FITTED EQUIPMENT
109
Move on to the next bleed point and repeat,
until all bleed points have been tended to.
Air Lock
If enough trapped air accumulates at one
point, an air lock can result and prevent the
circulation of hydronic heating.
A ramp or steep slope can be used to raise
one end of the vehicle, causing the trapped
air to shift around the system. Repeat the full
bleed procedure. A caravan can be slowly and
carefully tilted to reproduce this effect.
To clear a stubborn air lock in under 15
minutes, an Alde-certified service agent can
use the Alde 1900-811 or 839 twin-motor
service pump.
230 V ELECTRIC
The Alde 3020 Compact HE boiler has two
230 V electric heating elements, outputting
1050 W and 2100 W, or 3150 W combined,
and drawing 5 A, 9 A, and 14 A respectively
(rounded).
230 V breakers, fuses, fused spurs and
isolator switches should be rated for 16 A.
Before using electric heating, check the
current limit on the electric supply you are
hooking up to.
• 6 A limit, only use 1 kW electric heating.
• 10 A limit, use 1–2 kW electric heating.
• 16 A limit, use 1–3 kW electric heating.
NB: If the electric supply has unstable voltage,
the amperage will also fluctuate.
LPG
LPG (liquefied petroleum gas) has two main
variants, propane and butane gas. The gas
heating in your Alde 3020 Compact boiler can
use propane or butane gas as fuel. Many LPG
fuels contain a mixture of propane, butane and
other additives.
BS 5482 Part 1 states, “For butane cylinders,
satisfactory service might not be obtained at
temperatures of less than 10 °C; the most
suitable temperature range is from 13 to 30
°C. For temperatures less than 13 °C, the use
of propane should be considered.”
For this reason, Alde recommends using
propane gas for all year round gas heating.
LPG cylinders contain both gas and liquid
forms. When the cylinder is filled, high pressure
transforms the gas into liquid. The liquid
reverts to gas when the valve on the cylinder
is opened.
LPG is a flammable gas. It can be a fire and
explosion hazard if stored or used incorrectly.
Store cylinders vertically and securely, to
prevent them from toppling.
Do not mount your LPG cylinder horizontally
or use liquid phase gas cylinders. Liquid–gas
explosion may result. Read the product label
or contact product manufacturer for details.
LPG is heavier than air. Should a gas
leak occur the fitted floor vents allow the
gas to escape from the caravan. For this
reason always ensure that floor vents are
unobstructed.
! WARNING: The boiler compartment
contains the gas connection, floor vents and
the flue hoses. Do not place stowage in the
boiler compartment.
In the event of a gas leak, or if you smell gas:
• Extinguish all naked flames
• Open all doors and windows
• Close all gas valves, including the valve on
the cylinder.
• Do not smoke.
• Do not operate any electrical appliances or
switches.
• Arrange for immediate inspection of the
gas system by a competent person in
accordance with current local regulations.
LPG from the cylinder is reduced in pressure
by a regulator, and is supplied to the boiler
at low pressure (30 mbar). Never use an
unregulated high pressure supply.
Where oil and dirt in the gas supply are a
concern, gas filters should be fitted to prevent
blockage of the boiler gas valve.
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