Rima ONGAS MEGA 05, Installation Manual

Page: 38 / 60

38
In addition, authorized services shall measure the hardness value of the installation water
while commissioning the boiler and condition the water by adding a “chemical additive”
in accordance with this hardness value. The chemical protective additive sample for
delaying the calcification is sent free of charge by the manufacturer in the packaging of
the boiler. Then, in case of addition of fresh water to installation water; the chemical
additive shall be requested from the manufacturer for a fee.
(If water level in the installation is reduced, fresh water to be added to the installation
shall be supplied together with chemical additives. Chemical additive is sold in our dealers
in 5-liter packages.)
Sediment: Particles that cause sediment in the water piping accumulate on the heat transfer surfaces
in the form of a sludge layer where the flow of water slows down, thus preventing
circulation of water and slowing the heat transfer.
A sediment trap shall be used instead of sieve and cartridge type filters, to remove
materials that cause sediment. Water cannot pass through these filters when the surfaces of
the sieve/cartridge type filters are filled with sediment in the water, and this causes the
boiler to operate without water, overheat and thus causes calcification. In sediment traps,
however, the sediment settles in the form of sludge and water continues to pass from the
top. The sediment traps are required to be cleaned periodically; but cleaning periods are
much longer than sieve/cartridge type filters.
Instructions have been issued by various organizations on the quality of the water used in the heating
and boiler systems; e.g. VDI Directive 2035, DIN EN 14868 Standard of German Norm Institute, Data
Sheets VdTUV 1453 and 1466, Commission for Steam Boilers TRD611…
According to these instructions, the following reference values apply to prevent excessive build-up of
lime (calcium carbonate) in heating systems with operating temperatures up to 100°C;
VDI Directive 2035 “Prevention of damage to hot water heating systems - formation of boiler stones
in domestic water and hot water heating systems” (also refer to the original text of the regulation):
In cases where these conditions are not met, the filling and additional water of the boilers shall be
softened. The cost of water treatment is in any case less than the cost of the repairing of the damages
in the boiler system. Damages caused by corrosion and calcification are not covered by the warranty.
5.1.2. Water pressure: In high buildings, the pressure may exceed 6 bar, particularly when the water
is heated, and cause the relief valve on the boiler to open. In such a case, water with the lost amount
shall be added to the installation. This reduces the effect of water conditioning previously performed,
causing calcification or corrosion by oxygen.