ADC AD22 Installation & Operator's Manual

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ADC AD22 Installation & Operator's Manual Manual pdf 16 page image

16 American Dryer Corp. 113279- 7! WARNING (CE Dryers)This appliance must only be operated with the gastype indicated on the dryer’s data plate. If theappliance is converted (gas type changed), a dataplate amendment must be obtained from AmericanDryer Corporation.Conversions done improperly can result in a fire orexplosion!Gas Pressure TestingFor proper operation, the gas pressure must be correct,consistent and maintained at the gas pressure rates shownon page 14. Provisions are made at the gas valve for takinggas pressure readings.There are two types of devices used to measure gas pressure.They are the spring/mechanical type gauge and themanometer. The use of the spring/mechanical type gauge isnot recommended because they are very easily damagedand are not always accurate. The preferred type of gauge isthe manometer because it is a simple device to use and ishighly accurate. A manometer is simply a glass or transparentplastic tube with a scale graduated in inches or millibar. Whenit is filled with water and pressure is applied, the water in thetube rises, showing the exact gas pressure.Gas Pressure Test ProcedureTurn gas cock in gas supply line to “OFF” position.50 Hz dryers: Back out miniature screw inside pressure tapand attach manometer (refer to the illustration on page 15).60 Hz dryers: Install pressure tap and attach manometer (referto the illustration on page 15).Turn gas cock to “ON” position.Start the dryer in Heat Mode and wait for ignition. Gasmanifold pressure should be as shown on page 14.If the gas pressure needs to be adjusted, refer to “GasPressure Adjustment” on this page.Once test is complete, turn gas cock to “OFF” position.Remove manometer. Tighten screw inside the pressure tapor install plug.Turn gas cock to “ON” position and check for leaks with soapsolution with main burner “ON.”Preparation for Operation / Start-Up _The following items should be checked before attempting tooperate the dryer:• Read all “CAUTION,” “WARNING,” and “DIRECTION”labels attached to the dryer.• Check incoming supply voltage to be sure that it is thesame as indicated on the data label. In the case of 208VAC or 240 VAC, the supply voltage must match theelectric service exactly.• GAS MODELS – Check to ensure that the dryer isconnected to the type of heat/gas indicated on the dryerdata label.• GAS MODELS – Be sure that all gas shutoff valves arein the open position.InstructionsDisconnect electrical power to the dryer.Close all shutoff valves in dryer’s gas supply line.Open the panel located just below the loading door.Locate the gas train and disconnect the union, three electricalplugs, and the gas train mounting screws from the burner.Carefully slide the gas train out of the gas train enclosure.(The carbon ignitor located at the far end of the gas train isvery fragile.)Remove two burner tube mounting screws and remove burnertube in order to gain access to the orifice.Using a 3/8” wrench or socket, remove the existing orificeand replace it with an orifice from the kit.IMPORTANT: Use extreme care when removing andreplacing orifice (injector). This orifice (injector) is made ofbrass, which is easily damaged.Reinstall the burner tube onto the burner base.Select from the following three options, the conversion to beperformed:• Converting from unregulated L.P. to regulatednatural gas: use a flat screwdriver to remove the capwith blocking pin and install the regulator vent cap fromthe kit (ADC P/N 140415).• Converting from unregulated L.P. to unregulatednatural gas: no change to the regulator is required.• Converting from regulated L.P. to regulated naturalgas: remove the white plastic regulator adjustmentscrew (under vent cap). Remove spring under screwand replace with spring from kit (ADC P/N 140415).Replace regulator adjustment screw.Install the gas train back into the dryer gas train enclosure.Be sure the tab at the rear of the gas train engages into themounting slot.Connect the union and the three electrical plugs.Open all shutoff valves, reconnect electrical power to thedryer, and test for leaks.Operate the dryer through one complete cycle to ensureproper operation.With dryer operating, check the manifold (burner) pressureat the tap on the gas valve to ensure proper operatingpressure (refer to chart on page 14).Gas Pressure AdjustmentDisconnect electrical power to the dryer.To adjust gas valve’s internal regulator, remove the regulatorvent cap. Once vent cap is removed, turn the plasticadjustment screw in the valve. Turn the screw clockwise toraise pressure and counterclockwise to lower pressure.Gas (burner) pressures are measured with the burner inoperation for all burner adjustment conditions. Thereforeonce the necessary adjustments have been made, the dryermust be operated in a heating cycle to verify that the pressureis correct. If it is not correct, you must discontinue the powerto the unit and make further adjustments. Repeat these stepsas many times as necessary to achieve the correct burnerpressure. Once the adjustment of the valve is complete, thevent cap must be replaced and sealed with, for example,paint to prevent maladjustment by the user.