Daikin EWAQ005AAV3P, Operation Manual, Page: 5 / 12

EWAQ+EWYQ005~007AAV3P
Packaged air-cooled water chillers and
packaged reversible air to water heat pumps
4PW27338-1 Operation manual
4
Description of the operation modes
Heating operation ( h h h h )
In this mode, heating will be activated as required by the temperature
set point. The set point can be set manually (refer to
"Manual
operation" on page 4 ), automatically (refer to "Automatic operation
(only for heating)" on page 4 ) or according to the defrost demand
from the outdoor unit.
Defrost (
d d d d
)
In heating operation, freezing of the outdoor heat exchanger may
occur due to low outdoor temperature. If this risk occurs, the system
goes into defrost operation. It reverses the cycle and takes heat from
the indoor system to prevent freezing of the outdoor system. After a
maximum of 10 minutes of defrost operation, the system returns to
heating operation.
Cooling operation (
c c c c
)
In this mode, cooling will be activated as required by the temperature
set point.
Silent mode operation (
s s s s
)
Silent mode operation means that the outdoor unit works at reduced
capacity so that the noise produced by the outdoor unit drops. This
implies that the indoor heating and cooling capacity will also drop.
Beware of this when a certain level of heating is required indoors.
Controller operations
Manual operation
In manual operation, the user manually controls the temperature
settings of the installation. The last setting remains active until the
user changes it or until the schedule timer does.
As the controller can be used for a wide variety of installations, it is
possible to select a function which is not available on your
installation. In that case the message
n
will appear.
Selection and setting of cooling (
c c c c
) and heating (
h h h h
)
1 Use the
=
button to select cooling (
c
) or heating (
h
).
Icon c or h appears on the display as well as the corresponding
temperature set point.
2 Use the
bi
and
bj
buttons to set the correct
temperature.
• Temperature range for heating: 30°C to 55°C
• Temperature range for cooling: 7°C to 20°C
Selecting silent mode operation (
s s s s
)
1 Use the
s
button to activate silent mode operation (
s
).
Icon
s
appears on the display.
Displaying temperature values
1 Push the
ba
button for 5 seconds.
The
b
icon and the outgoing water temperature are displayed.
The icons
l
and
=
are flashing.
2 Use the
pi
and
pj
buttons to display:
• The outdoor temperature (
u
icon is flashing).
• The outgoing water temperature (
h
or
c
is flashing).
If no button is pressed for 5 seconds, the controller leaves the
display mode.
Automatic operation (only for heating)
In automatic operation, the controller calculates the heating
temperature set point based on the outdoor temperature.
However, the user can set a "shift value". This shift value is the
temperature difference between the temperature set point calculated
by the controller and the real set point. E.g. a positive shift value
means that the real temperature set point will be higher than the
calculated set point.
Selecting automatic operation
1 Press the
ba
button to select automatic operation.
Icon a appears on the display as well as the shift value. The
shift value is not shown in case it is 0.
2 Use the bi and bj buttons to set the shift value.
Range for the shift value: –5°C to +5°C.
Schedule timer operation
In schedule timer operation, the installation is controlled by the
schedule timer. The actions programmed in the schedule timer will be
executed automatically.
The schedule timer always follows the last command until a new
command is given. This means that the user can temporarily overrule
the last executed programmed command by manual operation (Refer
to
"Manual operation" on page 4 ). The schedule timer will regain
control over the installation as soon as the next programmed
command of the schedule timer occurs.
NOTE Defrosting stops:
■
when switching between cooling and heating,
■
at a low outdoor temperature and a low
temperature of the incoming water,
■
when the desired defrost temperature is reached,
i.e. defrost stop temperature (contact your local
Daikin dealer).
Defrost operation restarts automatically when the
water temperature is above the defrost stop
temperature.
NOTE Heating operation is not possible if the installation is a
"cooling only" installation.
NOTE
■
The cooling temperature set point can only be set
manually (refer to
"Manual operation" on page 4 ).
■
Switching between heating and cooling operation
can only be done by pressing the
=
button
(provided the unit is not a "cooling only" unit).
NOTE
The installer may have limited the above mentioned
default ranges at initial installation of the unit.