Monthly Preventative Maintenance; Semi-Annually; Annually - Patterson-Kelley P-K MACH CM300 Installation & Owner's Manual

6.1.3 Monthly Preventative Maintenance

1. Press the "Info" button on the NURO touch screen to load the Information Screen and scroll
down to view the flame signal measured in Volts. Typical flame signals should read between
20-50V. If the flame signal is below 20V, the ignition electrode may need to be replaced.
2. Test the low water level cut-off. Refer to Section
3. Test the manual reset high-temp limit. Refer to Section
4. Test low gas pressure switch. Refer to Section
5. Test operating temperature controls by reducing or increasing temperature setting as necessary
to check burner operation.
6. Check the condensate drain system. Clean and flush as necessary.
Installation and service must be performed by a qualified installer or service agency that has been
trained on the P-K MACH

6.1.4 Semi-Annually

In addition to the recommended monthly service:
1. Clean burner of any accumulated dust or lint. Refer to Section 6.2.
2. Inspect burner for any signs of deterioration or corrosion. Replace immediately if deterioration
or corrosion is evident.
3. Check the pH level of the system fluid. Verify the pH is in accordance with
Water Quality Standards for Hydronic Boilers in Multi-Metal Systems.
4. Inspect and clean the condensate system and check for leaks. If a condensate neutralization kit
is present, open the lid and inspect the limestone rocks. If they are absent or have been
significantly worn away, replace them with new limestone rocks. Use high-calcium (or pure)
limestone.

6.1.5 Annually

In addition to the recommended monthly and semi-annual service:
1. Inspect and clean the inlet screen of any accumulated dust or lint.
2. Check burner and clean off any soot or foreign material that may have accumulated. Refer to
Section 6.2. Check for corrosion of the burner and its parts. If there is evidence of deterioration
or corrosion, replace immediately. Inspect combustion chamber when the burner is removed for
inspection. Note any signs of deterioration. Clean as necessary.
3. Inspect and clean heat exchanger. Remove the various covers to inspect the flue gas
passageways. Clean the combustion side casting pins by flushing with clean water and blowing
dry with compressed air. Do not use any cleaning agents or solvents. Do not use soap. A soft
nylon brush may be used in accessible areas. Be sure to inspect condensate collection pan
that is the lowest part of the heat exchanger.
4. Replace the ignition electrode and gasket.
5. Drain and flush the water side of the heat exchanger as required (separate from system flush)
using clean water only.
6. Take a sample of system fluid and verify the water quality is in compliance as defined in
Appendix C – Water Quality Standards for Hydronic Boilers in Multi-Metal
Revised: January 3, 2020
Released: January 3, 2020
N
OTICE
®
boiler.
 Patterson-Kelley 2020
All Rights Reserved.
P-K MACH
Technical Service 1.877.728.5351
3.10.2.
3.10.3.
3.10.4.
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1004905980 P-K MACH CM300-CM500&C750-C1050
Installation and Owners Manual (Rev F Jan-2020).docx
®
Gas Fired Boiler
Appendix C –
Systems.
Page 61