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GENERAL
General
Corrosion protection
System Water quality
The Potterton EUROCONDENSE Plus condensing sectional boiler is
available in five sizes with outputs at 60 °C return temperature from 86.7
kW to 237 kW. Table 11 give kW outputs and technical data for each model.
They are CE marked for use on Natural Gas on open vented systems and
they are suitable for use on sealed systems with a maximum operating
pressure of 4 bar (58.8 p.s.i.) Refer to relevant British Standards and Codes
of Practice installation of condensing boilers on sealed system.
The heat exchanger consists of an aluminium - silicon alloy which gives a
very compact and lightweight boiler construction with corrosion resistance
and high efficiency.
The fully pre-mixed burner works in a modulating range of between 35 %
and 100 %. Therefore the boiler output is adapted to the particular heat
requirements of the circuit. The gas / air ratio control ensures uniformly high
CO
emissions and low NOX. This is obtained by comparing the target
2
boiler temperature and the actual temperature from the sensor. If there is a
difference between these two values then the internal microprocessor
calculates a new fan speed. The change in fan speed in turn changes the
combustion chamber static air pressure which is monitored by the gas / air
ratio control and the gas rate is adjusted thus maintaining the correct gas to
air ratio in the boiler. This ensures that a uniform gas / air ratio is maintained
over the total range of the boiler modulation and that constant CO
are achieved.
The gas train assembly, control panel and boiler case must be connected on
site and apart from the incoming supply all other electrical connections are
made by plug and sockets.
For high energy utilisation condensing boilers should be operated at a low
return temperature. However the Eurocondense Plus will also work at
designed temperatures of 70/50 °C in the condensing mode as the return
temperature is under the dew point. (dew point is 53 °C at 8.5 % CO2).
Condensing boiler Series Eurocondense Plus are designed as hot water
heating systems. They correspond to EN 676, EN 677 and Category I2H or
II2H3P, for use in GB.
The combustion air must be free from corrosive elements - especially
fluorine and chlorine containing vapours which are found for example in
solvent and cleaning agents, propellant gases etc. When connecting boilers
to under-floor heating systems employing plastic pipe work which is not
impervious to oxygen, heat exchangers must be used for separation
purposes.
Mains water of drinking quality without additives (chemical additives) must
be used in the primary circuit of the boiler.
To ensure the boiler heat exchanger remains in good condition it is essential
to condition and monitor the system water to the following criteria:
Water Hardness: If the system fill water has a hardness in excess of 250 mg/l
(17.5° Clark) the water should be softened prior to filling the system to
ensure that excessive scaling does not occur within the heat exchanger.
Water Acidity: The system fill water should have a pH value between 7 - 8.5
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, CuCO2 will be
produced. Copper will corrode any iron and aluminium within the system.
A specialist water treatment company should be consulted if in doubt.
Note: The only Inhibitors recommended by Potterton are FERNOX-
COPAL or GRACE DEARBORN-SENTINEL X100
values
2
3
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