Protherm Leopard 24 BOV User And Installation Instructions Manual - Electrical Part
29
Electrical connection of the boiler to the
power grid is by three-wire cord without
plug. The socket for the plug must comply
with the relevant standard and have the
grounding pin connected to a PE or PEN
cable (yellow-green).
The boiler must be connected to the protec-
tive grounding wire; the electrical plug in the
socket must always be accessible without
obstacles. Use of adaptor plugs, exten-
sion cords, etc. is prohibited. The boiler
is protected by tube fuse 125 mA/250V
placed on PCB.
Only a person with adequate electrical-
engineering qualifications can be allowed
to install the socket and the thermostat
(thermostat installation requires utilization
of the boiler’s internal electric cabling); the
same requirements apply to servicing the
electric part. Before any work commences
on the electrical part, the boiler’s cord must
be unplugged.
Only no-voltage thermostats or regulators
can be used for regulating the boiler, i.e.,
they must not bring in any foreign volt-
age.
The minimum requirements for the regula-
tor’s contacts: 24 V / 0.1 A, A.C.
The room thermostat is connected to the
boiler with a two-wire cable, with copper
wires of a recommended cross-section
between 0.5 and 1.5 mm
2
The connecting cables of the room ther-
mostat should not be led parallel to
other cables or through premises with high-
power electric motors (or electric welding
machines., etc.)
The terminal board for connections of the
room thermostat is inside the boiler, on
the bottom. It is accessible after removing
the front cover panel and tilting the control
panel out.
The outdoor temperature sensor is con-
nected to the boiler with a two-core cable
of 0.75 sq.mm cross-section. Maximum
permissible cable resistance may not ex-
ceed 10 Ohms, and the total cable length
10 m.
The terminal box for connecting an outdo-
or sensor and a room control unit is situa-
ted next to the terminal box for connecting
a room control unit.
Electrical part
Electrical connection
fi
g. 22