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Lennox 13ACX Installation And Service Procedure

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Service Literature
LOUVERED
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause personal injury, loss of life, or
damage to property.
Installation and service must be performed by a licensed
professional installer (or equivalent) or a service agency.
IMPORTANT
This unit must be matched with an indoor coil as
specified in Lennox
Product Specification bulletin.
previously charged with HCFC-22 must be flushed.
WARNING
Electric Shock Hazard. Can cause injury
or death. Unit must be grounded in
accordance with national and local
codes.
Line voltage is present at all components
when unit is not in operation on units with
single-pole contactors. Disconnect all
remote electric power supplies before
opening access panel. Unit may have
multiple power supplies.
INSTALLATION AND SERVICE
PROCEDURE
Corp. 0612-L2
Revised January 2015
NON-LOUVERED
Coils
Page 1

TABLE OF CONTENTS

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13ACX Air Conditioners, which will also be referred to in
this instruction as the outdoor unit, uses HFC-410A
refrigerant. This outdoor unit must be installed with a
matching indoor unit and line set as outlined in the Lennox
13ACX Product Specification bulletin.
This outdoor unit is designed for use in systems that use
one of the following refrigerant metering devices:
S
Thermal expansion valve (TXV)
S
Fixed orifice
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for noncompliance.
13ACX
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  Summary of Contents for Lennox 13ACX

  • Page 1: Table Of Contents

    ......13ACX Air Conditioners, which will also be referred to in This unit must be matched with an indoor coil as...
  • Page 2: Model Number Identification

    13ACX-024-230-01 4 lbs. 14 oz. 13ACX-024-230-02 4 lbs. 6 oz. 13ACX-024-230-03 5 lbs. 12 oz. 13ACX-024-230-10 through -13, -15, -17 4 lbs. 6 oz. 13ACX-024-230-18 3 lbs. 15 oz. 13ACX-024-230-19 4 lbs. 6 oz. Tested according to AHRI Standard 270-2008 test conditions.
  • Page 3 6 lbs. 3 oz. 13ACX-030-230-02 4 lbs. 4 oz. 13ACX-030-230-03 5 lbs. 13 oz. 13ACX-030-230-10 through -13, -15 4 lbs. 4 oz. 13ACX-030-230-17, -18, -19 5 lbs. 2 oz. Tested according to AHRI Standard 270-2008 test conditions. Refrigerant charge sufficient for 15 feet length of refrigerant lines.
  • Page 4: Electrical Data

    Rotor Rotor Rev. current Circuity Amps Motor HP Amps Amps Amps Protection Ampacity (FLA) (RLA) (LRA) (LRA) (amps) 1.0, 2.0 & 13ACX-018-230-01 12.3 48.0 1075 13ACX-018-230-02 12.0 48.0 1/10 1075 13ACX-018-230-03 13.0 48.0 1080 13ACX-018-230-10 12.0 48.0 1/10 1075 10.9 39.0...
  • Page 5 Nominal Rotor Rev. current Circuity Motor HP Amps Amps Amps Amps Protection Ampacity (FLA) (RLA) (LRA) (LRA) (amps) 1.0, 2.0 & 13ACX-030-230-01 18.7 14.1 73.0 1075 13ACX-030-230-02 18.7 14.1 73.0 1075 13ACX-030-230-03 19.3 14.1 73.0 1080 13ACX-030-230-10 18.7 14.1 73.0 1075 29.3...
  • Page 6 Nominal Rotor Rev. current Circuity Motor HP Amps Amps Amps Amps Protection Ampacity (FLA) (RLA) (LRA) (LRA) (amps) 1.0, 2.0 & 13ACX-042-230-01 24.1 17.9 112.0 1075 13ACX-042-230-03 25.2 17.9 112.0 1075 No Data 24.1 17.9 112.0 13ACX-042-230-10 25.3 18.8 112.0 28.1...
  • Page 7 Nominal Rotor Rev. current Circuity Motor HP Amps Amps Amps Amps Protection Ampacity (FLA) (RLA) (LRA) (LRA) (amps) 13ACX-060-230-01 1.0 & 2.0 34.5 26.2 134.0 13ACX-060-230-02 1.0 & 2.0 34.5 26.2 134.0 13ACX-060-230-05 35.6 26.2 134.0 1075 No Data 13ACX-060-230-10 34.5...
  • Page 8: Unit Dimensions

    LINE CONNECTION OPTIONAL UNIT STANDOFF KIT (4) (FIELD INSTALLED) SIDE VIEW SIDE VIEW Model Numbers 13ACX-018-230-01 24-1/4 (616) 29-1/4 (743) 13ACX-018-230-02 and later 24-1/4 (616) 25-1/4 (641) 13ACX-024-230-01 24-1/4 (616) 33-1/4 (845) 13ACX-024-230-02 and later 24-1/4 (616) 25-1/4 (641) 13ACX-030-230-XX (All)
  • Page 9: Typical Unit Parts Arrangement

    Gauge port seal cap 8 ft.- lb. 11 NM See the Lennox Service and Application Notes #C-08-1 USING MANIFOLD GAUGE SET for further details and information. When checking the system charge, only use a manifold gauge set that features low loss anti-blow back fittings.
  • Page 10: Service Valves

    500 psi. Gauge hoses must be rated for use at up to 800 removing refrigerant, flushing, leak testing, evacuating, psig of pressure with a 4000 psig burst rating. checking charge and charging. Each valve is equipped with a service port which has a factory-installed valve stem.
  • Page 11: Unit Placement

    For proper placement of unit in relation In order to avoid injury, take proper precaution when to a window see the provided illustration in figure 3, lifting heavy objects. Detail A. POSITIONING CONSIDERATIONS Consider the following when positioning the unit: Page 11 13ACX SERIES...
  • Page 12: Removing And Installing Louvers

    PLACING UNIT ON SLAB least the same height and width as outdoor unit. Mount barrier 24 inches (610 mm) from the sides of the unit in the When installing unit at grade level, the top of the slab direction of prevailing winds. should be high enough above grade so that water from higher ground will not collect around the unit.
  • Page 13: New Or Replacement Line Set

    Table 2. If the 13ACX is being used with either a new or existing indoor coil which is equipped with a liquid line which served IMPORTANT as a metering device (RFCI), the liquid line must be replaced prior to the installation of the 13ACX unit.
  • Page 14 Line Set Isolation — The following illustrations are examples of proper refrigerant line set isolation: REFRIGERANT LINE SET — INSTALLING REFRIGERANT LINE SET — TRANSITION VERTICAL RUNS (NEW CONSTRUCTION SHOWN) FROM VERTICAL TO HORIZONTAL NOTE — Insulate liquid line when it is routed through areas where the surrounding ambient temperature could become higher than the temperature of the liquid line or when pressure drop is equal to or greater ANCHORED HEAVY NYLON...
  • Page 15: Brazing Connections

    LIQUID LINE FILTER DRIER INSTALLATION WARNING The filter drier (one is shipped with each 13ACX unit) must be field installed in the liquid line between the outdoor unit's When using a high pressure gas such as liquid line service valve and the indoor coil's metering dry nitrogen to pressurize a refrigeration device (fixed orifice or TXV) as illustrated in figure 6.
  • Page 16 CAP AND CORE REMOVAL CUT AND DEBUR Cut ends of the refrigerant lines square (free from nicks or dents) Remove service cap and core from and debur the ends. The pipe must remain round. Do not crimp end both the suction / vapor and liquid line of the line.
  • Page 17 After all connections have been brazed, disconnect manifold gauge set from service ports. Apply additional water saturated cloths to both services valves to cool piping. Once piping is cool, remove all water saturated cloths. Refer to the unit installation instructions for the next step in preparing the unit. Figure 8. Brazing Procedures (continued) Page 17 13ACX SERIES...
  • Page 18: Flushing Line Set And Indoor Coil

    Flushing Line Set and Indoor Coil TYPICAL EXISTING FIXED ORIFICE TYPICAL EXISTING EXPANSION VALVE REMOVAL REMOVAL PROCEDURE (UNCASED PROCEDURE (UNCASED COIL SHOWN) COIL SHOWN) STUB END TWO PIECE PATCH PLATE LIQUID LINE CHECK DISTRIBUTOR TUBES (UNCASED COIL ONLY) ORIFICE EXPANSION LIQUID LINE ORIFICE HOUSING HOUSING VALVE...
  • Page 19: Installing Indoor Metering Device

    See the Lennox 13ACX Product Specification bulletin for of the expansion valve. Refer to below illustration for approved expansion valve kit match-ups. The expansion reference during installation of expansion valve unit.
  • Page 20: Leak Test Line Set And Indoor Coil

    Take care to empty all existing traps. Polyol ester (POE) oils are used in Lennox units charged with HFC-410A WARNING refrigerant. Residual mineral oil can act as an insulator, preventing proper heat transfer. It can also Refrigerant can be harmful if it is inhaled.
  • Page 21: Evacuating Line Set And Indoor Coil

    Reinstall service valve cores by removing manifold hose from service valve. Quickly install cores with core tool while maintaining a positive system pressure. Replace stem caps and secure finger tight, then tighten an additional one-sixth (1/6) of a turn as illustrated. Figure 12. Evacuating System Page 21 13ACX SERIES...
  • Page 22: Electrical Connections

    defined as any gas that will not condense under WARNING temperatures and pressures present during operation of an air conditioning system. Non-condensables and water Danger of Equipment Damage. Avoid deep vacuum suction combine with refrigerant to produce substances operation. Do not use compressors to evacuate a that corrode copper piping and compressor parts.
  • Page 23: System Operation

    AUTOMATIC HIGH PRESSURE SWITCH (S4) - USED ON MODELS 13ACX-XXX-230-10 AND LATER The 13ACX is equipped with an auto-reset high pressure switch (single-pole, single-throw) which is located on the liquid line. The switch shuts off the compressor when discharge pressure rises above the factory setting.
  • Page 24: Maintenance

    Indoor Unit Installation and service must be performed by a licensed 1. Clean or change filters. professional installer (or equivalent) or a service agency. 2. Lennox blower motors prelubricated Maintenance and service must be performed by a qualified permanently sealed.
  • Page 25: Start-Up And Performance Checklist

    Discharge Pressure Suction Pressure Refrigerant Charge Checked? Leak Checked? - Properly Insulated? - Refrigerant Lines: Outdoor Fan Checked? Fully Opened? - Caps Tight? Service Valves: Thermostat Calibrated? - Properly Set? - Level? - Voltage With Compressor Operating Page 25 13ACX SERIES...
  • Page 26: Sequence Of Operations

    5- Cooling demand is satisfied. Terminal Y1 is de‐energized . 6- Compressor contactor K1 is de‐energized. 7- K1‐1 opens and compressor (B1) and outdoor fan motor (B4) are de‐energized and stop immediately. Figure 14. Use for 13ACX-XXX-230-01 through -10 Page 26...
  • Page 27 Figure 15. Use for 13ACX-XXX-230-11 or later Page 27 13ACX SERIES...
  • Page 28: Servicing Unit Void Of Charge

    3. After evacuation is complete, open the liquid line and Servicing Units Void of Charge suction line service valves to release the refrigerant If the outdoor unit is void of refrigerant, clean the system charge (contained in outdoor unit) into the system. using the procedure described below.
  • Page 29 DT are within +3º. 10 – -5 Decrease the airflow 62º 4. Adjust the fan speed — See indoor unit instructions to increase/decrease fan speed. Figure 17. Checking Indoor Airflow over Evaporator Coil using Delta-T Chart Page 29 13ACX SERIES...
  • Page 30 START: Determine how refrigerant is metered WHEN TO CHARGE? Warm weather best Which Can charge in colder weather metering CHARGE METHOD? Determine by: device? Metering device type Outdoor ambient temperature REQUIREMENTS: Sufficient heat load in structure 65ºF 40ºF 39ºF 64ºF Indoor temperature between 70‐80ºF (18.3ºC) and (4.4ºC) and...
  • Page 31 11. Compare results with table below. See Table 4 on page 33 to determine which charging sticker to use. If value is LESS MORE or than shown, add LESS refrigerant. Figure 21. HFC-410A Subcooling TXV Charge Page 31 13ACX SERIES...
  • Page 32 1. Confirm proper airflow across coil using figure 17. START: Measure outdoor ambient temperature 39ºF 2. Compare unit pressures with normal operating (3.8ºC) and pressures provided on applicable charging sticker as reference in table 4. Below USE WEIGH‐IN METHOD 3. Use SUPERHEAT to correctly charge unit or to Weigh‐in or remove refrigerant ABOVE or verify the charge is correct.
  • Page 33 Unit Model Number 401238S 401288S 580052-01 580450-01 Reference charging stickers above are located at the end of this manual. 13ACX-018-230-XX -02. -10, -11, -12, -13, -14, -15 -17, -18 13ACX-024-230-XX -02. -10, -11, -12, -13, -15 -17, -18, -19, -20 13ACX-030-230-XX -02.
  • Page 34: Charging Information

    CHARGING INFORMATION FOR COMPLETE CHARGING DETAILS, REFER TO THE OUTDOOR UNIT INSTALLATION INSTRUCTIONS. AIRFLOW CHECK - Both airflow and refrigerant charge must be monitored Model for a proper system set‐up. It may be necessary to alternately check and Table 3. Normal Operating Pressures adjust the airflow and the refrigerant charge.
  • Page 35 CHARGING INFORMATION FOR COMPLETE CHARGING DETAILS, REFER TO THE OUTDOOR UNIT INSTALLATION INSTUCTION. AIRFLOW CHECK - Both airflow and refrigerant charge must be monitored Model for a proper system set‐up. It may be necessary to alternately check and Table 3. Normal Operating Pressures adjust the airflow and the refrigerant charge.
  • Page 36 CHARGING INFORMATION FOR COMPLETE CHARGING DETAILS, REFER TO THE OUTDOOR UNIT INSTALLATION INSTRUCTION. AIRFLOW CHECK - Both airflow and refrigerant charge must be monitored for a proper system set‐up. It may be necessary to alternately check and Size adjust the airflow and the refrigerant charge. Table 3.
  • Page 37 13ACX CHARGING INFORMATION AIRFLOW CHECK - Both airflow and refrigerant charge must be monitored for a proper Table 4. Normal Operating Pressures system set‐up. It may be necessary to alternately check and adjust the airflow and the Size refrigerant charge.
  • Page 38 INDEX Brazing Connections, Page 15 Charging Stickers, Page 33 Clearances, Page 11 Checklist, Page 25 Control Wiring, Page 23 Dimensions - Unit, Page 8 Disconnect Switch, Page 22 Electrica Data, Page 4 Transformer - 24VAC, Page 22 Wire Length Run, Page 23 Electrical, Page 22 Disconnect Switch, Page 22 Equalizer Line, Page 19...
  • Page 39 Maintenance Metering Device Installation, Page 19 Indoor Coil, Page 24 Equalizer Line, Page 19 Indoor Unit, Page 24 Sensing Blub, Page 19 Outdoor Coil, Page 24 Outdoor Unit, Page 24 Model Number, Page 2 Parts Arrangement, Page 9 Pressure Switch (S4) - Manual, Page 23 Manual Reset, Page 23 POE Oils, Page 13 Pressure Switch (S4) - Automatic, Page 23...