Alde Compact 3020 HE User Manual

FITTED EQUIPMENT
107
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 antifreeze manufacturer will have a
maximum water hardness recommendation.
Read the product label or contact the product
manufacturer for details.
Note: 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.
! WARNING: 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.
Filling
The central heating system is filled with HTF
through the expansion tank, either by hand, or
using the Alde service pump. Any containers
used for handling or storing the HTF should
be checked first, and must be visibly clean
to avoid introducing contaminants or foreign
objects into the system.
Alde recommends using the Alde 1900-811 or
839 twin-motor service pump to fill the system.
To fill the system by hand, unscrew the
expansion tank cap (Fig 2 [R]), and lift the
circulation pump (Fig 2 [S]) out of the tank (if
applicable). Carefully pour the HTF into the
tank, and repeat until the fluid level is about 1
cm above the MIN mark when cold.
Figure 2

Alde Compact 3020 HE Specifications

General

Brand	Alde
Model	Compact 3020 HE
Category	Boiler
Language	English