Kärcher HDS4.0/22 Dealer's Manual

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

Contents

17Operationsdrafting that can inhibit combustion. The draft divertershould be installed a minimum of 36” above the fluecollar.Power Vent (Draft Inducer): If this machine is going tobe installed on a 90° or extended exhaust vent runlength which may restrict air flow it is recommendedthat a contractor install a power vent. When acontractor has found it impossible to vent straightthrough the roof power venting is recommended tohelp eliminate exhaust restriction of this natural draftmachine. This draft inducer (power vent) must beinstalled by a licensed contractor who can calculatesize, operation connections and associated damp-eners. Since we are a manufacturer and not a licensedcontractor and as such we are unable to make recom-mendations for suitable make and model of powervents and compliance with local building codes.Damper: An exhaust stack can reduce thermal effi-ciency by drawing in too much combustion air. This canbe controlled by adding a damper just below the draftdiverter. 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 fluegas analyzer. If an analyzer is not used the dampershould be set in the fully open position.Sampling Port: A port for sampling flue gases andmeasuring the flue gas temperature should be placed18” above the flue collar. The port should be coveredwhen sampling is not being performed. The size of theport should be only slightly larger than the probe for theflue gas analyzer.Rain Cap: A rain cap should be installed on top of thestack 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" RaincapWater 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 fire.Water Connection:Connect the high pressure hose by pulling the couplercollar back and then inserting it onto the dischargenipple. Secure it by pushing the collar forward.Attach the wand into the spray gun using teflon tape onthe pipe threads to avoid leaks.Inspection and Testing Gas Piping:The building structure should not be weakened byinstalling the gas piping. The piping should not besupported by other piping, but should be firmlysupported with gas hooks, straps, bands or hangers.Butt or lap welded pipe should not be run through or inan air duct or clothes chute.Before turning gas under pressure into piping, allopenings from which gas can escape should be closed.Immediately after turning on gas, the system should bechecked for leaks. This can be done by watching the1/2 cubic foot test dial for 5 minutes for any movementor by soaping each pipe connection and watching forbubbles. If a leak is found, make the necessary repairsand repeat the above test.Defective pipes or fittings should be replaced and notrepaired. Never use a flame or fire in any form to locategas leaks — use a soap solution.After the piping and meter have been checkedcompletely, purge the system of air. DO NOT bleed theair inside an enclosed room.During pressure testing of the system at test pressuresin excess of 1/2 PSIG, the pressure washer and its indi-vidual shut-off valve must be disconnected from gassupply piping system or damage to the gas valve willoccur.Gas Pressure:The incoming gas pressure must be a minimum of 9.0wc-in and must not exceed 13.8 wc-in or ½ psig to thecontrol valve. Line pressure above ½ psig must beregulated prior to the machine. The ideal supplypressure is 13.0-13.5 wc-in. If the required BTU inputcan not be achieved consult the factory for instructionsregarding changes to the nozzle orifice size and anappropriate manifold setting.NOTE: Any changes to the burner and manifoldpressure setting should only be performed by atrained technician and adjusted using a flue gasanalyzer.The manifold pressure has been preset at the factoryaccording to the table below for optimum operation atsea-level. The manifold pressure and BTU input will belisted on the specification plate for the machine.Karcher Liberty HDS Stationary Dealer’s Manual 9.801-508.0 - AY