Lennox HP29

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1 − Compressor Cover (Figure 9)A compressor cover COVERconstructed of vinyl-facedfiberglass is used on allHP29 units. The coverprovides an acoustic barrier.The cover slides over thecompressor and is heldsecure with snap buttons.Slits are provided forinstallation around thedischarge and suction lines.FIGURE 9SLIT FORSUCTIONLINESNAPBUTTONSCOMPRESSORSLIT FOR DISCHARGE LINE2 − Crankcase HeaterA crankcase heater is used on all HP29 units equipped witha reciprocating compressor. The well−mountedinsertion−type heater is self−regulating. See table 8 forcrankcase heater specifications.TABLE 8HP29 CRANKCASE HEATER RATINGSUnitRating (Watts)HP29−211/-261/-311/-41040 wattsHP29-460,-510and-65027 wattsHP29−018/−024/−03040 wattsHP29−04227 wattsC − Condenser Fan MotorAll units use single−phase PSC fan motors which require a runcapacitor. In all HP29 units, (except "G" and "J" voltage) theoutdoor fan is controlled by the CMCI defrost board.ELECTRICAL DATA tables in this manual showspecifications for outdoor fans used in HP29s.Access to the outdoor fan motor on all units is gained byremoving the seven screws securing the fan assembly.See figure 10. The outdoor fan motor is removed fromthe fan guard by removing the four nuts found on the toppanel. If condenser fan motor must be replaced, alignfan hub flush with motor shaft.Remove (7) screwsRemove (4) nutsCONDENSER FAN MOTORAND COMPRESSOR ACCESSFANALIGN FAN HUBFLUSH WITHMOTOR SHAFTFAN GUARDWIRING DRIPLOOPREMOVE (7) SCREWSSECURING FAN GUARD.REMOVE FAN GUARD/FAN ASSEMBLY.FIGURE 10D − Reversing Valve L1 and SolenoidA refrigerant reversing valve with electromechanicalsolenoid is used to reverse refrigerant flow during unitoperation. The reversing valve requires no maintenance.It is not repairable. If the reversing valve has failed, it mustbe replaced.If replacement is necessary, access reversing valve byremoving the outdoor fan motor. Refer to figure 10.III − REFRIGERANT SYSTEMRefer to figure 11 for refrigerant flow in the cooling modes.The reversing valve is energized during cooling demandand during defrost.A − Liquid and Vapor Line Service ValvesThe liquid and vapor line service valves (figures 12 and 13)and gauge ports are accessible from outside the unit.Each valve is equipped with a service port. The service portsare used for leak testing, evacuating, charging and checkingcharge. A schrader valve is factory installed. A service port capis supplied to protect the schrader valve from contaminationand serve as the primary leak seal.NOTE-Always keep valve stem caps clean.DEFROST THERMOSTATOUTDOOR UNITDISTRIBUTORHEATING MODEEXPANSION/CHECKVALVEBI-FLOWFILTER / DRIEROUTDOORCOILREVERSING VALVELOWPRESSUREHIGHPRESSUREINDOOR UNITMUFFLERTOHCFC22DRUMCOMPRESSORSUCTIONSERVICEPORTVAPORLINEVALVELIQUID LINESERVICE PORTTHERMOMETERWELLEXPANSION/CHECKVALVENOTE − ARROWS INDICATE DIRECTION OF REFRIGERANT FLOWFIGURE 11INDOORCOILPage 10
IMPORTANTService valves are closed to the heat pump unitand open to line set connections. Do not open untilrefrigerant lines have been leak tested andevacuated. All precautions should be exercised tokeep the system free from dirt, moisture and air.To Access Schrader Port:1 − Remove service port cap with an adjustable wrench.2 − Connect gauge to the service port.3 − When testing is completed, replace service port cap.Tighten finger tight, then an additional 1/6 turn.To Open Liquid or Vapor Line Service Valve:1 − Remove stem cap with an adjustable wrench.2 − Using service wrench and hex head extension (5/16 forvapor line and 3/16 for liquid line), back the stem outcounterclockwise until the valve stem just touches theretaining ring.3 − Replace stem cap tighten firmly. Tighten finger tight, thentighten an additional 1/6 turn.LIQUID LINE SERVICE VALVE (VALVE OPEN)INSERT HEXWRENCH HERESTEM CAPOUTLET (TOCOMPRESSOR)SERVICEPORTDANGERDo not attempt to backseat this valve. Attempts tobackseat this valve will cause snap ring to explodefrom valve body under pressure of refrigerant.Personal injury and unit damage will result.To Close Liquid or Vapor Line Service Valve:1 − Remove stem cap with an adjustable wrench.2 − Using service wrench and hex head extension (5/16 forvapor line and 3/16 for liquid line), turn stem clockwise toseat the valve. Tighten firmly.3 − Replace stem cap. Tighten finger tight, then tighten anadditional 1/6 turn.VAPOR LINE SERVICE VALVE (VALVE OPEN)INSERT HEXSTEM CAPWRENCH HEREINLET (TOINDOOR COIL)SCHRADERVALVESERVICE PORTCAPOUTLET (TOCOMPRESSOR)SERVICE PORTVAPOR LINE SERVICE VALVE (VALVE CLOSED)INLET (TORETAINING RINGSTEM CAPINDOOR COIL)SERVICEPORTCAPSCHRADERVALVESERVICEPORTSERVICEPORT CAPSCHRADER VALVE OPENTO LINE SET WHEN VALVE ISCLOSED (FRONT SEATED)FIGURE 12INLET (TOINDOOR COIL)LIQUID LINE SERVICE VALVE (VALVE CLOSED)RETAINING RING STEM CAPOUTLET (TOCOMPRESSOR)INSERT HEXWRENCH HEREINLET(TO INDOOR COIL)(VALVE FRONTSEATED)SERVICEPORTSERVICE PORTCAPSCHRADER VALVE OPENTO LINE SET WHEN VALVE ISCLOSED (FRONT SEATED)FIGURE 13INSERT HEXWRENCH HERE(VALVE FRONTSEATED)OUTLET (TOCOMPRESSOR)Vapor Line (Ball Type) Service Valve(5 Ton Only)A ball-type full service valve is used on HP29 5 ton units.These vapor line service valves function the same way,differences are in construction. Valves are not rebuildable.If a valve has failed it must be replaced. A ball valve isillustrated in figure 14.The ball valve is equipped with a service port. A schradervalve is factory installed. A service port cap is supplied toprotect the schrader valve from contamination and assure aleak free seal.Page 11
Page 1: Service LiteratureCorp. 9709−L5Re
Page 5 and 6: 3 − Potential Relay K31 (Start)Al
Page 7 and 8: 9 − Defrost SystemUnits built Apr
Page 9: B − Compressor (Reciprocating & S
Page 13 and 14: IV − CHARGINGUnit charge is based
Page 15 and 16: TABLE 13SUBCOOLING METHODAMBIENT TE
Page 17 and 18: REFRIGERANT LINE SETS:HOW TO INSTAL
Page 19 and 20: HP29 SINGLE-PHASE WITH RECIPROCATIN
Page 21 and 22: HP29 SINGLE−PHASE WITH SCROLL COM
Page 23 and 24: HP29 SINGLE−PHASE WITH SCROLLCOMP
Page 25 and 26: HP29 THREE−PHASE WITH RECIPROCATI
Page 27: HP29 THREE-PHASE OPERATING SEQUENCE

Lennox HP29

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