66
THE ALDE HEATING SYSTEM
Always drain down and completely
empty the hot water cylinder
when there is risk of frost, unless
the vehicle is explicitly stated to
be self-winterising by the vehicle
manufacturer.
Failure to drain the hot water cylinder when
there is a risk of frost may result in frost
damage, which is not covered under warranty.
draining freSh water
opening manual Safety valve/drain valve
• Switch off the water pump.
• Open all water taps, showers, etc.
• Open the safety/drain valve by lifting the
yellow tab.
The system will drain directly below the
vehicle.
• Check that all water has emptied out
(7–10 litres). Leave the valve in the open
position until the next time the hot water
cylinder is used.
Check that the breather valve is allowing air to
enter the hot water cylinder when it is being
drained, and that the clear plastic hose is not
obstructed.
heat tranSfer fluid
The central heating system is filled with
heat transfer fluid (HTF), a solution of 50%
ethylene glycol antifreeze and 50% water.
The boiler must not be switched on if
there is no HTF in the system.
The antifreeze manufacturer will
have a maximum water hardness
recommendation. Read the product
label or contact the product
manufacturer for details.
Alde recommends antifreeze meeting VAG
G12++ or G13 specification, and deionised water
(0 ppm).
50:50 ethylene glycol antifreeze and water
will protect against frost down to -35 to 37°C.
A refractometer and/or hydrometer can be
used to measure the strength of the antifreeze
solution.
Corrosion protection will vary depending on
the lifespan of the antifreeze. Contact the
product manufacturer for details.
Always replace the HTF in accordance
with the antifreeze product’s lifespan.
If in any doubt, replace the HTF after
2 years.
The corrosion inhibitors found in ethylene
glycol antifreeze may not be cross-compatible.
When topping up or replacing the HTF, ensure
the new antifreeze is compatible with the
current antifreeze product. Read the product
label or contact the product manufacturer for
details.
As a rough guideline, blue and
red antifreeze products are not
compatible with each other, but VAG
G12++ and G13 spec antifreeze (purple/
magenta) is compatible with both.
Failure to fill with suitable HTF may
result in severe damage to your Alde
system, which is not covered under
warranty.
filling
The central heating system is filled with HTF
through the expansion tank either by hand or
by using the Alde service pump. Any containers
used for handling or storing the HTF should be
Breather Valve
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