Dunkirk Q95M-200 Modulating Condensing Boiler - Manual (Page 46)

46
System and Operating Precautions
Applies to ALL Aluminum High Efficiency 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.
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 significant
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. 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 fill system meets these requirements:
System fluid pH maintained between 7.0 and 8.0.
Maintain water hardness below 7 grains hardness.
Filling with chlorinated potable water is acceptable. DO
NOT fill boiler with water containing chlorine in excess of
100 ppm.
DO NOT use inhibitors or other additives that are not listed
at end 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
flush system thoroughly. Verify system is free of sediment,
flux and any residual boiler water additives.
Systems having not recommended antifreeze must be
completely flushed 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 system should be cleaned or treated.
Thoroughly flush 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.
APPENDIX B - WATER QUALITY, WATER TREATMENT AND FREEZE PROTECTION