Energy Saving And Optimum Operation - Daikin VRV IV Manuel D'installation

15 .3 . Energy saving and optimum operation

RXYQ-T units are equipped with advanced energy saving function-
ality. Depending on the priority, emphasizes can be put on energy
saving or comfort level. Several parameters can be selected, 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).
37
• Hi-sensible/economic (cooling/heating)
The refrigerant temperature is set higher/lower (cooling/heating)
compared to basic operation. The focus under high sensible mode
is comfort feeling for the customer.
The selection method of indoor units is important and has to be
considered as the available capacity is not the same as under basic
operation. For details concerning to Hi-sensible applications, please
contact your dealer.
• To activate this setting under cooling operation: change field
setting [2-8] and [2-47] to the appropriate value, matching the
requirements of the pre-designed system containing a high
sensible solution.
Value
[2-8] and [2-47]
3
4
5
6
7
• To activate this setting under heating operation: change field
setting [2-9] to the appropriate value, matching the require-
ments of the pre-designed system containing a high sensible
solution.
Value
[2-9]
1
3
15 .3 .2 . Several comfort settings are available
For each of above modes a comfort level can be selected. The comfort
level is related to the timing and the effort (energy consumption) which
is put in achieving a certain room temperature by temporarily chang-
ing the refrigerant temperature to different values in order to achieve
requested conditions more quickly.
• Powerful
Overshoot (during heating operation) or undershoot (during cooling
operation) is allowed compared to the requested refrigerant tem-
perature, in order to achieve the required room temperature very
fast. The overshoot is allowed from the start up moment.
In case of cooling operation the evaporating temperature is allowed
to go down to 37°F (3°C) on temporary base depending on the
situation.
In case of heating operation the condense temperature is allowed
to go up to 120°F (49°C) on temporary base depending on the situ-
ation.
When the request from the indoor units becomes more moderate,
the system will eventually go to the steady state condition which is
defined by the operation method above.
• To activate the powerful comfort setting under cooling opera-
tion, change field setting [2-81]=3.
This setting is used in conjunction with setting [2-8] and [2-47].
• To activate the powerful comfort setting under heating opera-
tion, change field setting [2-82]=3.
This setting is used in conjunction with setting [2-9].
• Quick
Overshoot (during heating operation) or undershoot (during cooling
operation) is allowed compared to the requested refrigerant tem-
perature, in order to achieve the required room temperature very
fast. The overshoot is allowed from the start up moment.
T target
e
45°F (7°C)
46°F (8°C)
48°F (9°C)
50°F (10°C)
52°F (11°C)
T target
c
106°F (41°C)
109°F (43°C)
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