Ferroli Domina 80 E Installation, Service And User Instructions Manual page 12

DOMINA 80 E
Water System
Note - the boiler is designed for sealed systems only and must NOT be used on open vented systems.
Central Heating
Detailed recommendations are given in BS6798, BS5449, BS6700 and CP342 Part 2. Pipework not forming
part of the useful heating surface should be insulated to prevent any heat losses or possible freezing (i.e.
in roof spaces or ventilated underfloor spaces). Drain taps should be positioned at the lowest point of the
system in accessible locations to permit the whole system to be drained down. The drain taps should be
in accordance with BS2879. Copper tubing to BS2871, Part 1 is recommended for water carrying
pipework. Pipework in horizontal runs should have a gradient where possible to facilitate the removal of
air. Ensure that the boiler heat exchanger is not a natural point for air collection. A typical heating system
with domestic hot water circuit is illustrated in fig. 9.
Important - If thermostatic radiator vales are fitted a bypass must be fitted to ensure a minimum flow rate
through the boiler of 6 l/min. The bypass should be fitted as far as possible from the boiler.
Make Up Water
Provision must be made for replacing water lost from the sealed system. Reference should be made to
BS6798, for methods of filling and making up sealed systems. There must be no direct connection
between the boiler's central heating system and the mains water supply. The use of mains water to charge
and pressurise the system directly, is conditional upon the Local Water Byelaws. Again any such
connection must be disconnected after use. A typical temporary filling loop is shown in fig. 10.
Domestic Hot Water
Always fit a scale reducer in "hard water areas" (18 clarke degrees or over)". A 15mm copper connection
point on the boiler for attaching to the main supply is provided. The maximum domestic water pressure
for the inlet supply is 10 bar (145 P.S.I.). If the cold mains supply exceeds 5 bar (72 P.S.I.), a water
governor or pressure reducing valve must be fitted by the installer into the mains supply in an
inconspicuous but accessible position preferable between 3 and 5 metres (10-16ft) before the appliance.
Such a valve must be approved by the Water Research Council.
Attention - is drawn to the Model Water Byelaws.
Fittings manufactured from duplex (alpha-beta) brass are not acceptable for underground use and certain
water undertakings will not accept their use above ground.
Ensure all pipework is adequately supported
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