ECR International Olsen Q90 125-200 II Series Installation, Operation & Maintenance Manual page 45

Applies to ALL Aluminum High Effi ciency Gas-Fired Water Boilers
Clean the System First
BEFORE connecting boiler to heating system, clean
and fl ush system thoroughly. Verify system is free of
sediment, fl ux and any residual boiler water additives.
Systems having antifreeze not recommended
must be completely fl ushed to ensure no old
antifreeze remains. In older systems obviously
discolored, murky or dirty water; or pH reading
outside acceptable range (between 7.0 and 8.0) are
indications the system should be cleaned or treated.
Thoroughly fl ush system with clean water to remove
any sediment or contaminants. Sludge and iron oxide
deposits can cause rapid breakdown of inhibitors.
Flushing with clean water. If chemical cleaners
are used, use only those recommended for use
with aluminum boilers. Follow chemical cleaner
manufacturer's instructions completely.
DO NOT mix different manufacturer's products.
Fill Water and Chemistry
Verify water used to fi ll system meets these
requirements:
System fl uid pH maintained between 7.0 and 8.0.
Maintain water hardness below 7 grains hardness.
Filling with chlorinated potable water is acceptable.
DO NOT fi ll boiler with water containing chlorine in
excess of 100 ppm.
DO NOT use inhibitors or other additives that are not
listed at the end in this addendum.
Consult local water treatment specialist for
recommendations if any of above requirements is
outside stated ranges.
System and Operating Precautions
Eliminate System Leaks
Continuous addition of make-up water will constantly add
oxygen to system. Eliminate all system leaks. All system
leaks must be repaired immediately.
Verify expansion tank is operational and properly sized.
Undersized expansion tanks cause relief valve weeping and
substantial make-up water addition.
Operation of this boiler in system containing signifi cant
amounts of dissolved oxygen can cause severe heat
exchanger corrosion damage.
This boiler is not designed for use in systems containing
regular additions of make-up water. Regular additions of
make-up water may cause severe heat exchanger damage.
System leaks may not always be visible. An unseen system
leak will become obvious if boiler pressure decreases when
make-up valve is closed.
This boiler is designed for closed loop hydronic heat system
ONLY!
This boiler is not suitable for natural gravity type
installations, or any other open type system.
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