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English
15.3. Energy saving and optimum operation
This heat recovery system is equipped with advanced energy sav-
ing functionality (VRT). Detecting all connected indoor unit type,
advanced energy saving functionality type is selected automatically.
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.
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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
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It corresponds to the standard operation which is known and can be
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• To activate this operation method under cooling operation:
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• To activate this operation method under heating operation:
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•
Automatic for VRT control
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
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• This operation is selected automatically with checking con-
nected indoor unit type.
E.g., when your system is operating in heating, you do not need as
much heating under high outdoor ambient temperatures (e.g., 68°F
(20°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
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• This operation is selected automatically with checking con-
nected indoor unit type.
•
Hi-sensible
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.
•
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ments of the pre-designed system containing a high sensible
solution.
Value
[2-8]
T
e
target
3
45°F (7°C)
4
46°F (8°C)
5
48°F (9°C)
6
50°F (10°C)
7
52°F (11°C)
•
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ments of the pre-designed system containing a high sensible
solution.
Value
[2-9]
T
c
target
1
106°F (41°C)
3
109°F (43°C)
15.3.2. Several comfort settings are available in VRT control
A comfort level can be set for VRT control mode and hi-sensible mode.
The comfort level is related to the time and power (energy consump-
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The requested conditions are achieved more quickly by temporarily
changing the refrigerant temperature.
•
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
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• To activate the powerful comfort setting under cooling opera-
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• To activate the powerful comfort setting under heating opera-
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•
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.
In case of cooling operation the evaporating temperature is allowed
to go down to 43°F (6°C) on temporary base depending on the
situation.
In case of heating operation the condense temperature is allowed
to go up to 115°F (46°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
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• To activate the quick comfort setting under cooling operation,
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• To activate the quick comfort setting under heating operation,
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