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5.6. Simultaneous demand of space heating and
domestic water heating
The unit can not perform domestic water heating and space heating
at the same time. If both modes are requested at the same time, the
unit will heat up till the reheat maximum temperature in 1 time. During
this period, space heating is not possible.
I
If you are using the remote controller room temperature control:
When the reheat temperature is reached, the further heat up of
the domestic hot water tank will be decided by the remote
controller room thermostat in order to prevent the room
temperature to drop too much.
I
If you are using the external room thermostat:
When the reheat temperature is reached, the further heat up of
the domestic hot water tank will be decided by the external room
thermostat thermo conditions and running timers which are
programmed by your installer.
I
If you are using the remote controller leaving water temperature
control:
When the reheat temperature is reached, the further heating up
of the domestic hot water tank will be decided by the running
timers which are programmed by your installer.
T
A
B
A
Storage temperature
B
Reheat maximum temperature
t
Time
T
Domestic hot water storage temperature
5.7. Temperature read-out mode
On the remote controller, the actual temperatures can be displayed.
1
Push and hold the
button for 5 seconds.
The heating/cooling leaving water temperature is displayed
(icons
and
and
2
Use the
and
I The entering water temperature (icons
blinking and the
icon is flashing slowly).
I The indoor temperature (icons
I The outdoor temperature (icons
I The hot water supply tank temperature (icons
blinking).
3
Push the
button again to leave this mode. If no button is
pressed, the remote controller leaves the display mode after 10
seconds.
Operation manual
11
t
are blinking).
buttons to display:
and
and
are blinking).
and
are blinking).
and
5.8. 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 is enabled (
not displayed) by pressing the
Space heating
Refer to
"Programming space heating" on page
4 actions per day of the week can be programmed, totalling 28
actions.
The space heating schedule timer can be programmed in 2 different
ways: based on the temperature set point (both leaving water
temperature and room temperature) and based on the ON/OFF
instruction.
The desired method is set through field setting. Refer to
settings" on page 18
field settings.
I
[0-03] Status: defines whether ON/OFF instruction can be used
in the schedule timer for space heating.
INFORMATION
By default space heating based on temperature set point
(method 1) is enabled, so only temperature shifts are
possible (no ON/OFF instruction).
Advantage of this method is that you can simply switch off
the space heating operation by pushing the
without disabling the automatic domestic hot water storage
operation (e.g. during summertime when no space heating
is required).
In the following tables both methods on how to interpret the schedule
timer are shown.
Method 1
[0-03]=1 (default)
Space heating based on temperature set point
During operation
During schedule timer operation the operation LED is lit
continuously.
When pushing
The schedule timer for space heating will stop and will
the
button
not start again.
The controller will be switched off (operation LED will
stop working).
However, the schedule timer icon will stay displayed
which means that the domestic water heating stays
enabled.
are
When pushing
The schedule timer for space heating and domestic
the
/
button
water heating along with the quiet mode will be stopped
and will not start again.
The schedule timer icon will not be displayed anymore.
(a) For leaving water temperature and/or room temperature
are
icon displayed) or disabled (
button.
14.
for a detailed description how to set one or more
VRV IV system indoor unit
icon
"5.12. Field
button
(a)
HXHD125A8V1B
4P404572-1 – 2015.04
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