| 摘要 |
Described is a vehicle heater with several heat-output settings. When heaters of this kind are switched from one setting to another, annoying noises are produced by the actual switching operation and by the rapid change in rpm of the combustion-air fan of the burner in the heater. In order to avoid this, the invention calls for a smooth, gradual change in fan rpm whenever the heater is switched from one output setting to another.
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