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O-CU06-DEC14-1
All specifications are subjected to change by the manufacturer without prior notice.
The English text is the
original instruction. Other languages are the translations of the original instructions.
6
Low pressure safety (Auto reset)
The low pressure safety switch is recommended to avoid
compressor operation at too lower suction pressure and
vacuum condition. The low pressure safety cut should never
be set below value as shown in the following table.
* M: Medium temperature; L: Low temperature
The low pressure cut off pressure is the setting of cut in
minus the differential.
3.9 Fan speed controller setting
The fan speed controller regulates the speed of the
condenser’s fan.
It keeps the condensing pressure at a steady level by
changing the speed of the fan according to the required
condensing pressure.
For model in Series 2 and 4
: Recommended setting for
range setting pointer/ range adjusting screw as table below:
Medium Temp
Refrigerant
R404A/R407C/R407F/R407A
R134a
Setting (bar)
19
Series 2- 13
Series 4 -10
Low Temp
Refrigerant
R404A/R407A/R407C/R407F
Setting
(bar)
JEHR model -19
JEHS model - 13
Cut off: Fan motor stops when the pressure decreases
below the value P
min
.
Note:
F.V.S. = Full Voltage Set Point (pressure setting for
maximum speed)
E.P.B. = Effective Proportional Band (6 bar)
P
min
= (F.V.S. – 6)
For Series 1 model
: Recommended setting for Series 1
model which using pressure switch to on/off fan:
Refrigerant
R404A/
R407A/
R407F
R134a
Setting
(bar)
Cut in
16
10
Setting
(bar)
Differential
7
7
The low pressure cut off pressure is the setting of cut in
minus the differential.
For model in
Series 3
, the fan speed controller setting as
shown below.
Important Note
There must be no more than 10 compressor starts per
hour. A higher number reduces the
service life of the
compressor. If necessary, use an anti-short-cycle timer in
the control circuit.
Minimum a 2
minute runtime
after each
start of compressor and a 3
minute idle time after each
stop & start are
recommended. Only
during the pump
down cycle may the compressor
run for much
shorter
intervals.
Low Pressure side range
adjusting screw
Clockwise: Decrease cut in
pressure setting
Anticlockwise: Increase cut in
pressure setting
Differential adjusting screw
Clockwise: Increase
differential pressure setting
Anticlockwise:Decrease
differential pressure setting
Low pressure
side connector
High pressure
side connector
High Pressure side range
adjusting screw
Clockwise: Increase cut off
pressure setting
Anticlockwise: Decrease cut off
pressure setting
Clockwise: Increase pressure
set point
Anticlockwise: Decrease
pressure set point
360° = 1 turn
Approx. 1.5 barg
MEDIUM TEMP MODEL
REFRIGERANT: R404A, R407A, R407F
FAN SPEED (RPM)
REFRIGERANT : R134a
FAN SPEED (RPM)
LOW TEMP MODEL
REFRIGERANT: R404A, R407A
FAN SPEED (RPM)
TEMPERATURE (C°)
TEMPERATURE (C°)
TEMPERATURE (C°)
Manual reset switch
