Lime and chalk can be formed according to the working type of
boiler. Radiators must be heated in min. efficiency with enough
water flow. In cascade systems, all boilers must be worked same
capacity, otherwise chalk and lime may condensed in one boiler.
All plumbing system pipes must be check against leakage before
operating the boiler.
The water quantity in the system, should be determinate by heating
project engineer.
The system should be filled with mains cold water (usually have a pH of between 7 and 8).Pressurized installations
with a boiler / system content ratio of 1:10 or less should not require water
treatment.
All scale deposits will reduce the efficiency of the boiler and should be prevented. However provided the above is
complied with any scale produced will not be too detrimental to the boiler efficiency and will not reduce the
anticipated life expectancy of the boiler.
Take advice on the suitability of inhibitors for use with aluminum boilers MAX pH of 8.5 when using additives (max.
pH of 9 without additives).
Water Quality
Regarding to quality of water used in central heating and boiler systems, some institutions published instructions as
well as VDI Directive 2035, DIN EN 14868 Standard. According to these instructions, for heating systems with
maximum 100
o
C operating temperature, to avoid accumulation of lime (calcium carbonate), below reference
values of water quality are valid;
Total Heating Capacity (kW)
Hardness
(°F)
≤ 50
None
50 - 200
≤
20
200 - 600
≤
15
> 600
< 0,2
Water Rate
Boiler Type
Min. Water Rate (m³/h
)
Max
. Water Rate (m³/h
)
303
2,9
5
304
4,1
7
305
5,2
9
306
6,6
11
307
8,2
13
Condensate Discharge
Unload the condensed water with a pipe, directly into a
drain. Only use plastic material for the connecting piping,
because of the acidity (pH 2 - 5) .(R 3/4 "). Condensing
discharge into an outside gutter, because of the freezing
risk.
Summary of Contents for ONGAS 300/W Series
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