Operation manual
13
EWLD120~540MBYNN
Condenserless water-cooled water chillers
4PW22687-1
Tasks of the user settings menu
Entering the user settings menu
The user settings menu is protected by the user password, a 4-digit
number between
$$$$
and
++++
.
1
Enter the
%
(Refer to the chapter
).
The controller will request the password.
2
Enter the correct password using the
g
and
h
keys.
3
Press
q
to confirm the password and to enter the user settings
menu.
The controller automatically enters the first screen of the user
settings menu.
To define settings of a certain function:
1
Go to the appropriate screen of the usersettings menu using the
g
and
h
keys.
2
Position the cursor behind the parameter to be modified using
the
q
key.
3
Select the appropriate setting using the
g
and
h
keys.
4
Press
q
to confirm the selection.
When the selection has been confirmed, the cursor switches to
the next parameter which can now be modified.
5
Repeat from instruction 2 onwards to modify the other
parameters.
Defining and activating the control mode
The unit is equipped with a thermostat which controls the cooling
capacity of the unit. Three different control modes exist:
■
manual control mode: the operator controls the capacity
himself -
- by setting:
•
39 3
(airflow of circuit 1, 2 in manual mode): off, low,
medium or high.
•
9
(capacitystep of circuit 1, 2 in manual mode):
0%, 30%~100%.
■
inlet control mode: uses the evaporator and/or condensor
entering water temperature to control the capacity of the unit -
■
outlet control mode: uses the evaporator leaving water
temperature to control the capacity of the unit -
Defining the thermostat settings
When automatic control mode is selected, the unit uses a thermostat
to control the cooling or heating capacity. However, the thermostat
parameters are not fixed and can be modified via the
%
screen of the user settings menu.
The default, limit and step values for the thermostat parameters are
shown in
Defining the lead-lag mode
(only for EWLD340~540)
The lead/lag mode determines which of both circuits starts up first in
case of a capacity demand.
The lead-lag parameters are:
■
&
Automatic: the controller decides whether circuit 1 or circuit 2
starts up first.
Manual C1>C2: circuit 1 starts up before circuit 2. If circuit 1 is
de-activated due to a failure, circuit 2 will start up instead.
Manual C2>C1: circuit 2 starts up before circuit 1. If circuit 2 is
de-activated due to a failure, circuit 1 will start up instead.
■
&
: In the automatic mode, the number of hours
indicated on the display is the maximum difference between the
running hours of both circuits. This value is important for
maintenance purposes. It should be set high enough so that
both circuits do not require maintenance at the same time and
that at least one circuit can remain constantly active.
The lower and upper limits are 100 and 1000 hours respectively.
The default value is 1000 hours.
■
5
: If this parameter is set on
(Yes), both circuits
will try to go up in capacity alternatingly.
If this parameter is set on
(No), the leading circuit will try to go
to full capacity before the lagging circuit can startup.
Defining the capacity limitation settings
In the
% %
screen up to four possible capacity
limitation settings can be configured.
A capacity limitation can be activated:
■
:
•
: see
"Defining the schedule timer" on
•
when a changeable input is configured as
capacity limitation.
•
: to activate capacity limitation 1.
•
: the capacity limitation is not active.
■
! "
: capacity limitation value of circuit 1 in
case of capacity limitation 1/2/3/4.
Defining the pump control settings
The
screen of the user settings menu allows the user
to define the pump-leadtime and pump-lagtime.
■
: used to define the time that the pump must run
before the unit (or the compressor in case
is selected in a DICN configuration) can start up.
■
: used to define the time that the pump keeps
running after the unit (or the compressor in case
is selected in a DICN configuration) has been
stopped.
Defining the schedule timer
To activate the screens of the schedule timer or holiday period, these
first need to be enabled by changing their setting to
in the
appropriate screen. To de-activate the schedule timer or holiday
period, their setting needs to be reset to
. (See
The
screen of the user settings menu allows the
user to define the schedule timer settings.
NOTE
To activate manual control mode, select
as
present mode. To de-activate the manual control
mode, select
or
as
present mode.
For units in a DICN configuration:
When changing the control mode on one of the
units, it is automatically transferred to all other
units.
Manual control mode however can only be
selected on units with status
.
NOTE
■
If changed on one of the units in a DICN
configuration, this setting is transferred to all other
units in the network.
■
A functional diagram showing the thermostat
parameters can be found in
NOTE
Refer to “Customization in the service menu”,
chapter “Setting of the changeable digital inputs
and outputs” in the installation manual