- 25 -
INST
ALLA
TION
- 25 -
INST
ALLA
TION
GENERAL REQUIREMENTS
Air release points
These must be fitted at all high points where
air will natural collect and must be sited to fa-
cilitate complete filling of the system.
Expansion vessel
The appliance has an integral sealed expan-
sion vessel to accommodate the increase of
water volume when the system is heated.
Refer to Fig. 4.4 on page 20 for its technical
data.
If the heating circuit has an unusually high
water content, calculate the total expansion
and add an additional sealed expansion ves-
sel with adequate capacity.
Mains water feed: central heating
There must be no direct connection to the
mains water supply even through a non re-
turn valve, without the approval of the Local
Water Authority.
Filling
A method for initially filling the system and
replacing water lost during servicing must be
provided and it must comply with local water
authority regulations.
The correct method is shown in Fig. 5.4.
The temporary connection must be re-
moved immediately after filling.
Fig. 5.4
Control
valve
Double
check valve
Temporary
connection
Supply pipe
(cold water
inlet)
Control valve
C.h. return pipe
The installer should ensure that no leaks exist
either inside the boiler or on the system as
frequent filling of the system could cause pre-
mature scaling of the heat exchanger.
5.9 Water treatment
C.h. circuit
Where a new boiler is fitted to a new system
with either plastic or copper pipes, it is impor-
tant the system is fully flushed, on completion,
to ensure flux residues, swarfs, oils and other
installation debris is removed.
Where a new boiler is fitted to an existing sys-
tem, it is important the debris from the existing
system is fully removed in order to ensure the
efficiency of the new appliance is maintained.
Details on flushing procedure are given in the
section "Initial filling of the system" to page 36
of this manual.
5.10 Electrical supply
Warning, this appliance must be earthed
External wiring to the appliance must be car-
ried out by a competent person and be in ac-
cordance with the current I.E.E. Regulations
and any local regulations which apply.
Reference should be made to the current
ETCI rules for electrical installations.
For Ireland (IE), refer to I.S.813.2002.
The boiler is supplied for connection to a 230
V~ 50 Hz supply. The supply must be fused
at 3A.
The method of connection to the electricity
supply must facilitate complete electrical iso-
lation of the appliance by the use of a fused
double pole isolator having a contact separa-
tion of at least 3 mm between poles or alter-
natively, by the use of a 3A fused three pin
plug and unswitched shuttered socket outlet
both complying with BS 1363.