26 English2 Indicator lamp for fuel shortage(not HDS 551 C Eco)3 Liquid softner indicator lamp(not HDS 551 C Eco)4 “Ready for use” indicator lamp5 Indicator lamp for detergent(not HDS 551 C Eco)6 Indicator lamp exhaust temperature lim-iterFigure 1 - Pos. 5Push down cover lock with screw driver orcoin, to open twist counterclockwise Twistclockwise to lockFigure 1 - Pos. 13Storage compartment for accessories(under the appliance hood)– Steam nozzle (4.766-023) optionalAll subsequent specified position numbers inthis operating instruction are listed in the de-vice illustrationCleaning of: Machines, Vehicles, Structures,Tools, Facades, Terraces, Gardening tools,etc. DangerRisk of injury! Follow the respective safetyregulations when operating at gas stationsor other dangerous areas.– While reducing the water supply at thepump head or with the Servopress - reg-ulation the overflow valve opens and partof the water flows back to the pump suckside.– If the hand-spray gun is closed, so thatthe whole water flows back to the pumpsuck side, the pressure switch at theoverflow valve shuts down the pump.– If the hand spray gun is opened, thepressure switch on the cylinder headturns the pump back on.The overflow valve is set by the manufactur-er and sealed. Setting only by customerservice.– The pressure switch turns the device offwhen the handgun is closed and switchon when the handgun is opened.– The safety valve opens, when the over-flow valve resp. the pressure switch isbroken.The safety valve is set by the manufacturerand sealed. Setting only by customer serv-ice.– The water shortage safeguard preventsthe burner to be turned on when there iswater shortage.– A sieve prevents the contamination ofthe safeguard and must be cleaned reg-ulary.Indication toward operatinginstructionsProper usePlease do not let mineral oil contaminat-ed waste water reach soil, water or thesewage system. Perform engine cleaningand bottom cleaning therefore only onspecified places with an oil trap.Safety DevicesOverflow valve with two pressureswitchesOnly HDS 558.../601.../698.../798...Pressure switchHDS 551 C Eco onlySafety valveWater shortage safeguard