Beretta Power Plus Box 150, Руководство по установке, Страница: 33 / 60

33
EMPTYING THE HEATING ELEMENT
- Close the diverting valve (1) and the return tap (2) for
the heating element
- connect a plastic pipe to the heating element's drain
tap (5) and open it
b
Before opening the drain tap (5) protect the underly-
ing electric devices from the existing water
1
2
5
SYSTEM EMPTYING
- Connect a plastic pipe to the drain tap (6) located on
the system return line
- connect a plastic pipe to the diverting valves (1) for
each heating element
- open the return tap (2)
- open the drain tap (6) and the diverting valves (1).
4
6
2 14 Preparing for initial startup
Before igniting the
Power Plus Box
modular system and
performing a functional check, it is important to first check
that:
- the heating system shut-off and gas taps are open
- the type of gas and the supply pressure comply with
the features of the modular system
- the hydraulic circuit pressure, when cold, is approx.
1.5 bar
and the circuit has been deaerated
- the system expansion tank preload is sufficient
- the electric connections have been made correctly
b
It is mandatory to connect the circulators using con-
tactors with manual emergency actuation.
- make sure that the bleed valve cap(s) have been un-
screwed
- the circulators can rotate freely: unscrew the inspec-
tion screw and use a flat screwdriver to check that the
main shaft moves without obstructions
b
Before loosening or removing the circulator cap, pro-
tect the electric devices located underneath from any
water that exits.
- the combustion product evacuation lines have been
suitably implemented.