Operation manual
7
EWAD120~340MBYNN
Packaged air-cooled water chillers
4PW22683-1
Switching the unit on
1
Press the
J
key on the controller.
Depending on wheter or not a remote ON/OFF switch has been
configured (
refer to the installation manual
), the following
conditions may occur.
When no remote ON/OFF switch is configured, the LED inside
the
J
key lights up and an initialization cycle is started. Once all
the timers have reached zero, the unit starts up.
When a remote ON/OFF switch is configured, the following table
applies:
2
If the water chiller does not start after a few minutes, refer to
Switching the unit off
If no remote on/off switch is configured:
Press the
o
key on the controller.
The LED inside the
o
key goes out.
If a remote on/off switch is configured:
Press the
o
key on the controller or switch the unit off using the
remote on/off switch.
The LED inside the
o
key goes out in the first case and starts
blinking in the second case.
Switching units ON/OFF in a DICN system
If the
o
key is pressed on a unit with status
or
, all
other units with status
or
will be ON or OFF.
If the
o
key is pressed on a unit with status
,
only this unit will be ON or OFF.
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:
•
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 evaporator inlet water temperature.
•
: actual evaporator outlet water temperature.
2
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 the 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 circuit is limited by a remote contact.
•
: the actual value of one of the software timers is
not zero (refer to
•
the circuit is ready to start up when extra cooling
load is needed.
The 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 written down on the bottom of the screen.
The percentage is the actual cooling capacity of the unit.
3
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 circuit.
■
/
: high pressure of the refrigerant in circuit 1/2. The first
number stands for the pressure in bar, the second number
stands for the bubble point saturation temperature in degrees
Celsius.
■
/
: low pressure of the refrigerant in circuit 1/2. The first
number stands for the pressure in bar, the second number
stands for the dew point saturation temperature in degrees
Celsius.
4
Press the
h
key to enter the next screen of the readout menu.
To consult actual operational information about the ambient
temperature and the total running hours of the compressor.
5
Press the
g
key to return to the other readout menus.
Local key
Remote switch
Unit
o
o
o
o
LED
ON
ON
ON
ON
ON
OFF
OFF
Flashing
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
In case of emergency, switch off the unit by pushing the
emergency stopbutton.
NOTE
"Defining the schedule timer" on page 12
and “Customization in the service menu” chapter
“Setting of the changeable inputs and outputs” in the
installation manual.
NOTE
When a remote ON/OFF switch is configured, the
remote ON/OFF contact for all units with status
or
of a DICN network is the contact
connected to the master unit.
For units with status
, the remote
contact is the contact connected to this unit.
NOTE
If the user wants 1 unit to operate on his command
only, this unit is to be set to
.
It is recommended not to select the master unit for this
purpose. Even if the status of the master is set to
, it will still be the contact
connected to the master which will switch ON/OFF the
other units in
or
mode. It would
therefore never be possible to only switch the master
unit OFF remotely.
Switching OFF the master unit only, should in this case
be done by the local ON/OFF key on the master unit.
NOTE
For a DICN system, the
,
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.
