Filling; Central Heating; Circulation Pump; Bleeding Air From The System - Bailey Approach Autograph Series Owner's Manual

Filling

The central heating system is filled with HTF
through the expansion tank, either by hand, or
using the Alde service pump. Any containers
used for handling or storing the HTF should be
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 (1), and lift the circulation
pump (2) 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.

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. The baffle
borads in your motorhome allow this. Air vents
cut into the top and bottom of the furniture and
baffle boards must be unobstructed by carpets,
cushions, stowage, etc.
The full length of a convector should be
ventilated for best performance.
The below picture shows the circulation of air.
The air in the vehicle (or air sucked in from
vents in the floor) passes over the fins on the
convectors and is heated. The heated air then
rises. As it cools it drops and is circulated
towards the convectors where the cycle begins
again.
NOTE: Use gas and electric heating
simultaneously
performance. The boiler will only use
as much energy as is needed, and is
93% efficient on a SEDBUK based
test.

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
classic pump is ideally suited for traditional
holiday-makers, or as a lighter duty, off-grid
option for the 230V in-line circulation pump.
• 12V in-line circulation pump. This heavy
duty, variable speed pump is designed for
full-time motorhome camping.
• 230V in-line circulation pump. This heavy
duty pump is powered directly by mains
electric, suitable for seasonal pitches only.

Bleeding Air From The System

The HTF will contain some air. This is
unavoidable. Air bubbles can also be introduced
when the system in filled.
In a newly-filled central heating system, you
will need to bleed air from the bleed points to
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for the best