Corrosion Protection; System Water Quality; Use Of Additives (E.g. Hardness Stabilsisers, Frost Protective Agents, Sealing Agents) - Potterton Paramount two Installation, Operation & Maintenance Manual

4.2

Corrosion protection

4.3

System water quality

4.4

Use of additives (e.g. hardness stabilsisers, frost protective agents, sealing agents)

PARAMOUNT two 30 - 115 kW
The combustion air must be free from corrosive elements - espe-
cially fluorine and chlorine containing vapours which are found, for
example, in solvents and cleaning agents, propellant gases etc.
When connecting boilers to under-floor heating systems, employ-
ing plastic pipe work which is not impervious to oxygen, heat ex-
changers must be used for separation purposes.
To ensure the boiler heat exchanger remains in good condition it is
essential to condition and monitor the system water to the follo-
wing criteria:
– Water hardness: if the system fill water has a hardness in excess
of 259 mg/l (17,5°Clark) the water should be softened prior to
filling the system to ensure that excessive scaling does not oc-
cur within the heat exchanger.
– Water acidity: the system fill water should have pH value bet-
ween 7 - 8.3 to ensure corrosion of the heat exchanger does not
occur.
– Copper ions: the copper content of the system water should be
less than 0.05 mg/l. If large quantities of copper are present red
and black copper oxide Cu2O and CuO and grey/green copper
carbonate, CuCo will be produced. Copper will corrode any
2
iron and aluminium within the system. A special water treat-
ment company should be consulted if in doubt.
If, in a special case, a need exists to use additives in a mixture
(e.g. hardness stabilser, frost protecion agent, sealing agent,etc.)
it has to be observed that the agents are compatible with each
other and the pH-value is not altered. Preferably, agents from the
same manufacturer should be used.
The instructions of the additive manufacturer have to be observed.
Released additives
Currently, the following agents have been approved by POTTERTON
Commercial:
– "Full heating protection" from Fernox
– "Sentinel 100" from GE Betz
As a single frost protection agent, also Tyfocor® L may be used.
If not approved agents are used, the guarantee becomes void!
When softener facilities are used, water softening to a hardness of
minimum 6 to 8 °dH is recommended.
The pH-value must not exceed the permissable value of 8.3.
Maintenance instructions
The water hardness of the heating water has to be checked within
the scope of the recommended maintenance of the boiler (every
two years) and, possibly, the respective amount of additive has to
be added.
Before installation
17