13
8 - CHECKING BEFORE COMMISSIONING
■
It is advisable to use
fl
exible hoses for connecting the piping
to the unit in order to reduce the transmission of vibrations to
the building to the greatest degree. It is mandatory to assemble
hoses if the unit is installed over shock absorbers. Optionally,
a
fl
exible hydraulic connections kit can be supplied.
■
The pipe layouts must be set out with the lowest possible
number of bends to minimise pressure drops. The pipes must
be correctly supported to prevent exerting excessive force on
the unit connections.
■
Before insulating the tubes and charging the system perform
a preliminary check to verify that there are no drops in the
installation.
■
The pipes must be carefully insulated to prevent leaks and
condensation. Ensure that the material used is steam barrier
type. Otherwise, cover the insulation using appropriate
protection.
■
The water must be analysed and the circuit must be set out
according to the results. If necessary, an expert in water
treatment must be consulted (see section on corrosion
behaviour).
■
In installations to open circuits, if it is not possible to
maintain the water conditions within the values indicated in
the corrosion behaviour table featured, it will be necessary
to install an exchanger that separates the unit circuit from
the circuit of the water circuit to be dealt with by using
materials compatible with these characteristics, whether
stainless steel or titanium.
■
Plan the anti-freeze protection for the installation when the
outdoor temperature is low: water with anti-freeze, thermal
insulation of the hydraulic circuit, electrical heaters in the
hydraulic circuit, draining from the installation when the unit
does not work, etc.
In this case the installer must set up the complete hydraulic
circuit with all the components: thermal bu
ff
er tank, motorised
pump group, expansion vessel, safety, regulation, cut-o
ff
and
draining valves, air bleeder valve, etc.
It is also necessary to install a
fi
lter in the hydraulic power
supply to the unit in order to prevent clogging of the plate
exchanger. Non-compliance with this recommendation
can cause reduced
fl
ow which can lead to freezing and
breaking of the exchanger.
Both at the inlet and the outlet of the unit, install thermal
pressure gauges which enable supervising the operation of the
installation, or at least plan the installation of these.
Note: optionally, a kit can be supplied with :
- A stainless steel mesh
fi
lter (500 microns).
- Cut-o
ff
and water regulation valves.
- Flexible hydraulic connections of 500 mm.
Schematic diagram of the hydraulic
circuit
DIFFERENTIAL
PRESSURE SWITCH
PLATES
EXCHARGER
SHUT-OFF
VALVE
DRAINAGE
CIRCUIT
1
2
20
25
3
4
5
6
7
8
10
9
15
2
3
10
15
20
6
7
4
5
8 9
120STD / 160STD
90STD / 100STD
180STD
Flow (m
3
/h)
30PA pressure drop (m.w.c.)
1
2
3
4
5
6
7
8
10
9
15
20
25
2
3
10
15
20
6
7
4
5
8 9
90HEE - 100HEE120HEE - 160HEE - 180HEE
30PA pressure drop (m.w.c.)
Flow (m
3
/h)
Summary of Contents for 30PA 180
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