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System and Operating Precautions
Applies to ALL Aluminum High Effi ciency Gas-Fired Water Boilers
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.
DO NOT use stop leak compounds. Leaks in threaded
connections in aluminum boiler sections must be repaired
immediately. Aluminum threads will not seal themselves.
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.
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
in this addendum.
Consult local water treatment specialist for
recommendations if any of above requirements is outside
stated ranges.
Clean 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.