Central Heating; Circulation Pump; Bleeding Air - Bailey Pursuit Owner's Manual

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.2 [R]), and lift the
circulation pump (Fig.2 [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. 2

Central Heating

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, convectors, etc.
To ensure the best performance from hydronic
heating, air must be able to circulate freely
around the back of the furniture (Fig.3). 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
i
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 3

Circulation Pump

A pump is used to circulate the HTF around
the central heating system. There are three
models of Alde circulation pump.
• 12v expansion tank circulation pump.
This light duty pump is ideally suited for
holiday-makers, or as an off-grid option for
the 230v inline circulation pump.
• 12v inline circulation pump. This heavy
duty, variable speed pump is designed for
all year round motorcamping.
• 230v inline circulation pump. This heavy
duty pump is powered directly by mains
electric, suitable for non-touring vehicles.

Bleeding Air

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
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