Operation manual
17
EWAQ080~260DAYN
Packaged air-cooled water chillers
4PW35556-1E
Defining controller settings
The second
ADVANCED
screen of the usersettings menu also allows
the user to define settings for the controller.
■
MAIN MENU
: set to
GRAPHIC
to let the main menu show the
graphical symbols or to
TEXT
to let the main menu show the
names of the menus.
■
LOGOUT TIMER
: set the time for automatic log out, between 01
and 30 minutes.
■
BUZZER IF SAFETY
: to activate or deactivate the buzzer
sound when an error should occur.
■
BACKLIGHT TIME
: to define the time (between 01 and 30
minutes) the light of the controller display will stay on after the
last manipulation of the controller buttons.
■
GRAPHIC READOUT
: to define if the graphical representation of
the first screen of the read out menu is present or not.
Submenu: Defrost
This submenu is not available for EWAQ units.
Submenu: Service menu
Only a qualified installer is allowed to enter the service menu.
Tasks of the timers menu
Checking the actual value of the software timers
As a protective measure and to ensure correct operation, the
controller's software features several countdown timers:
■
LOADUP (
LOADUP
– refer to the thermostat parameters): starts
counting when a thermostat step change has occurred. During
the countdown, the unit is not able to enter a higher thermostat
step.
■
LOADDOWN (
DWN
– refer to the thermostat parameters): starts
counting when a thermostat step change has occurred. During
the countdown, the unit will not be able to go to a lower thermo-
stat step.
■
FLOWSTART (
FLOWSTART
– 15 sec): counts down when the
water flow through the evaporator is continuous and the unit is in
standby. During the countdown, the unit cannot start up.
■
FLOWSTOP (
FLOWSTOP
– 5 sec): starts counting when the
water flow through the evaporator stops after the flowstart timer
has reached zero. If the water flow has not restarted during the
countdown, the unit will shut down.
■
PUMPLEAD (
PUMPLEAD
– refer to the pump control settings):
starts counting whenever the unit is switched on. During the
countdown, the unit cannot start up.
■
PUMPLAG (
PUMPLAG
– refer to the pump control settings):
starts counting whenever the unit is switched off. During the
countdown, the pump keeps running.
■
GUARDTIMER (
GRD11
/1
2
/
21
/
22
– 180 sec): starts counting
when the compressor (circuit 1/2) has been shut down. During
the countdown, the compressor cannot be restarted.
■
ANTIRECYCLING (
AREC11
/1
2
/
21
/
22
– 300 sec): starts
counting when the compressor (circuit 1/2) has started. During
the countdown, the compressor cannot be restarted.
■
MINIMUM RUNNING TIME (
M.RT
- 120 sec) starts counting
when the compressor has started. During the count down, the
compressor will not be switched off by the thermostat function.
To check the actual value of the software timers, proceed as follows:
1
Enter the
TIMERS MENU
. (Refer to the chapter
"How to enter a
menu" on page 8
.)
The controller displays the actual value of the
GENERAL
TIMERS
: the loadup timer, the loaddown timer, the flowstart
timer, the flowstop timer (when the unit is on and the flowstart
timer has reached zero), the pumplead timer and the pumplag
timer.
2
Press the
Ì
key to check the compressor timers.
The controller shows the actual value of the
COMPRESSOR
TIMERS
: the guard timers (one per circuit) and the antirecycling
timers (one per circuit).
Tasks of the safety menu
Listing activated safeties and checking the unit status
If the alarm buzzer is activated and the user presses the
π
key, the
controller automatically enters the safeties menu.
All active safeties are displayed:
UNIT
/
CIRCUIT 1
/
2
,
WARNING
or
NETWORK SAFETY
.
■
The controller will show the
UNIT SAFETY
screen of the
safeties menu when a unit safety was the cause of shutdown.
■
The controller will show the
CIRCUIT 1
/
2 SAFETY
screen of
the safeties menu when a safety of the circuit 1/2 was activated.
■
The controller will show the
NETWORK SAFETY
screen of the
safeties menu when a safety of the network was activated.
■
The controller will show the
UNIT WARNING
screen of the
safeties menu when a unit warning was activated.
1
Press the
π
key when the alarm buzzer is activated.
The appropriate safety screen with the basic information
appears. Press the
‡
key to go directly to the history menu and
see the detailed information. These screens provide information
about the unit status at the moment of shutdown (see
"Safety
menu
π
" on page 12
).
2
If more than one kind of safety is active (indicated by means of
^
,
v
or
÷
), use the
fi
and
Ì
keys to consult them.
Tasks of the history menu
Checking the safety info and the unit status after a reset
The information available in the safeties menu is also stored in the
history menu, where it is stored after resetting the unit or the circuit.
In this way, the history menu provides a means of checking the unit
status at the moment of the latest shutdown.
To check the safety info and the unit status, proceed as follows:
1
Enter the
HISTORY MENU
. (Refer to the chapter
"How to enter
a menu" on page 8
.)
The controller enters the last
HISTORY
screen which contains
basic information of the moment of this shutdown.
2
Press the
fi
and
Ì
keys to consult the other present
HISTORY
screens.
3
Press the
‡
key to see the detailed information.
NOTE
If changed on one of the units in a DICN configuration,
this setting is automatically transferred to all the other
units in the network.