TS-7: Combustion Noises

Do you hear the harmonics on light-off?

Yes No
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#B6

Has the boiler been cleaned within the lst 2 years?

Yes No See PHNTM Cleaning Guide
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#B11

Check static gas pressure and verify the pressure is within spec.

Yes No See Spec Pressure
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#B15

Do you hear the harmonics when the unit fires to high fire only?

Yes No
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#B23

Clean boiler. Was problem resolved?

Yes No
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#B28

If boiler is not in high fire place the boiler into high fire entering the “Manual Control” button on the control and choose high fire.

Next
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#I6

Connect manometer to inlet port on the gas valve

OK
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#I11

Make repairs to maintain proper pressures. Did problem resolve?

Yes No
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#I15

When the gas valve opens does the pressure drop more than 1.5″ – 2?

Yes No
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#I19

Check incoming gas pressure to the gas valve in high fire. Is pressure within spec?

Next
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#I23

Perform a combustion analysis in high fire. Use the attached charts for O2 and CO spec’s for guidance. Is the burner within spec?

Yes No See Spec
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#P6

Replace gas valve

Main Menu
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#P14

Make repairs to maintain proper gas pressures. Possible pipe size or regulator issue. Did the noise resolve?

Yes No
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#O23

Disconnect the hose on the sump pressure switch and attach your monometer. Is the reading less than 0.05 or negative?

Yes No
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#O29

If the vent termination is easily accesable, use electrical tape and put an “X” over the opening of the vent. Then add a third piece of tape through the center of the “X”. Did the harmonics go away?

Yes No
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#O37

Was boiler cleaned within the last year?

Yes No
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#O44

Clean boiler

Done
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#O47

Turn the Throttling screw Counter-clockwise to decrease the O2 and Clockwise to Raise the O2. Do not turn it more than 1/4 turn at a time. Shoot for a midrange adjustment on the O2. If already within spec try going lower with the O2 but stay within range. Does burner get within range?

Yes No
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#W6

Try replacing the burner tube. This is not a guanteed fix.

Done
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#U23

Is this boiler an 80 or 100 thousand btu input?

Yes No
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#U29

Replace the vent with the 2″ vent Kit from Velocity Boiler Works.

Done
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#Z29

Re-fire the boiler. Did the noise go away?

Yes No No-Return to high fire troubleshooting
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#AF6

Go back into the manual modulation screen and change to low fire.

Done
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#AM6

On the gas valve there is an offset adjustment. Using a 2mm Allen wrench you will need to turn an allen screw. Turn it Counter-Clockwise to raise the O2 and Clockwise to lower the O2. This is opposite the Throttle screw. Also use your patience. The fan is moving a very small amount of air. Do not turn more than 1/8 turn at a time. Wait for the combustion analyzer to record the change in O2 and stop changing before you re-adjust the offset. Turning it too much may damage the gas valve. Try to get close to the high fire O2 with this adjustment. When complete turn the boiler off and back on. Did the noise go away?

Yes No See Offset
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#AS6

Call Tech Support

Done
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#BD6

PHNTM – Boilers 80 – 120

PHNTM – Boilers 150 – 180

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#AJ75

K2-WT LP and Natural Gas

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#A99

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#AK176