Dunkirk Q95M-200 Modulating Condensing Boiler - Manual (Page 3)

3
System and Operating Precautions
Applies to ALL Aluminum High Effi ciency Gas-Fired Water Boilers
!
WARNING
General Guidelines When Using
Antifreeze
Use only antifreeze products •
recommended for use with
aluminum boilers, as listed in this
addendum. See Table 1.
Continuous addition of make-up water
•
will dilute power of antifreeze and
change buffers ability to maintain pH.
Flush old antifreeze from system.
•
Flush boiler and system separately.
Do not use antifreeze unless required.
•
Antifreeze, if needed, must be of •
type listed on next page due to
their operational characteristics of :
type 356 T6 aluminum at operating
temperatures between 20°F (-6.7°C)
and 250°F (121°C). (See Table 1 for
allowable products.)
Always clean system prior to
•
using antifreeze as stated in this
supplement.
Be sure to follow antifreeze
•
manufacturer’s instructions for use,
safe handling and storage of their
products. Refer to MSDS (Material
Safety Data Sheets) provided by
antifreeze manufacturer for potential
hazards and first aid procedures for
exposure or ingestion.
Antifreeze will raise pH of hydronic
•
solution in heating system above
recommended level due to corrosion
inhibitors. Solution must be treated to
maintain a pH within recommended
level. Follow antifreeze manufacturer’s
instructions to adjust pH.
If system has leaked, water and antifreeze •
chemistry will need to be adjusted. To avoid
damage to boiler, check pH and chemistry
of boiler solution and consult the antifreeze
manufacturer for recommendations.
It is recommended that pH reading be
•
taken annually, and adjusted as necessary.
Follow antifreeze/inhibitor manufacturer’s
instructions for details on how to adjust pH.
Antifreeze solutions can break down over
•
time. Failure to check antifreeze chemistry
on annual basis may result in accelerated
corrosion of boiler and other system
components. Consult with antifreeze
manufacturer for recommendations.
Use of antifreeze in any boiler will reduce
•
heating capacity as much as 10-20%. Take
into consideration when sizing heating
system, pumps and expansion tank. Consult
antifreeze manufacturer’s literature for
specific information on reduced capacity.
Using antifreeze manufacturer’s instructions,
•
determine freezing temperature needed and
use correct amount of antifreeze. Never
exceed 50% antifreeze by volume.
Boiler operating pressure must remain below
•
15 psi for antifreeze solutions that specify
a maximum of 250°F (121°C). Otherwise,
increase system operating/tank pressure to
20 psig. Note: Refer to expansion tank
manufacturer instructions for adjusting
tank pressure.