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Noisy Burner/Heater During Operation - Bosch C 950 Installation Manual

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8.7

Noisy burner/heater during operation

1. Sealed combustion leak. Make sure combustion cover is securely
fastened. Ensure the exhaust vent adaptor is properly sealed with
supplied gasket. Leaky seals create improper combustion resulting
in noise.
2. Improper venting. Venting that is unsealed, the wrong material, too
big in diameter or too long in run will result in unstable burner flames
and noise. Ensure venting is in accordance with specifications in
chapter4.3, page 11.
3. Lack of adequate combustion air. Drawing combustion air from a
room area of inadequate size will result in unstable burner flames and
noise. Improper piping of combustion air to the outside or
insufficient space will result in unstable burner flames and noise.
Ensure adequate combustion air is provided from the unit in
accordance with specifications in Section4.4, page 26 Combustion
Air Requirements.
4. Cross contamination. Ensure that intake and exhaust terminations
maintain required clearances as stated in chapter 4.3, page 11.
Cross contamination between intake and exhaust may cause
unstable burner flames and noise.
5. Lack of gas pressure. Inadequate gas pressure will cause the fuel-to-
air mixture (CO
) to be out of adjustment. This will result in unstable
2
burner flames and noise. Ensure gas pressure is in accordance with
specifications in Section4.14, page 36 Measuring Gas Pressure. A
gas pressure reading is needed to proceed further. Contact your
original installer or a local certified gas technician to obtain this
reading.
6. Verify proper CO
readings per chapter7.5, page 43. CO
2
adjustments must be done by a certified gas technician with a
calibrated combustion gas analyzer.
Greentherm
2
Troubleshooting | 49
6 720 805 440 (2014/11)

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