Bosch 3931A Operating Instructions - Page 10

BM 1609929K45 08-06 8/14/06 11:42 AM Page 10 WET VACUUMING Your 3931A can also be used for wet vacuuming. ! WARNING Do not use to vacuum flammable liquids, gases, or explosive dusts, like gasoline or other fuels, lighter fluid, varnish, polyurethane coatings, cleaners, oil-based paints, natural gas, hydrogen, coal dust, magnesium dust, grain dust, or gun powder. Electric motors create sparks, which may ignite the dust or fumes. 1. Before wet vacuuming, run the vacuum in the PULSE-CLEAN™ mode. 2. Empty the canister to prevent encrustation when wet vacuuming. If bag is in canister, remove it as well. Notes: • Empty the canister before wet vacuuming. • Do not use a VAC013 dust bag when wet vacuuming. If a bag is to be used when vacuuming wet material, a VAC022 heavyduty bag must be used. • Wet/dry dust: If VAC013 bag is in the canister, remove it as well. (VAC022 bag can remain in canister.) • The filter cartridge must be used when wet vacuuming. • Do not activate the PULSE-CLEAN™ mode when the contents of the vacuum cleaner are wet. • The unit is equipped with water level sensors. The unit switches off when the maximum filling height is reached. The unit still has power, but will not operate. The unit must be first switched off before it can be switched on again. • When the unit is shut off, some water may flow out of the hose. • To prevent siphoning or spillage, lift the suction hose out of the liquid before draining the vacuum cleaner. • Before opening and emptying, move the switch to the OFF position. • Before opening and emptying, always disconnect the vacuum cord from the power supply. • In order to avoid mildew, after wet vacuuming, remove the VAC022 bag (if one is installed) and remove both filter cartridges and allow them to dry thoroughly. Dry the filter and canister thoroughly so that dust cannot adhere to moist parts. Also remove the control unit and allow it to dry, too. • Use a dry filter for subsequent dry vacuuming. We suggest purchasing extra filter cartridges when frequently alternating between wet and dry vacuuming and swap them out as appropriate. Clean the canister and accessories with water. Wipe the top section with a moist cloth. WATER-LEVEL SENSOR MAINTENANCE Clean the water level sensors occasionally: See Figure 6. 1. Unlock the canister latches and remove the control unit. 2. Clean the water level sensors with a soft cloth. 3. Reattach the control unit again 4. Lock the canister latches. FIG. 6 LEVEL SENSORS EMPTYING THE CANISTER 1. Switch the unit off. 2. Disconnect from the power supply. 3. Open the canister latches. 4. Remove control unit. 5. Remove the paper filter bag; dump out the canister, or drain out the canister as appropriate. CANISTER MAINTENANCE Wipe out the canister from time to time with a commercially available, non-scouring cleaning agent and allow to dry. -10-