L.B. White FUEL HD120 Owner's Manual

Contents

18GAUGE 00764NIPPLE, 1/2 INLOHITEE, 1/2 INBUSHING, 1/4 IN X 1/8 INBUSHING, 1/2 IN X 1/4 INGAS CONTROLGAUGE 00764OFFONOUTLETPRESSURETAP05102025303515ATTENTION■ The following explains a typical procedure to be followedin checking gas pressures.■ Consult the dataplate on the heater or page 4 in thismanual for specific pressures to be used in conjunctionwith this procedure. The gas pressures will varydepending upon fuel type.■ Gas pressure measured at the inlet to the gas valve isInlet Pressure and gas pressure measured at the outletof the gas valve is Burner Manifold Pressure.MATERIALS REQUIRED(To be secured through local purchase)QQuuaannttiittyy DDeessccrriippttiioonn2 Gas pressure gauges capable of readingup to 35 in. W.C. (may also be orderedfrom L.B. White, part number 00764)1 1/2 in. Tee1 Bushing, 1/2 in. x 1/41 Bushing, 1/4 in. x 1/8A. PPreparation1. Disconnect the heater from the electrical supply andclose the fuel supply valve to the heater inlet.2. Remove gas hose and sediment trap from heater.3. Assemble the hardware components together asshown in Fig. 14.4. Open the case access panel at gas inlet end ofheater.5. Brush or blow off any dust or dirt in the vicinity of thegas control valve.B. GGauge IInstallation1. Locate the outlet pressure tap, see Fig. 14. Removethe pressure tap plug using a 3/16 in. allen key.2. Securely connect a pressure gauge at this pressuretap, and at the tee adapter at heater inlet. See Fig.14.3. Open the fuel supply valves to the heater, reconnectthe heater electrical supply, and start the heater.C. RReading PPressures1. With the heater operating, the pressure gaugesshould read the pressures specified on the dataplate.2. Do the readings at the inlet and outlet pressuregauges agree with that specified on the dataplate?If so, then no further checking or adjustment isrequired. Proceed to section D.3. If the inlet pressures do not agree with that specifiedon the dataplate, then the regulator controlling gaspressure to the heater requires adjustment.4. If the inlet pressure is correct but the burner manifoldpressure does not agree with that specified on thedataplate, then the HI and LO heat output feature ofthe gas control valve requires adjustment.5. Turn the thermostat down to its lowest setting.Remove the cap from the HI and LO heat adjustingscrews at the two stage pressure regulator on the gascontrol valve.6. Slowly turn up the thermostat until the valve opens infirst stage position and a pressure is read of nogreater than 1.3 in. W.C. (L.P.) or .8 in. W.C. (N.G.) atthe outlet pressure gauge. If less than 1.3 in. W.C.(L.P.) or .8 in. W.C. (N.G.) is read, the LO heat settingat the regulator on the gas control will requireadjusting. Turn clockwise to increase, orcounterclockwise to decrease.7. Turn the thermostat completely up. You should seethe valve open at second stage position and the gaspressure increase from 1.3 in. W.C. (L.P.) or .8 in. W.C.(N.G.) at first stage heat to 5.2 in. W.C. (L.P.) or 3.1 in.W.C. (N.G.) second stage heat. If less or greater than5.2 in. W.C. (L.P.) or 3.1 in. W.C. (N.G.), the HI heatsetting must be adjusted clockwise orcounterclockwise accordingly until proper pressure isachieved.D. CCompletion1. Once the proper inlet and burner manifold pressureshave been confirmed and/or properly set, close thefuel supply valve to the heater and allow the heater toburn off any gas remaining in the gas supply line.2. Disconnect the heater from its electrical supply.3. Remove the gauges, gas hose, and tee.4. Install pressure tap plug.5. Reconnect sediment trap and gas hoses.6. Open fuel supply valve. Start the heater and checkfor gas leaks.7. Set thermostat to desired temperature.Gas Pressure ChecksFIG. 14