FITTED EQUIPMENT
105
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.
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 setpoint.
Should the burner flame cut out unexpectedly,
the FSD detects this and attempts to reignite
(for about 10 seconds), before shutting down
and raising a fault code.
Note: 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 3 kW,
relays on the PCB trip, feeding the 230 V
supply to the electric heating elements. These
are controlled by the same programme as the
gas heating.
Domestic Hot Water
The combi-type boiler automatically produces
hot water. Heat is emitted from the central
heating cylinder into the hot water cylinder.
If the hot water cylinder is empty, the air is
heated but no damage can result.
Note: 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.
! WARNING:
• The boiler must not be switched on if
there is no heat transfer fluid (HTF) in the
system.
• Always drain down the freshwater system
if there is risk of frost; in winter, for
example. You may continue to use the
boiler with no freshwater in the system, as
required; no damage can result
• Always replace the HTF in accordance
with the antifreeze product’s lifespan. If in
any doubt, replace the HTF after 2 years.
• Only sterilise the freshwater system with a
product suitable for stainless steel.
• Do not place stowage in the boiler
compartment.
• Do not position awnings, tents or other
enclosures around the flue terminal.
• Do not obstruct the flue. Be careful not to
flood the flue when washing the vehicle.
• The gas heating must not be used when
refuelling the vehicle at the service station
or related facility.
Domestic Hot Water
Being a combi-type boiler, the Alde 3020
Compact HE has an integrated, stainless steel
hot water cylinder that holds approximately 8.4
litres of freshwater.
The boiler can produce around 12 litres of
40°C warm water per 30 mins (at a cold
water temperature of 10 °C). If only the
electric heating is used, this capacity is slightly
reduced.
The hot water should not be used for drinking
or cooking.
Always flush out the hot water cylinder before
use, especially when it has stood empty for
some time. Any steriliser products should
be suitable for use with stainless steel.
Avoid steriliser products containing sodium
hyperchlorite, for example, as these will cause
severe corrosion damage to the hot water
cylinder. Read the product label or contact the
product manufacturer for details.
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