EWLP012~065KAW1N
Condenserless water-cooled water chillers
4PW30043-1
Operation manual
8
Resetting warnings
During normal operation, the display of the controller may start
flashing, alternately showing the inlet water temperature and the
following warning code:
■
n1
: indicates that the compressor1 requires maintenance: the
total running hours of the compressor1 (direct parameter
c9
)
has exceeded the setting of the timer threshold for
maintenance warning (user parameter
cb
).
■
n2
: indicates that the compressor2 requires maintenance: the
total running hours of the compressor2 (direct parameter
ca
)
has exceeded the setting of the timer threshold for
maintenance warning (user parameter
cb
).
To reset the maintenance warning
n1
or
n2
, proceed as follows:
1
Enter the list of direct parameters by pressing the
R
key for
approximately 5 seconds.
The parameter code
r1
appears on the display.
2
Select parameter code
c9
or
ca
using the
A
and/or
Z
key.
3
Press the
R
key to switch to the parameter value.
4
Press the
A
and
Z
keys simultaneously for approximately
5 seconds.
The timer's value becomes
0
.
5
Press the
R
key to return to parameter code
c9
or
ca
.
6
Press the
E
key to return to normal operation.
Advanced features of the digital controller
This chapter gives an overview of the direct parameters and user
parameters provided by the controller. In the following chapter, you
will learn how you can set up and configure the EWLP unit using
these parameters.
Overview of the direct parameters
The list of direct parameters is accessible by pressing the
R
key for
approximately 5 seconds.
When scrolling through the list of direct parameters using the
A
and/
or
Z
key, the parameters appear in the following order:
■
r1
: to define the cooling temperature setpoint,
■
r2
: to define the cooling temperature difference,
■
r6
: to check the evaporator outlet water temperature,
■
r8
: to check the ambient temperature
■
c9
: to check the total running hours of the compressor1,
■
ca
: to check the total running hours of the compressor2,
■
cv
: to check the total running hours of the pump.
Overview of the user parameters
The list of user parameters is only accessible by means of the user
password. When scrolling through the list of parameters using the
A
and/or
Z
key, you see the direct parameters and user parameters.
The user parameters appear in the following order:
■
:d
: to define the measurement unit (°C or °F),
■
c7
: to define the time delay between the pump startup and the
compressor startup,
■
c8
: to define the time delay between the unit shutdown and the
pump shutdown,
■
cb
: to define the time threshold for maintenance warning,
■
p4
: to disable the buzzer or to define the activation period of the
buzzer in case of an alarm,
■
h7
: to activate or de-activate the remote on/off control,
■
h9
: to lock or unlock the controller keyboard,
■
ha
: to define the unit's serial address,
■
h8
,
hb
,
c6
: not used.
Tasks carried out using direct parameters
Entering the list of direct parameters
1
Press the
R
key for approximately 5 seconds.
The controller enters the list of direct parameters, displaying
parameter code
r1
.
Defining the cooling temperature difference
To control the cooling load, the unit with 1 compressor is equipped
with a single-step thermostat. The unit with 2 compressors is
equipped with a two-step thermostat. The thermostat's "cooling
temperature difference" can be modified by means of direct
parameter
r2
.
The default, limit and step values are:
■
Default value
3
.
0
°C
■
Limit values
0
.
3
to
19
.
9
°C
■
Step value
0
.
1
°C
To define the cooling temperature difference, proceed as follows:
1
Enter the list of direct parameters.
2
Press the
A
key once.
Direct parameter code
r2
appears on the display.
3
Press the
R
key to switch to the parameter value.
4
Select the appropriate setting using the
A
and/or
Z
key.
5
Press the
R
key to switch to the list of parameter codes.
6
To adjust or to consult other direct parameters before saving the
modifications, select another direct parameter using the
A
and/
or
Z
key and then repeat from instruction 3 onwards.
NOTE
Do not forget to carry out the required maintenance
activities after resetting the timers.
Besides resetting timer
c9
(running hours of the
compressor 1) and
ca
(running hours of the
compressor 2), it is also possible to reset timer
cv
which defines the total running hours of the pump. To
do this, consult the timer's value (refer to paragraph
"Consulting actual operational information" on page 7
and press the
A
and
Z
keys simultaneously for
approximately 5 seconds while the timer's value is
displayed. The timer's value becomes
0
. Then
successively press the
R
key and the
E
key to return
to normal operation.
for 1 compressor
for 2 compressors
12
15
compressor
inlet
water
temperature
of evaporator
ON
OFF
12
15
13.5
compressor(s)
inlet
water
temperature
of evaporator
ON
ON
OFF
OFF
compressor2
compressor1
