This electric unvented storage water heater includes the basic
installation elements which are found in the packaging, i.e.:
- Insulating bushing for pipes.
- Safety valve.
Installation and first operation of the storage heater and the
fittings have to be done by an expert which can take the
responsibility for properly done work and explains the handling
For the connection the specific technical conditions of the
energy supplier as well as the valid standards and safety
regulations have to be considered.
WALL MOUNTING PROCEDURE
Use 4 adequately resistant and sturdy screws and rawl-
plugs capable of holding the weight of the filled heater.
The installation procedure is greatly facilitated by the possibility
to locate the unit horizontally (EWH-comfort/N and
EWH-classic/N) or vertically in a frost-free (!) place anywhere
It would be a good idea to place the unit as close as possible
to the outlet - short piping means little loss of temperature.
A minimum space of 50 cm below the outlet pipe is necessary
As shown in the drawing the input and output pipes must be
on the left side when the heater is installed horizontally.
Should the unit be close to a wall leave the recommended
minimum-space for maintenance and service.
Do not install the heater with its wall mounts against the floor
nor on a horizontal plane.
The heater must be connected to the water supply mains.
a) The safety valve - supplied with the heater- MUST be
installed on the cold water input (see right side)
- Before connecting the safety valve with the heater, the
connecting pipe must be rinsed carefully.
- The draining pipe and the safety valve must be left open
to the air and be installed in a continuous downward slope.
Water expands when heated. The units of the series classic,
basis and comfort are supplied with a safety valve that lets
the expanding water flow back into the cold-water feed.
The units of the series classic/N and comfort/N have a safety
valve that prevents the expanding water (N=non return)
from flowing back into the cold-water feed. Here a suitable
siphon for the absorption of the expanding water is to install.
The drain of the safety valve must not be blocked.
To open the safety valve (not safety valve basis) to let the
water flow from the heater - via the outlet - turn the knob
clockwise or counterclockwise as you please.
The proper operating of the safety valve should be tested
periodically that way:
- turn the knob clockwise or counterclockwise up to the top
- the water should flow out of the passage
- turn the knob to its down position
The pressure rating is indicated on the knob.
b) If the water-supply pressure exceeds 5 bar, a type-approved
reducing valve must be installed.
1 Safety valve
1. Safety valve
2. Turning knob for cleaning and draining
3. Draining pipe for the safety valve
4. Stop valve
5. Reducing valve - necessary when pressure is more than 5 bar-
to be installed after the "meter"
6. Earthed plastic sleeves (supplied with the heater)
All storage water heaters of the EWH-series are of 220/230 V
single phase design. Before connecting make sure that the
mains supply and unit input features coincide.
The heaters installation procedure is totally straightforward
and only requires that Low Voltage Electronic Regulations are
met. Although well known by the installers we would like to
point out some of the basics:
"The following volumes and provisions shall be taken into
account for installations in bathrooms or toilets".
PROHIBITED VOLUME.- It is the volume limited by the
tangential and vertical planes with respect to the outer edges
of bathtub, toilet pan or shower enclosure and by a plane
situated 2,25 m above the same or the floor, should the units
be embedded in the same.
Safety valve basis