Lennox International Inc GWB9-075IH-2, GWB9-100IH-2 General Guidelines When Using Antifreeze

System and Operating Precautions

Applies to ALL Aluminum High Efficiency 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 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.

•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 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.

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