Carrier Performance 48VR-A Installation Instructions Manual

Also see for Performance 15 48VR-A: Owner's information manual Owner's information manual

Contents

17REGULATOR COVER SCREWPLASTIC ADJUST SCREWLOW STAGEGAS PRESSUREREGULATOR ADJUSTMENTMANIFOLDPRESSURE TAPINLETPRESSURE TAPON/OFF SWITCHREGULATOR SPRINGHIGH STAGE GASPRESSURE REGULATORADJUSTMENT1/2˝ NPT OUTLET1/2˝ NPT INLETA04167Fig. 13 -- Two--Stage Gas Valve (208/230 VAC Models)If larger adjustments are required, change main burner orificesfollowing the recommendations of national and local codes.NOTE: All other appliances that use the same meter must beturned off when gas flow is measured at the meter.Proceed as follows:1. Turn off gas supply to unit.2. Remove pipe plug on manifold (See Fig. 11) and connectmanometer. Turn on gas supply to unit.3. Record number of seconds for gas meter test dial to makeone revolution.4. Divide number of seconds in Step 3 into 3600 (number ofseconds in one hr).5. Multiply result of Step 4 by the number of cubic feet (cu ft)shown for one revolution of test dial to obtain cubic feet (cuft) of gas flow per hour.6. Multiply result of Step 5 by Btu heating value of gas toobtain total measured input in Btuh. Compare this valuewith heating input shown in Table 5 (Consult the local gassupplier if the heating value of gas is not known).EXAMPLE: Assume that the size of test dial is 1 cu ft, onerevolution takes 32 sec and the heating value of the gas is 1050Btu/ft3. Proceed as follows:1. 32 sec to complete one revolution.2. 3600  32 = 112.5.3. 112.5 x 1 =112.5 ft3 of gas flow/hr.4. 112.5 x 1050 = 118,125 Btuh input.If the desired gas input is 115,000 Btuh, only a minor change in themanifold pressure is required.Observe manifold pressure(s) and proceed as follows to adjust gasinput(s):1. Remove regulator cover screw(s) over plastic adjustmentscrew(s) on gas valve (see Fig. 13).2. Turn the high stage plastic adjustment screw clockwise toincrease gas input and counterclockwise to decrease input(see Fig. 13). Manifold pressure must be between 3.2 and3.8 IN. W.C. for high stage.3. Replace high stage regulator cover screw on gas valve (seeFig. 13).4. Turn the low stage plastic adjustment screw clockwise to in-crease gas input and counterclockwise to decrease input (seeFig. 13). Low stage manifold pressure must be between 1.4and 2.0 IN. W.C.NOTE: Low stage manifold pressure must be adjusted after highstage manifold pressure is already adjusted.5. Replace low stage regulator cover screw(s) on gas valve(see Fig. 13).6. Turn off gas supply to unit. Remove manometer from pres-sure tap and replace pipe plug on manifold (see Fig. 11).Turn on gas and check for leaksFIRE AND UNIT DAMAGE HAZARDFailure to follow this warning could result in personalinjury or death and/or property damage.Unsafe operation of the unit may result if manifold pressureis outside this range.! WARNINGMeasure Manifold Pressure (Propane Units)Refer to propane kit installation instructions for properly checkinggas input.NOTE: For installations below 2,000 ft (610 m), refer to the unitrating plate for proper propane conversion kit. For installationsabove 2,000 ft (610 m), contact your distributor for proper propaneconversion kit.Check Burner FlameWith control access panel (see Fig. 20) removed, observe the unitheating operation. Watch the burner flames to see if they are lightblue and soft in appearance, and that the flames are approximatelythe same for each burner. Propane will have blue flame (See Fig.12). Refer to the Maintenance section for information on burnerremoval.48VR-- A