ALUTHERM
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Boilers 28
ALUTERM A 170 - 300
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Installation, user and service manual
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instructions for user
Heating
Alutherm A 170 - 300
6.3.3 Water-treatment
Before filling up the installation (old and new), the installation should be rinsed thoroughly with clean water from the tap.There are some
rinsing/cleaning products listed below and it is recommended that these are used.
• The pH must be kept between 7 and 8,5 at all times.
• The maximum allowed content of chlorides is 150 mg/ltr.
•
The water hardness of the heating system must be according the German VDI guideline 2035. See table beneath.
Water hardness in heating systems according VDI 2035 guideliness
Water-treatment
<0,11 ºdH = demineralised
ºdH =German VDI hardness
Installation
< 20 ltr/kW
Installation
between 20 and 50 ltr/kW
Installation
> 50 ltr/kW
50-300kW total boiler capacity
<11,2 ºdH
<8,4 ºdH
<0,11 ºdH
300-600kW total boiler capacity
<8,4 ºdH
<0,11 ºdH
<0,11 ºdH
>600kW total boiler capacity
<0,11 ºdH
<0,11 ºdH
<0,11 ºdH
• For instance : for an Intermodul 340 kW boiler and a total hardness of 8,4 °dH (German hardness) the total volume of filled, refilled and topped up
water must not exceed 20 ltrs/kW. If this hardness value is exceeded the total amount of filling, refilling and topping up water is : (8,4/actual
hardness in °dH) x ltrs/kW. In case of water hardness of 15 °dH the maximum volume/kW is : (8,4/15) x 20 = 11,2 ltr/kW.
If higher values are present, the water should be softened.
The water may only be partly softened to a value of 20 % of its original value, Example : if the initial hardness is 15°D, then it may only be softened
to 3,0 ºD
Note that water softening by means of ion exchange principle is not allowed.
If the installation is filled with demineralised or distilled water additives must be added to stabilise the pH value in order to prevent corrosion.
Before filling with demineralised water the complete installation must be rinsed.
• The maximum allowed content of chlorides is 150 mg/ltr
• The conductivity of the non treated installation water must not exceed the value of 300 μs/cm in combination with max O2 content of 0,1 mg/
ltr. If the O2 content is lower than 0,02 mg/ltr a higher conductivity llimit of 600 μs/cm is allowed.
If the conductivity is higher than the values mentioned, empty the system, flush and fill with clean tap water, preferably by adding the
recommended cleaning products.
• The water pressure must be higher than 0,8 bar
• The water quality must be checked on a regular basis (at least once per year)
• There are many products available on the market which pretend to clean and protect heating systems. Unfortunately there are only a few that
have really proven this in practice.Therefore Alutherm only allows the following quality products for water treatment ;
Producer:
Fernox
www.fernox.com
- Cleaner F3:
removes corrosion, lime and sludge
- Protector F1:
protects against corrosion, lime and sludge
- Alphi-11:
anti-freeze and protection against corrosion and lime
Producer:
Sentinel
www.sentinelprotects.com
- X100:
Inhibitor scale and corrosion protection
- X200:
Noise reducer long life system treatment to eliminate noise
- X300:
System cleaner for new hydronic heating systems
- X400:
System restorer non acid cleaning of older systems
- X500:
Inhibites antifreeze against scale and corrosion in all types of indirect heating systems at low temperatures
Note that these products must be used strictly in accordance with the water treatment manufacturers instructions.
Furthermore we strongly recommend the following ;
• Use the above mentioned water treatment protection products to fill and protect the installation
• Use a log book to record water filling, refilling, topping up, water quality measurements and water treatment
• Only use diffusion tight material, especially for under floor heating
• Always mount air vents at the highest points in the installation.
• Install isolation/check valves near the boiler and on strategic locations (anticipating any future expansions of the system) to avoid fills, refills and
topping up as much as possible.
• Install a water meter to check the amount of filled, refilled and topped up water.
• Install a filter (magnetite and dirt) in the return.
• Install an isolation heat-exchanger to separate the boiler from the installation to protect dirt or lime in the secondary system from affecting
The boiler.
• avoid leaks and if there is a leak, repair as soon as possible.
