41
2.7 CIRCULATION PUMP
The boiler is supplied, as standard, with a built-in circulator with high energy efficiency, already compliant with
Regulation 641/2009/EU.
The pump is directly managed by the PCB of the boiler and has an automatic operation: it is set for the most suitable
operation based on the measured temperature difference between flow and return.
In the lower diagram are shown the specific curve of the pump and the losses of the heat exchanger:
Secondary circulating pump
In specific applications, due to the high losses in the system, the free head
of the circulation pump may be poor or insufficient for the correct circulation
of water in the heating circuit. For this purpose an optional accessory is
available to connect a secondary pump external to the boiler. The operation
of the secondary pump is managed, quite simply, like the operation of
the primary pump: the pump is activated during the heating phases,
when antifreeze protection is required, and when the initial functional test
(deaeration cycle) is performed.
The characteristics of a compatible supplementary pump are:
Voltage: 230V AC, 50Hz
Amperage: <1 A
Inrush current: <1.5 A
(pumps with special and different technical charachteristics may cause the
improper functioning of the boiler and damage the PCB).
Installation:
•
unplug the boiler;
•
install the pump into the CH system;
•
connect the pump wire to the blue CN5 connector on the PCB;
•
remove the connector from the free end of the wire and join it to the
pump following the electrical scheme on the right side;
•
the installation of a 3Amp fuse is recommended.
0
100
200
300
400
500
600
700
800
0
200
400
600
800
1000
1200
Head
[m
ba
r]
Flow rate [ l/ h]
Head Z34
Head Z25/Z29
Losses Z34
Losses Z25/Z29
CN5 (blue) port
Main electric board
Electrical connection of the secondary pump
Secondary
pump
(L)
3A fuse
(N)
(Ground)
Blue (L)
PCB
CN5
Cut the connector
and join the wires
Black (N)
Yellow/Green(Ground)
Secondary
pump*
System connection
* = it is possible to connect only one secondary pump