4
SIENA
Digital electronic water heater
2. Component check list
The product comes with the following components. Please check through the components supplied
and ensure that all parts are present:
•
Product with sheathed heating elements, digital thermostat, TFT screen and manual reset ther-
mal cut-out.
•
T/P valve 0.7 MPa 90ºC and electrolytic fittings.
•
Installation and user manual.
Please
contact our Technical Service department on 0203 321 5929
to find out how to acquire
the safety fittings.
3. General requirements
3.1. Building regulations
The domestic hot water cylinder MUST be installed by a competent person in accordance with
section G3 of the current Building Regulations.
3.2. Important
It is important that the installer reads and understands these instructions and unpacks and
familiarises themselves with the equipment before commencing the installation. Failure to observe
these installation instructions could invalidate the guarantee.
3.3. Water supply
The water supply to the cylinder should be potable water direct from a public mains water supply with
any water treatment equipment functioning correctly.
For optimum performance the unit should be fed via a 15 mm or 22 mm diameter supply pipe direct
from the mains water entry point to the property and supplies a maximum pressure of 0.9 MPa. The
unit can operate with a minimum supply pressure of 0.15 MPa and a flow rate of at least 20 litres per
minute, but flow from the outlets will be low if several outlets are used simultaneously. The cylinder
control equipment is factory set to limit the system operating pressure to 0.3 MPa. The maximum
supply pressure into the pressure-reducing valve is 0.9 MPa.
3.4. Taps and fittings
All taps and fittings incorporated in the unvented system should have a rated operating pressure of
0.7 MPa or above.
