FORCE W
146
EN
cod. 3541Q760 - Rev. 00 - 01/2019
System water characteristics
B
FORCE W
boilers are suitable for installation in heating systems with non-signifi-
cant entry of oxygen (ref. systems "case I" EN14868). A physical separator (e.g.
plate heat exchanger) must be provided in systems with continuous entry of oxy-
gen (e.g. underfloor systems without antidiffusion pipes or open vessel), or inter-
mittent (less than 20% of system water content).
The water within a heating system must have the characteristics required by UNI
8065, and comply with laws and regulations in force and the provisions of
EN14868 (protection of metallic materials against corrosion).
The filling water (first filling and subsequent replenishments) must be potable,
clear, with the hardness indicated in the table below and treated with chemical con-
ditioners that prevent encrustations, corrosive or aggressive phenomena on me-
tals and plastics, the formation of gas, and the proliferation of bacterial or microbial
masses in low temperature systems.
The water contained in the system must be checked periodically (at least twice a
year during the seasons of use, as required by UNI8065) and possibly have a clear
appearance and must comply with the limits given in the following table.
* With the use of the conditioners listed below, the limit rises
1200
μ
S/cm
.
It must contain chemical conditioners in a concentration sufficient (180 ml/l) to pro-
tect the system for at least one year. Bacterial or microbial loads must not be pre-
sent in low temperature systems.
Chemical conditioners must ensure complete deoxygenation of the water, contain
specific protection for yellow metals (copper and its alloys), anti-fouling agents for
scale, neutral pH stabilizers and, in low-temperature systems, specific biocides for
use in heating systems.
EXISTING SYSTEM
NEW SYSTEM
WATER PARAMETER
Total filling water hardness (°F)
<10
<10
Total system water hardness (°F)
<15
<10
PH
7 < Ph < 8
Copper Cu (mg/l)
Cu < 0.5 mg/l
Iron Fe (mg/l)
Fe < 0.5 mg/l
Chlorides (mg/l)
Cl < 050 mg/l
Conductivity (
μ
S/cm)
< 600
μ
S/cm*
Sulfates
< 100 mg/l
Nitrates
< 100 mg/l
