- 36 -
INST
ALLA
TION
- 36 -
INST
ALLA
TION
GENERAL REQUIREMENTS
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 pag. 27 for its technical
data.
If the heating circuit has an unusually high wa
-
ter content, calculate the total expansion and
add an additional sealed expansion vessel
with adequate capacity.
Mains water feed: central heating
There must be no direct connection to the
mains water supply even through a non return
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. 5.5.
The temporary connection must be removed
immediately after filling.
Fig. 5.5
Temporary
connection
Control valve
Control valve
Double check valve
Supply pipe
(cold water inlet)
C.H. return pipe
The installer should ensure that no leaks ex
-
ist 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, swarf
, 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" on page
53 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 mains supply to this appli-
ance must be protected with a 3A
mains fuse, under no circum-
stance should this fuse rating be
exceeded.
The method of connection to the electricity
supply must facilitate complete electrical iso
-
lation of the appliance by the use of a fused
spur isolation switch. Its installation permits a
complete switching off in the conditions of the
overvoltage category III. Alternatively it can be
connected with a 3A fused three pin plug and
unswitched shuttered socket outlet both com
-
plying with BS 1363.
The point of connection to the electricity sup
-
ply must be readily accessible and adjacent to
the appliance, except where the appliance is
installed in a bathroom, this must then be sited
outside the bathroom.
