general
1.
2.
o
3. All components of the system must be suitable for a working
pressure of 3 bar and temperature of 110
o
be taken in making all connections so that the risk of leakage is
a.
b.
c.
d.
4. ‘Make-up’ Water.
loss from the system, either :
a.
above the highest point of the system and be connected
or
b.
expansion vessel will be reduced and a larger vessel
or for any other reason, an additional vessel be
Notes
a. The method of lling, relling, topping up or ushing sealed
primary hot water circuits from the mains via a temporary hose
connection is only allowed if acceptable to the local water
authority.
b. Antifreeze uid, corrosion and scale inhibitor uids suitable for
use with boilers having aluminium heat exchangers may be used
in the central heating system.
2
sysTEM REqUIREMENTs - Central heating
Water Flow Rate and pressure Loss
o
C 20
(
o
safety valve setting
Vessel charge pressure
system pre-charge pressure
system volume Expansion vessel
(litres) volume (litres)
For other system volumes
multiply by the factor across
5. Filling
Where the mains pressure is excessive a pressure
a.
b. Fill and vent the system until the pressure gauge
c. Check the operation of the safety valve by raising the
d. Release water from the system until the
minimum system design pressure is reached;
continued . . . . . .
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