Alde Compact 3020 HE Manuel d'utilisation - Page 14
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12. CARE AND MAINTENANCE
Checking and changing glycol mixture. Regularly check the heating system's fluid level in the expansion tank.
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With the heating 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 inhibitors) intended for use in aluminium heating systems.
The proportions when using concentrated ethylene glycol are 60% distilled water (or water that is free of
salts) and 40% ethylene glycol. If the heating system is likely to be exposed to temperatures below -25°C, the
ethylene glycol content must be increased, but should not exceed 50%. The ethylene glycol mixture should
be changed every other year, as certain properties such as corrosion protection deteriorate over time. If Alde
Premium Antifreeze is used, the interval for changing the mixture can be extended to five years under normal
operating conditions. If the fluid level is too low, the ethylene glycol content must be checked before topping
up. This is to prevent excessive concentration of ethylene glycol in the mixture. When topping up, use the
same quality of ethylene glycol mixture as is already in the system, alternatively use Alde Premium Antifreeze,
which is compatible with most ethylene glycol brands on the market.
NB. Any vessels used for handling or mixing the liquid must be spotlessly clean. This is to prevent the growth
of bacteria and corrosion in the system. The boiler must not be started if there is no glycol fluid in the system.
Filling with glycol fluid. The system is filled through the expansion tank, either manually or using the Alde
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filling pump
(1900811),
pump nut (R) and then lift the pump *(S) out of the tank. Slowly pour the ethylene glycol mixture into the
tank.
Bleed the system. Top up with more fluid if the level has fallen after bleeding. Bleed a newly filled heating
system regularly during the first days it is in operation.
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Checking the LPG system. The LPG system should be checked regularly by a specialist, who will ensure that
there are no leaks from connections or hoses. LPG hoses should be changed as indicated on the date stamp,
as they tend to dry out and crack, and are liable to leak as a result. For increased safety, we recommend fit-
ting an Alde leak detector, type 4071, as close as possible to the reducing regulator.
Emptying the hot water heater. The boiler is fitted with a built-in hot water heater which can hold approxi-
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mately 8.5 litres of freshwater. The hot water heater can produce around 12 litres of 40°C water per half-hour
(at a cold water temperature of 10°C). If the electric elements are used instead of gas for heating the water
heater, the capacity is slightly reduced. Always renew the air cushion in the water heater after 10 days of use.
This can be done by opening the safety/drain valve on the boiler for a few seconds.
For emptying specially-adapted boilers, as well as the vehicle's general freshwater system, please refer to the
manufacturer's instructions.
NB. The hot water heater should always be drained down completely when there is a risk of frost
and when the vehicle is not in use. The warranty does not cover frost damage.
NB. Remember that the water in the water heater may be hot.
Draining the water heater using the combined safety/drain valve: (see page 15)
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Switch off the freshwater pump.
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Open all water taps.
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Then open the safety/drain valve by raising the yellow lever (M) to a vertical position, or by turning the knob
(K) 180°. The heater will now drain directly below the vehicle through the safety/drain valve hose. Check that
all the water is emptied out (about 7-10 litres). Leave the valve in the open position until the next time the
heater is used.
NB. Check that the automatic non-return valve (N) is open and is allowing air to enter the heater when it is
being drained, and that the hose is not blocked.
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Bleeding the system. Depending on how the pipes have been fitted, air pockets may form when the system
is filled with 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 symptom of air trapped in the system. In a newly filled system, small air bubbles
can form in the expansion tank, resulting in a gurgling sound. Switch off the circulation pump for a few sec-
onds to allow the bubbles to disappear.
Bleed as follows: If a bleed screw is fitted to the outgoing pipe of the boiler, open this screw and leave it open
until fluid starts coming out. If the boiler is equipped with an automatic air bleed valve, bleeding the boiler
takes place automatically. Start the LPG boiler. The circulation pump should be switched off. Open the re-
maining bleed screws in the system (please refer to the instruction manual of the vehicle for their locations).
Leave the bleed screws open until glycol fluid starts coming out of them, and then close them. Start the cir-
culation pump and let it run for a while. See if the pipes and radiators are heating up around the vehicle.
If this does not help, you can try the following method:Single-axle caravan: Switch off the circulation pump.
Tilt the caravan forwards. Leave it in this position for a few minutes to allow the air to travel upwards in the
system. Open the bleed screw located at the highest point. Leave it open until glycol fluid comes out. Pro-
ceed in the same manner but with the caravan tilted backwards. Then position the caravan horizontally and
start the circulation pump. See if the pipes and radiators are heating up around the vehicle.
Motorhome or twin-axle caravan: For these, the easiest way to bleed the system is to park the vehicle on
sloping ground or to raise one end of the vehicle using a jack. Bleed the system as described above.
NB. Ensure that the system is bled properly. Use the air bleed valves that are located throughout the system.
Risk of overheating if the system is not properly bled.
Functions marked with a (*) are accessories, which are not installed on all vehicles, refer to the vehicle
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manufacturer's instructions.
which both tops up and bleeds the system. For manual filling, unfasten the circulation