elco AEROTOP L, Planner Manual

Page: 33 / 48

Installation
Water quality
Water quality
Circulators function well exclusively
with clean and high-quality tap water.
The most frequent factors that can
affect circulators and the system are
oxygen, limescale, sludge, acidity
level and other substances (including
chlorides and minerals).
In addition to the quality of water, in-
stallation also plays an important role.
The heating system must be airtight.
Choose materials that are not sensi-
tive to oxygen diffusion (risk of corro-
sion...).
Characteristics of the water

compliant with local regulations

Langelier Index (LI) between 0 and
+0.4

within the limits indicated in the
chart

Water quality must be checked by
qualified personnel.
Hardness
If the water is hard, install a system
suitable to preserve the unit from
harmful deposits and limestone for-
mation.
If necessary, install a water softener
to reduce water hardness
Cleanliness
Before connecting the water to the
unit, clean the system thoroughly with
specific products effective to remove
residues or impurities that may affect
functioning. Existing systems must be
free from sludge and contaminants
and protected against build-ups.
New systems
In case of new installations, it is es-
sential to wash the entire installation
(with the circulator uninstalled) before
commissioning the central installation.
This removes residues of the installa-
tion process (welding, waste, joint
products...) and preservatives
(including mineral oil). The system
must then be filled with clean high-
quality tap water.
Existing systems
If a new boiler or heat pump is in-
stalled on an existing heating system,
the system must be rinsed to avoid
the presence of particles, sludge and
waste. The system must be drained
before installing the new unit. Dirt can
be removed only with a suitable water
flow. Each section must then be
washed separately. Particular atten-
tion must also be paid to “blind spots”
where a lot of dirt can accumulate due
to the reduced water flow. The system
must then be filled with clean high-
quality tap water. If, after rinsing, the
quality of the water is still unsuitable,
a few measures must be taken to
avoid problems. An option to remove
pollutants is to install a filter. Various
types of filters are available. A mesh
filter is designed to catch large dirt
particles. This filter is usually placed
in the part with the larger flow. A tis-
sue filter is designed to catch the finer
particles.
Exclusions
The warranty does not cover damage
formed by limestone, deposits and
impurities deriving from the water
supply and/or by the malfunctioning of
the system cleaning system.
Risk of frost
 When the outside temperature gets
close to 0°C, the water in the pipes
and unit may freeze.
 Frost may determine irreversible
damage to the unit.
 Frost damage is not covered by the
warranty.
If the unit or hydraulic connections are
subject to temperatures close to 0°C:

mix water with glycol, or

safeguard the pipes with heating
cables placed under the insulation,
or

empty the system in cases of long
non-use
Anti-freeze solutions
Consider that the use of anti-freeze
solution determines an increase in a
pressure drop.
Make sure that the glycol type utilized
is inhibited (not corrosive) and com-
patible with the water circuit compo-
nents.
Do not use different glycol mixture
(i.e. ethylene with propylene).
Water filter
Use filter ≥ 30 mesh

It must be installed immediately in
the water input of the unit, in a posi-
tion that is easily accessible for
cleaning.
 The filter should never be removed,
doing so invalidates the warranty.
5% 10% 15% 20% 25% 30% 35% 40% 45% 50% % ETHYLENE GLYCOL BY WEIGHT
Freezing temperature °C -2 -3.9 -6.5 -8.9 -11.8 -15.6 -19.0 -23.4 -27.8 -32.7
Safety temperature °C 3 1 -1 -4 -6 -10 -14 -19 -23.8 -29.4