Kärcher HDS3.5/20 Operator's Manual

Also see for HDS 3.9/30: Operator's manual Dealer's manual

Contents

9.801-509.0 - C • Karcher Operator's ManualMANUAL PRESSURE WASHER12two inches from combustibles. Vents passing throughenclosed spaces and vents exposed to the weathershould also be the double-wall type. Sometimes ventshave to be built of such great length that they comeapart at their joints under their own weight. Theseshould be screwed together at the joints with sheetmetal screws, usually three per joint. If the inspectorindicates that the vent is too close to combustibles, itmay be necessary to chisel away some of the com-bustible or route the vent pipe around the combustible.The cross-sectional area of any fl ue shall not be lessthat the cross-sectional area of the fl ue vent connec-tion outlet of machine.The pressure washer includes a collar that will matewith standard HVAC ducting. The user will be respon-sible for installation of an exhaust stack. The exhauststack should include a Draft Diverter/Inducer, Damper,Sampling Port and Rain Cap. An adapter can beinstalled between the collar and stack to adjust thediameter from 10” to 8” or 12” to 10”.Size the stack according to the following (see alsoapplicable local and national standards regardinginstallation of gas-fired appliances):• 3.5 to 4.4 gpm 10” Collar 8” Stack• 4.5 to 5.5 gpm 10” Collar 10” Stack• 6.3 gpm 12” Collar 10” Stack• 8 – 10 gpm 12” Collar 12” Stack(Figure 4)Draft Diverter/Hood: The draft required to ventcombustion gases is created by the heat inside thepressure washer coil. A draft diverter helps improvedraft into the stack without pulling more air through thecombustion box and decreasing combustion efficiency.The draft diverter can also help prevent back draftingthat can inhibit combustion. The draft diverter shouldbe installed a minimum of 36” above the fl ue collar.See Figure 4.Power Vent (Draft Inducer): If this machine is goingto be installed on a 90° or extended exhaust vent runlength which may restrict air fl ow it is recommendedthat a contractor install a power vent. When a contrac-tor has found it impossible to vent straight through theroof power venting is recommended to help eliminateexhaust restriction of this natural draft machine. Thisdraft inducer (power vent) must be installed by a li-censed contractor who can calculate size, operationconnections and associated dampeners. Since weare a manufacturer and not a licensed contractor andas such we are unable to make recommendations forsuitable make and model of power vents and compli-ance with local building codes.Damper: An exhaust stack can reduce thermal ef-fi ciency by drawing in too much combustion air. Thiscan be controlled by adding a damper just below thedraft diverter. 8.753-473.0 - 8" Damper, 8.753-474.0-10" Damper, 8.753-418.0 - 12" Damper.NOTE: Closing the damper can create high levels ofCO in the exhaust. Adjustments to the damper shouldonly be performed by a trained technician using a fl uegas analyzer. If an analyzer is not used the dampershould be set in the fully open position.Sampling Port: A port for sampling fl ue gases andmeasuring the fl ue gas temperature should be placed18” above the flue collar. The port should be coveredwhen sampling is not being performed. The size ofthe port should be only slightly larger than the probefor the fl ue gas analyzer.Rain Cap: A rain cap should be installed on top ofthe stack to prevent rain water, leaves and debris fromentering the stack. Your installer may also recommendspecialty caps for high wind areas or cold weatherzones to help prevent back drafting. 8.717-731.0 - 10"Raincap, 8.717-732.0 - 12" Raincap.Water Source:The water source for the machine should be suppliedby a 5/8" I.D. garden hose with a city water pressure ofnot less than 30 PSI. If the water supply is inadequate,or if the garden hose is kinked, the machine will runvery rough and the burner will not fi re.Water Connection:Connect the high pressure hose by pulling the couplercol lar back and then inserting it onto the dischargenipple. Se cure it by pushing the collar forward.Attach the wand into the spray gun using tefl on tapeon the pipe threads to avoid leaks.INSTALLATIONIllustration showing air openings necessaryto supply air for combustion when installedin an enclosed room.Figure 3: VentilationDraft DiverterRequired8.717-728.0 8"9.801-040.0 10"8.717-730.0 12"