Daikin ECB2MUBW Operation Manual Download

Page: 13 / 174

EWWQ049~06 ECB2+3MUBW

Packaged water-cooled water chillers

D-EOMHP01008-17EU

Operation manual

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 (

■

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:

Enter the

TIMERS MENU

through the main menu. (Refer to the

chapter

"Main menu" on page 9

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.

Press the

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).

Press the

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

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

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.

Press the

key when the alarm buzzer is activated.

The appropriate safety screen with the basic information
appears. Press the

key to see the detailed information.

If more than one kind of safety is active (indicated by means of

), use the

and

keys to consult them.

NOTE

A functional diagram showing the schedule timer
working can be found in

"Annex II" on page 17

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.