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Appendix D: Technical Notes

Note 1: Several factors affect combustion efficiency. Dirty or clogged air filters

reduce the amount of air available for combustion therefore reducing efficiency.

Obstructions in the flue block exhaust gases and alter the air mixture in the

combustion chamber which reduces efficiency. Air leaks in the combustion

chamber also alter the mixture causing decreased efficiency.

Note 2: The primary way to affect change in combustion efficiency when work-

ing with modern gas fired equipment is through gas manifold pressure adjust-

ment. Confirm manifold pressures are within maufacturers specifications prior

to performing a combustion test. Once manifold pressures are within limits a

combustion test can be performed to provide information regarding any adjust-

ments that may be needed.

Note 3: Gross efficiency calculation takes into account wet losses (latent heat)

and is the unit of measure used in the USA. Net efficiency only takes into

account dry losses (latent heat is not figured in) and is used in Europe.

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