will not. Disconnect the motor from the GARN® controls and remove the draft inducer assembly from its housing. Clean the motor, blower wheel, etc, install a new full-face gasket and reassemble. 3) A defective bearing, generally due to overheating as a result of using a “donut gasket” in lieu of a GARN® full face gasket. Disconnect the motor from the GARN® controls and remove the draft inducer assembly from its housing. Replace the motor, reinstall the blower wheel with anti-seize compound, install a new full-face gasket and reassemble. Puffing During Operation Puffing or pulsing during operation is a condition that you will surely notice when it occurs. It is the result of an incorrect fuel air mixture. This condition occasionally develops in all wood equipment. Excessive or long term puffing could damage the unit and may create hazardous conditions. Reasons for puffing are: 1) Excessively dry wood fuel such as wood that is more than 2 years dry, construction or furniture scrap, wood without bark, wood that has been stored for an extended period of time indoors, etc. Fuel with a moisture content of 15% to 20% (one year dry) is best for a GARN® unit. 2) “Punky wood” wood that has been drying for so long that it is beginning to decompose internally (usually very light to handle). Fuel with a moisture content of 15% to 20% (one year dry) is best for a GARN® unit. 3) Wood fuel that has an excessively large surface area in relationship to its volume (i.e. small sticks, leaves, small wood scraps, etc). Because all wood burners are surface burners, the surface to volume ratio of the fuel is critical for any burner. For the GARN® unit wood cut 24” to 32” long x 6” diameter is considered best. Longer lengths should be cut and larger diameter logs should be split. 4) Lack of sufficient combustion air normally caused by a partially blocked air inlet hood or flue tubes. Sometimes cause by the installation of an improper air inlet hood (too small) or no inlet air hood. Generally easily corrected by clearing blocked passages or installing the correct hood. 5) Wood fuel positioned too close to the primary air nozzle . A hot fire in this position excessively preheats the primary combustion air, yielding a flash then no-flash combustion condition. To reduce this sensation, push the fire further back into the combustion chamber with a hoe or rake. This also allows the combustion air to disperse more widely at a lower velocity over the woodpile. 6) Starting the fire with an overabundance of kindling .
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GARN® WHS 1000 and WHS 2000 Manual | © HY-C® Company LLC | October 2024
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