Water Treatment & Freeze Protection - Dunkirk 90-50 Installation, Operation & Maintenance Manual

When filling the boiler water is the preferred heating solution. Most
potable water supplies may be used to charge and re-fill provided the
chlorine and chloride ions levels are less than 100 ppm.
Antifreeze may be used in most applications provided all of the fol-
lowing conditions are met:
Unless a strict schedule of sampling, analysis and maintenance
1.
of the antifreeze solution is followed, the boiler must be piped
as a primary loop connected to secondary loop as shown in the
Piping & Wiring Diagram Appendix. Failure to perform regular
maintenance to the antifreeze manufacturer's instructions will
result in damage to the heat exchanger and the voiding of boiler
warranty.
Only the antifreeze manufacturers listed below are selected.
2.
At installation of a new or replacement boiler and at least on
3.
an annual basis the system antifreeze must be analyzed by the
antifreeze supplier or their recommended laboratory.
Adjustments to the system antifreeze must be made according
4.
to the antifreeze manufacturers recommendations using only
their recommended products.
All existing systems MUST be flushed of ALL old system fluid.
5.
Failure to do so may void the boiler warranty if evidence of im-
proper flushing is revealed. Consult with your heating profes-
sional for recommendations.
piping recommendations
System leaks may not always be visible. An unseen system leak will
become obvious if boiler pressure decreases when make up valve is
closed.
All system leaks must be repaired immediately. Constant introduc-
tion of make up water will introduce dissolved oxygen, resulting in
accelerated boiler corrosion.
It is recommended that Primary/Secondary piping be used with any
of the recommended antifreeze solutions found in this manual. See
the Piping & Wiring Diagram Appendix.
Water Chemistry
This boiler is designed for a closed loop hydronic heat system ONLY!
This boiler is not suitable for natural gravity type installations, or any
other open type system.
System fluid pH must be maintained between 7.0 and 8.0.
Maintain water hardness below 7 grains hardness.
Filling with chlorinated fresh water should be acceptable since
drinking water chlorine levels are typically less than 5 ppm. Do not
fill boiler with water containing chlorine and chloride ions levels
greater than 100 ppm.
Do not use inhibitors or other additives that are not specifically ap-
proved by the antifreeze manufacturer for this product.
Consult the antifreeze manufacturer if any of the above are outside
the stated ranges.
WaTer TreaTmenT & freeZe proTeCTion
Cleaning the Hydronic system
IMPORTANT: Do not mix different manufacturers'
products. Doing so will void the warranty of the boiler.
Consideration MUST be given to cleaning the heating system,
particularly in retrofit situations where a new boiler with an
aluminum heat exchanger is being installed in an existing piping
system.
All existing systems must be cleaned and flushed according to the
antifreeze manufacturer's recommendations.
Systems that have antifreeze that is not recommended by the boiler
manufacturer must be completely flushed to ensure no unapproved
antifreeze remains according to the recommended antifreeze
manufactures recommendations. Evidence of an alternate antifreeze
in the system may void the boiler warranty.
In older systems obviously discolored, murky or dirty water; or a pH
reading outside the boiler manufacturer's stated acceptable range
(pH 7.0 to 8.0) are indications that the system should be cleaned or
treated.
1.
2.
3.
freeze protection
Aluminum Safe Antifreeze, Treatments and Additive
Guidelines:
Antifreeze, if required, must be one of the antifreeze manufacturers
listed in this manual. See the "Recommended Aluminum Antifreeze
& Inhibitor Suppliers" section of this manual for a list of boiler
manufacturer approved products.
Always clean system prior to using antifreeze, refer to the Cleaning
the Hydronic System section of this manual for details.
Only use the antifreeze manufacturers' products outlined in this
document.
Use of antifreeze must be in accordance with local plumbing codes.
Dispose of old antifreeze and boiler system water in accordance with
local authorities.
Antifreeze will raise the pH of the hydronic solution in
a heating system above the recommended level due to
the corrosion inhibitors in the antifreeze. The solution
must be treated to maintain a pH within the boiler manufacturer's
recommended level to avoid damage to the heat exchanger. Follow
antifreeze manufacturer's instructions for details on how to adjust
the pH.
32
Measure total capacity of the system including the piping,
tanks, boiler, collector plates, etc. The most accurate method
of measuring fluid capacity is to fill the system and then
completely drain it, volumetrically measuring the fluid drained.
Thoroughly flush the system with clean water to remove any
sediment or contaminants. Sludge and iron oxide deposits can
cause rapid breakdown of inhibitors.
Cleaning fluid – Flushing with clean water is preferred. If
cleaning fluid is used, only use cleaner specifically approved for
use with aluminum boilers. Use only cleaning fluids and the
procedure recommended by the antifreeze manufacturer.