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• Scroll Condensing Unit • JEHSCU
• Scroll Condensing Unit • JEHSCU
20
9
Installation & Commissioning
Safety pressure switch settings
The pressure s
w
itch
f
itted to condensing units
w
ith auto reset
f
or lo
w
pressure and manual reset
f
or high pressure are NOT
f
actory preset.
High pressure safety (Manual reset)
The high pressure sa
f
ety s
w
itch is required to stop the compressor, should the discharge pressure exceed the values sho
w
n in the
f
ollo
w
ing table. The
high pressure s
w
itch can be set to lo
w
er values depending on the application and the ambient conditions
Low pressure safety (Auto reset)
The lo
w
pressure sa
f
ety s
w
itch is recommended to avoid compressor operation at too lo
w
er suction pressure and vacuum condition. The lo
w
pressure
sa
f
ety cut should never be set belo
w
value as sho
w
n in the
f
ollo
w
ing table.
* M: Medium temperature; L: Low temperature
Model
S
eries
2
, 3, 4
Refri
g
er
a
nt R404A R134
a
Cut Out (b
a
r
g
)
2
8
2
3
Cut Out (psi
g
) 405 330
Model
S
eries
2
, 3, 4
Refri
g
er
a
nt R404A
R134
a
Applic
a
tion M*
L*
M*
Cut out (b
a
r
g
) 1.
2
0.3 0.3
Cut out (psi
g
) 18 5 5
Low Pressure side range
adjusting screw
Clockwise: Decre
a
se cut in
pressure settin
g
Anticlockwise:
Incre
a
se cut in pressure settin
g
High Pressure side range
adjusting screw
Clockwise: Incre
a
se cut off
pressure settin
g
Anticlockwise: Decre
a
se cut off
pressure settin
g
Differential adjusting screw
Clockwise: Incre
a
se differenti
a
l
pressure settin
g
Anticlockwise:
Decre
a
se differenti
a
l pressure
settin
g
Low pressure
side connector
Hi
g
h pressure
side connector
M
a
nu
a
l reset switch
Low pressure
=
Setting of
-
Setting of
c
ut off pressure
the
c
ut in
the differenti
a
l
EE
D
E
N
1
3
-
780A
_
Scro
ll
Condensing
U
nits
- JEH
SC
U.p
d
f 22
30
/
0
4/2
0
1
3
16:11:11