Ariston INTESA TP23, User Manual

Page: 11 / 52

11
Drain Cocks:
These must be located in accessible positions to permit the drain-
ing of the whole system and should be fitted at all low points. The
taps must be at least 15mm nominal siz e and manufactured in
accordance with BS 2870:1980.
Safety Valve Discharge:
The discharge should terminate facing downward on the exterior
of the building in a position where discharging (possib ly boiling
water & steam) will not create danger or nuisance, but in an eas-
ily visible position, and not cause damage to electr ical compo-
nents and wiring.
The discharge must not be over an entrance or a window or any
other type of public access.
Air Release Points:
These must be fitted at all high points where air naturally collects
and must be sited to facilitate complete filling of the system.
The appliance has an integral sealed expansion vessel to accom-
modate the increase of water volume when the system is heated.
It can accept up to 6 litres (1.3 gal) of e
xpansion water. If the
heating circuit has an unusually high water content, calculate the
total expansion and add an additional sealed e xpansion vessel
with adequate capacity. This should be located on the return pipe
work as close as possible to the pump inlet.
Mains Water Feed - Central Heating:
There must be no direct connection to the mains w ater supply
even through a non-return valve, without the approval of the Local
Water Authority, therefore a temporary method for initially filling
the system and replacing lost w ater during servicing in accor-
dance with current Water Regulations and bylaws must be provid-
ed
(F
IG
. 6.6).
Installation
Note: The installer should ensure that there are no leaks as fre-
quent filling of the heating system can lead to premature
scaling of the main exchanger and failure of hydraulic com-
ponents.
Domestic Water :
The domestic water must be in accordance with the relevant rec-
ommendation of BS 5546:1990.
Copper tubing to BS EN
1057:1996 is recommended f or water carrying pipe w ork and
must be used f or pipe w ork carrying drinking water, a scale
reducer should also be used to reduce the r isk of scale forming
in the domestic side of the heat e xchanger.
C
ENTRAL
H
EATING
Detailed recommendations are giv en in BS 6798:1987 and BS
5449-1:1990, the following notes are given for general guidance.
E
A
B
D
C
F
IG
. 6.6
VR003A
Residual Head of the Boiler ∆ ∆ T=20
°
C
F
IG
. 6.5