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9
The gas meter flow rate is capable of ensuring the
simultaneous use of all the appliances connected
to it. The appliance connection to the gas supply
line must be made in accordance with the current
regulations.
9
The intake pressure with the appliance OFF has the
following reference values:
− powered by methane gas: optimal pressure 20
mbar
− powered by LPG: optimal pressure 37 mbar
a
Do not use fuels other than those envisaged, for
any reason whatsoever.
While it is normal for the intake pressure to decrease while
the appliance is operating, it is a good idea to check that
there are no excessive pressure fluctuations. In order to
limit the extent of these variations, the diameter of the
gas supply line must be defined according to the length
and the pressure drops of the line itself, from the meter
to the boiler.
9
If fluctuations in the gas distribution pressure are
encountered, you are advised to install a pressure
stabiliser upstream of the appliance's gas inlet. For
G31 gas supply, all the necessary precautions must
be taken to prevent the fuel gas from freezing in
the event of extremely low outdoor temperatures.
If the gas distribution network contains solid particles,
install a filter on the fuel supply line. When selecting it,
bear in mind that pressure drops due to the filter should
be as low as possible.
9
Once the installation is complete, check that the
joints are perfectly sealed.
Discharging the flue gases
2.12 Electrical wiring
The CONDEXA HPR thermal module leaves the factory ful-
ly wired, and only needs to be connected to the main
power supply and the system components.
9
It is mandatory:
− to use an omnipolar magnetothermal switch, a
line disconnector, complying with CEI-EN stand-
ards (contact opening of at least 3mm)
− to refer to the wiring diagrams in this booklet
when connecting the system components and
carrying out any electrical task.
9
The use of adaptors, multiple sockets and exten-
sions to power the appliance is not allowed.
9
Any work on the electrical system must only be car-
ried out by qualified personnel in compliance with
all legal provisions, paying special attention to the
safety regulations.
GAS 3/4" M
9
The supply cable is not supplied as standard. The
connection to the mains supply must be made us-
ing FROR 3G1.5 type cables (standardised by CEI 20-
27) or the equivalent.
9
Secure the cables with ties to ensure they are cor-
rectly positioned inside the appliance.
9
It is vital that the electricity cables and those for
the low voltage system components (room/heating
request thermostat, outdoor temperature sensors,
etc.) are separated.
9
The installer is responsible for ensuring the appliance
is suitably earthed; the manufacturer will not be
liable for any damage resulting from an incorrect or
absent earth connection.
9
The length of the wires between the cable fixing
point and the terminals must be such that, if the
cable slips out of its fixing point, the live wires are
pulled taut prior to the earthing one. For this rea-
son, the earthing wire must be at least 2 cm longer
than the others.
9
The boiler can work with a phase-neutral or phase-
phase supply.
9
It is also advisable to respect the phase-neutral
connection (L-N).
9
Before connecting any external electrical compo-
nents (regulators, electric valves, climate control
probes, etc.) to the appliance, make sure their
electrical characteristics (voltage, absorption, ac-
celeration current) are compatible with the availa-
ble inputs and outputs.
9
The use of any type of tube for earthing the appli-
ance is forbidden.
a
It is forbidden to pull, detach or twist any electric
cables from the thermal module, even when the
latter is disconnected from the mains supply.
Low voltage connections
Make the low voltage connections as follows:
ƒ use the connectors supplied:
ƒ ModBus 4-pole connector for the BUS 485 signal (- A
B +)
ModBus CE4
connector
27
INSTALLATION
- A B +
CE4
TA
TA
M02
OT+
OT+
SE
SE
TB
TB
SB
SB
}
GND
only for
A
B
cascade
+ (24V)
not used
not used
not used
not used
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