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 WASHER26MAINTENANCE & SERVICEGas Valve Regulator AdjustmentGAS VALVE REGULATORADJUSTMENTAdjustment of the built-in regulator isn’t normally nec-essary, since it is preset at the factory. However, fi eldadjustment may be accomplished as follows:1. Attach manometer at pressure tap port.2. Remove regulator adjustment screw cap.3. With a small screwdriver, rotate the adjustmentscrew clockwise to increase or counterclockwiseto decrease gas pressure.4. Replace regulator adjustment screw cap (seeFigure 5).Figure 5Pressure Relief ValveEach machine is equipped with a relief valve to relievepressure in the system when higher than normaloperating pressures are encountered. If operatingpressure of machine is found to be normal and reliefvalve continues to leak, repair or replace the valve.CAUTION: Relief valve can become obstructed bydeposits and must be unscrewed at least once peryear to allow discharge.PROPANE GASGeneral Safety PrecautionsHave a qualified gas service person assist in any gasburner installation or service. Few maintenance peopleor mechanics are knowledgeable in gas controls orrelated safety practices. Propane gas is heavier thanair; unburned propane gas will gravitate to the fl oorrather than rise out of the stack. Hence, adequate floorspace and good ventilation are especially importantwith propane systems.Gas Pressure RequirementsAll propane fi red machines operate on vapor propanefuel only. They are designed to operate at a pressure of11 w.c.i. (between 1/3 and 1/2 of one psi), and areoften operated at even higher pressures when extraheat is needed.Exterior regulators are needed to control gas pressure.Propane bottles are not included with the machine. Apressure regulator should be installed between pro-pane bottle and gas valve.Propane Cylinder CapacityAn important consideration with propane systems isthe capacity of the supply cylinder relative to the needsof the burner. The burner operates on propane as avapor gas. As gas is used from the propane cylinder,the liquid in the cylinder boils to maintain vapor gaspressure. This boiling process cools the liquid, and ina heavy, continuous-demand situation, the liquid tem-perature can fall to the point at which it cannot providevapor gas as rapidly as is needed. In this case, it maybe necessary to warm the propane cylinder by direct-ing a warm spray, not over 120°F, on the cold cylinderor by manifolding two propane bottles together to in-crease total vaporization capacity. It is recommendedthat a minimum 100 lb. vapor propane bottle be usedon the machine, depending on the length of runningtime desired.BURNER FEATURESOperated Automatic ValveThis machine is equipped with an Intermittent PilotIgnition System. This system is designed to eliminatethe need for a constant burning pilot. Lighting of thepilot is accomplished through electronic spark ignitioneach time the burner switch is turned on. Do not at-tempt to light the appliance manually as a burn injuryor electrical shock may result. The pilot light will remainon and the main gas valve is turned off when the spraygun is closed.Care of Main BurnerDue to condensation from heater coils dripping downon the burners, scale build-up may occur in the burnerjet orifi ces.1. TO REMOVE BURNER MANIFOLD FROMWATER HEATER COIL:Turn off the gas to the main burner by turning theknob to the “OFF” position on the gas valve andthe main gas supply.Disconnect the pilot and ignition lines from the gasvalve. Disconnect union in main burner line belowthermostat. Slide burner manifold out through shellopening.On/OffSwitchInlet ViewOutletManifold PressureAdjustment ScrewUnder CapGas ValveRegulatorAdjustmentLines ToPilot Light98015080-26