P-K MACH
®
Gas Fired Boiler
Technical Service 1.877.728.5351
Revised: January 3, 2020
Released: January 3, 2020
Patterson-Kelley 2020
All Rights Reserved.
1004905981 P-K MACH C1500H-C4000 Installation and
Owners Manual (Rev F Jan-2020).docx
Page 116
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.
