Appendix C - Water Quality Standards Quality Standards For Hydronic Boilers In Multi-Metal Systems - Patterson-Kelley P-K STORM ST-8000 Installation And Owner's Manual

Appendix C – Water Quality Standards Quality Standards for
Hydronic Boilers in Multi-Metal Systems
Patterson-Kelley boilers are designed to
be incorporated into any multi-metal
hydronic heating system. All multi-metal
hydronic systems require that attention
be paid to water treatment. The
chemical additives for any multi-metal
system must be specifically formulated
for use with all the various metals used
in that system.
Any closed, hydronic heating systems
should include a meter, to monitor water
addition to the recirculating loop, and a
filter, pursuant to ASHRAE Standard
189.1 and the AWT Handbook. Water
added to a closed hydronic system
should not exceed more than 10% of the
system volume per year and meter
readings should be recorded, at least
monthly, to ensure system losses are
minimized and corrective actions shall
be taken when needed.
Treatment programs for multi-metal
systems should meet or exceed the
following generally accepted best
practices water quality guidelines:
Prior to initiating any treatment program,
a water sample of the proposed fill water
should be sampled for analysis. Once
filled and bled of air, a pH neutral,
industrial cleaner for use in multi-metal
systems should be used to clean the
entire hydronic system. Samples of the
system water with cleaner should be
taken and analyzed to ensure proper
cleaner strength. Once cleaned, the
system should be flushed with fresh (fill) water until the system water is within 100 micro Siemens in
conductivity of the fresh water. When flushing is complete, a treatment program that is designed for
use in that multi-metal system, after consideration of the metals it contains, must be used. Treatment
programs should also comply with the standard water quality guidelines listed above.
Revised: February 2, 2024
Released: February 2, 2024
 Patterson-Kelley 2024
All Rights Reserved.
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