Specified Use; System Design; Gas Heating; Electric Heating - Bailey Approach Autograph Series Owner's Manual

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The Alde Heating System
Alde Compact 3020

Specified Use

These instructions are approved for the
Alde 3020 Compact HE fitted in caravans or
motorhomes.
The system is not intended for use by persons
(including children) with reduced physical,
sensory or mental capabilities, or lack of
experience and/or knowledge, unless they have
been given instruction or are supervised.
In the unlikely event that your system develops
a fault, switch off the system and contact Alde,
or your Bailey dealer.
The owner is always responsible for arranging
maintenance and inspection.

System Design

The boiler's internal heat exchanger consists
of three concentric cylinders. The combustion
chamber, the central heating cylinder and the
hot water cylinder.
The combustion chamber is made from
aluminium, and is divided into two halves by a
baffle plate, with the burner head located in the
top half, and the flue gases venting through the
bottom half.
The combustion assembly is fixed to the end of
the internal heat exchanger. It consists of the
burner, combustion fan, gas valve, air intake and
exhaust ducts, and gas line.
Two electric heating elements are sealed inside
the central heating cylinder, one for 1 kW, one
for 2 kW.
The room thermostat is integrated into the
touch screen control panel and connected to
the boiler by a Registered Jack (RJ) cable.

Gas Heating

When gas heating is set to on, the combustion
fan starts to revolve. Once the correct speed is
achieved (in rpm), a signal is sent to the PCB
for the burner to be lit. The gas valve opens,
passing gas, and the ignition module on the
PCB generates sparks at the electrode on
the burner head. When the burner ignites, a
flame supervision device signals the ignition
module to cease sparking. The burner fires until
the boiler or room thermostat reach the set
temperature.
Should the burner flame go out unexpectedly,
the Flame Safety Device detects this and
attempts to reignite (for about 10 seconds),
before shutting down and raising a fault code.
Listen carefully to the ignition sequence of
the boiler. You should hear the whirl of the
combustion fan, the clunk of the gas valve and
the tick-tick of the ignition module.

Electric Heating

When electric heating is set to 1, 2 or 3kW, relays
on the PCB trip, feeding the 230V supply to the
electric heating elements. These are controlled
by the same programme as the gas heating.
When electric heating is selected on the Alde
control panel the PCB is used to switch the
boiler settings remotely.
In a good summer, for example, lower the
desired temperature on the control panel
to around 10°C. The central heating will not
circulate (unless the temperature drops to
10°C), but you will still have hot water.
The Alde 3020 Compact HE boiler has two 230V
electric heating elements, outputting 1050W
and 2100W, or 3150W combined, and drawing
5A, 9A, and 14A respectively (rounded).
230V breakers, fuses, fused spurs and isolator
switches should be rated for 16A.
Before using electric heating, check the current
limit on the electric supply you are hooking up.