Carrier 50PG20-28 Controls, Start-up, Operation, Service And Troubleshooting Instructions

Also see for 48PG20---28: User's information manual User's information manual Installation and service instructions

Carrier 50PG20-28 Controls, Start-up, Operation, Service And Troubleshooting Instructions Manual pdf 86 page image

NOTE:DoNOTUSEwaterin excessof 130F,astheenzy-maticactivitywillbedestroyed.5. ThoroughlyapplyTotalineenviropanentaltyscumcoilcleanersolutiontoallcoilsurfacesincludingfinnedarea,tubesheetsandcoilheaders.6. Holdgardensprayernozzleclosetofinnedareasandap-plycleanerwithavertical,up-and-downmotion.Avoidsprayingin horizontalpatterntominimizepotentialforfindamage.7. Ensurecleanerthoroughlypenetratesdeepintofinnedareas.8. Interiorandexteriorfinnedareasmustbethoroughlycleaned.9. Finnedsurfacesshouldremainwetwithcleaningsolutionfor10minutes.10. Ensuresurfacesaxenotallowedtodrybeforerinsing.Re-applyingcleanerasneededto ensure10-minutesatura-tionisachieved.11.Thoroughlyrinseallsurfaceswithlowvelocitycleanwa-terusingdownwardrinsingmotionofwaterspraynozzle.Protectfinsfiomdamagefiomthespraynozzle.CONDENSATEDRAIN Checkandcleaneachyearatthestartofthecoolingseason.Anaccesspanelislocatedabovethecondensateconnectiontoalloweasycleanoutoftheconden-satepan.Thefirsttimethepanelisremoved,theinsulationbe-hindtheaccesspanelwill needtobecutaway.Carefullycuttheinsulationwithaknifeorbladeonthreesidessotheinsula-tioncanbefoldedoutofthewayduringcleaning.Becarefulnottodamagecomponentsbehindtheinsulationwhilecutting.Oncecleaningiscompleted,foldtheinsulationbackintoplaceandsecuretheaccesspanelintheoriginalposition.FILTERS Cleanorreplaceatstartofeachheatingandcool-ingseason,ormoreoftenif operatingconditionsrequire.Refertounitinstallationinstructionsfortypeandsize.OUTDOOR-AIRINLETSCREENSCleanscreenswithsteamorhotwaterandamilddeteNent.Donotusethrowawayfiltersinplaceofscreens.Seeunitinstallationinstructionsforquantityandsize.MAINBURNER(48PGOnly) At thebeginningof eachheatingseason,inspectfordeteriorationorblockageduetocor-rosionorothercauses.Observethemainburnertlmnes.RefertoMainBurnerssectiononpage91.FLUEGASPASSAGEWAYS(48PGOnly) Thetlue col-lectorboxandheatexchangercellsmaybeinspectedbyremovingheatsectionaccesspanel(Fig.5),tlueboxcover,andmainburnerassembly(Fig.36).RefertoMainBurnerssectiononpage91forburnerremovalsequence.If cleaningis re-qnired,cleantubeswithawirebrush.Usecautionwithcermnicheatexchangerbaffles.Whenin-stallingretainingclip,besurethecenterlegoftheclipextendsinwardtowardbaffle.SeeFig.37.COMBUSTION-AIRBLOWER(48PGOnly) Cleanpe-riodicallytoassureproperairflowandheatingeffidenc3_In-spectblowerwheeleverytallandperiodicallyduringheatingseason.Forthefirstheatingseason,inspectblowerwheelbi-monthlytodeterminepropercleaningfiequency.To inspect blower wheel, remove heat section panel. Usingan inspection mirror and llashlight, look into the tlue exhaustduct to inspect the wheel. If cleaning is required, relnove motorand wheel assembly by removing the screws holding the fluebox cover to the tlue box. See Fig. 36. Rmnove the screws hold-ing the inducer housing to the inlet plate. The wheel can then berelnoved from the motor shaft and cleaned with a detergent orsolvent. Replace the wheel onto the motor shaft in the correctposition and reassmnble the tlue cover onto the tlue box.HEATEXCHANGERSECTIONIGC BOARD(HIDDEN)COMBUSTIONFAN HOUSINGINDUCEDDRAFTMOTORMAI N GASVALVEMAIN BURNERSECTION160 -- Integrated Gas ControllerFig. 36 -- Typical Gas Heating SectionCERAMICBAFFLECLIPNOTE: One baffle and clip will be in each upper tube of the heatexchanger.Fig. 37 -- Removing Heat Exchanger CeramicBaffles and ClipsLubricationCOMPRESSORS Each compressor is charged with thecorrect amount ofoit at the thctory.The compressor is in a Puron,¢9reliigerant system and usesa polyolester (POE) oil. This oil is extremely hygroscopic,meaning it absorbs water readily. POE oils can absorb15 times as much water as other oils desiNled for HCFCand CFC refrigerants. Avoid exposure of the oil to theatmosphere. Damage to components could result.Polyolester (POE) compressor lubricants are known tocause long term damage to some synthetic roofing materials.Exposure, even if ilrnnediately cleaned up, may cause roofingmaterials to become brittle (leading to cracking) within ayear. When pertbnning any service which may risk exposure ofcompressor oil to the root; take appropriate precautions toprotect roofing. Procedures which risk oil leakage include com-pressor replacement, repairing refrigerant leaks, and replacingrefrigerant components. To prepare rooftop:1. Cover extended roof work area with an impermeableplastic dropctoth or tarp. Make sure a 10 x 10 area aroundthe work area is covered.86