Dunkirk Q95M-200 Modulating Condensing Boiler - Manual (Page 2)

2
System and Operating Precautions
Applies to ALL Aluminum High Effi ciency Gas-Fired Water Boilers
!
WARNING
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.
!
WARNING
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.
!
WARNING
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.