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O
PERATION
The EWAD units are equipped with a digital controller offering a user-
friendly way to set up, use and maintain the unit.
This part of the manual has a task-oriented, modular structure. Apart
from the first section, which gives a brief description of the controller
itself, each section or subsection deals with a specific task you can
perform with the unit.
Depending on the model there are one or two cooling circuits in the
system. The models EWAD240~340 exist out of two circuits, whereas
the models EWAD120~170 only have one circuit. These circuits are
generally named C1 and C2 in the following descriptions. So all
information about circuit 2 (C2) is not applicable for EWAD120~170
models.
Digital controller
User interface
The digital controller consists of an alphanumeric display, labelled
keys which you can press and a number of LEDs.
Digital built-in controller
Figure - Digital built-in controller
f
key, to enter the main menu
o
key, to start up or to shut down the unit.
p
key, to enter the safeties menu or to reset an alarm.
keys, to scroll up or down through the screens of a menu
g
(only in case W, X or C appears) or to raise, respectively
h
lower a setting.
q
key, to confirm a selection or a setting.
Digital remote controller (to be ordered separately)
Figure - Digital remote controller
o
key, to start up or to shut down the unit.
p
key, to enter the safeties menu or to reset an alarm.
key, to scroll through the screens of a menu (only in case
k
W, X or C appears) or to raise, respectively lower a
setting.
q
key, to confirm a selection or a setting.
u
key, to enter the readout menu.
s
key, to enter the setpoints menu.
z
key, to enter the user settings menu.
e
key, to enter the timers menu.
r
key, to enter the history menu.
t
key, to enter the info menu.
y
key, to enter the input/output status menu.
EWAD120~340MBYNN
Packaged air-cooled water chillers
4PW22683-1
a
key, to enter the user password menu.
key, to enter the DICN menu, also referred to as network
d
menu.
i
key, has no effect on EWAD units.
NOTE
Temperature readout tolerance: ±1°C.
Legibility of the alphanumeric display may decrease in
direct sunlight.
How to enter a menu
Digital built-in controller
Scroll through the main menu using the g and h keys to move
the
mark in front of the menu of your choice. Push the q key
to enter the selected menu.
Digital remote controller
Press the corresponding menu key indicated in "User interface",
paragraph
"Digital remote controller" on page 6
Connection of a remote digital controller to the unit
For a remote digital controller a cable length of up to 600 metres
between the remote digital controller and the unit is allowed. This
gives the opportunity to control the unit from a considerable distance.
Refer to
"Cable for remote digital controller"
for cable specifications.
For units in a DICN configuration, the remote digital controllers of the
units can be installed at a distance of up to 50 metres by using a
6-ray telephone cable with a maximum cable resistance of 0.1 Ω/m.
NOTE
When a remote digital controller is connected to a
stand-alone unit, the adress of the remote digital
controller has to be set to 2 by means of the DIP-
switches on the back of the remote digital controller.
Refer to the installation manual "Setting the adresses
on the remote digital controller" for setting the adress.
When a remote digital controller is connected to a unit
that is part of a DICN network, the addresses have to
be set according to the instructions in the installation
manual.
Working with the unit
This chapter deals with the everyday usage of the unit. Here, you will
find how to perform routine tasks, such as:
"Setting the language" on page 6
"Switching the unit on" on page 7
"Consulting actual operational information" on page 7
"Adjusting the temperature setpoint" on page 8
"Resetting the unit" on page 8
Setting the language
If desired, the operating language can be changed to any of the
following languages: English, German, French, Spanish or Italian.
1
Enter the usersettings menu. Refer to chapter
menu" on page 6
2
Go to the appropriate screen of the usersettings menu using the
g and h keys.
3
Press q to change the operating language until the desired
language is active.
in the installation manual
"How to enter a
Operation manual
6
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