Operation manual
9
EWWP045~06 ECB1~3MUW
Packaged water-cooled water chillers
4PW30041-1A
7
To save the modifications, press the
E
key. To cancel the
modifications, wait approximately 40 seconds.
In the first case, the controller saves the changes, leaves the list
of direct parameters and returns to normal operation, displaying
the inlet water temperature.
In the second case, the display starts flashing. Approximately
40
seconds later, the controller leaves the list of direct
parameters without saving the modifications. The inlet water
temperature reappears on the display.
Defining the heating temperature difference
To control the heating load, the unit is equipped with a two-step
thermostat. The thermostat's "heating temperature difference" can be
modified by means of direct parameter
r4
.
The default, limit and step values are:
■
Default value
3
.
0
°C
■
Limit values
0
.
3
to
19
.
9
°C
■
Step value
0
.
1
°C
To define the heating temperature difference, proceed as follows:
1
Enter the list of direct parameters.
2
Press the
A
key three times.
Direct parameter code
r4
appears on the display.
3
Press the
R
key to switch to the parameter value.
4
Select the appropriate setting using the
A
and/or
Z
key.
5
Press the
R
key to return to the list of parameter codes.
6
To adjust or to consult other direct parameters before saving the
modifications, select another direct parameter using the
A
and/
or
Z
key and then repeat from instruction 3 onwards.
7
To save the modifications, press the
E
key. To cancel the
modifications wait approximately 40 seconds.
In the first case, the controller saves the changes, leaves the list
of direct parameters and returns to normal operation, displaying
the inlet water temperature.
In the second case, the display starts flashing. Approximately
40
seconds later, the controller leaves the list of direct
parameters without saving the modifications. The inlet water
temperature reappears on the display.
Tasks carried out using user parameters
Entering the list of user parameters
Access to the list of user parameters is protected by the user
password (a 3-digit number between
0
and
199
).
To enter the list of user parameters, proceed as follows:
1
Press the
E
key for approximately 5 seconds.
The number
00
starts flashing on the display.
2
Enter the correct password using the
A
and/or
Z
key.
The password's value is
22
.
3
Press the
R
key to confirm the password and to enter the list of
user parameters.
The controller displays parameter code
:d
(which is the first user
parameter).
Defining the measurement unit
Depending on the setting of user parameter
:d
, all temperature
values are displayed in °C or in °F. The conversion formulas from °C
to °F and vice versa are:
■
T
°C
= (T
°F
– 32) / 1.8
■
T
°F
= (T
°C
x 1.8) + 32
If user parameter
d
is set to
0
, all temperatures appearing on the
display will be expressed in °C. If user parameter
:d
is set to
1
all
temperatures will be expressed in °F.
To define the measurement unit, proceed as follows:
1
Enter the list of user parameters.
Parameter code
:d
appears on the display.
2
Press the
R
key to switch to the parameter value.
3
Select the appropriate setting using the
A
and/or
Z
key.
4
Press the
R
key to return to the list of parameter codes.
5
To adjust or to consult other user parameters before saving the
modifications, select another user parameter using the
A
and/
or
Z
key and then repeat from instruction 2 onwards.
6
To save the modifications, press the
E
key. To cancel the
modifications wait approximately 40 seconds.
In the first case, the controller saves the changes, leaves the list
of user parameters and returns to normal operation, displaying
the inlet water temperature.
In the second case, the display starts flashing. Approximately
40
seconds later, the controller leaves the list of user
parameters without saving the modifications. The inlet water
temperature reappears on the display.
Defining the time delay between pump and compressor
startup
User parameter
c7
allows you to define the time delay between the
pump startup and the compressor startup. The default, limit and step
values for the time delay are:
■
Default value
15
sec
■
Limit values
0
to
150
sec
■
Step value
1
sec
To define the time delay, proceed as follows:
1
Enter the list of user parameters.
Parameter code
:d
appears on the display.
2
Select parameter code
c7
using the
A
and/or
Z
key.
Parameter code
c7
appears on the display.
3
Press the
R
key to switch to the parameter value.
4
Select the appropriate setting using the
A
and/or
Z
key.
5
Press the
R
key to return to the list of parameter codes.
6
To adjust or to consult other user parameters before saving the
modifications, select another user parameter using the
A
and/
or
Z
key and then repeat from instruction 3 onwards.
7
To save the modifications, press the
E
key. To cancel the
modifications wait approximately 40 seconds.
In the first case, the controller saves the changes, leaves the list
of user parameters and returns to normal operation, displaying
the inlet water temperature.
In the second case, the display starts flashing. Approximately
40
seconds later, the controller leaves the list of user
parameters without saving the modifications. The inlet water
temperature reappears on the display.
27
30
°
C
28.5
compressor
inlet water temperature
of condenser
ON
ON
OFF
OFF
compressor2
compressor1
