eta PelletsCompact PC33, Installation Manual

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Serial buffer connection Buffer storage tank
8.6 Serial buffer connection
Serial buffer connection
If there are different buffer types, or if not all buffers can be set up in one group, serial connection of the buffers will
be necessary. Note that for serial buffer connection, integration of a solar heating system will work adequately only
when a fresh water module is used for the hot water supply.
Solar tanks with internal solar exchangers are only of limited effectiveness. Combination tanks with immersed hot
water tanks or internal water heat exchangers are unsuitable for a serial buffer connection. To minimize pipe
circulation losses, it is helpful to make the connections with downward siphon loops.
With fresh water module
1 Fresh water module flow
2 Temperature sensor [Sensor 1 (upper)]
3 Boiler, heating circuits, oil/gas boiler flow
4 Temperature sensor [Sensor 2]
5 Oil/gas boiler return
6 Solar flow
7 Temperature sensor [Sensor 3]
8 Solar return
9 Fresh water module return
10 Temperature sensor [Sensor 4]
11 Boiler and heating circuits return
maximum total output Number of buffers Connecting line, minimum
30 kW 4 DN 25 R 1" 28 x 1.5
50 kW 4 DN32 R 1¼" 35 x 1.5
65 kW 2 DN32 R1¼" 35 x 1.5
80 kW 4 DN 40 R1½" 42 x 1.5