Installation and operation manual
30
125A7V1B
VRV IV System indoor unit
4P325971-1B – 2012.07
Selecting space heating operation
1
Use the
y
button to switch ON/OFF space heating (
h
).
Icon
h
appears on the display as well as the corresponding
actual room temperature set point.
The operation LED
0
lights up.
2
Use the
bi
and
bj
buttons to set the desired room
temperature.
Temperature range for heating: 16°C~32°C (room temperature)
In order to avoid overheating, space heating is not operable
when the outdoor ambient temperature rises above a certain
temperature (see operation range).
Refer to
"11.3.10. Programming and consulting the schedule
timer" on page 33
for setup of the schedule timer function.
3
Use the
ébi
and
ébj
buttons to select the leaving
water temperature which you want to be used to heat up your
system.
Automatic setback function
Setback function provides the possibility to lower the room
temperature. The setback function can for instance be activated
during the night because the temperature demands during night and
day are not the same.
The setback function is configured through field settings. Refer to the
chapter
"8.3. Field settings" on page 17
for a detailed description how
to set one or more field settings.
[2-00] Status: defines whether the setback function is turned ON
(1) or OFF (0)
[2-01] Start time: time at which setback is started
[2-02] Stop time: time at which setback is stopped
[5-03] Room setback temperature
A
Normal room temperature set point
B
Room setback temperature [5-03]
t
Time
T
Temperature
Leaving water temperature control (default)
In this mode, heating will be activated as required by the water
temperature set point. The set point can be set manually, through the
schedule timer or weather dependent (automatic).
Selecting space heating operation
1
Use the
y
button to switch ON/OFF space heating (
h
).
Icon
h
appears on the display as well as the corresponding
water temperature set point.
The operation LED
0
lights up.
2
Use the
é
bi
and
ébj
buttons to set the desired leaving
water temperature.
Temperature range for heating: 25°C~45°C (leaving water
temperature)
In order to avoid overheating, space heating is not operable
when the outdoor ambient temperature rises above a certain
temperature (see operation range).
Refer to "User interface schedule timer" for setup of the schedule
timer function.
Selecting weather dependent set point operation
When weather dependent operation is active, the leaving water
temperature is determined automatically depending on the outdoor
temperature: colder outdoor temperatures will result in warmer water
and vice versa. The unit has a floating set point. Activating this
operation will result in a lower power consumption than use with a
manually fixed leaving water set point.
During weather dependent operation, the user has the possibility to
shift up or down the target water temperature by a maximum of 5°C.
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.
It is advised to use the weather dependent set point because it
adjusts the water temperature to the actual needs for space heating.
It will prevent the unit from switching too much between thermo ON
operation and thermo OFF operation when using the user interface
room thermostat or external room thermostat.
1
Press the
ba
button 1 time to select weather dependent set
point operation (or 2 times when the user interface room
thermostat function is used).
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
ébi
and
ébj
buttons to set the shift value.
Range for the shift value: –5°C to +5°C
Icon
a
will be displayed as long as the weather dependent set
point operation is enabled.
3
Press the
ba
button to deactivate weather dependent set point
operation.
The
ébi
and
ébj
buttons are used to set the leaving
water temperature.
INFORMATION
When using room temperature control, space heating
operation based on room temperature will have priority
over leaving water control.
Note that it is possible that the leaving water temperature
becomes higher than the set point if the unit is controlled
by room temperature.
INFORMATION
Remark that the
b
icon will be flashing during setback
operation.
By default the setback function is enabled.
The setback function can be combined with the
automatic weather dependent set point operation.
Setback function is an automatic daily scheduled
function.
INFORMATION
While room temperature setback function is active,
leaving water setback operation is also performed.
Pay attention not to set the setback value too low,
especially during colder periods (e.g. winter time). It is
possible that the room temperature can not be
reached (or it will take a much longer time) because of
the big temperature difference.
[2-01]
[2-02]
A
B
T
t
21°C
18°C
NOTICE
When an external room thermostat is installed, the
thermo ON/OFF is determined by the external room
thermostat. The user interface is then operated in the
leaving control mode and is not functioning as a room
thermostat.
The user interface ON/OFF status always has priority
over the external room thermostat!
INFORMATION
During this operation, instead of showing the water
temperature set point, the controller shows the shift value
which can be set by the user.
