Hydraulic Circuit; Operation; Heat Exchanger - Immergas Super CAESAR Manual

Technical Documentation

Hydraulic circuit.

The hydraulic circuit with relevant control and safety devices
is engaged every time there is a request for domestic hot
water.

Operation.

Drawing at least 2.5 l/min of domestic hot water means a
flow of cold water inside the flow meter (13) and consequent
enabling of operation.
Following this, the adjustment circuit ignites the burner.
This way the heat generated by the flame and contained in the
fumes produced by combustion is absorbed by the copper fins
of the water-gas exchanger (3) which in turn transfers the heat
to the water flowing inside.

Heat exchanger (1).

This is a water-gas exchanger (1) with pipes and fins in cop-
per at the exit of which is positioned the overheating safety
thermostat (2).
It is of the so-called "wet chamber" type because the lower part
(3) around which is wrapped the hot water outlet pipe (4),
represents in fact the combustion chamber.
NOTE: to maintain the characteristics of efficiency of the
exchanger, we recommend installing a "anti-scale" kit if the
water is hard and scale deposits on the pipes (recommended
when water hardness exceeds 25 French degrees).
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Safety devices and controls.
Flow meter (1).
This is a rotating magnetic sensor fitted at the cold water flow
inlet.
By means of a three-pole connector (2) it is electrically con-
nected to the adjustment board, allowing this to measure the
flow of water to determine minimum ignition value (2.5 l/min)
and optimise temperature adjustment. A 12 l/min flow limiter
(3) is fitted at the flow meter outlet (1).
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10 bar safety valve unit (1).
It prevents safety pressure (10 bar) being exceeded in the hy-
draulic circuit of the water heater.
It is connected to the cold water inlet pipe and located at the
exchanger inlet.
A one-way valve is fitted inside that prevents the return of hot
water towards the water supply pipeline.
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Technical Documentation
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Super CAESAR