5.4 Circulation pump
We recommend building a forced water circulation
system accompanied with a sufficient pump. Refer to
the system diagrams given further in this manual to find
the right position of the pump within the hydraulic
circuit. Your boiler automatically switches the pump on
and off according the program stored in its PCB. That
is why circulation pump must be driven by the control
panel. Wiring to the pump is supplied at the back of the
boiler.
On S/X-PACK models, circulation pump is integrated inside the boiler cabinet together
with an expansion tank (10 liters) and a 3 bar safety valve which is outboard the rear
panel. Please see the following sketch for S/X-PACK model accesories:
1
Expansion tank
4
Boiler return pipe for S/ X-PACK model
2
Boiler main controller (PCB)
5
Safety valve
3
Circulation pump
6
Filling/draining port for S/X-PACK model
5.5 Rules for hydraulic circuit
Cortina boiler can be installed in a pressurized heating circuit with addition of a closed
expension tank in respect with one of the following schemes. If heat demand of building
differs from the nominal capacity of boiler, we recommend a buffer tank between primary
circuit and heating installation. Hydraulic circuit should have at least the equipments listed
below:
P1
Primary circuit pump / return (boiler protection line) pump
8
Radiator
P2
DHW circuit pump / 3-way diverter valve
9
Expansion tank
P3
Secondary circuit pump
10
Air relief valve
P2-3
Mixing valve
12
Buffer tank
