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15 - MAINTENANCE
Legend to electrical schemes:
6 - High limit supply temperature switch
7 - Supply temperature sensor
9 - Flue gas temperature sensor
10 - High limit fl ue gas temperature fuse
11 - Control board
13 - Ignition electrodes
14 - spark generator
15 - Return temperature sensor
16 - Modulating PWM fan
17 - Back fl ue preventer switch (Flapper valve switch)
19 - Water pressure sensor
20 - Gas valve
22 - Detection electrode
28 - Blocked fl ue pressure switch
29 - Condensate blocked drain switch
32 - Main electrical switch
34 - Display
35 - MODBUS board
41 - CH pump relay
42 - DHW pump relay
47 - Water Flow meter
48 - Motorized valve (optional)
49 - Local pump relay
50 - External reset
RGPR - CH pump relay
RGPS - DHW pump relay
RPP1 - Local pump relay of Burner 1 (Master)
RPP2 - Local pump relay of Burner 2
RPP3 - Local pump relay of Burner 3
RPP4 - Local pump relay of Burner 4
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