Installation and operation manual
30
HXY48TAVJU
VRV System indoor unit
3P616151-1A – 2021.12
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: 77~113°F (25~45°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 9°F
(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 third party room thermostat (requires demand
PCB kit).
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: –9°F to +9°F (–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.
Field settings define the parameters for the weather dependent
operation of the unit. Refer to the chapter "8.3. Field settings" on
page 18 for a detailed description how to set one or more field
settings.
T
t
Target water temperature
T
A
Ambient (outdoor) temperature
Shift value
Shift value
[3-00] Low ambient temperature (Lo_A): low outdoor
temperature.
[3-01] High ambient temperature (Hi_A): high outdoor
temperature.
[3-02] Set point at low ambient temperature (Lo_Ti): the target
outgoing water temperature when the outdoor temperature
equals or drops below the low ambient temperature (Lo_A).
Note that the Lo_Ti value should be higher than Hi_Ti, as for
colder outdoor temperatures (i.e. Lo_A) warmer water is
required.
[3-03] Set point at high ambient temperature (Hi_Ti): the target
outgoing water temperature when the outdoor temperature
equals or rises above the high ambient temperature (Hi_A).
Note that the Hi_Ti value should be lower than Lo_Ti, as for
warmer outdoor temperatures (i.e. Hi_A) less warm water
suffices.
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.
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.
NOTE
When an optional demand PCB is installed, the
thermo ON/OFF is determined by the optional
demand PCB. 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 optional demand PCB!
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.
INFORMATION
If by mistake the value of [3-03] is set higher than the value
of [3-02], the value of [3-03] will always be used.
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.
Lo_Ti
Lo_A
Hi_A
T
A
T
t
+ 9°F
(5°C)
00
– 9°F
(–5°C)
Hi_Ti
Shift value
01_EN_3P616151-1A.fm 30 ページ ２０２１年１２月１４日 火曜日 午後１時２９分