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4 .3
Water Chemistry Guidelines
NOTICE: If using anti-freeze:
► For freeze protection use only propylene glycol, with
scale inhibitors, with a maximum of 40% glycol.
► Frost protection level has to be checked annually during
the regular scheduled maintenance of the condensing
boiler.
NOTICE: System damage!
► It is the installer's responsibility to ensure that the
heating system is compatible with the boiler type and
size installed.
► pH-value of the heating water to be kept between 6.5
and 9.
IMPORTANT: To avoid any presence of oxygen in the
system, it is advised to prevent as little as possible air
during installation. Usual spots where air is most likely to
seep in are: gaskets, pumps, air vents and O-rings. Using
an automatic water fill system exposes the system to fresh
oxygenated water.
A minimum water pressure is required for optimum
performance. Minimum water pressure required: 7.25 psi
(0.5 bar).
Before and during assembly, the system must be kept free
of impurities, construction dust, sand, copper dust, grease,
carbon deposits, etc., as well as soldering flux residue. In
any of these instances, the old system must be rinsed with
clear water mixed with a highly concentrated rinse agent.
NOTICE: DO NOT use PVC for vent piping when using
anti-freeze in the primary circuit of the boiler . Use
CPVC, PP or stainless steel only! .
Water hardness must fall within the following limits:
50 ppm of CaCO
< (alkali strength) < 150 ppm of CaCO
3
► Use only untreated water to fill the system.
► Do not use TSP (tri-sodium phosphate).
► Do not use fill water treated with salt bedding type exchangers (ion
exchanger).
► Never introduce non-approved boiler treatment or similar additives.
► Only use fill water with a hardness below 7 grains.
► Filling with chlorinated water is acceptable if chlorine levels are below
100 ppm.
► Consult a local water treatment specialist for recommendations if any
of the above is outside the stated ranges.
► When using oxygen permeable PEX, the system must be separated
from the boiler by a heat exchanger.
► A correctly sized and working expansion vessel must be installed.
► Do not exceed the maximum permissible flow rate through the boiler.
► Excessive flow can cause erosion damage to the heat exchanger.
► Eliminate System Leaks:
Continuous addition of make-up water will constantly add oxygen to
the system and lead to corrosion. All system leaks must be repaired.
SSB
In the following table are listed the chemical water specifications.
Parameters
General feature
Dissolved Oxygen
Total iron (Fe)
Total copper (Cu)
Na
SO
2
3
N
H
2
4
PO
4
Tab. 1
4 .4
Hydraulic connection are shown in Fig. 2, Fig. 3 and Fig. 4. In the
following table are listed the pipe dimension for each model:
Model
SSB85
SSB120
SSB160
• Do not use cleaning fluids that are not compatible with the boiler
materials, including acids (e.g. hydrochloric acid and similar ones) at
any concentration
• Introducing fresh water to the system increases the oxygen presence
and can cause corrosion of metallic components. Immediately repair
any drips or leaks in the system to avoid constant introduction of air
into the system.
• Do not use the water contained in the boiler for domestic use or as
drinking water or within swimming pools.
• Excessive fluctuation in pressure changes in the system can cause
fatigue and stress on the heat exchanger. This is detrimental to the
integrity of the boiler and system components, it is mandatory to
maintain a constant operating pressure.
.
3
Units
-
mg/l
mg/l
mg/l
mg/l
mg/l
mg/l
Water specification
Hydraulic connection
Ø Water supply
connection
1"
1"
1"
NOTICE: Before connecting the boiler to the heating
system, flush the heating system to remove sediment, flux,
dirt, and other foreign matter. The heat exchanger may be
damaged by sediment or corrosion.
Installation | 15
Value
Colorless, no sediment
< 0,05
< 0,3
< 0,1
< 10
< 3
< 15
Ø Water return
connection
1"
1"
1"
6720818456 (2018/06) US
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