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To minimize the risk of premature heat exchanger failure, observe the following water chemistry
1) Minimize the introduction of make-up water, dissolved oxygen, and contaminants into the boiler by
following the installation guidelines shown in the Water Quality and Boiler Water Additives Note on Page 64.
2) Make sure the system is lled with water meeting the following criteria:
• pH between 6.5 and 9.5 (for systems containing aluminum components, between 6.5 and 8.5)
• Chloride level less than 200PPM. If ll water is drawn from a system containing a water
softener, test a sample of the ll water to con rm that this criteria is met.
• Hardness less than 7 grains/gallon.
3) Avoid the use of petroleum based boiler additives. These can attack seals in both the boiler and system.
4) If freeze protection is required, use the following or its equivalent:
Fernox Alphi -11 (inhibited Propylene Glycol) available from Alent plc Consumer Products Division,
4100 6th Avenue, Altoona PA. (972) 547 6002 (fernox_usa@alent.com).
Refer to the antifreeze manufacturer’s instructions for required dosage. In general these products are a
blend of glycol (for freeze protection) and inhibitors (to protect the glycol from attacking metallic system
components). Do not add any more antifreeze than is necessary to protect the system from freeze damage.
Many of these products require annual testing of the system water to ensure that the inhibitors are still
active; consult the manufacturer’s instructions for maintenance requirements. Allowance must be made for
the additional expansion of the glycol solution.
5) For system cleaning, use the following or its equivalent:
Fernox Cleaner F3 available from Alent plc Consumer Products Division, 4100 6th Avenue, Altoona PA.
(972) 547 6002 (fernox_usa@alent.com).
Refer to the instructions supplied with the cleaner for proper dosage and use.
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