Filter
Top Products
7
C
ENTRAL HEATING
Detailed recommendations are given in BS 6798:1987 and BS 5449-1:1990, the
following notes are given for general guidance.
P
IPE WORK:
Copper tubing to BS EN 1057:1996 is recommended for water pipes. Jointing should
be either with capillary soldered or compression fittings.
Where possible pipes should have a gradient to ensure air is carried naturally to air
release points and water flows naturally to drain taps.
The appliance has a built-in automatic air release valve, however it should be
ensured as far as possible that the appliance heat exchanger is not a natural
collecting point for air.
Except where providing useful heat, pipes should be insulated to prevent heat loss
and avoid freezing.
Particular attention should be paid to pipes passing through ventilated spaces in
roofs and under floors.
B
Y
-PASS:
The appliance includes an automatic by-pass valve, which protects the main heat
exchanger in case of reduced or interrupted water circulation through the heating
system, due to the closing of thermostatic valves or radiator valves within the
system.
SYSTEM DESIGN:
This boiler is suitable only for sealed systems.
Drain Cocks:
These must be located in accessible positions to permit the draining of the whole
system and should be fitted at all low points. The taps must be at least 15mm
nominal size and manufactured in accordance with BS 2870:1980.
S
AFETY
VALVE
DISCHARGE:
The discharge should terminate facing downward on the exterior of the building in a
position where discharging (possibly boiling water & steam) will not create danger or
nuisance, but in an easily visible position, and not cause damage to electrical
components and wiring.
The discharge must not be over an entrance or a window or any other type of public
access.
A
IR 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 accommodate the
increase of water volume when the system is heated.
It can accept up to 6 litre (1.3 gal) of expansion water. If the heating circuit has an
unusually high water content, calculate the total expansion and add an additional
sealed expansion vessel with adequate capacity. This should be located on the
return pipe work as close as possible to the pump inlet.
M
AINS 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.
F
ILLING:
A temporary method for initially filling the system and replacing lost water during
servicing and initial filling (in accordance with current Water Regulations), is provided
as an integral part of the connection kit (see F
IG. 2.4). The flexible hose must be
removed once the system has been filled.
RESIDUAL HEAD OF THE BOILER