Plum ecoMAX920P2-I, Operation And Installation Manual, Page: 30 / 48

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Diagram with pelet boiler and with heat buffer 5 , where: 1 – pellet boiler, 2 – boiler pump, 3 – HUW circulation
pump, 4 – upper sensor temperature buffer, 5 – center sensor temperature buffer, 6 – lower sensor temperature solar, 7
– water temperature sensor for charging buffer pump solar, 8 – H2/H3 CIRCUIT regulated circuit water temperature
sensor, 9 – H2/H3 circuit pump, 10 – electrical servo of H2/H3 CIRCUIT regulated heat circuit, 11 –solar collector
temperature sensor, 12 – solar, 13 – heat buffer, 14 – solar pump.
PROPOSED SETTINGS:
Parameter Setting MENU
Hydraulic diagram 4 menu  service settings  System
Pump starting temperature 55  C menu  service settings  System
Minimum temperature 60  C menu  service settings  System  Main heat source
Hysteresis heat source 5  C menu  service settings  System  Main heat source
Selection heat source boiler pellet menu  service settings  System  Main heat source
Pump operation extension 5min. menu  service settings  System  Main heat source
Mode ON menu  service settings  Buffer
Selection OFF menu  service settings  System  Additional heat source
Description: The pump (9) starts after exceeding the pump starting temperature. The boiler (1) will switch off after
loading the buffer tank (13). The boiler (1) have to be equipped with security measure against cold water returning to
the boiler e.g. thermostatic 3-way valve. The pump (2) starts together with the boiler (1) and turns off after turning off
the boiler (1), but with 5 min. time delay.
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The hydraulic diagram shown does not replace the central heating system design and is used for illustrative purposes
only!