Ariston NUOS Manual page 62

13. It is mandatory to screw on to the appliance's water intake pipe a suitable
device against overpressure; this device must not be tampered with and
must be made to operate frequently in order to check that it is not blocked
and to remove any limescale. In countries which acknowledge EN 1487,
the appliance's water intake pipe must be equipped with a safety device
compliant with said standard; it must be calibrated to a maximum pressure
of 0.7 MPa, including at least a cock, check valve, safety valve and
hydraulic load cut-out.
14. It is normal that water drips from the overpressure safety device or from the
EN 1487 safety unit when the appliance is heating. For this reason one
must install a drain, open to the air, with a continuously downwards sloping
pipe, in an area not subject to subzero temperatures. A condensate drain
should also be connected to the same pipe with a special coupling.
15. Make sure you drain the appliance when it is out of service in an area
subject to subzero temperatures. Drain as described in the appropriate
chapter.
16. Water heated to over 50°C can cause immediate serious burns if delivered
directly to the taps. Children, disabled persons and the aged are
particularly at risk. We recommend installing a thermostatic mixer valve on
the water delivery line.
17. Do not leave flammable materials in contact with or in the vicinity of the
appliance.
18. The appliance is not supplied with batteries. Where these are required, only
use the battery kit made by the manufacturer. Carefully observe the
polarity when fitting. At the end of their life, dispose of batteries in
accordance with applicable legislation using dedicated containers.
Disconnect the appliance from the mains power supply when fitting or
removing batteries.
Heat pump water heater – SAFETY WARNINGS
61