Ariston VLS - Инструкция по эксплуатации - Страница 32

32 / EN

Safety group complies with the European standard EN 1487

Some countries may require the use of hydraulic special safety devices; the installer must check the 
suitability of the safety device he tends to use.
Do not install any shut-off device (valve, cock, etc.) between the safety unit and the heater itself.
The appliance’s drain outlet must be connected to a drain pipe of diameter at least equal to the of the 
outlet itself, with a funnel to permit an air gap of at least 20 mm for visual inspection. Use a hose to con-
nect the safety group to the mains cold water supply; fit a cock if necessary (

Fig.2, Rif.D

). 

In addition, a water discharge tube on the outlet (

Fig.2, Rif.C

) is necessary if the emptying tap is opened.

When installing the safety device, do not tighten it fully down, and do not tamper with its settings.
It is necessary to connect the drain, which must always be left exposed to the atmosphere, with a drain-
age pipe that is installed sloping downwards in a place with no ice. If the network pressure is closed 
to the calibrated valve pressure, it will be necessary to apply a pressure reducer far away from the 
appliance. To avoid any possible damage to the mixer units (taps or shower) it is necessary to drain any 
impurities from the pipes

Electrical connection

It is mandatory, before installing the appliance, to perform an accurate control of the electrical system by 
verifying compliance with current safety standards, which is adequate for the maximum power absorbed 
by the water heater (refer to the data plate) and that the section of the cables for the electrical connec-
tion is suitable and complies with local regulations.

The manufacturer is not liable for damage caused by lack of grounding or anomalous power
supply. Before starting up the appliance, check that the power rating matches that given on the name-
plate. The use of multiplugs, extensions or adaptors is strictly prohibited.
It is strictly forbidden to use the piping from the plumbing, heating and gas systems for the appliance 
earthing connection. If the appliance is supplied with a power supply cable, should the latter need re-
placing, use a cable featuring the same characteristics (type H05VV-F 3x1,5 mm

2

, 8,5 mm in diameter). 

The power cable (H05VV-F 3x1.5 mm

2

 dia. 8.5 mm) must be routed in the recess at the back of the ap-

pliance to the terminal block (

Fig. 7, Ref. M

). Tighten down the terminal screws to connect the individual 

wires securely. Secure the power supply cable in place using the special cable clamps provided with 
the appliance.
Use a two-pole switch conforming with national laws in force (contact gap of at least 3 mm, preferably 
equipped with fuses) to disconnect the appliance’s power supply.
The appliance must be grounded with a cable yellow/green and longer than the phase cable) connected 
to the terminals marked 

 (

Fig.7, Rif.J

). 

Before starting up the appliance, check that the power rating matches that given on the nameplate.
If the appliance is not supplied with a power supply cable, choose one of the following installation 
modes:
-  Connection to mains with a rigid pipe (if the appliance has no cable clamp); use a cable with a minimum 

3x1,5 mm

2

 section;

-  With a flexible cable (type H05VV-F 3x1,5 mm

2

, 8,5 mm in diameter), qif the appliance is supplied with 

a cable clamp.