64
Monobloc Outdoor Unit Installation Manual
When Cooling mode is selected, the chiller or heat pump will operate in the Cooling mode in order to cool the
water loop to the selected temperature.
When the heat pump is in Heating mode, the heat pump heats the water loop to the selected temperature. When
the outdoor air temperature is very low, electric heaters or boiler heating can be used in order to satisfy the
heating demand. When DHW only is requested, the unit is not allowed to operate in cooling or heating modes. It is
also possible for the unit to operate in DHW mode when heating mode or cooling mode is selected, according to
schedule / temperature condition / maximum runtime.
When the system is in the Off mode, the compressor and the pump are stopped (except for home anti-freeze
protection and water freeze protection, refer to Home anti-freeze protection (Section 10.5) and Water freeze
protection (section 10.6)).
Operating mode control:
The operating mode selection may differ depending on access level and the use of communication methods, i.e.
RC display or JBus / ModBus communication.
In the following sections of this document, the configuration steps are the same for all of these three
communication methods, except when the configuration is described with RC direct access.
i) RC control:
When the RC has been connected to the unit, the mode selection can be done by direct access on RC. When
the unit is Off, press the
Mode
key to wake up the user interface and then press the
Mode
key successively
to select the required operating mode.
ii) Jbus / ModBus communication:
The unit can be started or stopped and its System Mode can be selected from the JBus or ModBus network.
Refer to JBus registers in Parameter setting (section 8.3).
10.3 Setpoint:
Depending on the unit configuration, the system control can be based on either water or air setpoint control.
To achieve better comfort, it is possible to adjust the room temperature setpoint (remote user interface) or water
temperature setpoint according to your needs. Please note that the temperature setpoint can be adjusted only
within a range defined for each occupancy mode.
The water setpoint calculation can be based on:
1. Predefined Climatic Curves
depending on OAT: climatic curves already preconfigured in the control logic.
2. Fixed Water Setpoint:
using a fixed value for each occupancy mode.
3. Custom Climatic Curve
depending on OAT: define customised climatic curves in function of the
application.
4. Offset on climatic curves
(predefined and customer)
