Operation manual
9
EWLD120~540MBYNN
Condenserless water-cooled water chillers
4PW22687-1
Consulting actual operational information
1
Enter the readout menu. Refer to the chapter
The controller automatically shows the first screen of the
readout menu which provides the following information of the
evaporator:
•
or
or
: manual/
automatic control mode operation. If the automatic control mode
is selected, the controller will indicate the active temperature
setpoint. Depending on the status of the remote contact, setpoint
one or setpoint two is active.
•
: actual inlet water temperature.
•
: actual outlet water temperature (EWLD120~260)
or mixed outlet water temperature (EWLD360~540).
2
Press the
h
key to enter the next screen of the readout menu.
This screen is only available for double circuit units.
This screen of the readout menu provides the following
information on the evaporator:
•
: actual outlet water temperature of circuit 1.
•
: actual outlet water temperature of circuit 2.
3
Press the
h
key to enter the next screen of the readout menu.
The
screen of the readout menu provides
information concerning the status of the different circuits.
•
: actual status of circuit 1.
•
: actual status of circuit 2.
When a circuit is ON, the following status information may
appear.
•
: 40% - this percentage refers to the activated capacity of
that specific circuit.
When a circuit is OFF, the following status information may
appear.
•
: one of the circuit safety devices is
activated (refer to the chapter
•
: the circuit is limited by a remote contact.
•
: the actual value of one of the software timers
is not zero (refer to the
•
the circuit is ready to start up when extra
cooling load is needed.
The four preceding OFF messages are written down in order of
priority. If one of the timers is busy and one of the safeties is
active, the status information says
.
The
is the percentage indication of the actual
cooling or heating capacity of the unit.
4
Press the
h
key to enter the next screen of the readout menu.
The
screen of the readout menu provides
information concerning the pressures of the first circuit.
■
: high pressure of the refrigerant in circuit
1,
respectively circuit
2. The first number stands for the
pressure in bar, the second number stands for the saturation
temperature in degrees Celsius.
■
: low pressure of the refrigerant in circuit
1,
respectively circuit
2. The first number stands for the
pressure in bar, the second number stands for the saturation
temperature in degrees Celsius.
5
Press the
h
key to enter the next screen of the readout menu.
(Only for EWLD340~540.)
The
screen of the readout menu provides
information concerning the pressures of the second circuit.
6
Press the
h
key to enter the next screen of the readout menu.
This menu is available if voltage and current transmitters are
installed. This readout menu provides information concerning
the voltage and the compressor current.
7
Press the
h
key to enter the next screen of the readout menu.
To consult actual operational information about the total running
hours of the compressors and about the ambient temperature.
8
Press the
g
key to return to the other readout menus.
Adjusting the temperature setpoint
The unit provides definition and selection of four or two independent
temperature setpoints.
In cooling operation, two setpoints are reserved for inlet control, the
other two are reserved for outlet control.
■
: inlet water temperature of evaporator, setpoint 1,
■
: inlet water temperature of evaporator, setpoint 2.
■
: outlet water temperature of evaporator, setpoint 1,
■
: outlet water temperature of evaporator, setpoint 2.
The selection between setpoint 1 and 2 is done by a remote dual
setpoint switch (to be installed by the customer). The actual active
setpoint can be consulted in the readout menu.
If the manual control mode is selected (refer to the "User settings
menu"), none of the above-mentioned setpoints will be active.
To adjust a setpoint, proceed as follows:
1
Enter the setpoints menu. Refer to the chapter
If the user password is disabled for setpoint modifications (refer
to the "User settings menu"), the controller will immediately
enter the setpoints menu.
If the user password is enabled for setpoint modifications, enter
the correct code using the
h
and
g
keys (refer to the
). Press
q
to confirm the password
and to enter the setpoints menu.
2
Select the setpoint to be adjusted using the
q
key.
A setpoint is selected when the cursor is blinking behind the
setpoint's name.
The "
" sign indicates the actual active temperature setpoint.
3
Press the
h
and
g
keys to adjust the temperature setting.
The default, limit and step values for the cooling (evaporator)
temperature setpoints are:
4
Press
q
to save the adjusted temperature setpoint.
When the setting has been confirmed, the cursor switches to the
next setpoint. When the setting has been cancelled, the cursor
returns to the upper left corner of the screen.
NOTE
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.
NOTE
When a circuit in is in a high pressure setback, the
indication of capacity will be flashing. A high pressure
setback is a prevention of load-up or a forced load-
down caused by a too high pressure.
NOTE
The customer is also allowed to define a setpoint in
function of an analog input.
NOTE
Refer to “Customization in the service menu” chapter
“Setting of the changeable inputs and outputs” in the
installation manual
default value
limit values
(a)
(a) For glycol units the lower limit of the cooling temperature setpoint
can be adapted in the factory. The following values apply:
: 5°C, 3°C, –2°C, –7°C
: 2°C, 0°C, –5°C, –10°C
-->
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"
-->
#
step value
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