Ariston E-COMBI 24 Installation And Servicing Instructions page 35

Draining procedures
The heating system must be drained using the
following procedure:
- Switch off the boiler, make sure the external
bipolar switch is in the OFF position;
- Loosen the automatic air relief valve;
- Open the system drain off cock and collect the
escaping water in a container;
- Empty the water from the lowest points of the
system (where applicable).
If the system is to be left inactive in areas where the
room temperature may fall below 0°C during winter,
we recommend that anti-freeze liquid is added to
the water in the heating system in order to avoid the
need for repeated draining; when this liquid is used
make sure it is compatible with the stainless steel
used for the bodywork of the boiler.
We recommend the use of anti-freeze products
which contain PROPYLENE GLYCOLS as these inhibit
corrosion and that they are used in conjunction with
the anti-scaling and anti-corrosion function, in the
quantities suggested by the manufacturer, at the
mimimum temperature.
Regularly check the pH level of the water/anti-freeze
mix in the boiler circuit and replace it when the value
measured is lower than the limit prescribed by the
manufacturer.
DO NOT MIX DIFFERENT TYPES OF ANTI-FREEZE.
The manufacturer will not be held liable for any
damage caused by the appliance or the system due
to the use of inappropriate anti-freeze substances or
additives.
Draining the domestic hot water system
Every time there is a danger of freezing, the domestic
hot water system must be drained as follows:
- Shut off the water mains inlet valve;
- Open all the hot and cold water taps;
- Empty the water from the lowest points of the
system (where applicable).
WARNING
Before handling, empty all components which may
contain hot water, performing bleeding where
necessary.
Descale the components in accordance with the
instructions provided on the safety data leaflet
supplied with the product used, make sure the room
is well ventilated, wear protective clothing, avoid
mixing different products, and protect the appliance
and surrounding objects.
Seal all openings used to take a gas pressure reading
or to make any gas adjustments.
Make sure that the nozzle is compatible with the
supplied gas.
If a smell of burning is detected or smoke is seen
leaking from the appliance, or there is a smell of gas,
disconnect it from the electricity supply, shut off the
gas valve, open the windows and call for technical
assistance.
Cleaning the primary exchanger
The inside of the primary exchanger is accessed by
removing the burner. Wash with water and deter-
gent using a non-metallic rifle-type brush, rinse with
water.
Cleaning the trap
The trap is accessed by emptying the condensate
bowl located in the bottom section. Wash with
water and detergent.
Replace the condensate collection bowl in its
housing.
NB: In the event of prolonged of the appliance, the
trap must be filled before being used again.
A lack of water in the siphon is dangerous and
may cause exhaust gases to be released into the
atmosphere.
maintenance
35