46
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 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 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.
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
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.
