Central Heating; Circulation Pump; Bleeding Air From The System - Bailey ADVANCE 2019 Owner's Manual

checked first and must be visibly clean to avoid
introducing contaminants or foreign objects
into the system.
Alde recommends using the Alde 1900-811 or
839 twin-motor service pump to fill the system.
To fill the system by hand, unscrew the
expansion tank cap (Fig. 1 [R]) and lift the
circulation pump (Fig. 1 [S]) out of the tank (if
applicable).
Carefully pour the HTF into the tank, and
repeat until the fluid level is about 1 cm above
the MIN mark when cold.
Fig. 1
c h
entral eating
The boiler is set to an upper limit temperature
of 85°C, i.e. the temperature of the heat
transfer fluid (HTF) as it circulates around the
pipes, radiators, convector etc.
To ensure the best performance from hydronic
heating, air must be able to circulate freely
around the back of the furniture (Fig. 2). Air
vents, cut into the top and bottom of the
furniture must be unobstructed by carpets,
cushions, or stowage etc.
The full length of a convector should be
ventilated for best performance.
Use gas and electric heating
simultaneously for the best
performance. The boiler will only use
as much energy as is needed, and is
93% efficient on a SEDBUK (seasonal
efficiency of domestic boilers in the
UK) based test.
Fig. 2
c p
irculation ump
A pump is used to circulate the HTF around the
central heating system.
B a
leeding ir
The HTF will contain some air. This is
unavoidable. Air bubbles can also be
introduced when the system is filled.
In a newly-filled central heating system you
will need to bleed air from the bleed points
to ensure best performance. There is an
automatic air bleed valve on the boiler. There is
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