Specifications

12 VEDEX 3300
For the Installer
Electrical installation
Connection
The boiler must be connected under the supervision of an
authorised electrician. The connection cable for electrical
connection is on the reverse of the boiler. There is a con-
nection area for electrical connection behind the front
panel (33).
The charge pump is powered from the electrical socket on
the reverse of the boiler, max. total current output is 10 A.
Min cable area 1.5 mm
2
.
Electrical function
Switch (45) set to position ”0” means that the boiler is off.
Position ”1” is the normal operating position.
The flue gas thermostat (2) controls the boiler fan, and, at
reconnection, also the charge pump.
Electrical circuit diagram
Electrical installation
Laddpump
Max. thermostat (3) only controls the boiler’s fan and
charge thermostat (19) only controls the external charge
pump.
When the green light comes on, the flue gas thermostat’s
set temperature has been reached.
Reconnection
The thermostat is delivered connected for charge control
by thermal valve. i.e. the flue gas thermostat only starts
and stops the flue gas fan.
To prevent stationary losses via VEDEX 3300, reconnection
to charge control without thermal valve is recommended.
The flue gas thermostat, together with the boiler thermo-
stat, then starts and stops the charge pump.
Reconnection must be carried out when docking to ther-
mal outlet. Carry out reconnection by moving cable 09
from terminal 12 to terminal 11 on terminal block -X9.
Charge pump