9
C
ENTRAL
H
EATING
Detailed recommendations are given in BS 6798:1987 and BS 5449-1:1990,
the following notes are given for general guidance.
P
IPE
W
ORK
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
cock-type valves within the system.
S
YSTEM
D
ESIGN
This boiler is suitable only for sealed systems.
D
RAIN
C
OCKS
These must 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.
S
AFETY
V
ALVE
D
ISCHARGE
(P
RIMARY
W
ATER
)
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.
M
AINS
W
ATER
F
EED
- C
ENTRAL
H
EATING
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 drawn to, for GB: Guidance G24.2 and recommendation
R24.2 of the water regulations guide and for IE: the current edition of
I.S.813.
F
ILLING
A temporary method for initially filling the system and replacing lost water
during servicing and initial filling (complying to current water regulations
and byelaws) is provided. The flexible hose must be removed once the
system has been filled.
R
ESIDUAL
H
EAD OF THE
B
OILER
