EUWAC5~10FZ
Packaged air-cooled water chillers
4PW14037-1D
Installation and operation manual
10
■
ei
,
e0
: indicates that the supply voltage is exceedingly low (
EU
) or
exceedingly high (
EO
). In these cases contact a licensed
electrician,
■
fl
: 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.
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.
Resetting warnings
During normal operation, the display of the controller may start flash-
ing, alternately showing the inlet water temperature and the following
warning code:
■
n1
: indicates that the compressor requires maintenance: the
total running hours of the compressor (direct parameter
c9
) has exceeded the setting of the timer threshold for
maintenance warning (user parameter
cb
).
To reset the maintenance warning
n1
, 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
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
.
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 EUWAC 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 outlet water temperature,
■
c9
: to check the total running hours of the compressor,
■
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 timer 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,
■
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 is equipped with a single-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
NOTE
If the alarm codes
fl
and
h1
are flashing alternately,
the alarm is most probably caused by the reverse
phase protector.
NOTE
Do not forget to carry out the required maintenance
activities after resetting the timers.
Besides resetting timer
c9
(running hours of the com-
pressor), 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 9
and press the
A
and
Z
keys simultaneously for
approximately 5 seconds while the timer's value is dis-
played. The timer's value becomes
0
. Then succes-
sively press the
R
key and the
E
key to return to
normal operation.
12
°C
15
°C
compressor
inlet water temperature
ON
OFF
