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Alde Compact 3020 Manual De Servicio página 4

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  • ESPAÑOL, página 73
1. ABOUT THE ALDE
CENTRAL HEATING SYSTEM
The central heating system consists of two or three heat
sources. A boiler, a 230-volt electric element and a heat
exchanger fitted externally for motor caravans. A Truma
AC can also be connected to the Alde central heating
system, thus giving a full automatic climate control sys-
tem. The boiler/electric element heats a fluid mixture con-
sisting of water (60%) and ethylene glycol (40%). Using
a 12-volt circulation pump (a 230-volt circulation pump
is available as an option) located in an expansion tank
or on the boiler, the hot ethylene glycol/water mixture
is circulated through the heating system via pipes and
convectors.
The convectors located along the outer walls heat up the
air, which rises upwards, heating walls and furnishings.
Since hot air rises, an air barrier is formed, which keeps
the chill away from the windows. The room temperature
in the caravan is controlled by a 12-volt room thermostat
on the control panel.
Compact 3020 boiler
Convector
Roof valve
Window
Air intake
Convectors
4
Heat exchanger 2968
1:1 GENERAL CARE OF THE HEATING
SYSTEM
Regularly check the heating system's fluid level in the
expansion tank. With the system cold, the level should
be about 1 cm above the minimum mark. The heating
system should be filled with a fluid mixture made up from
distilled water and ethylene glycol. For best results, use
high-quality ready-mixed ethylene glycol (with inhibitor)
intended for use in aluminium heating systems.
The proportions when using concentrated ethylene glycol
are 60% distilled water and 40% ethylene glycol. If the
heating system is likely to be exposed to temperatures
below -25°C, the ethylene glycol content must be in-
creased, but should not exceed 50%.
Any vessels used for handling or mixing the liquid must
be spotlessly clean, and the pipes in the heating system
must be free of contamination. This is to prevent the
growth of bacteria in the system.
The ethylene glycol mixture should be changed every
two years, as it tends to deteriorate in terms of properties
such as corrosion protection. The glycol content should
be checked before topping up with new fluid. This is to
prevent excessive concentration of ethylene glycol in the
mixture.
Filling pump Art. no. 1900 811
If the fluid level in the expansion tanks drops for reasons
other than evaporation, check all connections, the draw-
off tap and bleed screws, to ensure these are not leak-
ing. Check also the automatic bleeder to make sure it
has not jammed. If ethylene glycol has leaked out, rinse
with water and dry off. Never allow the heating system to
stand empty without ethylene glycol fluid.
Filling with fluid:
Make sure the vehicle is standing horizontally and check
that the bleed screws and draw-off tap are closed. Undo
the circulation pump's plastic nuts on the expansion
tank and lift the pump up. Now slowly pour the ethylene
glycol mixture into the expansion tank using a watering
can. Depending on how the pipes have been fitted, air
pockets may form when the system is filled with ethylene
glycol fluid. If the pipes only warm up a metre or so from
the boiler, even though the circulation pump is operating,
this is a reliable symptom of air trapped in the system.
For ease of filling and bleeding, we recommend the Alde
filling pump, which both tops up and bleeds the heating
system automatically and quickly. Alde's heating system
is installed with a non-return valve to prevent natural
circulation. The non-return valve is normally located at
the automatic bleeder on the boiler, see figure Rubber
connection with automatic bleed and non-return valve. In

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