Руководство для технического персонала
31
13.4.1.
Boiler’s operation in heating mode:
1)
The electronic board 11 (see p. 13.1 , page 27) checks the 3 way valve’s position;
2)
If the 3 way valve 18 is in the position , corresponding with the DHW mode, the electronic board
supplies voltage to its electrical motor 19. The electrical motor moves the 3 way valve 18 to the
position for the heating mode . As a result, the heat carrier from the primary heat exchanger will be
directed to the heating system;
3)
The electronic board supplies voltage to the pump 7 (voltage presence on the pump’s terminals can
be checked with a tester).The pump starts operating (the sound of operating pump can be heard);
4)
The electronic board inquires the air pressure switch 1, its contacts must be opened. If the contacts
are closed, the boiler’s launching stops;