Ariston 801 Instructions For Installation, Use, Maintenance page 44

If the fault cannot be corrected immediately but it is necessary to
continue operation, an adequate temporary solution shall be used.
This shall be reported to the owner of the equipment so all parties
are advised.
Whenever electrical components must be replaced, the replace-
ments must be suitable for their intended use and comply with the
manufacturer's specifications. Only original spare parts supplied by
the manufacturer are tested and certified for operation with flamma-
ble gases in safe conditions. Observe the maintenance and assis-
tance guidelines in all circumstances.
It is necessary to always observe the manufacturer's maintenance
and assistance guidelines. In case of doubts, ask the manufacturer's
technical department for assistance.
REPAIRING SEALED COMPONENTS
During repairs to sealed components, all electrical supplies shall be
disconnected from the equipment being worked upon prior to any
removal of sealed covers, etc. If it is absolutely necessary to have an
electrical supply to equipment during servicing, then a permanently
operating form of leak detection shall be located at the most critical
point to warn of a potentially hazardous situation.
Particular attention shall be paid to the following to ensure that by
working on electrical components, the casing is not altered in such a
way that the level of protection is affected. This shall include damage
to cables, excessive number of connections, terminals not made to
original specification, damage to seals, incorrect fitting of glands, etc.
Ensure that seals or sealing materials have not degraded to the point
that they no longer serve the purpose of preventing the ingress of
flammable atmospheres. Replacement parts shall be in accordance
with the manufacturer's specifications.
REPAIRING INTRINSICALLY SAFE COMPONENTS
Do not apply any permanent inductive or capacitance loads to the
circuit without ensuring that this will not exceed the permissible volt-
age and current permitted for the equipment in use.
Intrinsically safe components are the only types that can be worked
on while live in the presence of a flammable atmosphere. The test
apparatus shall be at the correct rating.
Replace components only with parts specified by the manufacturer.
Other parts may result in the ignition of refrigerant in the atmosphere
from a leak.
DETECTING REFRIGERANT GAS LEAKS
Under no circumstances shall potential sources of ignition be used in
the searching for or detection of refrigerant leaks. A halide torch (or
any other detector using a naked flame) shall not be used.
Electronic leak detectors may be used to detect refrigerant leaks but,
in the case of flammable refrigerants, the sensitivity may not be ad-
equate, or may need re-calibration.
The methods for detecting leaks specified below are deemed ac-
ceptable for plants containing flammable refrigerants:
• Electronic detectors can be used only if they are suitable for oper-
ating in potentially explosive atmospheres and are able to detect
the R290 gas (propane).
• Make sure that the detector is properly calibrated.
• Leak detection equipment shall be set at a percentage of the LFL
of the refrigerant and shall be calibrated to the refrigerant em-
ployed, and the appropriate percentage of gas (25 % maximum) is
confirmed.
• Leak detection fluids are also suitable for use with most refriger-
ants but the use of detergents containing chlorine shall be avoid-
ed as the chlorine may react with the refrigerant and corrode the
copper pipe-work.
If a leak is suspected, all naked flames shall be removed/extinguished.
No welding or brazing operation is allowed on the cooling circuit, in
the place of installation.
44 / EN
NOTE
Following scheduled or unscheduled maintenance, it is advisable to
fill the appliance tank with water and empty it completely, to remove
any remaining impurities.
Only use original spare parts purchased from technical assistance
centres authorised by the manufacturer to ensure compliance with
(Italian) Ministerial Decree no. 174.
EMPTYING THE APPLIANCE
The appliance must be drained if it will be left inactive for an extend-
ed period of time and/or in a room subject to frost.
When necessary, empty the appliance as follows:
- disconnect the appliance from the power supply in a permanent
manner;
- close the shut-off valve (if installed) or, alternatively, the main tap of
the domestic circuit;
- open the hot water tap (washbasin or bathtub);
- open the tap located on the safety unit (for countries that have
transposed the EN 1487 standard) or the appropriate tap mounted
on the tee fitting, as described in the chapter "Hydraulic connec-
tions".
PERIODIC MAINTENANCE
The evaporator should be cleaned on an annual basis in order to
remove any dust or obstructions. To access the evaporator located
on the outdoor unit, it is necessary to remove the screws fastening
the protective grille.
Clean it using a flexible brush, being careful not to damage the de-
vice. If a fin has been bent, straighten it using a fin comb (1.6 mm
pitch).
Check that the condensate drainage pipe (on the outdoor unit) is not
obstructed. Only use original spare parts.
Following scheduled or unscheduled maintenance, it is advisable to
fill the appliance tank with water and empty it completely, to remove
any remaining impurities.
Regulation for water intended for human consumption:
(Italian) Ministerial Decree no. 174 (and subsequent updates) is a
regulation concerning the materials and objects that can be used in
fixed water harnessing, treatment, supply and distribution systems
for water intended for human consumption. The provisions of this
regulation define the conditions which materials and objects used
in fixed water harnessing, treatment, supply and distribution systems
for water intended for human consumption must fulfil. This product
conforms to (Italian) Ministerial Decree no. 174 (and subsequent up-
dates) concerning the implementation of Directive no. 98/83/EC on
the quality of water intended for human consumption.
ROUTINE MAINTENANCE PERFORMED BY THE USER
It is advisable to rinse out the appliance after every routine or extraor-
dinary maintenance intervention.
The overpressure protection device must be operated regularly to
verify that it is not clogged and to remove any limescale deposits.