OPERATING LOGICS FOR
OPERATING LOGICS FOR DOMESTIC HOT WATER PRODUCTION In a heat pump cascade system or in a hybrid system with heat pump cascade, the production of domestic hot water can occur in four different ways: / PRODUCTION OF DOMESTIC HOT WATER WITH CASCADE: The domestic hot water production service is guaranteed by a single hot water indirect cylinder. Heating of the hot water indirect cylinder is guaranteed by one or more heat pumps connected hydraulically in parallel with one another, on delivery and return manifolds, by means of a three-way valve. The temperature inside the indirect cylinder is managed by the Cascade Manager through a single temperature sensor. The activation – for heating of the indirect cylinder – of the heat pumps also dedicated to the production of domestic hot water, always occurs simultaneously without the application of cascade logics. During domestic hot water production, the heat pumps dedicated to this service are unavailable for the space heating/cooling service (hot water priority). LB 1 LB 2 ... LB 4 LB 5 Cascade Manager ODU 1 ODU 2 ... ODU 4 ODU 5 AB AB B B A A A B AB (*) (*) (*) To be opened in case of DHW enabled for the related HHP. / PRODUCTION OF DOMESTIC HOT WATER OF THE SINGLE MACHINES: The production of domestic hot water is guaranteed by several - This schematic is for example only and does not replace design by a qualified technician; hot water - indirect The final schematic cylinders must be prepared respecting connected all the laws, norms and decrees in parallel, in force, in order to facilitate which a correct function installation in compliancewith both the rule as of the a art; cold water inlet and a hot water outlet. Each indirect cylinder - For the proper functioning of all system components, follow the instructions in the design, installation and user manuals provided by the manufacturer; - This outline may be amended by the Ariston Group at any time without prior notice. is heated by a single heat pump, connected hydraulically to the indirect cylinder through a dedicated three-way valve; the temperature of SCHEME SCHEME NAME Hydraulic each indirect cylinder is managed EN_021-5xPMC4.PK_HCD-CD1_BUF.4_1D by the relative heat pump, on the basis of its own logics, through a dedicated indirect cylinder sensor. DATE REV. PAGE 02/2023 1 1/5 During domestic hot water production, the heat pumps dedicated to this service are unavailable for the space heating/cooling service (hot water priority). IDU_1 IDU_2 IDU_3 CM Heating/cooling request from the system F F F AB A AB A B B s s | 32
10. CASCADE MANAGER - OPERATING LOGICS / PRODUCTION OF DOMESTIC HOT WATER WITH CASCADE AND WITH BOILER: Domestic hot water production is guaranteed by hot water indirect cylinder, managed by the heat pump cascade and by an indirect cylinder – in series – managed by the boiler. The indirect cylinder managed by the boiler is heated directly by the boiler, according to its own logics, through a dedicated hot water sensor or a thermostat. LB 1 LB 2 ... LB 4 LB 5 Cascade Manager ODU 1 ODU 2 ... ODU 4 ODU 5 AB AB B B A A B AB A (*) (*) A B AB (*) To be opened in case of DHW enabled for the related HHP. / USE OF INTEGRATED - This schematic HEATING is for example only ELEMENTS and does not replace design AND by a qualified ANTI-LEGIONELLA technician; FUNCTION: If the heat pump models used in the cascade are - The final schematic must be prepared respecting all the laws, norms and decrees force, in order to facilitate a correct installation in compliancewith the rule of the art; - For the proper functioning of all system components, follow the instructions the design, installation and user manuals provided by the manufacturer; equipped with an indoor unit with integrated heating elements, it is possible to use heating elements to integrate the production of - This outline may be amended by the Ariston Group at any time without prior notice. SCHEME SCHEME NAME domestic hot water by choosing, for each heat pump, the number of heating elements that can be used and the duration of intervention. Hydraulic EN_032-5xPMC4.PK_HD-BOILER.S_HD-2xCD1_BUF.6_1D DATE REV. PAGE The integrated heating 02/2023 elements 1 can 1/5 also be configured as back-ups and will activate immediately only if all the heat pumps dedicated to domestic hot water production are unavailable. The cascade system has an anti-Legionella function that can be configured on the basis on the specific application needs (frequency of anti-Legionella cycles, times, etc.) If there are integration heating elements, these will be activated in parallel with the heat pumps during the anti-Legionella cycle to guarantee the minimum cycle duration. If there are no integrated heating elements, the correct execution of the anti-Legionella cycle might not be guaranteed by the heat pumps alone. IDU 1 IDU 2 ... IDU 4 IDU 5 Cascade Manager AB B AB B A A ODU 1 (*) (*) ODU 2 ... ODU 4 ODU 5 A B AB (*) To be opened in case of DHW enabled for the related HHP. - This schematic is for example only and does not replace design by a qualified technician; - The final schematic must be prepared respecting all the laws, norms and decrees in force, in order to facilitate a correct installation in compliancewith the rule of the art; - For the proper functioning of all system components, follow the instructions in the design, installation and user manuals provided by the manufacturer; - This outline may be amended by the Ariston Group at any time without prior notice. SCHEME Hydraulic DATE REV. PAGE SCHEME NAME EN_019-5xPCM4.PL.M_HCD-CD1_BUF.4_1D | 33
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