Operation - Immergas ZEUS kW Export Technical Documentation Manual

Technical Documentation
Primary circuit (boiler circuit).
The primary circuit (and its relative control and safety devices)
is enabled every time there is a heating or DHW request.

Operation.

The heat in combustion exhaust is transferred by copper fins
to the water-gas exchanger (8). The water-gas exchanger then
transfers such heat to the water circulating inside it thanks to
the boiler pump (16).
The water is then pushed directly into the system or it can be
diverted to the storage tank coil (2).
This depends on the position of the electric 3-way valve (19)
which, according to the type of request, either allows water to
flow through the central heating flow system (M) and return
(R) pipes or diverts the water towards the coil (2).
Flow rate - head graph.
The shape of the curve representing the flow rate-head ratio
will depend on how the system by-pass is adjusted; thus, the
position of the by-pass will provide more or less head to the
system. The graph below illustrates the characteristic curves
according to the by-pass adjustment.
ZEUS 24 kW
A
ZEUS 28 kW
A
A = Head available to the system at third pump speed (screw is tight-
ened 1.5 turns from loose position)
B = Head available to the system at second pump speed (screw is tight-
ened 1.5 turns from loose position)
STZkW ed 10/07
B
Flow rate in Liter/h
B
Flow rate in Liter/h
Technical Documentation
Boiler pump (1).
The boiler pump operates on the primary circuit return, im-
mediately downstream of the 3-way valve which is connected
to. It is part of the integrated multi-function group made out
of composite material.
The automatic vent valve (2) is also housed in the hydraulic
group casing.
2
1
Primary heat exchanger (1).
The primary heat exchanger is a lamellar water-gas heat ex-
changer with copper pipes and fins (No. 77 fins on the 24 kW
boiler exchanger model and 89 fins on the 28 kW version). The
NTC central heating flow probe (2) and the safety thermostat
(3) are positioned on its outlet pipe (flow).
Primary heat exchanger is assembled with four tubes connected
in series (4).
Pipes with threaded fittings connect it to the pump flow and
the primary circuit flow.
1
6
2 3
4
Flow
Return
ZEUS kW Export