EKHVWQ0 E260AA1V3
Domestic hot water heat pump
4PW65343-1A – 10.2010
Operation manual
8
Other operation modes
Defrost (
d
)
In heat pump domestic water heating operation, freezing of the air
heat exchanger may occur due to low ambient temperature. If this
risk occurs, the system goes into defrost operation. It takes heat from
the compressor to undo freezing of the heat exchanger. After a
maximum of 20 minutes of defrost operation, the system returns to
domestic water heating operation.
Powerful domestic water heating operation (
P
)
In the case of urgent need of domestic hot water and no hot water is
left in the domestic hot water tank, the domestic hot water
temperature set point can be reached quickly by pressing the
powerful button. The domestic water will be heating up to the set
point temperature fixed in the field setting. During operation in this
mode the
w
icon will be blinking with 0.2 seconds interval.
Powerful operation can only be set when the system is in ON mode.
When the system is in OFF mode and the powerful button (
P
) is
pressed, the message "
n
" will be dispayed.
Depending on field setting, the powerful operation will be done by the
heat pump alone or in combination with the booster heater (refer to
the installation manual).
Selecting powerful domestic water heating operation
1
Press
P
to activate powerful domestic water heating operation.
Icon
w
start flashing rapidly.
Powerful domestic water heating is deactivated automatically
when the powerful set point fixed in field setting is reached.
It can also be de-activated manually by pressing the powerful button
again.
Quiet mode operation (
s
)
Quiet mode operation means that the unit works at reduced capacity
so that the sound produced by the unit drops. This implies that the
domestic water heating capacity will drop. Beware of this when a
certain level of heating is required.
Selecting quiet mode operation
1
Use the
s
button to activate quiet mode operation.
The
s
icon displays.
If the controller is set to permission level 3 (refer to "Field
settings" in the installation manual), the
s
button is not
operable.
2
Press the
s
button again to deactivate quiet mode operation.
The
s
icon disappears.
There are 3 different levels of quiet mode operation. The desired
quiet mode is set through a field setting. Refer to the field settings
explained in the installation manual for a detailed description how to
set one or more field settings.
Disinfection operation
This mode will disinfect the domestic hot water tank by periodically
heating the domestic water to a specific temperature. During the
operation of this mode the
w
icon will be blinking slowly with
0.5 second intervals.
The disinfection temperature set point can be adjusted by field setting
[0-01].
Reheat
This feature is only valid in schedule timer mode.
Reheat will prevent the domestic hot water from cooling down lower
than a certain temperature. When enabled the unit will deliver hot
water to the domestic hot water tank when the reheat minimum value
is reached (taking into account the heat pump ON differential). The
domestic water heating will continue until the reheat maximum
temperature is reached.
Selecting reheat operation for domestic water heating
1
Make sure the schedule timer is ON.
2
In field setting [0-04] put the reheat function ON.
The reheat minimum and reheat maximum temperature set points
are field settings. Refer to the chapter "Field settings" on page 13 for
a detailed description how to set one or more field settings.
■
[0-02]
Set point: reheat minimum temperature (refer to the figure
in "Domestic water heating modes" on page 14).
■
[0-03]
Set point: reheat maximum temperature (refer to the
figure in "Domestic water heating modes" on page 14).
INFORMATION
The unit increases the domestic hot water temperature
using the indoor stored heat.
The powerful mode might not function properly when the
room ambient temperature is too low.
The system can not operate in powerful operation mode
when user permission level 3 is selected. Refer to the
installation manual.
INFORMATION
When powerful operation mode priority is enabled (refer to
"Feld settings" in the installation manual) and powerful
operation mode is active, the quiet operation mode is
suspended and will not operate. Any attempt to activate
the quiet operation mode by pressing the quiet mode
button (
S
) will result in a "
n
" message.
INFORMATION
■
Remark that the
w
icon will only be blinking during
effective operation.
■
The disinfection function is enabled by default.
■
The disinfection mode can also be active during OFF
mode (refer to "Field settings" in the installation
manual).
INFORMATION
The disinfection set point must be set according to local
and national regulations
