Ariston 200D Instructions pour l'installation, l'utilisation et l'entretien - Page 12

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GENERAL GUIDANCE

Current guidance notes do not cover the connection of a solar
thermal circuit to an unvented storage vessel (cylinder). However, if
guidance is sought for compliance with current regulations the fun-
damental principle is to provide a failsafe means of shutting off the
solar input to the heat exchanger if the cylinder temperature should
rise above the set temperature
of the cylinder's energy cut out. (see Note 1). As with all unvented hot
water systems, notification of intention to install should be given to
your local building control.
250I WITH TYPICAL SOLAR CONNECTION
LEGIONELLA BACTERIA FUNCTION
Legionella are small rod shaped bacteria which are a natural constituent of all fresh waters. Legionaries' disease is a serious pneumonia in-
fection caused by inhaling the bacteria Legionella pneumophilia or other Legionella species. This bacterium is frequently found in domestic,
hotel and other water systems and in water used for air conditioning or air cooling system. Hence the main intervention against the condition is
prevention, through control of the organism in water systems. The European standard CEN/TR 16355 gives recommendations for good practice
concerning the prevention of Legionella growth in drinking water installations but existing national regulations remain in force. This storage
water heater is supplied with the thermal disinfection cycle deactivated by default. Each time the product is turned on and every 30 days, the
system carries out a thermal disinfection cycle raising the temperature of the boiler to 60°C.
Warning: when this software has been carrying out the thermal disinfection treatment, water temperature can cause severe burns instant-
ly. Children, disabled and elderly are at highest risk of being scalded. Feel water before bathing or showering.
12 /EN
• OPTION A: A non self resetting mechanical shut-off should be in-
stalled on the solar primary flow to the cylinder. The mechanical
shut-off should be suitable for use with a solar primary circuit (i.e.
high temperature and glycol resistant). The mechanical shut-off
should be integrated electrically with the cylinder energy cut out/s
and if necessary the solar circuit temperature control, please refer
to the solar controller manufacturer for further information.
• OPTION B: Where the solar controller and hydraulic system
demonstrate that by no lesser means the requirement in Option
A is satisfied by other means; certification by an approvals body is
required to demonstrate that in the event of the stored water go-
ing over temperature, the heat input to the cylinder is isolated by
physical means and is non self resetting. These systems should be
clearly identified with reference to the approvals body. (See Note 2).
- Note 1: Whilst most solar cylinders use a coil type heat exchanger
other options such as external plate to plate devices , external an-
nulars or 'tank in tank' systems may be used but the same control
options always apply.
- Note 2: Current approved bodies include the British Board of
Agreement (BBA) , WRc-NSF Limited, or KIWA.
250I OVERHEAT STA WIRING (TYPICAL)
S3
Sensor
Shares
pocket with
overheat stat
S2
Sensor
Fitted
to electric
heater flange
The 250I version has an indirect coil that is intended for connection
to a water heating system, such as a boiler as show below.
A manual reset overheat stat is supplied fitted to the product.
This stat should be wired so that in the event of over temperature in
the product's hot water system the thermostat breaks the electrical
supply to the motorized valve which in turn mechanically closes pre-
venting primary water entering the coil.
The overheat setting fro the stat should be set at a maximum tem-
perature 70°C
Sensors from
Solar Controller
Switched Live,
Neutral and Earth from
Solar Controller
Manual Reset
Overheat Stat NC
Solar Pump