Energy Saving And Optimum Operation - Daikin REYQ72TTJU Installation Manual

[2-35]= Height difference setting
Default value=1.
In case the outdoor unit is installed in the lowest position
(indoor units are installed on a higher position than outdoor
units) and the height difference between the highest indoor
unit and the outdoor unit exceeds 130 ft. (40 m), the setting
[2-35] should be changed to 0.
Other changes/limitations to the circuit apply, for more
information see 7.5. System piping (length) limitations on
page 11.
[2-45]= Year round cooling (outdoor temp. –4°F (–20°C)) setting
Default value=0.
In case of operating cooling mode in the outdoor tempera-
ture 23°F (–5°C) or below, the setting [2-45] should be
changed to 1.
This setting is not applicable to BS unit (multi type).
[2-47]= T target temperature during heat recovery operation
e
Default value=0.
Value
[2-47]
0
2
3
4
5
6
7
Change [2-47]=0, 2-7 in function of required operation
method during cooling.
For more information and advice about the impact of these
settings, see 15.3. Energy saving and optimum operation.
[2-49]= Height difference setting
Default value=0.
In case the outdoor unit is installed in the highest position
(indoor units are installed on a lower position than outdoor
units) and the height difference between the lowest indoor
unit and the outdoor unit exceeds 164 ft. (50 m), the setting
[2-49] has to be changed to 1.
Other changes/limitations to the circuit apply, for more
information see 7.5. System piping (length) limitations on
page 11.
[2-81]= Cooling comfort setting
Default value=1.
Value
[2-81]
0
1
2
3
Change [2-81]=0, 1, 2 or 3 in function of required limitation.
This setting is used in conjunction with setting [2-8] and
[2-47].
For more information and advice about the impact of these
settings, see 15.3. Energy saving and optimum operation.
3P362438-3H English
T target
e
Auto (default)
43°F (6°C)
45°F (7°C)
46°F (8°C)
48°F (9°C)
50°F (10°C)
52°F (11°C)
Cooling comfort setting
Eco
Mild (default)
Quick
Powerful
[2-82]= Heating comfort setting
Default value=1.
Value
[2-82]
0
1
2
3
Change [2-82]=0, 1, 2 or 3 in function of required limitation.
This setting is used in conjunction with setting [2-9].
For more information and advice about the impact of these
settings, see 15.3. Energy saving and optimum operation.

15 .3 . Energy saving and optimum operation

This VRV IV heat recovery system is equipped with advanced energy
saving functionality. Depending on the priority, emphasizes can be
put on energy saving or comfort level. Several parameters can be se-
lected, resulting in the optimal balance between energy consumption
and comfort for the particular application.
Several patterns are available and explained below. Modify the pa-
rameters to the needs of your building and to realize the best balance
between energy consumption and comfort.
15 .3 . 1 . Three main operation methods are available:
• Basic
The refrigerant temperature is fixed independent from the situation.
It corresponds to the standard operation which is known and can be
expected from/under previous VRV systems:
• To activate this operation method under cooling operation:
change field setting [2-8]=2 and [2-47]=2.
• To activate this operation method under heating operation:
change field setting [2-9]=6.
• Automatic
The refrigerant temperature is set depending on the outdoor ambi-
ent conditions. As such adjusting the refrigerant temperature to
match the required load (which is also related to the outdoor ambi-
ent conditions).
E.g., when your system is operating in cooling, you do not need as
much cooling under low outdoor ambient temperatures (e.g., 77°F
(25°C)) as under high outdoor ambient temperatures (e.g., 95°F
(35°C)).
Using this idea, the system automatically starts increasing its refrig-
erant temperature, automatically reducing the delivered capacity
and increasing the system's efficiency.
• To activate this operation method under cooling operation:
change field setting [2-8]=0 (default) and [2-47]=0 (default).
E.g., when your system is operating in heating, you do not need as
much heating under high outdoor ambient temperatures (e.g., 59°F
(15°C)) as under low outdoor ambient temperatures (e.g., 23°F
(–5°C)).
Using this idea, the system automatically starts decreasing its re-
frigerant temperature, automatically reducing the delivered capacity
and increasing the system's efficiency.
• To activate this operation method under heating operation:
change field setting [2-9]=0 (default).
Heating comfort setting
Eco
Mild (default)
Quick
Powerful
36