Operation manual
17
EWLD120~540MBYNN
Condenserless water-cooled water chillers
4PW22687-1
The changeable analog inputs are:
■
%% $:
: indicates the status of the analog input
■
%%$%$
: indicates the status of the analog input
■
%% $:
: indicates the status of the analog input
■
: indicates the status of the analog input
To check the inputs and outputs, proceed as follows:
1
Enter the
.
.)
The controller enters the first
screen.
2
Consult the other screens of the input/ouput menu using the
g
and
h
keys.
Tasks of the user password menu
Changing the user password
Access to the user settings menu and the setpoints menu is
protected by the user password (a 4-digit number between
$$$$
and
++++
).
To change the user password, proceed as follows:
1
Enter the
%
(Refer to the chapter
).
The controller will request the password.
2
Enter the correct password using the
h
and
g
keys.
3
Press
q
to confirm the password and to enter the password
menu.
The controller requests the new password.
4
Press
q
to start the modification.
The cursor is positioned behind
.
5
Enter the new password using the
h
and
g
keys.
6
Press
q
to confirm the new password.
When the new password has been confirmed, the controller will
ask to enter the new password a second time (for safety
reasons). The cursor is positioned behind
.
7
Enter the new password again using the
h
and
g
keys.
8
Press
q
to confirm the new password.
T
ROUBLESHOOTING
This section provides useful information for diagnosing and correct-
ing certain troubles which may occur in the unit.
Before starting the trouble shooting procedure, carry out a thorough
visual inspection of the unit and look for obvious defects such as
loose connections or defective wiring.
Before contacting your local dealer, read this chapter carefully, it will
save you time and money.
When a safety device was activated, stop the unit and find out why
the safety device was activated before resetting it. Under no circum-
stances safety devices may be bridged or changed to a value other
than the factory setting. If the cause of the problem cannot be found,
call your local dealer
Overview of safety messages
Symptom 1: The unit does not start, but the ON LED lights up
Symptom 2: The unit does not start, but the ON LED is flashing
NOTE
The default user password is
!"
.
NOTE
The actual password will only be changed when the
new password and the confirmed password have the
same value.
If changed on one of the units in a DICN configuration,
this setting is automatically transferred to all the other
units in the network.
When carrying out an inspection on the supply panel or on
the switch box of the unit, always make sure that the circuit
breaker of the unit is switched off.
Message safety menu
Symptom
$$
$
$";
$+
$
$+
$" 1 %
or
!
.
#
!
"
";
<
<
+
+
+
+ %
+
+!%
+"%
$" %
$
$+
$
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
The temperature setting is not
correct.
Check the controller setpoint.
The flowstart timer is still running.
The unit will start after approx. 15
seconds. Make sure that water is
flowing through the evaporator.
Neither one of the circuits can start
up.
Refer to "One of the circuits does not
start up" on page 18.
Unit is in manual mode (all
compressors at 0%).
Check on the controller.
Power supply failure.
Check the voltage on the supply
panel.
Blown fuse or interrupted protection
device.
Inspect fuses and protection
devices. Replace by fuses of the
same size and type (refer to chapter
"Electrical specifications" on
page 2).
Loose connections.
Inspect connections of the field
wiring and the internal wiring of the
unit. Tighten all loose connections.
Shorted or broken wires.
Test circuits using a tester and repair
if necessary.
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
The remote ON/OFF input is present
and the remote switch is off.
Put the remote switch on or disable
the remote ON/OFF input.
