AIR-COOLED LIQUID CHILLERS WITH INTEGRATED HYDRONIC MODULE 30RB 602-802
Remote management (EMM option)
Room temperature: Permits set point reset based on the building indoor air temperature (with Carrier thermostat) Set point reset: Ensures reset of the cooling set point based on a 4-20 mA or 0-5 V signal Demand limit: Permits limitation of the maximum chiller demand based on a 4-20 mA or 0-5 V signal Demand limit 1 and 2: Closing of these contacts limits the maximum chiller capacity to three predeﬁned values User safety: This contact can be used for any customer safety loop, closing of the contact generates a speciﬁc alarm Ice storage end: When ice storage has ﬁnished, this input permits return to the second set point (unoccupied mode) Time schedule override: Closing of this contact cancels the time schedule effects Out of service: This signal indicates that the chiller is completely out of service Chiller capacity: This analogue output (0-10 V) gives an immediate indication of the chiller capacity Compressor operation: This contact signals that one or several compressors are in operation
Units with fans with available pressure for indoor installation (option 12)
This option applies to 30RB units installed inside the building in a plant room. For this type of installation the hot air leaving the air-cooled condensers is discharged by the fans to the outside of the building, using a duct system. 30RB units equipped with fans with available pressure are designed to operate with air discharge ducts with maximum pressure drops of 200 Pa. To compensate for these pressure drops 30RB units with option 12 are equipped with variable-speed fans with a maximum speed of 19 r/s, instead of 15.8 r/s and ﬁxedspeed fans as for the standard units. All fans in the same refrigerant circuit are controlled by a single-speed variator and therefore all run at the same speed. The full-load or part-load speed is controlled by a patented algorithm that permanently optimises the condensing temperature to ensure the best unit energy efﬁciency (EER) whatever the operating conditions and pressure drops of the system ductwork. Each refrigerant circuit (A, B and C) must have a separate ducting system to prevent any air recycling between the condensers of the different refrigerant circuits. In 30RB units with option 12 each fan is equipped with a factory-installed connection interface, allowing the connection to the ducting system for the speciﬁc circuit (A, B and C) for each fan. Please refer to the unit dimensional drawings for the exact dimensions of the connection interface. The unit cooling capacity and energy efﬁciency ratio (EER) vary depending on the duct pressure drops: - Between 0 and 100 Pa the unit cooling capacity is only slightly affected - Between 100 and 200 Pa the unit cooling capacity falls considerably depending on the operating conditions (outdoor air temperature and water conditions). Please refer to the curves below to evaluate the impact of the estimated duct system pressure drop for the installation and the impact of different full load operating conditions on the 30RB unit cooling capacity and EER.
Cooling capacity variations for operating conditions that differ from Eurovent conditions
EER variations for operating conditions that differ from Eurovent conditions