EWAP110~340MBYNN
Packaged air-cooled water chillers
4PW22677-1
Operation manual
8
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.
Adjusting the temperature setpoint
The unit provides definition and selection of four independent
temperature setpoints. 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
), 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
immediately enter the setpoints menu.
If the user password is enabled for setpoint modifications, enter
the correct code using the
g
and
h
keys (refer to
). 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
g
and
h
keys to adjust the temperature setting.
The default, limit and step values for the cooling 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.
5
To adjust other setpoints, repeat from
step 2
.
Resetting the unit
The units are equipped with three kinds of safety devices: unit
safeties, circuit safeties and network safeties.
When a unit or circuit safety occurs, the compressor is shut down.
The safeties menu will indicate which safety is activated. The
screen of the readout menu will indicate
. 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. All units will work as stand alone
units.
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 deactivated.
The controller automatically switches to the corresponding
screen of the safeties menu: unit safety or circuit safety or
network safety.
2
Find the cause of shutdown and correct.
Refer to
"Listing activated safeties and checking the unit status"
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
step 2
.
4
It will only be necessary to switch the
o
key on again if a unit
safety occurs.
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 treated units, the lower limit of the cooling
temperature setpoint can be adapted by changing the
minimum operating temperature in the service menu (refer
to the installation manual). The following values apply:
: 5°C, 3°C, –2°C, –7°C
: 2°C, 0°C, –5°C, –10°C
!
-->
"
#
-->
$
step value
%&
%&
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 11
and
"Defining the floating setpoint settings" on
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.
