Ariston FWS Installation Et Mode D'emploi page 40

GB
maintenance
Precautions
Failure to comply with these precautions
may result in serious damage to objects
and plants or harm to animals.
When effecting maintenance on the device,
use appropriate manual tools and equip-
ment; in particular, make sure that the
grips are intact and correctly secured.
Make sure that any electrical devices used
are appropriate for the intended use; in
particular, make sure that the power sup-
ply cable is intact and that the plug is cor-
rectly secured.
Moreover, make sure that the path of the
cable is not impeded.
Descale the components, in accordance
with the instructions provided in the safety
data sheet of the product used. Provide
adequate ventilation in the room, wear
protective clothing, avoid mixing different
products, and protect the device and sur-
rounding objects.
Before performing any work on the de-
vice, shut off the power supply using the
external switch, since the zone module is
always powered. To ensure the safety and
correct operation of the module, the latter
must be started-up by a legally qualifi ed
and authorised technician.
Routine maintenance
The entire sanitary water system - includ-
ing the module - must be checked for pre-
cautionary reasons once a year.
It is important to check the following:
- All the threaded or welded fi ttings of the
system.
- Presence of evident limescale deposits.
The presence of limescale on the plate heat
exchanger reduces the system's effi ciency,
thus it is important to verify that the follow-
ing conditions do not occur:
- Return temperature of the primary cir-
cuit too high.
40
- Reduced maximum withdrawable hot
water capacity compared to the initial
value.
- Impossibility of achieving the target tem-
perature.
Cleaning the plate heat exchanger
The plate heat exchanger on the sanitary
water side does not need to be dismantled
for cleaning: the fi ttings on the module can
be used.
First of all, cut off the power supply to the
module and remove the upper cover.
Close the taps for the cold water inlet, hot
water outlet and recirculation (if present)
so as to isolate the module. Turn the three-
way valve of the upper and lower multi-
functional unit towards the right.
This operation excludes all sanitary water
conduits not involved in the descaling pro-
cess, thereby protecting them against con-
tact with acidic substances.
Connect two rubber hoses to the cleaning
tap fi ttings. The hoses must be suffi ciently
long so that they can be connected to a
cleaning pump and collection tank.
The hoses should be secured with hose
clamps so as to avoid their accidental de-
tachment.
Open the cleaning taps by turning them
clockwise.
At this stage, the heat exchanger can be
cleaned by activating the pump in manual
mode for the time required to complete
cleaning.
Perform cleaning exclusively using deter-
gents and descaling products formulated
for drinkable water, pursuant to the law
in force in the country of installation, and
neutralise them at the end of the operation.
Once the cleaning cycle with detergents is
completed, it is advisable to perform a se-
ries of fl ushing operations with drinkable
water.