Appendix C - Water Quality Standards For Hydronic Boilers In Multi-Metal Systems - Patterson-Kelley P-K MACH CM300 Installation & Owner's Manual

Appendix C – Water 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: January 3, 2020
Released: January 3, 2020
 Patterson-Kelley 2020
All Rights Reserved.
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1004905980 P-K MACH CM300-CM500&C750-C1050
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