Dunkirk 90-50 Installation, Operation & Maintenance Manual page 33

If the system has leaked for some reason, the water and antifreeze
chemistry will need to be adjusted. To avoid damage to the boiler,
check the pH and chemistry of the boiler solution and consult the
antifreeze manufacturer for recommendations.
It is recommended that a pH reading is taken annually, and adjusted
as necessary. Follow antifreeze / inhibitor manufacturer's instruc-
tions for details on how to adjust the pH.
• Use of antifreeze in any boiler will reduce heating capacity as
much as 10-20%. This must be taken into consideration when
sizing the heating system, pumps and expansion tank. Consult
antifreeze manufacturer's literature for specific information on
reduced capacity.
• Using the antifreeze manufacturer's instructions to determine the
Recommended Aluminum Antifreeze
& Inhibitor Suppliers
Interstate Chemical
2797 Freedland Road
P.O. Box 1600 Hermitage, PA 16148-0600
www.interstatechemical.com
Tel: 800-422-2436 Fax: 724-981-8383
Noble Company
PO Box 350 Grand Haven, MI 49417
www.noblecompany.com
Tel: 800-878-5788 Fax: 800-272-1519
Rhomar Water Management, Inc.
PO Box 229 Springfield, MO 65801
www.rhomarwater.com
Tel: 800-543-5975 Fax: 417-862-6410
* These products may be used to adjust the pH level of the hydronic system, but on occasion may not resolve the pH issue. In these
cases it is recommended to flush the system and refill with untreated water and new boiler manufacturer approved antifreeze suitable
for Aluminum heat exchangers.
IMPORTANT: Regardless of antifreeze or inhibitors used, be sure to follow the antifreeze manufacturer's instructions for use, safe
handling and storage of their products. Refer to the MSDS (Material Safety Data Sheets) provided by the antifreeze manufacturer for
potential hazards and first aid procedures for exposure or ingestion.
Antifreeze Testing Services: Each of the recommended antifreeze manufacturers have developed a sampling program available to
the homeowner and contractor. Contact the antifreeze manufacturer regarding their sampling plan procedure. Consult the antifreeze
manufacturer for details on sample requirements and recommendations.
The boiler manufacturer reserves the right to make changes without notice.
WaTer TreaTmenT & freeZe proTeCTion
Intercool NFP-30,40,50 AA
Intercool RPH-15*
Noburst AL Antifreeze
Rhogard Antifreeeze
Pro-Tek 922 Inhibitor*
33
freezing temperature needed and use the correct amount of anti-
freeze. Never exceed 50% antifreeze by volume.
• The boiler operating pressure must remain below 15 psi for anti-
freeze solutions that specify a maximum of 250˚F (121˚C).
Antifreeze solutions can breakdown over time.
Failure to check antifreeze chemistry, includ-
ing inhibitors, annually may result in accel-
erated corrosion of boiler and other system
components. consult with the antifreeze
manufacturer for recommendations.
Recommended Products
NOTICE