem
design
.
Th
ere
m
u
st
b
e
no
more
t
h
an
1
2
starts
per
h
o
u
r
,
a
n
u
m
b
er
h
ig
h
er
t
h
an
1
2
red
uc
es
t
h
e
ser
v
i
c
e
l
i
f
e
o
f
t
h
e
motor
-c
ompressor
u
nit
. A
t
h
ree
-
min
u
te
(18
0
-
se
c
)
time
o
u
t
is
re
c
ommended
.
N
ote
t
h
at
t
h
ese
t
w
o
di
ff
erent
l
o
w
press
u
re
s
w
it
ch
es
a
l
so
re
qu
ire
di
ff
erent
settings
. Th
e
l
o
w
press
u
re
p
u
mp
do
w
n
s
w
it
ch
setting
m
u
st
a
lw
a
y
s
b
e
w
it
h
in
t
h
e
operating
en
v
e
l
ope
, f
or
e
x
amp
l
e
2
.
3
b
ar
f
or
R41
0
A. Th
e
c
ompressor
c
an
b
e
operated
full
time
u
nder
s
uch c
ondition
.
Th
e
minim
u
m
l
o
w
press
u
re
sa
f
et
y
s
w
it
ch
setting
ma
y b
e
o
u
tside
t
h
e
norma
l
operating
en
v
e
l
ope
and
s
h
o
ul
d
on
ly b
e
rea
ch
ed
in
e
xc
eptiona
l
(
emergen
cy
)
sit
u
ations
, f
or
e
x
amp
l
e
1.
5
b
ar
f
or
R41
0
A.
Th
e
SH
3
8
0
and
SH48
5
in
c
orporate
an
interna
l
re
l
ie
f v
a
lv
e
set
to
open
b
et
w
een
t
h
e
interna
l h
ig
h
and
l
o
w
press
u
re
sides
o
f
t
h
e
c
ompressor
wh
en
t
h
e
press
u
re
di
ff
erentia
l b
et
w
een
t
h
e
dis
ch
arge
and
s
uc
tion
press
u
res
s
u
rpasses
3
1
to
3
8 b
ar
.
Th
is
sa
f
et
y f
eat
u
re
pre
v
ents
t
h
e
c
ompressor
f
rom
de
v
e
l
oping
dangero
u
s
ly h
ig
h
press
u
res
s
h
o
ul
d
t
h
e
h
ig
h
press
u
re
cu
t
-
o
u
t
, f
or
wh
ate
v
er
reason
,
f
ai
l
to
s
hu
t
do
w
n
t
h
e
c
ompressor
.
Internal pressure relief valve
T
T
TH
TH
KA
A1
A
2
A
3
A1
18
0
s
A
2
KA
~
~
P
ress
u
re
settings
R41
0
A
W
or
k
ing
press
u
re
range
h
ig
h
side
b
ar
(
g)
1
3
.
5
- 44.
5
W
or
k
ing
press
u
re
range
l
o
w
side
b
ar
(
g)
2
.
3
- 11.6
M
a
x
im
u
m
h
ig
h
press
u
re
sa
f
et
y
s
w
it
ch
setting
b
ar
(
g)
4
5
M
inim
u
m
l
o
w
press
u
re
sa
f
et
y
s
w
it
ch
setting
*
b
ar
(
g)
1.
5
M
inim
u
m
l
o
w
press
u
re
p
u
mp
-
do
w
n
s
w
it
ch
setting
**
b
ar
(
g)
2
.
3
* LP
sa
f
et
y
s
w
it
ch
s
h
a
ll
ne
v
er
b
e
by
passed
and
s
h
a
ll h
a
v
e
no
time
de
l
a
y.
** R
e
c
ommended
p
u
mp
-
do
w
n
s
w
it
ch
settings
: 1.
5
b
ar
b
e
l
o
w
nomina
l
e
v
ap
.
press
u
re
w
it
h
minim
u
m
o
f
2
.
3
b
ar
(
g)
HP
LP
Relief valve
