Technical information

9
CENTRAL HEA
TING
Detailed recommendations are giv
en in BS 6798:1987 and BS 5449-1:1990,
the following notes are given for general guidance.
PIPE 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 b
uilt-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 a
void freezing.
P
articular attention should be paid to pipes passing through ventilated
spaces in roofs and under floors.
BY-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
cock-type valves within the system.
SYSTEM DESIGN
This boiler is suitable only for sealed systems.
DRAIN COCKS
These m
ust be located in accessible positions to permit the draining of
the whole system.
The taps must be at least 15mm nominal size an
manufactured in accordance with BS 2870:1980.
SAFETY VALVE DISCHARGE (PRIMARY WATER)
The discharge should terminate facing downwards 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.
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, and must be in accordance with water supply regulations. Your
attention is dr
a
wn to
, f
or GB:
Guidance G24.2 and recommendation
R24.2 of the water regulations guide and for IE: the current edition of
I.S
.813.
FILLING
A temporary method for initially filling the system and replacing lost water
dur
ing servicing and initial filling (complying to current water regulations
and b
y
ela
ws) is provided. The flexible hose must be removed once the
system has been filled.
RESIDUAL HEAD OF THE BOILER