19
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Configuration
Installer and user reference guide
137
RYYQ+RYMQ+RXYQ
VRV IV+ heat pump
4P546228-1C – 2021.11
No matter which control is selected, variations on the behaviour of the system are
still possible due to protection controls to keep the unit operating under reliable
conditions. The intentional target, however, is fixed and will be used to obtain the
best balance between energy consumption and comfort, depending on the
application type.
Care should be taken about selection procedures and system setups, especially
when using Hydrobox units. The requested leaving water temperature from the
Hydrobox has priority over this energy saving control, as it is related to the
required water temperature.
19.3.1 Available main operation methods
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 in…
Change…
Cooling operation
[2‑8]=2
Heating operation
[2‑9]=6
Automatic
The refrigerant temperature is set depending on the outdoor ambient conditions.
As such adjusting the refrigerant temperature to match the required load (which is
also related to the outdoor ambient conditions).
E.g., when your system is operating in cooling, you do not need as much cooling
under low outdoor ambient temperatures (e.g., 25°C) as under high outdoor
ambient temperatures (e.g., 35°C). Using this idea, the system automatically starts
increasing its refrigerant temperature, automatically reducing the delivered
capacity and increasing the system's efficiency.
E.g., when your system is operating in heating, you do not need as much heating
under high outdoor ambient temperatures (e.g., 15°C) as under low outdoor
ambient temperatures (e.g., –5°C). Using this idea, the system automatically starts
decreasing its refrigerant temperature, automatically reducing the delivered
capacity and increasing the system's efficiency.
To activate this in…
Change…
Cooling operation
[2‑8]=0 (default)
Heating operation
[2‑9]=0 (default)
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.
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