Lennox HP29

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Pressure Switch CircuitThe defrost control incorporates a pressure switch circuitthat allows the application of an optional high pressureswitch. See figure 7. During a demand cycle, the defrostcontrol will lock out the unit if the optional high pressureswitch opens. The diagnostic LEDs will display a pattern foran open high pressure switch. See table 5. The unit willremain locked out until the switch resets or is reset.Remove the factory-installed jumper before connecting theoptional high pressure switch to the control board.NOTE − If not using a pressure switch, the factory-installedjumper wire must be connected.Diagnostic LEDsThe defrost board uses two LEDs for diagnostics. The LEDsflash a specific sequence according to the condition.TABLE 5DEFROST CONTROL BOARD DIAGNOSTIC LEDMODE LED 1 LED 2Normal operation /power to boardSynchronizedFlash with LED 2Board failure or no power Off OffBoard failure On OnHigh pressure switch open Flash OnLow pressure switch open* On FlashPressure switch lockout* On OffAnti−short−cycle /5−minute delay**Optional units only.Optional UnitsAlternating Flashwith LED 2SynchronizedFlash with LED 1Alternating Flashwith LED 1Optional units include a defrost control which includes atimed−off delay and a second pressure switch circuit.Time−Delay RelayThe time delay is five minutes long. The delay featureprotects the compressor in cased of an interruption inpower to the unit. The time delay may be bypassed byplacing the temperature select jumper across the TESTpins for 0.5 seconds.Pressure Switch CircuitThe defrost control board used in optional units includes athree−strike lock−out feature and LO PS terminals toaccommodate the addition of a field−provided low pressureor loss of charge pressure switch. See figure 7.During a single demand cycle, the defrost control will lockout the unit after the third time that the circuit is interruptedby any pressure switch that is wired to the control board. Inaddition, the diagnostic LEDs will indicate a locked outpressure switch after the third occurrence of an openpressure switch. See table 5. The unit will remain lockedout until power is broken then remade to the control or untilthe jumper is applied to the TEST pins for 0.5 seconds.NOTE − The defrost control board ignores input from thelow pressure switch terminals during the TEST mode,during the defrost cycle, during a 90−second start−upperiod, and for the first 90 seconds each time the reversingvalve switches heat/cool modes. If the TEST pins arejumpered and the 5−minute delay is being bypassed,the LO PS terminal signal is not ignored during the90−second start−up period.Ambient Thermister & Service Light ConnectionOptional units include a defrost control board whichprovides terminal connections for an ambient thermistorand a service light. The thermistor compensates forchanges in ambient temperature which might causethermostat droop. The service light thermostat provides asignal which activates the room thermostat service lightduring periods of inefficient operation.Page 8
B − Compressor (Reciprocating & Scroll)DANGERMake sure all power is disconnected beforebeginning electrical service procedures.Some HP29 units utilize a conventional reciprocatingcompressor. Table 6 shows the specifications of reciprocatingcompressors used in HP29 series units.TABLE 6HP29 COMPRESSOR SPECIFICATIONSUnit MAN/MODEL Voltage Phase LRA RLA Oil fl.oz.HP29−211 COP/CR16K6−PFV 208/230 1 49 8.6 45HP29−211 TEC/AWD5516EXD 208/230 1 48.3 7.9 32HP29−261HP29−261COP/CR22K6−PFV 208/230TEC/AWD5522EXD 208/2301156609.810.064532HP29−311 COP/CR28K6−PFV 208/230 1 75 13.7 45HP29−411HP29−413COP/CR34K6−PFV 208/230COP/CR35K6−TF5 208/23013967516.210.34545HP29−413 COP/CR35K6−TFD 460 3 40 4.3 45HP29−461 TEC/AV554OF 208/230 1 92 17.5 54HP29−463 TEC/AV5540F 208/230 3 87 12.8 54HP29−463 TEC/AV5540F 460 3 44 6.4 54HP29−511 TEC/AV5545F 208/230 1 110 23.4 54HP29−513 TEC/AV5545F 208/230 3 91 14.0 54HP29−513 TEC/AV5545F 460 3 46 7.1 54HP29−513 TEC/AV5545F 575 3 37 5.8 54HP29−651 TEC/AV5558F 208/230 1 123 26.9 54HP29−653HP29−653TEC/AV5558FTEC/AV5558F208/230460331286417.39.05454HP29−653 TEC/AV5558F 575 3 51 7.1 54HP29−018 COP/CR16K6−PFV 208/230 1 49 7.9 45HP29−024 COP/CR22K6−PFV 208/230 1 60 10.1 45HP29−036 TEC/AVD5535EXT 208/230 3 75 10.3 54HP29−036 TEC/AVD5535EXG 460 3 37.5 5.6 54HP29−042 TEC/AV5540F 208/230 3 87 12.8 54HP29−042 TEC/AV5540F 460 3 44 6.4 54Some HP29 units utilize a scroll compressor. The scrollcompressor design is simple, efficient and requires fewmoving parts. A cutaway diagram of the scroll compressor isshown in figure 8. The scrolls are located in the top of thecompressor can and the motor is located just below. The oillevel is immediately below the motor.SCROLL COMPRESSORDISCHARGEThe scroll is a simple compression concept centered aroundthe unique spiral shape of the scroll and its inherent properties.Two identical scrolls are mated together forming concentricspiral shapes. One scroll remains stationary, while the other isallowed to "orbit." The orbiting scroll does not rotate or turn butmerely orbits the stationary scroll. Due to its efficiency, thescroll compressor is capable of drawing a much deepervacuum than reciprocating compressors. Deep vacuumoperation can cause internal fusite arcing resulting indamaged internal parts and will result in compressorfailure. Never use a scroll compressor for evacuating orfor deep vacuum operation (operating compressor at 0psig or lower) on the system. Table 7 shows thespecifications of scroll compressors used in the HP29series units.TABLE 7HP29 COMPRESSOR SPECIFICATIONSUnit MAN/MODEL Voltage Phase LRA RLA Oil fl.oz.HP29−030 COP/ZR30KC−PFV 208/230 1 84 14.7 42HP29−036HP29−042COP/ZR36KC−PFVCOP/ZR42KC−PFV208/230208/230111001271620.34242HP29−048 COP/ZR46K3−PFV 208/230 1 129 23.7 66HP29−048HP29−048HP29−048COP/ZR46K3−TF5COP/ZR46K3−TFDCOP/ZR46K3−TFE208/23046057533312049.54013.57.45.8727272HP29−060HP29−060COP/ZR61K3−PFVCOP/ZR61K3−TF5208/230208/23013169 28.8137 17.35672HP29−060 COP/ZR61K3−TFD 460 3 62 9 72HP29−060 COP/ZR61K3−TFE 575 3 50 7.1 72Three-Phase Compressor RotationThree-phase scroll compressors must be phasedsequentially to ensure correct compressor rotation andoperation. At compressor start-up, a rise in discharge anddrop in suction pressures indicates proper compressorphasing and operation. If discharge and suction pressuresdo not perform normally, follow the steps below to correctlyphase the unit.1 − Disconnect power to the unit.2 − Reverse any two field power leads to the unit.3 − Reapply power to the unit.Discharge and suction pressures should operate withintheir normal start-up ranges.NOTE − Compressor noise level may be significantly higherwhen phasing is incorrect and the unit will not providecooling when compressor is operating backwards.Continued backward operation will cause the compressorto cycle on internal protector.SUCTIONFIGURE 8Page 9
Page 1: Service LiteratureCorp. 9709−L5Re
Page 5 and 6: 3 − Potential Relay K31 (Start)Al
Page 7: 9 − Defrost SystemUnits built Apr
Page 11 and 12: IMPORTANTService valves are closed
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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