EWLD120~540MBYNN
Condenserless water-cooled water chillers
4PW22687-1
Operation manual
10
5
To adjust other setpoints, repeat from instruction 2 onwards.
Resetting the unit
The units are equipped with three kinds of safety devices: unit
safeties, circuit safeties and network safeties.
When a unit safety occurs, all compressors are shut down. The
safeties menu will indicate which safety is activated. The
screen of the readout menu will indicate
&
for all circuits. The red LED inside the
p
key lights up and
the buzzer inside the controller is activated.
When a circuit safety occurs, the compressor of the corresponding
circuit is shut down. The
screen of the readout menu
will indicate
&
for the circuit concerned. The
red LED inside the
p
key lights up and the buzzer inside the
controller is activated.
When a network safety occurs in a DICN configuration, the slaves not
detected by the network will function as stand alone units.
■
If a slave unit can not be found by the network, the red light
inside the
p
key of the master lights up and the buzzer inside
the control is activated.
■
If the master can not be found by the network, the red light
inside the
p
key of all the slaves light up and the buzzer inside
their controls are activated.
If the unit has been shut down due to a power failure, it will carry out
an autoreset and restart automatically when the electrical power is
restored.
To reset the unit, proceed as follows:
1
Press the
p
key to acknowledge the alarm.
The buzzer is de-activated.
The controller automatically switches to the corresponding
screen of the safeties menu: unit safety or circuit safety
2
Find the cause of shutdown and correct.
Refer to "Listing activated safeties and checking the unit status"
and the chapter
When a safety can be reset, the LED under the
p
key starts
blinking.
3
Press the
p
key to reset the safeties that are no longer active.
If required, enter the
or the
. (Refer to the installation manual “Setting the
password for safety reset”.)
Once all safety devices are disactivated and reset, the LED
under the
p
key goes out. If one of the safeties is still active, the
LED under the
p
key goes on again. In this case, return to
instruction 2.
4
It will only be necessary to switch the
o
key on again if a unit
safety occurs.
Advanced features of the digital controller
This chapter gives an overview and a brief functional description of
the screens provided by the different menus. In the following chapter,
you will find how you can set up and configure the unit using the
various menu functions.
All menus are directly accessible using the corresponding key on the
digital controller. The down arrow
X
on the display indicates that you
can go to the next screen of the current menu using the
h
key. The
up arrow
W
on the display indicates that you can go to the previous
screen of the current menu using the
g
key. If
C
is displayed, this
indicates that you can either return to the previous screen or can go
to the next screen.
Readout menu
The controller automatically enters the "readout menu" after startup.
Setpoints menu
Depending upon the settings in the user settings menu and on the
selected cooling/heating operation mode, the "setpoints" menu can
either be entered directly or by means of the user password.
User settings menu
The "user settings" menu, protected by the user password, allows a
full customization of the units.
NOTE
When a setpoint on a unit in a DICN system is set, this
setpoint will be transferred to all other units.
NOTE
Also consult
"Defining the schedule timer" on page 13
and
"Defining the floating setpoint settings" on
NOTE
To be able to reset the
circuit error
serveral precautions have to be taken. Refer to
“Resetting the
alarm” in the
installation manual.
If the user shuts down the power supply in order to repair a
safety, the safety will automatically be reset after power-up.
NOTE
The history information, i.e. the number of times a unit
safety or a circuit safety occurred and the unit status at
the moment of shutdown, can be checked by means of
the history menu.
To consult actual operational informa-
tion about the control mode, the inlet
and outlet water temperature of the
evaporator.
Note that for a DICN system, the
and
values
are the values of the individual units,
not of the system. Temperatures of the
system can be consulted in the first
screen of the network menu.
To consult information about the outlet
water temperature of the evaporator of
circuit 1 and 2 (only for EWLD340~540)
To consult information about the unit
status and the thermostat step.
To consult information about the
pressures of circuit 1.
To consult information about the
pressures of circuit 2 (only for
EWLD340~540).
To consult actual operational informa-
tion about the ambient temperature, the
total running hours of the compressors
and the number of compressor starts.
To define the temperature setpoints.
To define the manual settings and to
activate or de-activate manual control
mode.
To define the thermostat settings.
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