Water Treatment - CleaverBrooks CFC-500 Operation, Service And Parts Manual

manufacturer for proper installation and sealing instructions. See
also Chapter 3 of this manual for combustion air and flue gas
venting requirements.
C. WATER TREATMENT
Cleaver-Brooks ClearFire condensing boilers are suitable for heating
systems without significant oxygenation capacity. Systems with
continuous oxygenation capacity due to unknown or unseen leaks
must be equipped with a system separation or pretreatment device.
Untreated drinking water is generally the best heating medium as
filling and make-up water for a system that utilizes the Model CFC.
If the water available from the main system is not suitable for use,
then demineralization and/or treatment with inhibitors is necessary.
Treated filling and make-up water must be checked at least once a
year or more frequently if so specified in the application guidelines
from the inhibitor manufacturer.
Those parts of the boiler in contact with water are manufactured
with ferrous materials and corrosion-resistant stainless steel. The
chloride content of the heating water must not exceed 30 mg/l and
the pH level should be between 8.3 to 9.5 after six weeks of
operation.
To maintain the boiler's efficiency and prevent overheating of the
heating surfaces, the values in Table 2-1 should not be exceeded.
Water make-up during the lifetime of the boiler should not be
greater than 3 times the system volume. A water meter should be
installed on the feed line to monitor makeup water volume.
Following production of the pressure vessel, the interior surfaces are
cleaned and therefore a pre-start boil out of the vessel is not
needed. Should the system require boil out or cleaning after
installation of the CFC, take care that no particulate matter reaches
the boiler during the cleaning process. A removable filter should be
used for this purpose.
Corrosion and sludge deposits in old systems must be removed prior
to installation of a new boiler.
Table 2-1 Model CFC Water Chemistry
Parameter
pH
Chloride
Nitrates
Sulphates
Oxygen
Specific Conductivity
Total Hardness
Part No. 750-263
Notice
Limit
8.3 - 9.5
30 mg/liter
50 mg/liter
50 mg/liter
0.1 mg/liter
3500 umho/cm
<10 ppm
Section 2 — Installation
2-11