The system essentially consists of a primary circuit which includes:

·       Condensing boiler

·       Monobloc heat pump

·       Hydraulic separator

·       Inertial storage on the return line to the heat pump

·       Antifreeze devices to protect the monobloc heat pump

·       Water treatment devices (dirt separator) for the protection of generators and, more generally, all system components

·       System charging unit with pressure reducing valve and backflow preventer

The buffer tank is only connected to the heat pump branch, in this case on the return line, and acts as a hot water or chilled water tank depending on the operating mode.

A secondary circuit consists of:

·       Central unit manifold

·       Direct booster unit

·       Motorised regulating and booster unit

This solution is generally used in the following cases:

·       Renovation: adding a heat pump to an existing system with wall-mounted boiler

·       New systems using non-integrated generators

The layout is optimised for a system which runs in both heating and cooling phases. 

 Instantaneous hot water production simplifies system configuration but should be assessed according to specific needs.

There are multiple advantages to this solution. 

·       No space is required for a domestic hot water storage tank. 

·       In winter, the heating function can be carried out by the HP while the boiler is producing DHW. 

·       In summer, the heat pump only produces chilled water and never has to reverse the cooling cycle to produce DHW. Instantaneous DHW production eliminates conditions for the development of Legionella bacteria because hot water is produced only when needed. This dispenses with the need for thermal disinfection of the distribution network.

Note:
The control, expansion and safety equipment must be of appropriate size to reflect the heating capacity and specific characteristics of the system, in accordance with applicable laws and regulations.