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System and Operating Precautions
Applies to ALL Aluminum High Effi ciency Gas-Fired Water Boilers
General Guidelines When Using Antifreeze
• Use only antifreeze products recommended
for use with aluminum boilers, as listed in
this addendum. See Table 11.
• 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 11 for allowable products.)
• Always clean system prior to using antifreeze as
stated in this supplement.
• 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 fi rst 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.
• Recommend taking pH reading 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 specifi c 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.