Lennox LIAC024-180P431 Installation Manual Download Page 1

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Split Air Conditioner

Thank you for selecting LENNOX air conditioners.Please read this

manual carefully before operation and keep it for further reference.

INSTALLATION MANUAL

LENNOX AIR CONDITIONERS

MODEL:

LIAC024-180P431
LIAC036-180P431
LIAC048-180P431
LIAC060-180P431

Summary of Contents for LIAC024-180P431

Page 1: ...r selecting LENNOX air conditioners Please read this manual carefully before operation and keep it for further reference INSTALLATION MANUAL LENNOX AIR CONDITIONERS MODEL LIAC024 180P431 LIAC036 180P4...

Page 2: ...indoor and outdoor systems All of the manufac turer s split systems are A H R I rated only with TXV indoor systems Some of the benefits of installing approved matched indoor and outdoor split systems...

Page 3: ...or injury or severe equipment damage System contains oil and refrigerant under high pressure Recover refrigerant to relieve pressure before opening system CONTAINS REFRIGERANT Failure to inspect or u...

Page 4: ...at is required for line lengths over 50 feet Use only the line diameters indicated in Table Such as the connecting tube is more than 60 feet does not use large Suction line than recommend 5 1 Section...

Page 5: ...ater from pouring directly on the unit Note It is recommended that these precautions be taken for units being installed in areas where snow accumulation and prolonged below freezing temperatures occur...

Page 6: ...ll sides The pad must be separate from any structure The pad must be level The pad should be high enough above grade to allow for drainage The pad location must comply with National State and Local co...

Page 7: ...izes Service Valve Connection Sizes Model Suction Line Liquid Line Suction Line Connection Liquid Line Connection 24 36 48 60 3 4 3 8 3 4 3 8 3 8 3 8 7 8 7 8 Table 5 1 5 3 Refrigerant Line Insulation...

Page 8: ...ed when refrigerant lines are run in stud spaces or enclosed ceilings Where the refrigerant lines run through a wall or sill they should be insulated and isolated Isolate the lines from all ductwork M...

Page 9: ...her appropriate method every 8 ft 8 Feet Maximum Isolation Through Wall DO NOT hang line sets from ductwork Sealant Insulation Suction Line Wall Ductwork Isolator Line Set Section 7 Refrigerant Line B...

Page 10: ...to the service valves Check liquid line filter drier s directional flow arrow to confirm correct direction of refrigeration flow away from outdoor unit and toward evaporator coil as il lustrated Braz...

Page 11: ...lves have cooled STEP 2 Check for leaks by using a soapy solution or bubbles at each brazed location Section 8 Refrigerant Line Leak Check 8 1 Check For Leaks STEP 1 Pressurize the refrigerant lines a...

Page 12: ...ce Valve must be opened first BEFORE opening the Liquid Service Valve STEP 1 Remove service valve cap STEP 2 Fully insert hex wrench into the stem and back out counterclockwise until valve stem just t...

Page 13: ...rom the outdoor unit to the indoor unit and to the thermostat Table 11 1 24 VOLTS WIRE SIZE MAX WIRE LENGTH 18 AWG 150 Ft 16 AWG 225 Ft 14 AWG 300 Ft 11 2 Low Voltage Hook up Diagrams Field provided b...

Page 14: ...equipment nameplate 2 Power wiring and grounding of equipment must comply with local codes 3 4 Low voltage wiring to be No 18 AWG minimum conductor The electric auxiliary heat connection INDOOR UNIT...

Page 15: ...Voltage Disconnect Switch 12 3 High Voltage Ground Ground the outdoor unit per national state and local code requirements Install a separate disconnect switch at the outdoor unit Field provided flexib...

Page 16: ...NCEL STEP 4 Wait ve 5 minutes before moving to Step 5 if no crankcase heater accessory is used Wait one 1 hour before starting the unit if compres sor crankcase heater accessory is used and the Outdoo...

Page 17: ...on step 2 Record the resulting value 4 This Is the amount of refrigerant to weigh in prior to opening the service valves New Installation weigh In Method woriksheeto 1 Line Length ft 2 value from Colu...

Page 18: ...ortant Whenever charge adjustment or expan sion valve adjustment if unit is running continuously the system must be operated for a minimum of five 5 minutes otherwise repeat step 3 Subcooling in cooli...

Page 19: ...ART FINAL SUPERHEAT SUCTION GAGE PRESSURE PSI SUCTION TEMP 6 7 8 9 10 11 12 13 55 173 176 179 182 185 188 191 195 60 188 191 195 198 201 204 208 211 65 204 208 211 215 218 221 225 229 70 221 225 229 2...

Page 20: ...nt when subcooling matches the charging chart Final Subcooling value 1 2 3 4 STEP 7 Stabilize the system Wait 5 minutes for the system condition to stabilize between adjustments 1 2 Remove gages 3 Rep...

Page 21: ...rget setting according to dehumidification and high capacity demands by manually adjusting the code 3 Sensor description A working T3 Sensor is required for Operating protection high temp low temp Out...

Page 22: ...unning time and outdoor ambient temperature by the running time and high pressure when hing pressure is lower than a certain value Enter defrosting The following 3 situations were determined to enter...

Page 23: ...l stop System will run again after 6 minutes Module temperature protection TF When TF 176 F the compressor and outdoor fan will stop When TF 145 F the compressor and outdoor fan will restart 5 Compres...

Page 24: ...inutes system lockup 2 times E7 protection in 180 minutes system lockup 2 times PC protection in 180 minutes system lockup High low voltage protection DC fan motor fault System lockup 2 times E6 prote...

Page 25: ...ck key shortly check key Display the next set of data when press the key once The display content is accordance with the sequence 2 There re 3 digits for LED The first digit is sequence only display u...

Page 26: ...nect a reactor betw een 2 and 3 15 Spot check button 4 Defrosting function dial codeSW5 16 Forced operation button 5 Pressure transducer port 17 Reserved 6 Air discharge temp sensor port 18 Nixie tube...

Page 27: ...26 For 48 60k model 33 36 34 35 23 24 25 26 32 27 15 21 18 19 16 14 20 22 17 13 12 10 11 8 9 1 2 3 4 5 6 7 30 31 29 28...

Page 28: ...ainboard No Throttle problem Replace TXV of indoor unit in cooling or Replace EXV of outdoor unit in heating Yes Troubleshooting Function description for the corresponding position For 48 60k model No...

Page 29: ...ator is damaged or badly fixed No Check whether there s dust or fallen leaves influencing radiating No Check whether the fan and blade can normally operate Yes Check whether the duct including radiato...

Page 30: ...pressure in 10min then the refrigerant system is fault No Replace the mainboard Yes H5 P2 Low pressure PT Protection in cooling Diagnosis Handling Yes Check whether indoor unit is normal valve is blo...

Page 31: ...ired according to wiring nameplate Yes Check whether there re other heat sources around T3 T4 No Check whether high pressure switch HPS is in fault CLOSE is normal whether the fan doesn t operate No P...

Page 32: ...just the TXV for full evaporation and superheat 3 To further adjust TXV swich to SW4 4 ON No Replace the mainboard No Troubleshoot outdoor fan replace the fan motor or fan blade No Replace outdoor EV...

Page 33: ...08 240 115 6 2 503 1 18 100 37 8 31 807 3 99 245 118 3 2 334 1 12 105 40 6 28 398 3 89 250 121 1 2 172 1 06 110 43 3 25 506 3 8 255 123 9 2 024 1 115 46 1 22 861 3 7 260 126 7 1 888 0 95 120 48 9 20...

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Page 35: ...82 15 1 15 136 3 32 42 5 2 47 27 0 99 12 0 43 82 1 84 15 5 1 17 137 3 36 43 2 5 28 1 01 11 5 0 44 83 1 86 16 1 19 138 3 39 43 5 2 53 29 1 02 11 0 45 84 1 88 16 5 1 21 139 3 43 44 2 56 30 1 03 10 5 0...

Page 36: ...16123000A12761 V1 0...

Page 37: ...100g A4...

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