Lennox LIAC024-180P431 Installation Manual
  1. Manuals
  2. Brands
  3. Lennox Manuals
  4. Air Conditioner
  5. LIAC024-180P431
  6. Installation manual

Lennox LIAC024-180P431 Installation Manual

Hide thumbs

Advertisement

Table of Contents

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 A I R C O N D I T I O N E R S
MODEL:
LIAC024-180P431
LIAC036-180P431
LIAC048-180P431
LIAC060-180P431

Advertisement

Table of Contents
loading

Related Manuals for Lennox LIAC024-180P431

Summary of Contents for Lennox LIAC024-180P431

  • Page 1 Split Air Conditioner INSTALLATION MANUAL LENNOX A I R C O N D I T I O N E R S MODEL: LIAC024-180P431 LIAC036-180P431 LIAC048-180P431 LIAC060-180P431 Thank you for selecting LENNOX air conditioners.Please read this manual carefully before operation and keep it for further reference.

  • Page 2: Table Of Contents

    Table of Contents Section 1. Safety................2 Section 2. Unit Location Considerations........3 Section 3. Unit Preparation............5 Section 4. Setting the Unit............5 Section 5. Refrigerant Line Considerations........6 Section 6. Refrigerant Line Routing..........7 Section 7. Refrigerant Line Brazing..........8 Section 8. Refrigerant Line Leak Check........10 Section 9.

  • Page 3: Section 1. Safety

    Section 1. Safety CAUTION Important - This document contains a wiring diagram and service information. This is customer property and is CONTAINS REFRIGERANT! to remain with this unit. Please return to service informa- Failure to follow proper procedures can result in tion pack upon completion of work.

  • Page 4: Section 2. Unit Location Considerations

    Section 2. Unit Location Considerations 2.1 Unit Dimensions Unit Dimensions Models H x W x L(Inches) 24/36 24-15/16 x 29-1/8 x 29-1/8 48/60 33-3/16 x 29-1/8 x 29-1/8 The unit’s weight values is on the carton box. When mounting the outdoor unit on a roof, be sure the roof will support the unit’s weight.
  • Page 5 2.4 Location Restrictions Av oid Install Ensure the top discharge area is unrestricted for Near Bedroom s at least 60 inches above the unit. Clearance must be provided in front of the control box (access panels) and any other side Min.

  • Page 6: Section 3. Unit Preparation

    Section 3. Unit Preparation 3.1 Prepare The Unit For Installation STEP 1 - Check for damage and report promptly to the carrier any damage found to the unit. The charge port can be used to check to be sure the refrigerant charge has been retained during shipment.

  • Page 7: Section 5. Refrigerant Line Considerations

    Section 5. Refrigerant Line Considerations 5.1 Refrigerant Line and Service Valve Connection Sizes Table 5.1 Line Sizes Service Valve Connection Sizes Suction Liquid Suction Line Liquid Line Model Line Line Connection Connection 24/36 48/60 5.2 Required Refrigerant Line Length Determine required line length. 5.3 Refrigerant Line Insulation Important: The Suction Line must always be insulated.

  • Page 8: Section 6. Refrigerant Line Routing

    5.4 Reuse Existing Refrigerant Lines If using existing refrigerant lines make certain that all joints are brazed, not soldered. For retrofit applications, where the existing refrigerant lines will be used, the following precautions should be taken: Ensure that the refrigerant lines are the correct size.

  • Page 9: Section 7. Refrigerant Line Brazing

    8 Feet Maximum Wall Isolator Line Set 8 Feet Maximum Side View Secure Suction Line using isolators every 8 ft. Secure Liquid Line directly to Suction Line using tape, wire, or other appropriate method every 8 ft. Isolation In Wall Spaces Wall Sealant Ductwork...
  • Page 10 STEP 2 - Remove the pressure tap cap from both service valves. STEP 3 - Purge the refrigerant lines and indoor coil with dry nitrogen. This pipe must have a thimble STEP 4 Wrap a wet rag around the valve body to avoid heat damage and continue the dry nitrogen purge.

  • Page 11: Section 8. Refrigerant Line Leak Check

    STEP 5 - Replace the pressure tap caps after the service valves have cooled. Section 8. Refrigerant Line Leak Check 8.1 Check For Leaks STEP 1 Pressurize the refrigerant lines and evapo 150 PSI G rator coil to 150 PSIG using dry nitrogen. STEP 2 Check for leaks by using a soapy solution or bubbles at each brazed location.

  • Page 12: Section 9. Evacuation

    REQUIRED PARTS LIST Section 9. Evacuation 9.1 Evacuate the Refrigerant Lines and Indoor Coil Important: Do not open the service valves until the refrigerant lines and indoor coil leak check and evacuation are complete. 0350 Micr ons STEP 1 Evacuate until the micron gauge reads no higher than 350 microns, then close the valve to the vacuum pump.

  • Page 13: Section 11. Electrical - Low Voltage

    Section 11. Electrical - Low Voltage 11.1 Low Voltage Maximum Wire Length Table 11.1 defines the maximum total length of low Table 11.1 voltage wiring from the outdoor unit, to the indoor 24 VOLTS unit, and to the thermostat. WIRE SIZE MAX.
  • Page 14 OUTDOOR UNIT INDOOR UNIT Control Wiring for H/P Systems. Notes: Be sure power supply agrees with equipment nameplate. Power wiring and grounding of equipment must comply with local codes. Low voltage wiring to be No. 18 AWG minimum conductor. “-----”The electric auxiliary heat connection.

  • Page 15: Section 12. Electrical - High Voltage

    Section 12. Electrical - High Voltage 12.1 High Voltage Power Supply LIVE ELECTRICAL COMPONENTS! During installation, testing, servicing, and trouble shooting of this product, it may be necessary to work with live electrical components. Failure to fol low all electrical safety precautions when exposed to live electrical components could result in death or serious injury.

  • Page 16: Section 13. Start Up

    Section 13. Start Up 13.1 System Start Up STEP 1 - Ensure Sections 7, 8, 9, 10, 11, 12, and 13 have been completed. STEP 2 - Set System Thermostat to OFF. D O N E CANCEL STEP 3 - Turn on disconnect to apply power to the indoor and outdoor units.

  • Page 17: Section 14. System Charge Adjustment

    Section 14. System Charge Adjustment 14.1 charging: weigh-In Method weigh-In Method can be used for the Initial installation, or anytime a system charge is being replaced. weigh-In Method can also be used when power is not available to the equipment site or operating conditions (indoor/Outdoor tempera- tures) are not In range to verify with the subcooling charging method.
  • Page 18 14.2 Subcooling charging and refrigerant adjustment in cooling (above 55 F outdoor temp.) STEP 1 - Check the outdoor ambient temperatures. 120 ºF Outdoor Subcooling (in cooling mode) is the only recommended Temperature method of charging above 55ºF outdoor ambient Above 55ºF temperatures.
  • Page 19 STEP 4 - Calculate superheat value on suction valves(According to form ) R-410A REFRIGERAN CHART Measured Suction Line Temp. = ________ºF SUCTION FINAL SUPERHEAT(℉) Measured Suction Line Pressure = _______ PSIG TEMP (℉) SUCTION GAGE PRESSURE (PSI) Calculate superheat value = ________ºF Note:Make sure the superheat value of suction valve 105 101 110 105 101...
  • Page 20 STEP 6 - Adjust refrigerant level to attain proper gage pressure. Add refrigerant if the design subcooling is lower than the chart value. Connect gages to refrigerant bottle and unit as illustrated. Purge all hoses. Open bottle. Stop adding refrigerant when subcooling. matches the charging chart Final Subcooling value.

  • Page 21: Section 15 System Operation And Troubleshooting

    Section 15 System operation and Troubleshooting 1. Control logic description ● The variable speed system adopts the same control communication command as that of common heat pump and air condition unit , it is the 24V control command . ● The speed of compressor is controlled by outdoor unit itself according to the pressure transducer. Usually , to ensure stable and adequate capacity, the speed will change according to the evaporating pressure in cooling and according to the condensing pressure in heating , another, the pressure target may adjust automatically based on the compressor operating so that the capacity can better meet the needs.
  • Page 22 4、Defrost description (Heat Pump only) ● The demand defrost control measures the coil temperature with a sensor locatde on the heat pump coil.A second sensor located outside the outdoor coil is used to measure outdoor ambient temperature. The demand of defrost is computed by the coil temperature and outdoor ambient temperature ,also , by the running time and outdoor ambient temperature, by the running time and high pressure when hing pressure is lower than a certain value.
  • Page 23 5. Compressor Crankcase heater description Refrigerant migration during the off cycle can result in a noisy start up. Add a crankcase heater to minimize refrig- eration migration, and to help eliminate any start up noise or bearing “wash out”. All heaters must be located on the lower half of the compressor shell. Its purpose is to drive refrigerant from the compressor shell during long off cycles, thus preventing damage to the compressor during start-up.
  • Page 24 8. Fault code table CODE FAULT DESCRIPTION Temperature sensor fault(T3 /T4/T5/TF) High/low voltage protection DC fan motor fault System lockup, 2 times(E6),protection in 10 minutes Compressor discharge sensor(T5) is seated fault EEPROM fault Communication fault in main contrrol chip 3 times (P3) protection in 120 minutes,system lockup 3 times (P6) protection in 60 minutes,system lockup 5 times (P2) protection in 100 minutes,system lockup 3 times (P4) protection in 100 minutes,system lockup...
  • Page 25 9. Parameter point check table 1、Shift to display content of data code pipe when pressing point check 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 units digit, recycling display), the second and third digits are values.
  • Page 26 For 24/36k model Function description for the corresponding position Content Content Compressor iring terminal Temp. controller connecting port Reactor w iring terminal(connect a reactor betw een 2 and 3 ) Function dial code SW4 Reactor w iring terminal(connect a reactor betw een 2 and 3 ) Spot check button Defrosting function dial codeSW5 Forced operation button...
  • Page 27 For 48/60k model 24 25 26...
  • Page 28 Function description for the corresponding position (For 48/60k model) N o . C on t ent N o . C on t ent E X V d r i v ing po rt (HP onl y) 19 P oin t c he ck bu tt on H igh p r e ss u r e s w i t c h po rt 20 T e m p .
  • Page 29 P8 (Hurricane protection of the DC fan motor(for 48、60)) Eb/E6 (DC fan motor fault) Diagnosis Handling Diagnosis Handling Reseat the wiring Reseat the sensor Check whether motor wiring is Check whether motor wiring is according to wiring reliably connected according to reliably connected according to according to wiring nameplate...
  • Page 30 C5/E7 (Compressor discharge sensor(T5) is seated fault) H3/P3 (Compressor over current protection) Diagnosis Handling Diagnosis Handling Fix discharge temp. Check whether the sensor is Check whether the service sensor to the compressor Open the service valve not seated on the discharge discharge pipe, re-power valves are open on to start the unit...
  • Page 31 H8 (Pressure transducer(PT) fault) F1 (High pressure switch(HPS) fault) Diagnosis Handling Diagnosis Handling Wiring according to the Check whether pressure Check whether the service Open the service valve nameplate correctly and transducer(PT) wiring is normal valves are open power on to restart Check whether the voltage Whether high pressure switch between gauging pressure...
  • Page 32 H6/P4 (High compressor discharge temperature(T5) protection) HH/PH (low discharge superheat protection) Diagnosis Handling Diagnosis Handling Check whether T3，T5 are Check whether the service Open the service valve Replace sensors abnormal (refer to sensor fault valves are open testing) Check whether indoor unit is Check whether discharge temp.
  • Page 33 TABLE A TEMP F TEMP C RESISTANCE kΩ VOLTS DC TEMP F TEMP C RESISTANCE kΩ VOLTS DC -20.6 107.732 4.65 32.2 7.225 2.36 -17.8 93.535 6.401 2.21 79.521 4.54 37.8 5.683 2.07 -12.2 67.795 4.47 40.6 5.057 1.93 -9.4 57.948 4.39 43.3...
  • Page 34 TABLE C1 (For AC model) NSK-BD020I V=2*MPa+0.5 ℃ 1.04 0.27 1.07 0.28 2.02 2.05 1.11 -19.5 0.31 2.08 1.13 0.31 2.11 1.14 -18.5 0.32 2.14 1.16 0.33 2.16 1.17 -17.5 0.34 2.19 1.19 0.35 2.22 1.21 -16.5 0.35 2.25 1.22 0.36 2.28 1.24...
  • Page 35 TABLE C2 (For HP model) NSK-BD035I V=(8/7)*MPa+0.5 Te/Tc Pe/Pc Te/Tc Pe/Pc Te/Tc Pe/Pc ℃ ℃ ℃ 0.69 0.17 1.37 0.76 2.54 1.78 0.18 1.39 0.78 2.56 30.5 1.81 0.72 0.19 0.79 2.59 1.83 0.73 1.42 2.62 31.5 1.86 0.75 0.22 1.43 0.82 2.65...
  • Page 36 16123000A12761 V1.0...
  • Page 37 此页不做菲林 仅作为电子文档说明 双胶纸100g 大A4规格 印刷颜色为黑白...

This manual is also suitable for:

Liac048-180p431Liac036-180p431Liac060-180p431

Table of Contents