FITTED EQUIPMENT
118
Draining Freshwater
1. Switch off the water pump.
2. Open all water taps, showers, etc.
3. Open the safety/drain valve by lifting the
yellow tab (Fig 1 [M]), or by turning the blue
knob (Fig 1 [K]) 90°.
4. The system will drain directly below the
vehicle through the clear plastic hose on the
safety/drain valve. 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.
Note: Check that the red breather valve (Fig
1[N]) is allowing air to enter the hot water
cylinder, when it is being drained, and that
the clear plastic hose is not obstructed.
Figure 1
Open the manual safety/drain valve
Opening the safety/drain valve
Heat Transfer Fluid
The central heating system is filled with heat
transfer fluid (HTF), a solution of 50% ethylene
glycol antifreeze and 50% water.
! WARNING: 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.
Note: For re-filling 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 -35–37 °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. Read the product
label or contact the product manufacturer for
details.
! WARNING: 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.
Note: 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, and is not
covered under warranty.
ALDE HEATING OPERATING INSTRUCTIONS
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