EWWP045~06 ECB1~3MUW
Packaged water-cooled water chillers
4PW30041-1A
Operation manual
6
Direct and user parameters
The digital controller provides direct and user parameters. The direct
parameters are important for the everyday usage of the unit, e.g. to
adjust the temperature setpoint or to consult actual operational
information. The user parameters on the contrary provide advanced
features such as adjusting time delays or disabling the buzzer.
Each parameter is defined by a code and a value. For example, the
parameter used to select local or remote on/off control has code
h7
and value
1
or
0
.
Working with the 16~24Hp units
This chapter deals with the everyday usage of the unit. Here, you will
learn how to perform routine tasks, such as:
■
"Switching the unit on" on page 6
■
"Adjusting the cooling temperature setpoint" on page 6
"Adjusting the heating temperature setpoint" on page 7
■
"Consulting actual operational information" on page 7
■
■
"Resetting warnings" on page 8
Switching the unit on
To switch the unit on, proceed as follows:
1
When the on/off digital input user parameter
h7
is set to
0
(=No),
press the
I
key for approximately 5 seconds to switch the unit
on in cooling mode (inlet water temperature control of
evaporator) or press the
Y
key for approximately 5 seconds to
switch the unit on in heating mode (inlet water temperature
control of condenser).
When the on/off digital input user parameter
h7
is set to
1
(=Yes), you can also switch the unit on using the remote on/off
switch (installed by the customer).
In both cases an initialization cycle is started and the
T
LED
starts blinking. The
I
LED or the
Y
LED lights up, indicating
whether cooling or heating mode is selected. Once all the timers
have reached zero, the unit starts up and the
T
LED lights up
permanently. The numeric display shows the actual inlet water
temperature of the evaporator in cooling mode or the actual inlet
water temperature of the condenser in heating mode.
2
When the unit is started up for the first time, or when the unit has
been out of operation for a longer period, it is recommended to
go through the following checklist.
Abnormal noise and vibrations
Make sure the unit does not produce any abnormal noises or
vibrations: check the fixations and piping. If the compressor
makes any abnormal noises, this may also be caused by an
overcharge of refrigerant.
Working pressure
It is important to check the high and low pressure of the
refrigerant circuit to ensure the proper operation of the unit and
to guarantee that the rated output will be obtained.
3
If the unit does not start after a few minutes, consult the actual
operational information available in the list of direct parameters.
Also refer to the chapter
Switching the unit off
To switch the unit off, proceed as follows:
1
When the on/off digital input user parameter
h7
is set to
0
(=No)
and the unit is on, press the
I
key for approximately 5 seconds
to switch the unit off.
The
I
LED and the
T
LED are extinguished.
2
When the on/off digital input user parameter
h7
is set to
0
(=No)
and heating mode is active, press the
Y
key for approximately 5
seconds to switch the unit off.
The
Y
LED and the
T
LED are extinguished.
3
When the on/off digital input user parameter
h7
is set to
1
(=Yes), switch the unit off using the remote on/off switch.
The
I
LED or the
Y
LED (depending on the active mode) and
the
T
LED are extinguished.
Adjusting the cooling temperature setpoint
The units enable definition and modification of the cooling
temperature setpoint. The default, limit and step values for the
cooling setpoint are:
■
Default value
12
.
0
°C
■
Limit values
7
.
0
to
25
.
0
°C
■
Step value
0
.
1
°C
To adjust the cooling temperature setpoint, proceed as follows:
1
Press the
R
key for approximately 5 seconds to enter the list of
direct parameters.
The direct parameter code
r1
defining the cooling temperature
setpoint appears on the display.
2
Press the
R
key.
The actual cooling temperature setpoint appears on the display.
3
Press the
A
or
Z
key to raise, respectively lower the
temperature setting.
4
Press the
R
key to return to parameter code
r1
.
5
To save the adjusted temperature setpoint, press the
E
key. To
cancel the modification wait approximately 40 seconds.
In the first case, the controller saves the changes, leaves the list
of direct parameters and returns to its 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 modified parameter. The inlet
water temperature reappears on the display.
NOTE
Temperature readout tolerance: ±1°C.
Legibility of the numeric display may decrease in direct
sunlight.
The pressures measured will vary between a maximum
and minimum value, depending on the water and outdoor
temperatures (at the moment of measurement).
NOTE
In case of remote on/off control (
h7
=
1
), it is recom-
mended to install an on/off switch near the unit in
series with the remote switch. The unit can then be
switched off from either place.
The selection of cooling mode or heating mode can only
be carried out at startup.
Selecting an opposite mode without switching the unit off is
impossible.
NOTE
By pressing any button while the display is flashing
and cancelling of all changes is in progress, the can-
celling process is stopped, the display stops flashing
and the user can continue to change the settings.
