Installation Instructions

SSB 6720818454 (2016/02) US
Installation | 15
4.3 Water Chemistry Guidelines
NOTICE: If using anti-freeze:
► Follow the boiler manufacturer’s instructions on
antifreeze concentration.
► Frost protection and inhibitor 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.
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 gaskets. Using
an automatic water ll system exposes the system to fresh oxygenated
water. In commercial applications it is recommended to install a water
meter to measure the introduction of fresh water into the system.
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 welding ux residue. In any of these instances, the old system
must be rinsed with clear water mixed with a highly concentrated rinse
agent.
For freeze protection use only propylene glycol, with scale inhibitors, with
a maximum volume [concentration] of 40% of glycol.

NOTICE: DO NOT use PVC for exhaust venting 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
3
< (alkali strength) < 150 ppm of CaCO
3
.
► Use only untreated water to ll the system.
► Do not use TSP (tri-sodium phosphate).
► Do not use ll water treated with salt bedding type exchangers (ion
exchanger).
► Never introduce non-approved boiler treatment or similar additives.
► Only use ll 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 ow rate through the boiler.
► Excessive ow 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.
In the following table are listed the chemical water specications.
Parameters Units Value
General feature - Colorless, no sediment
Dissolved Oxygen mg/l < 0,05
Total iron (Fe) mg/l < 0,3
Total copper (Cu) mg/l < 0,1
Na
2
SO
3
mg/l < 10
N
2
H
4
mg/l < 3
PO
4
mg/l < 15
Tab. 1 Water specication
4.4 Hydraulic connection
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
Ø Water supply
connection
Ø Water return
connection
SSB255 1-1/2” NPT male 1-1/2” NPT male
SSB399 1-1/2” NPT male 1-1/2” NPT male
SSB512 2” NPT male 2” NPT male
NOTICE: Before connecting the boiler to the heating
system, ush the heating system to remove sediment, ux,
dirt, and other foreign matter. The heat exchanger may be
damaged by sediment or corrosion.
• Do not use cleaning uids 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 uctuation 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.