Maintenance; General Comments; Oprational Test; Draining Procedures - Ariston E-Combi 24 Installation And Servicing Instructions

Important
Maintenance is an essential part of the safe and effi cient operation of
the boiler and ensures its durability. It should be performed according
to the instructions given in current legislation. Perform combustion
analysis regularly in order to check the operating effi ciency of the
boiler and to make sure the combustion is within the boundaries set
by current legislation.
Before beginning maintenance work:
- Disconnect the appliance from the electricity supply by turning
the external bipolar switch to the "OFF" position;
- Remove the fuse;
- Close the gas valve and the central heating and domestic hot
water system valves.
After the work has been completed the initial settings will be restored.

General comments

It is recommended that the following inspections be carried out on the
boiler at least once a year:
1. Check the seals in the water part and, if necessary, replace the
gaskets and restore the seal to perfect working order.
2. Check the seals in the gas part and, if necessary, replace the
gaskets and restore the seal to perfect working order.
3. Visually check the overall condition of the boiler.
4. Visually check the combustion and, if necessary, disassemble and
clean the burner.
5. Following the inspection detailed in point "3", disassemble and
clean the combustion chamber, if necessary.
6. Following the inspection detailed in point "4", disassemble and
clean the burner and injector, if necessary.
7. Cleaning the primary heat exchanger
8. Make sure the following heating safety devices are operating
correctly:
- temperature limit safety device.
9. Make sure that the following gas part safety devices are operating
correctly:
- absence of gas or fl ame safety device (ionisation).
10. Check the effi ciency of the domestic hot water production process
(test the fl ow rate and temperature).
11. Perform a general inspection of the boiler operation.
12. Remove oxide from the detection electrode using an emery cloth.
13. After servicing, complete the relevant Service Interval Record
section of the Benchmark Checklist located on page 54 of this
manual.
14. These checks are not exhaustive. Further mechanical, electrical
and combustion maintenance checks may be required.
15. Analyse combustion, see page 33.
Operational test
After having carried out the maintenance operations, fi ll the heating
circuit at a pressure of approximately 1.5 bar and release the air from
the system.
Fill the domestic hot water system at the same time.
- Begin operating the boiler.
- If necessary, release the air from the heating system again.
- Check the settings and make sure all the command, adjustment and
monitoring parts are working correctly.
- Check the fl ue system is sealed and operating correctly.

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 (E-COMBI)
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 leafl et supplied with the product used, make sure
the room is well ventilated, wear protective clothing, avoid mixing
diff erent 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 detergent using a non-metallic rifl e-type
brush, rinse with water.
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 fi lled
before being used again.
A lack of water in the siphon is dangerous and may cause exhaust
gases to be released into the atmosphere.
Combustion Analyses
Details for fl ue gas analyses can be found on page 33.
Using a suitable calibrated combustion analyser, perform a combus-
tion check. The CO valus can be found on page 33.
2
if the vlues are correct the CO/CO
Where combustion readings cannot be achieved carrefully check items
such as the burner, heat exchanger, fl ue system for defect.
Once satisfactors readings hane been achieved complete the relevant
service interval record selection of the Benchmark Commissioning
Checklist at the rear of this publication.

maintenance

ratio must be less than 0.004.
2
33