Operation manual
7
EWLP012~065KAW1N
Condenserless water-cooled water chillers
4PW30043-1
Adjusting the cooling temperature setpoint
The EWLP units enable definition and modification of the cooling
temperature setpoint. The default, limit and step values for the
cooling setpoint are:
■
Default value
12
.
0
°C
■
Limit values
7
.
0
to
25
.
0
°C
■
Step value
0
.
1
°C
To adjust the cooling temperature setpoint, proceed as follows:
1
Press the
R
key for approximately 5 seconds to enter the list of
direct parameters.
The direct parameter code
r1
defining the cooling temperature
setpoint appears on the display.
2
Press the
R
key.
The actual cooling temperature setpoint appears on the display.
3
Press the
A
or
Z
key to raise, respectively lower the
temperature setting.
4
Press the
R
key to return to parameter code
r1
.
5
To save the adjusted temperature setpoint, press the
E
key. To
cancel the modification wait approximately 40 seconds.
In the first case, the controller saves the changes, leaves the list
of direct parameters and returns to its normal operation,
displaying the inlet water temperature.
In the second case the display starts flashing. Approximately
40
seconds later, the controller leaves the list of direct
parameters without saving the modified parameter. The inlet
water temperature reappears on the display.
Consulting actual operational information
The actual operational information that can be consulted in the list of
direct parameters consists of:
■
r6
: outlet water temperature evaporator,
■
r8
: ambient temperature,
■
c9
: total running hours of the compressor1,
■
ca
: total running hours of the compressor2,
■
cv
: total running hours of the pump.
To consult the actual operational information, proceed as follows:
1
Press the
R
key for approximately 5 seconds to enter the list of
direct parameters.
The direct parameter code
r1
defining the cooling temperature
setpoint appears on the display.
2
Depending on the information to be consulted, select parameter
code
r6
,
r8
,
c9
,
ca
or
cv
using the
A
and/or
Z
key.
3
Press the
R
key to consult the actual value of the selected
parameter.
4
Press the
R
key to return to the parameter codes.
5
To consult other actual operational information, repeat from
instruction 2 onwards.
6
To return to normal operation, press the
E
key or wait
approximately 40 seconds.
In the first case, the controller immediately leaves the list of
direct parameters and returns to normal operation displaying the
inlet water temperature.
In the second case, the display will start flashing. Approximately
40 seconds later, the controller leaves the list of direct para-
meters. The inlet water temperature reappears on the display.
Resetting alarms
When an alarm is detected, the following happens:
■
the buzzer is activated (if enabled by means of user parameter
p4
),
■
the alarm relay is energized,
■
the display starts flashing, alternately showing the alarm code
and the inlet water temperature.
The following alarm codes may appear on the screen:
■
a1
: indicates an anti-freeze alarm,
■
e1
: indicates that the NTC probe used to measure the
evaporator inlet water temperature is defective,
■
e2
: indicates that the NTC probe used to measure the outlet
water temperature is defective,
■
e3
: indicates that the NTC probe used to measure the ambient
temperature is defective,
■
ee
,
ep
: indicates that the EEPROM on the controller PCB inside the
unit is defective,
■
ei
,
e0
: indicates that the supply voltage is exceedingly low (
ei
) or
exceedingly high (
e0
). In these cases contact a licensed
electrician,
■
el
: indicates that the power supply has a "remarkable noise". In
this case contact a licensed electrician,
■
f l
: indicates that there was no water flow either during the
period of 15 seconds after the pump was started or for 5
seconds while the compressor is active,
■
h1
: indicates that a high pressure switch, the discharge thermal
protection or the overcurrent protection of the compressor
motor is activated,
■
l1
: indicates that the low pressure switch is activated.
To reset an alarm, proceed as follows:
1
Press the
O
key to acknowledge the alarm.
The buzzer is de-activated.
2
Find the cause of shutdown and correct.
Refer to the chapter
3
If the alarm codes
a1
,
f l
,
h1
or
l1
appear on the display, reset
the alarm manually by pressing the
A
and
Z
key
simultaneously for approximately 5 seconds.
In all other cases the alarm is reset automatically.
Once the alarm is reset, the error code no longer appears on the
display. The controller continues its normal operation, displaying
the inlet water temperature.
NOTE
By pressing any button while the display is flashing
and cancelling of all changes is in progress, the can-
celling process is stopped, the display stops flashing
and the user can continue to change the settings.
NOTE
To reset the timers
c9
,
ca
and
cv
, refer to chapter
"Resetting warnings" on page 8
NOTE
If the alarm codes
f l
and
h1
are flashing alternately,
the alarm is most probably caused by the reverse
phase protector or by the fuse for control circuit (F4)
that is blown.
Содержание Hydrocube EWLP012KAW1N
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