LGA/LCA/LHA - lennox

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FREEZESTATS (2) ONE FOR EACH STAGE OF COIL (LOCATED ON RETURN BEND) LIQUID LINE (2) VAPOR LINE (2) SUCTION LINE (OUTLET) LHA180/240 PLUMBING COMPONENTS early model shown with accumulator LIQUID LINE (2) VAPOR LINE (2) COMPRESSOR DETAIL LHA180/240 REFRIGERANT CIRCUITS LHA180/240 LOW PRESSURE SWITCH (S87) ACCUMULATOR early models only DEFROST PRESSURE SWITCH (S46) PRESSURE TAP REVERSING VALVE (L1) (S88) (S104) CIRCUIT 2 (S7) (STG 2) VAPOR LINE ACCUMULATOR LINE (INLET) CIRCUIT 1 (STG 1) HIGH PRESSURE SWITCH (S4) COMPRESSOR VAPOR LINE LOW AMBIENT SWITCH (S11) (S84) FIGURE 13 Page 42 STAGE 1 INDOOR COIL DRIER (2) STAGE 2 INDOOR COIL DEFROST TEMPERATURE SWITCHES (S9) (S6) STAGE 1 OUTDOOR COIL STAGE 2 OUTDOOR COIL
B−Cooling Components LGA/LCA/LHA units use independent cooling circuits consisting of separate compressors, condenser coils and evaporator coils. See figures 11, 12, and 13. Four draw−through type condenser fans are used in all units. All units are equipped with belt-drive blowers which draw air across the evaporator during unit operation. Cooling may be supplemented by a factory- or fieldinstalled economizer. The evaporators are slab type and are stacked. Each evaporator uses a thermostatic expansion valve as the primary expansion device. Each evaporator is also equipped with enhanced fins and rifled tubing. In all units each compressor is protected by a crankcase heater, high pressure switch and low pressure switch. Additional protection is provided by low ambient switches and freezestats (on each evaporator). 1−Compressors B1 and B2 (all units) B13 (all LGA/LCA/156H 180/210/240 units) B20 (all LGA/LCA 210/240/300S units) Early model LGA/LCA standard efficiency and early model LHA high efficiency units use reciprocating type compressors. All LGA and LCA high efficiency units , late model LGA/ LCA standard efficieny and late model LHA high efficiency units use scroll compressors. All LGA/LCA 13 ton (46 kW) units use three four ton (14.1 kW) compressors;15 ton (52.8 kW) units use three five-ton (10.6 kW) compressors; 17.5 ton (61.5 kW) units use four four-ton (14.1 kW) compressors; 20 ton (70.3 kW) units use four five-ton (17.6 kW) compressors and 25 ton (88 kW) units use four six ton (21 kW) compressors. All LHA 15 ton (52.8 kW) units use two 7.5-ton (26.4 kW) compressors and 20-ton (70.3 kW) units use two 10-ton (35.2 kW) compressors. All units are equipped with independent cooling circuits. Likewise, compressor capacity may vary from stage to stage. In all cases, the capacity of each compressor is added to reach the total capacity of the unit. WARNING Electrical shock hazard. Compressor must be grounded. Do not operate without protective cover over terminals. Disconnect power before removing protective cover. Discharge capacitors before servicing unit. Failure to follow these precautions could cause electrical shock resulting in injury or death. Each compressor is energized by a corresponding compressor contactor. NOTE−Refer to the wiring diagram section for specific unit operation. Page 43 2−Crankcase Heaters HR1 and HR2 (all units) HR5 (LGA/LCA 156H/180/210/240/300S) HR11 (LGA/LCA 210/240/300S) Early model LGA/LCA standard efficieny units use insertion type heaters. All other modes use belly-band type crankcase heaters. HR1 is installed around compressor B1, heater HR2 compressor B2, HR5 compressor B13, and HR11 compressor B20. Crankcase heater wattage varies by compressor size. IMPORTANT Pressure switch settings on R410A charged units are significantly higher than units charged with R22. 3−High Pressure Switches S4 and S7 (all units) S28 (LGA/LCA 156H/180/210/240/300S) S96 (LGA/LCA 210/240/300S) The high pressure switches is an auto-reset SPST N.C. switch which opens on a pressure rise. All LGA/LCA/LCC/LHA units are equipped with this switch. The switch is located in the compressor discharge line and is wired in series with the compressor contactor coil. S4 (first circuit), S7 (second circuit), S28 (third circuit), and S96 (fourth circuit) are wired in series with the respective compressor contactor coils. Units charged with R22 When discharge pressure rises to 450 + 10 psig (3103+ 69 kPa) (indicating a problem in the system) the switch opens and the compressor is de−energized (the economizer can continue to operate). When discharge pressure drops to 300 + 20 psig (2068 + 138 kPa) the pressure switch will close. Units charged with R410A Units charged with R410A refrigerant will have higher pressure switch settings. When discharge pressure rises to 640 + 10 psig (4413+ 69 kPa) (indicating a problem in the system) the switch opens and the compressor is de− energized (the economizer can continue to operate). When discharge pressure drops to 475 + 20 psig (3275 + 138 kPa) the pressure switch will close. Main control A55 has a three−strike counter before locking out. This means the control will allow three high pressure trips per one thermostat demand. The control can be reset by breaking and remaking the thermostat demand or manually resetting the control.
Page 1 and 2: Service Literature Corp. 9525−L6
Page 3 and 4: Cooling Ratings Refrigerant Charge
Page 5 and 6: SPECIFICATIONS − LCA/LGA 240H Gen
Page 7 and 8: SPECIFICATIONS − LHA 180/240 Unit
Page 9 and 10: OPTIONS / ACCESSORIES − LGA/LCA I
Page 11 and 12: OPTIONS / ACCESSORIES − LHA Item
Page 13 and 14: OPTIONS / ACCESSORIES − LHA Item
Page 15 and 16: OPTIONAL ELECTRIC HEAT ACCESSORIES
Page 17 and 18: ELECTRICAL DATA − LCA/LGA240/300
Page 19 and 20: ELECTRICAL DATA − LHA180 Scroll C
Page 21 and 22: BLOWER DATA LGA UNITS BLOWER TABLE
Page 23 and 24: BLOWER TABLE INCLUDES RESISTANCE FO
Page 25 and 26: BLOWER TABLE INCLUDES RESISTANCE FO
Page 27 and 28: BLOWER DATA LHA UNITS 15 and 20 TON
Page 29 and 30: CEILING DIFFUSER AIR RESISTANCE Uni
Page 31 and 32: LHA180 / 240 PARTS ARRANGEMENT ECON
Page 33 and 34: Page 33 COMPRESSORS 3 & 4 CONTROL M
Page 35 and 36: I−UNIT COMPONENTS LGA / LCA / LHA
Page 37 and 38: 18−Blower Motor Overload Relay S4
Page 39 and 40: A59 A61 IMC BOARD INPUTS AND OUTPUT
Page 41: FREEZESTATS (4) ONE FOR EACH STAGE
Page 45 and 46: 9−Defrost Components and Operatio
Page 47 and 48: COMBUSTION AIR INDUCER GAS VALVE HE
Page 49 and 50: The RAM control is illustrated in f
Page 51 and 52: 6−Flame Rollout Limits S47 and S6
Page 53 and 54: ELECTRIC HEAT DATA TABLE 4 LCA156
Page 55 and 56: TABLE 6 LCA210 − OPTIONAL ELECTRI
Page 57 and 58: TABLE 8 LCA240H (R−410A) REQUIRES
Page 59 and 60: E−Optional Electric Heat Componen
Page 61 and 62: TERMINAL STRIP (TB3) FUSE F3 F3 - 1
Page 63 and 64: TABLE 16 LGA/LCA240S NORMAL OPERATI
Page 65 and 66: B−Cooling Startup NOTE−The foll
Page 67 and 68: BURNER REMOVAL / SENSOR ORIENTATION
Page 69 and 70: TYPICAL FLASHING DETAIL UNIT BASE B
Page 71 and 72: drops below -20°F (28.9°C) the sw
Page 73 and 74: 1 L14 REHEAT VALVE 1 L14 REHEAT VAL
Page 75 and 76: Check−Out Test Humiditrol operati
Page 77 and 78: TABLE 30 REHEAT OPERATION Two−Sta
Page 79 and 80: Page 79 B7 diagram LGA, LCA210/240/
Page 81 and 82: Page 81 B15 diagram LHA180/240 Y, G
Page 83 and 84: 9 2 4 2 GAS HEAT FOR LGA156/300 11
Page 85 and 86: A7diagram EHA−15, 30, 45, 60, 90
Page 87 and 88: A6diagram EHA−15, 30, 45, 60, 90
Page 89: D1 diagram �L" SERIES ECONOMIZER

LGA/LCA/LHA - lennox

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