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Alde Compact 3020 HE - rev1504 Manual

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12. CARE AND MAINTENANCE
• Checking and changing glycol mixture. Regularly check the heating system’s fluid level in the expan-
sion tank. The level should be about 1 cm above the minimum mark, with the heating system cold. The
heating system should be filled with a fluid mixture made up from 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 free from salts and 40% ethylene glycol. If the heating system is exposed to temperatures lower
than -25°C, a higher ethylene glycol content must be used, but not more than 50%. Glycol mixture must
be changed every other year as properties such as corrosion protection will deteriorate. If Alde Premi-
um Antifreeze is used, the change interval can be extended to five years under normal operating con-
ditions. 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 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, and the pipes in the
heating system must be free of contamination. This is to prevent the growth of bacteria and corrosion in
the system. The boiler must not be started if there is no ethylene glycol fluid in the system.
• Filling glycol. The system is filled through the expansion tank, Either manually or using the Alde
filling pump (1900811), which both tops up and bleeds the system. For manual filling, unfasten the
circulation 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.
• Checking 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 fitting an Alde leak detector, type 4071, as close as possible to the reducing regulator.
• Emptying the water heater. The boiler is fitted with a built-in hot water heater which can hold approx-
imately 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 hea-
ting the water heater, the capacity is slightly reduced. The water in the water heater must be drained at
least once a month in order to create a new air cushion in the heater. The air cushion is used to absorb
pressure surges in the heater. 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 completely when there is a risk of frost and when
the vehicle is not in use.
NB! The warranty does not cover frost damage.
NB! Note that the water in the water heater can be hot.
Draining the heater using the combined safety/drain valve: (see page 15)
• Switch o the freshwater pump.
• Open all water taps.
• 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 (about 7-10 litres). Leave the valve in the open posi-
tion 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.
• Bleeding the system. 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, it 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 o the
circulation pump for a few seconds 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 lea-
ve it open until fluid starts coming out. If the boiler is equipped with an automatic air vent, bleeding
the boiler will take place automatically. Start the LPG boiler. The circulation pump should be switched
o. Open the remaining bleed screws in the system (please refer to the instruction manual of the
vehicle for their locations). Leave the bleed screws open until ethylene glycol fluid starts coming out
of them, and then close them. Start the circulation 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 o the circulation pump. Tilt the caravan forwards. Leave it in this posi-
tion 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 ethylene glycol fluid comes out. Proceed 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.
Motor caravan or twin-axle caravan. On these, the easiest way to bleed the system is to park the ve-
hicle 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 vented properly. Use the air vents that are located throughout the sys-
tem. Risk of overheating if the system is not suciently vented.
Functions marked with a (*) are accessories, which are not installed on all vehicles, refer to the vehicle
manufacturer’s instructions.
… 14 …


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