EWWQ049~06 ECB2+3MUBW
Packaged water-cooled water chillers
D-EOMHP01008-17EU
Operation manual
12
Defining dual evaporator pump control
The
DUAL EVAP. PUMP
screen of the user settings menu allows the
user to define the steering of two evaporator pumps (for this to be
possible a changeable digital output has to be configured for a
second evaporator pump in the service menu).
■
MODE
: used to define which kind of control will be used for the
two evaporator pumps. When automatic rotation is chosen the
offset on running hours also has to be entered.
■
OFFSET ON RH
: used to define the offset in running hours between
the two pumps. Used to switch over between pumps when they
work in automatic rotation mode.
Defining the schedule timer
The
SCHEDULE TIMER
screen of the user settings menu allows the user
to define the schedule timer settings.
■
MON
,
TUE
,
WED
,
THU
,
FRI
,
SAT
and
SUN
: used to define to which
group each day of the week belongs (
-
/
G1
/
G2
/
G3
/
G4
).
■
For each of the four groups up to nine actions can be set, each
with their respective timing. Actions include: putting the unit on/
off, setting a setpoint, setting cooling/heating and setting
capacity limitation.
■
Beside these four groups there is also a holiday period group
which is set the same way as the other groups. Up to 12 holiday
periods can be entered in the
HD PERIOD
screen. During these
periods the schedule timer will follow the settings of the holiday
period group.
Activating or deactivating the setpoints password
The
SETPOINT PASSWORD
screen of the user settings menu allows the
user to activate or deactivate the user password needed to change
the temperature setpoint. When deactivated, the user does not have
to enter the password each time he wants to change the setpoint.
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 enter a lower thermo-
stat step.
■
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 count-
down, the pump keeps running.
To check the actual value of the software timers, proceed as follows:
1
Enter the
TIMERS MENU
through the main menu. (Refer to the
chapter
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
h
key to check the compressor timers (first screen).
The controller shows the actual value of the
COMPRESSOR TIMERS
:
the guard timers (one per compressor) and the antirecycling
timers (one per compressor).
3
Press the
h
key to check the compressor timers (second
screen).
The controller shows the actual value of the
COMPRESSOR TIMERS
:
the guard timers (one per compressor) and the antirecycling
timers (one per compressor).
Tasks of the safeties menu
Listing activated safeties and checking the unit status
If the alarm buzzer is activated and the user presses the
p
key, the
controller automatically enters the safeties menu.
■
The controller will enter the
UNIT SAFETY
screen of the safeties
menu when a unit safety was the cause of shutdown. This
screen provides the following information:
•
the activated safety: emergency stop, flow switch, sensor
error or reverse phase
•
the unit status at the moment of shutdown
inlet water temperature setpoint of the evaporator,
inlet water temperature setpoint of the condenser,
time and date at the moment of shutdown.
■
The controller will enter the
MODULE 1
,
MODULE 2
or
MODULE 3
SAFETY
screen of the safeties menu when a safety of module 1,
respectively module
2 or module
3 was activated. These
screens provide information about the module status at the
moment of shutdown.
•
the activated safety: freeze-up, general safety or sensor error
•
the unit status at the moment of shutdown
inlet water temperature setpoint of the evaporator,
inlet water temperature setpoint of the condenser,
time and date at the moment of shutdown.
1
Press the
p
key when the alarm buzzer is activated.
The appropriate safety screen with the basic information
appears. Press the
q
key to see the detailed information.
2
If more than one kind of safety is active (indicated by means of
W
,
X
or
C
), use the
g
and
h
keys to consult them.
NOTE
A functional diagram showing the schedule timer
working can be found in
.
NOTE
The unit always works with "last command". This
means that the last command given, whether manually
by the user or by the schedule timer, is always
executed.
Examples of command that can be given are switching
the unit on/off or changing a setpoint.
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