Operation manual
7
EWLD120~540MBYNN
Condenserless water-cooled water chillers
4PW22687-1
Water supply
Fill the water piping, taking into account the minimum water volume
required by the unit. Refer to the "installation manual".
Make sure that the water is of the quality as mentioned in the
installation manual.
Purge the air at the high points of the system and check the operation
of the circulation pump and the flowswitch.
Power supply connection and crankcase heating
To switch on the crankcase heater proceed as follows:
1
Switch on the circuit breaker on the local supply panel. Make
sure that the unit is "OFF".
2
The crankcase heater is switched on automatically.
3
Check the supply voltage on the supply terminals L1, L2, L3, by
means of a voltmeter. The voltage must correspond to the
voltage indicated on the identification label of the unit. If the
voltmeter reads values which are not within the ranges specified
in the technical data, check the field wiring and replace the
supply cables if necessary.
4
Check the LED on the reverse phase protectors. If it lights up,
the phase order is correct. If not, switch off the circuit breaker
and call a licensed electrician to connect the wires of the power
supply cable in the correct phase order.
5
Check if the crankcaseheaters are warming up.
After 8 hours, the unit is ready for operation.
Fancontactor connection and operation
The compressor starts in 12%
for a period of 5 seconds. The field
supplied relay(s) between terminal 90 and 91 are activated.
After 5 seconds, the compressor-running changes over from
into
for a period of 15 seconds. The compressor load stays at 12%.
During this period, the additional field supplied relay(s) between
terminal 92 and 93 are activated.
Between terminal 94 and 95 a third and final fancontactor can be
activated.
From then onwards, if manual mode or automatic mode is used, the
field supplied relays are switched on or off according to the fan-step
load-up control.
General recommendations
Before switching on the unit, read following recommendations:
1
When the complete installation and all necessary settings have
been carried out, close all front panels of the unit.
2
The service panels of the switch boxes may only be opened by a
licensed electrician for maintenance purposes.
3
To prevent the evaporator from freezing and to avoid damage to
the LCD displays of the digital controller, never switch off the
power supply during winter.
Legibility of the alphanumeric display may decrease at low
temperatures.
O
PERATION
The EWLD120~540 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 EWLD340~540 exist out of two circuits, whereas
the models EWLD120~260 only have one circuit. These circuits are
generally named C1 and C2 in the following descriptions. So all
information about circuit 2 (
) is not applicable for EWLD120~260
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
Keys:
■
Digital remote controller (to be ordered separately)
Figure - Digital remote controller
In order to avoid compressor damage, it is necessary to
switch on the crankcase heater for at least 8 hours before
starting the compressor after a long period of standstill.
The relay of the contacts should not exceed a current of 4A
for each connector.
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.
g
h
keys, to scroll up or down through the screens of a menu
(only in case
W
,
X
or
C
appears) or to raise, respectively
lower a setting.
q
key, to confirm a selection or a setting.
o
key, to start up or to shut down the unit.
p
key, to enter the safeties menu or to reset an alarm.
k
key, to scroll through the screens of a menu (only in case
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.
