Lennox ML14XC1 Series Installation And Service Procedure
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Lennox ML14XC1 Series Installation And Service Procedure

Units with all-aluminum coil
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Service Literature
ML14XC1 (HFC-410A) SERIES UNITS WITH ALL-ALUMINUM COIL
This literature is intended as a general guide and does not
supersede local codes in any way. Consult authorities who
have jurisdiction before installation.
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 Engineering Handbook. Coils
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.
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.
INSTALLATION AND SERVICE PROCEDURE
Corp. 1502-L7
September, 2018
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ML14XC1 Air Conditioners, which will 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
ML14XC1 Engineering Handbook.
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 : Special procedures are required for
cleaning the aluminum coil in this unit. See page 22 in this
manual for information.
ML14XC1
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Summary of Contents for Lennox ML14XC1 Series

  • Page 1: Table Of Contents

    This outdoor unit must be installed with a remote electric power supplies before opening access panel. Unit may have matching indoor unit and line set as outlined in the Lennox multiple power supplies. ML14XC1 Engineering Handbook. This outdoor unit is designed for use in systems that use...

  • Page 2: Model Number Identification

    Model Number Identification − − Product Tier ® ML = Merit Series Nominal SEER Minor Revision Number Refrigerant Ratings Revision Level X = R-410A Voltage Unit Type 230 = 208/230V-1phase-60hz C = Air Conditioner Nominal Cooling Capacity - Tons Cooling Stages 018 = 1.5 1 = Single Stage Compressor 024 = 2...

  • Page 3: Electrical Data

    37-1/4 (946) -036 28-1/4 (724) 37-1/4 (946) -041 28-1/4 (724) 37-1/4 (946) -042 28-1/4 (724) 33-1/4 (845) -047 32-1/4 (819) 33-1/4 (845) -048 28-1/4 (724) 37-1/4 (946) -059 32-1/4 (819) 37-1/4 (946) -060 32-1/4 (819) 33-1/4 (845) Page 3 ML14XC1 SERIES...

  • Page 4: Typical Unit Parts Arrangement

    Typical Unit Parts Arrangement CAPACITOR (C12) GROUND LUG CONTACTOR 1-POLE (K1-1) CONTROL BOX COMPRESSOR HARNESS COMPRESSOR HARNESS HIGH PRESSURE HIGH PRESSURE SWITCH (S4) SWITCH (S4) LIQUID LINE LIQUID LINE SERVICE VALVE SERVICE VALVE LIQUID LINE LIQUID LINE SUCTION LINE SERVICE VALVE SERVICE VALVE SUCTION LINE SERVICE VALVE...

  • Page 5: Component Specifications

    -030 .060 breaking off the wrench, or stripping the valve stem recess. -036 .071 -042 .081 See the Lennox Service and Application Notes #C-08-1 for further details and information. -048 .083 -060 .096 Table 3. Torque Requirements Parts Recommended Torque...
  • Page 6 SERVICE VALVES ANGLE AND BALL Operating Angle Type Service Valve: 1. Remove stem cap with an appropriately sized wrench. 2. Use a service wrench with a hex-head extension (3/16” for liquid line valve sizes and 5/16” for vapor line valve sizes) to back the stem out counterclockwise as far as it will go.

  • Page 7: Unit Placement

    Refer to figure 3 for mandatory to a window see the provided illustration in figure 4, installation clearance requirements. detail A. CAUTION In order to avoid injury, take proper precaution when lifting heavy objects. Page 7 ML14XC1 SERIES...

  • Page 8: 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 9: New Or Replacement Line Set

    LIQUID LINE FILTER DRIER INSTALLATION To obtain the correct information from Lennox, be sure to The filter drier (one is shipped with each ML14XC1 unit) communicate the following points: must be field installed in the liquid line between the outdoor Model (ML14XC1) and size of unit (e.g.
  • Page 10 LINE SET IMPORTANT — Refrigerant lines must not contact structure. INSTALLATION REFRIGERANT LINE SET — INSTALLING Line Set Isolation — The following illustrations are VERTICAL RUNS (NEW CONSTRUCTION SHOWN) examples of proper refrigerant line set isolation: NOTE — Insulate liquid line when it is routed through areas where the surrounding ambient temperature could become higher than the REFRIGERANT LINE SET —...

  • Page 11: Brazing Connections

    Polyol ester (POE) oils service valve and repeat procedure starting at are used in Lennox units charged with HFC-410A paragraph 4 for brazing the liquid line to service port refrigerant. Residual mineral oil can act as an valve.
  • Page 12 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 13 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 9. Brazing Procedures (continued) Page 13 ML14XC1 SERIES...

  • Page 14: 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 15: Installing Indoor Metering Device

    EITHER THE 4 OR 8 O'CLOCK POSITION. NEVER MOUNT ON MALE BRASS EQUALIZER BULB BULB BOTTOM OF LINE. LINE FITTING NOTE — NEVER MOUNT ON BOTTOM OF LINE. VAPOR LINE Figure 11. Installing Indoor Expansion Valve Page 15 ML14XC1 SERIES...

  • Page 16: 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 17: 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 13. Evacuating System Page 17 ML14XC1 SERIES...

  • Page 18: 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 19 HEAT Yellow to Y1 OUTDOOR UNIT Black to C (common) COOLING WIRE RUN LENGTH AWG# INSULATION TYPE LESS THAN 100' (30 METERS) TEMPERATURE RATING INDOOR BLOWER MORE THAN 100' (30 METERS) 16 35ºC MINIMUM. COMMON Page 19 ML14XC1 SERIES...
  • Page 20 HIGH PRESSURE SWITCH (S4) — LIQUID LINE CRANKCASE HEATER (HR1) CRANKCASE THERMOSTAT (S40) Figure 14. Typical Factory Wiring Diagram Page 20...
  • Page 21 Figure 15. Typical Factory Wiring Diagram (-059 Only - Future Production) Page 21 ML14XC1 SERIES...

  • Page 22: System Operation

    (less than 50psi). If the coil can­ location). not be cleaned using water alone, Lennox recom­ mends use of a coil cleaner with a pH in the range of When liquid line temperature drops below 50° F the 5 to 9.

  • Page 23: 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 23 ML14XC1 SERIES...

  • Page 24: Typical Field Wiring

    Typical Field Wiring Figure 16. Typical Field Wiring (All Models Except -059) Page 24...
  • Page 25 (if used) which energizes contactor K1 (provided S4 high pressure switch is closed). K1‐1 opens and compressor (B1) and outdoor fan 3- K1‐1 N.O. closes, energizing compressor (B1) and motor (B4) are de‐energized and stop immediately. Page 25 ML14XC1 SERIES...

  • Page 26: 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 27 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 19. Checking Indoor Airflow over Evaporator Coil using Delta-T Chart Page 27 ML14XC1 SERIES...
  • Page 28 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 29 See table 3 for to determine applicable charging information for specific model. If value is LESS MORE or than shown, add LESS refrigerant. Figure 23. HFC-410A Subcooling TXV Charge Page 29 ML14XC1 SERIES...
  • Page 30 Table 4. HFC-410A Temperature — Pressure (Psig) °F °C Psig °F °C Psig -40.0 11.6 15.6 -37.2 14.9 18.3 -34.4 18.5 21.1 -31.7 22.5 23.9 -28.9 26.9 26.7 -26.1 31.7 29.4 -23.3 36.8 32.2 -20.6 42.5 35.0 -17.8 48.6 37.8 -15.0 55.2 40.6...

This manual is also suitable for:

Hfc-410a seriesMl14xc1-018Ml14xc1s018Ml14xc1-024Ml14xc1s024Ml14xc1-030 ... Show all

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