Installation and operation manual
20
HXY48TAVJU
VRV System indoor unit
3P616151-1A – 2021.12
Operation example
: Schedule timer based on ON/OFF instruction.
When setback function (refer to "[2] Automatic setback function" on
page 20) is enabled, the setback operation will have priority over the
scheduled action in the schedule timer if ON instruction is active. If
OFF instruction is active this will have priority over the setback
function. At any time the OFF instruction will have the highest priority.
[0-04]
Status: defines whether the ON/OFF instruction can be
used in the schedule timer for cooling.
Same as for [0-03] but for cooling schedule timer.
For cooling, no setback function is available.
[1] Settings are not applicable
[2] 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.
[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
Setback can be configured for both room temperature control and
leaving water temperature control.
Refer to "[5] Automatic setback" on page 21 for temperature set points.
[3] Weather dependent set point (Heating)
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 optional demand PCB.
[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).
1
Schedule timer
2
Setback function
3
When both setback function and schedule timer are enabled
A
Setback function
B
ON/OFF instruction
t
Time
T
Temperature set point
Room temperature
Leaving water temperature
INFORMATION
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.
t
A
5:00
23:00
5:00
23:00
2
B
t
9:00
16:00
1
OFF
ON
ON
6:30
0:30
B
t
6:30
9:00
16:00
23:00
3
OFF
ON
ON
66°F
(19°C)
66°F
(19°C)
72°F (22°C)
70°F
(21°C)
108°F
(42°C)
108°F
(42°C)
113°F (45°C)
111°F
(44°C)
66°F
(19°C)
66°F
(19°C)
72°F (22°C)
70°F
(21°C)
108°F
(42°C)
108°F
(42°C)
113°F (45°C)
111°F
(44°C)
104°F (40°C)
64°F (18°C)
104°F (40°C)
64°F (18°C)
66°F
(19°C)
66°F
(19°C)
72°F (22°C)
70°F
(21°C)
108°F
(42°C)
108°F
(42°C)
113°F (45°C)
111°F
(44°C)
104°F
(40°C)
64°F
(18°C)
66°F
(19°C)
66°F
(19°C)
72°F (22°C)
70°F
(21°C)
108°F
(42°C)
108°F
(42°C)
113°F (45°C)
111°F
(44°C)
104°F
(40°C)
64°F
(18°C)
A
Normal room temperature set point
B
Room setback temperature [5-03]
t
Time
T
Temperature
A
Normal leaving water temperature set point
B
Leaving water setback temperature =A–[5-02]
t
Time
T
Temperature
T
t
Target water temperature
T
A
Ambient (outdoor) temperature
Shift value
= Shift value
[2-01]
[2-02]
A
B
T
t
70°F
(21°C)
64°F
(18°C)
[2-01]
[2-02]
B
A
T
t
113°F
(45°C)
9°F (5°C) [5-02]
104°F
(40°C)
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 20 ページ ２０２１年１２月１４日 火曜日 午後１時２９分
