Lennox ML13KC1 Installation Instructions Manual
Lennox ML13KC1 Installation Instructions Manual

Lennox ML13KC1 Installation Instructions Manual

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Service Literature
ML13KC1 (R-454B) SERIES UNITS WITH ALL-ALUMINUM COIL
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional HVAC installer or
equivalent, service agency, or the gas supplier.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
WARNING
Electric Shock Hazard. Can cause injury or
death. Unit must be properly 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.
WARNING
To prevent serious injury or death:
1. Lock-out/tag-out before performing maintenance.
2. If system power is required (e.g., smoke detector
maintenance), disable power to blower, remove fan
belt where applicable, and ensure all controllers
and thermostats are set to the "OFF" position before
performing maintenance.
3. Always keep hands, hair, clothing, jewelry, tools, etc.
away from moving parts.
UNIT INFORMATION
Corp. 100118
October 22, 2024

Table of Contents

Model Number Identification ...........................................4
Typical Serial Number Identification ...............................4
Unit Dimensions - Inches (mm) ....................................8
Typical Unit Parts Arrangement .....................................9
Component Specifications ...........................................10
Installation ....................................................................12
Unit Placement ............................................................12
New or Replacement Line Set ......................................14
Brazing Connections ...................................................17
Flushing Line Set and Indoor Coil ................................20
Installing Indoor Metering Device .................................21
Leak Testing the System .............................................22
Evacuating Line Set and Indoor Coil ...........................23
System Operation .........................................................28
Maintenance ...............................................................28
Typical Field Wiring ......................................................30
Unit Start-Up ...............................................................32
System Refrigerant .....................................................32
Charging ......................................................................33
Start Up Test Procedure ...............................................33
This unit must be matched with an indoor coil as specified
with AHRI. For AHRI Certified system match-ups and
expanded ratings, visit www.LennoxPros.com. Coils
previously charged with HCFC-22 must be flushed.
General Information
This ML13KC1 outdoor air conditioner with all-aluminum
coil is designed for use with R-454B refrigerant only. This
unit must be installed with an approved indoor air handler
or coil. For AHRI Certified system match-ups and expand-
ed ratings, visit www.LennoxPros.com. These instructions
are intended as a general guide and do not supersede
local codes in any way. Consult authorities having jurisdic-
tion before installation.
This outdoor unit is designed for use in systems that use
the following refrigerant metering device:
• Thermal expansion valve (TXV)
IMPORTANT: Special procedures are required for clean-
ing the aluminum coil in this unit. See page 28 in this man-
ual for information.
Page 1
ML13KC1

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Summary of Contents for Lennox ML13KC1

  • Page 1: Table Of Contents

    UNIT INFORMATION ML13KC1 Corp. 100118 October 22, 2024 Service Literature ML13KC1 (R-454B) SERIES UNITS WITH ALL-ALUMINUM COIL Table of Contents Model Number Identification ...........4 Typical Serial Number Identification .......4 Unit Dimensions – Inches (mm) ........8 Typical Unit Parts Arrangement ........9 Component Specifications ...........10...
  • Page 2 WARNING CAUTION • The appliance shall be stored in a room without con- Under no circumstances shall potential sources of tinuously operating ignition sources (for example: ignition be used in the searching for or detection of open flames, an operating gas appliance, or an oper- refrigerant leaks.
  • Page 3: Refrigerating System

    IMPORTANT IMPORTANT When breaking into the refrigerant circuit to make When removing refrigerant from a system, either for repairs – or for any other purpose – conventional servicing or decommissioning, it is recommended good procedures shall be used. However, for flammable practice that all refrigerants are removed safely.
  • Page 4: Model Number Identification

    Model Number Identification ML 13 K C 1 - 036 - 230 A 01 Product Tier Revision Level ML = Merit ® Series Nominal SEER2 Ratings Revision Level Voltage Refrigerant Type 230 = 208/230V-1 phase-60Hz K = R-454B Nominal Cooling Capacity Unit Type 018 = 1.5 tons C = Air Conditioner (Condenser)
  • Page 5 NOTE – R-454b is a A2L refrigerant. The system installation must meet the following parameters based upon total refrigerant charge (line set included). TAmin (Total minimum conditioned area)is the minimum allowable conditioned area based upon the total system charge at sea level. Values must be multiplied by altitude adjustment factor at installed altitude. Qmin table refers to minimum airflow requirements during refrigerant leak mitigation by the refrigerant detection system, based upon total system charge.
  • Page 6: Specifications

    SPE CI FI CATION S NORT H REGION Size Nominal Tonnage Sound Rating Number Connections Liquid line (OD) - in. (Sweat) Suction line (OD) - in. Compressor Type 1-Stage Scroll 1-Stage Scroll 1-Stage Scroll 1-Stage Scroll Refrigerant R-454B charge furnished 4 lbs.
  • Page 7 S P EC I F I CAT I ONS NORT H REGION Size Nominal Tonnage Sound Rating Number Connections Liquid line (OD) - in. (Sweat) Suction line (OD) - in. 1-1/8 Compressor Type 1-Stage Scroll 1-Stage Scroll 1-Stage Scroll Refrigerant R-454B charge furnished 6 lbs.
  • Page 8: Unit Dimensions - Inches (Mm)

    Unit Dimensions – Inches (mm) 4-3/8 4-3/8 (111) (111) INLET 4-3/8 4-3/8 (111 111) OPTIONAL UNIT INLET INLET STAND-OFF KIT (4) COMPRESSOR (Field Installed) COIL DRAIN OUTLETS (Around perimeter of base) 6-3/8 SUCTION LINE 4-3/8 (162) CONNECTION (111) LIQUID LINE INLET 6-3/8 4-3/8...
  • Page 9: 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 10: Component Specifications

    Using an Allen wrench rated at less than 50Rc risks rounding or breaking off the wrench, or stripping the valve stem recess. See the Lennox Service and Application Notes #C-08-1 for further details and information. Page 10...
  • Page 11: Service Valves

    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 12: Installation

    Installation The slab should have a slope tolerance as described in Unit Placement figure 4, detail B. See Unit Dimensions on page 8 for sizing mounting slab, NOTE – If necessary for stability, anchor unit to slab as platforms or supports. described in figure 4, detail B.
  • Page 13 DETAIL B DETAIL A Install unit level or, if on a slope, maintain slope tolerance of 2 degrees INSTALL UNIT AWAY (or 2 inches per 5 feet [50 mm per 1.5 m]) away from building structure. FROM WINDOWS DISCHARGE AIR BUILDING STRUCTURE MOUNTING...
  • Page 14: Removing And Installing Louvered Panels

    (braze connections) to the indoor L15-41 3/8 in. 3/4 in. 3/8 in. 3/4 in. unit coil (flare or braze connections). Use Lennox L15 15 ft. - 50 ft. -024 (10 mm) (19 mm) (10 mm) (19 mm) (4.6 m - 15 m)
  • Page 15 NOTE - When installing refrigerant lines longer than 50 If the ML13KC1 is being used with either a new or exist- feet, refer to the Refrigerant Piping Design and Fabrica- ing indoor coil which is equipped with a liquid line which tion Guidelines manual available on LennoxPros.com...
  • Page 16 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 17: Brazing Connections

    Take care to empty all existing traps. Polyol ester (POE) oils are used in Brazing alloys and flux contain materials which are Lennox units charged with R-454B refrigerant. Residual hazardous to your health. mineral oil can act as an insulator, preventing proper Avoid breathing vapors or fumes from brazing operations.
  • Page 18: Cap And Core Removal

    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 19: Braze Line Set

    WRAP SERVICE VALVES To help protect service valve seals during brazing, wrap water-saturated cloths around service valve bodies and copper tube stubs. Use additional water-saturated cloths underneath the valve body to protect the base paint. FLOW NITROGEN Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and out of the suction / vapor valve stem port.
  • Page 20: Flushing Line Set And Indoor Coil

    Flushing Line Set and Indoor Coil TYPICAL EXISTING EXPANSION VALVE REMOVAL CONNECT GAUGES AND EQUIPMENT FOR PROCEDURE (UNCASED COIL SHOWN) FLUSHING PROCEDURE STUB END INVERTED CYLINDER GAUGE TWO PIECE PATCH PLATE LIQUID LINE CHECK CONTAINS CLEAN MANIFOLD (UNCASED COIL ONLY) ORIFICE EXPANSION HCFC22* TO BE USED...
  • Page 21: Installing Indoor Metering Device

    (purchased separate- cabinet or external to the indoor coil. In applications where ly) at the indoor coil. See the ML13KC1 Product Specifi- an uncased coil is being installed in a field-provided ple- cations bulletin (EHB) for approved expansion valve kit num, install the expansion valve in a manner that will pro- match ups.
  • Page 22: Leak Testing The System

    IMPORTANT Leak Testing the System The Environmental Protection Agency (EPA) prohibits IMPORTANT the intentional venting of HFC refrigerants during maintenance, service, repair and disposal of appliance. Leak detector must be capable of sensing HFC refrigerant. Approved methods of recovery, recycling or reclaiming must be followed.
  • Page 23: Evacuating Line Set And Indoor Coil

    Evacuating Line Set and Indoor Coil EVACUATION HIGH CONNECT GAUGE SET NOTE - Remove cores from service valves (if not already done). A - Connect low side of manifold gauge set with 1/4 SAE in-line tee to vapor line service valve B - Connect high side of manifold gauge set to OUTDOOR MANIFOLD...
  • Page 24: Electrical - Circuit Sizing And Wire Routing

    Use copper wire only with this product. corrode copper piping and compressor parts. WARNING Unit must be installed with Lennox approved refrigerant detection system (RDS) and sensor. Failure to use properly sized wiring and circuit breaker Do not operate system until refrigerant detection system is may result in property damage.
  • Page 25 ROUTING HIGH VOLTAGE, GROUND AND CONTROL WIRING HIGH VOLTAGE / GROUND WIRES WIRE RUN LENGTH AWG# INSULATION TYPE Any excess high voltage field wiring should be LESS THAN 100' (30 METERS) TEMPERATURE RATING trimmed and secured away from any low voltage field MORE THAN 100' (30 METERS) 16 35ºC MINIMUM.
  • Page 26 HIGH PRESSURE SWITCH (S4) — LIQUID LINE CRANKCASE HEATER (HR1) INTEGRATED CRANKCASE THERMOSTAT FIGURE 16. Typical Factory Wiring Diagram – -018, -024, -030, -036, -048, and -060 Units Only Page 26...
  • Page 27 USED FOR: -042 MODEL (ECM MOTOR) (FAN WIRING ONLY) FIGURE 17. Typical Factory Wiring – -042 Units Only Page 27...
  • Page 28: System Operation

    HIGH PRESSURE SWITCH (S4) at a moderate pressure (less than 50psi). If the ML13KC1 units are equipped with a high-pressure switch coil cannot be cleaned using water alone, Lennox that is factory-wired and located in the liquid line.
  • Page 29: Start-Up And Performance Checklist

    General System Test with System Operating 2. The technician will check the refrigerant charge per the charging sticker information on the outdoor unit. 1. Your technician should perform a general system test. He will turn on the air conditioner to check operating 3.
  • Page 30: Typical Field Wiring

    Typical Field Wiring OUTDOOR DUAL TIMED OFF CAPACITOR CONTROL PURPLE TO 24 VAC POWER BLACK SOURCE 20 VA MINIMUM ORANGE NEC CLASS 2 YELLOW BLACK BLACK COMPRESSOR COMPRESSOR CONTACTOR BLACK GROUND BLACK 208-230/ 60/1 GROUND CRANKCASE HEATER YELLOW BLACK YELLOW YELLOW K1-1 208-230/ 60/ 1...
  • Page 31: Servicing Units Delivered Void Of Charge

    OUTDOOR DUAL TIMED OFF CAPACITOR CONTROL GREEN TO 24 VAC POWER SOURCE 20 VA MINIMUM NEC CLASS 2 YELLOW BLACK BLACK COMPRESSOR COMPRESSOR CONTACTOR BLACK GROUND BLACK 208-230/ 60/1 GROUND CRANKCASE HEATER YELLOW BLACK YELLOW YELLOW K1-1 208-230/ 60/ 1 HIGH PRESSURE ORANGE...
  • Page 32: Unit Start-Up

    7 - Set the thermostat for a cooling demand. Turn on Unit Start-Up power to the indoor unit and close the outdoor unit disconnect switch to start the unit. IMPORTANT 8 - Recheck voltage while the unit is running. Power If unit is equipped with a crankcase heater, it should must be within range shown on the nameplate.
  • Page 33: Charging

    R454B refrigerant cylinder to deliver liquid refrigerant. Charging ML13KC1 unit is factory-charged with enough R454B re- Verify the unit is electrically grounded before charging the frigerant to accommodate a 15-foot length of refrigerant system. Extreme care shall be taken not to overfill the re- piping.
  • Page 34 ADDING OR REMOVING REFRIGERANT This system uses R-454B which operates at slightly lower pressures than HFC-410A. The pre-installed liquid line filter drier is approved for use with R-454B. Do not replace it with components designed for use with HCFC-22. Check airflow using the Delta-T (DT) process using the illustration in figure 21.
  • Page 35 WEIGH IN CALCULATING SYSTEM CHARGE FOR OUTDOOR UNIT VOID OF CHARGE If the system is void of refrigerant, first, locate and repair any leaks and then weigh in the refrigerant charge into the unit. To calculate the total refrigerant charge: Adjust amount.
  • Page 36 1. Confirm proper airflow across coil using figure 65ºF START: Measure outdoor ambient temperature 2. Compare unit pressures with normal operating (18.3ºC) and pressures provided on applicable charging Above sticker as reference in table 1. USE WEIGH IN METHOD DO NOT CHARGE UNIT 3.
  • Page 37 TABLE 4. R-454B Temperature – Pressure (Psig) R-454B Refrigerant Pressure-Temperature Chart Saturated Saturated Saturated Saturated Saturated Saturated Saturated Saturated Pressure Pressure Pressure Pressure Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor (psig) (psig) (psig) (psig) Temp (°F) Temp (°F) Temp (°F) Temp (°F) Temp (°F) Temp (°F)
  • Page 38: Important

    ML13KC1 Charging Procedures AIR CONDITIONER CHARGING INFORMATION FOR COMPLETE CHARGING PROCEDURES, REFER TO THE APPLICABLE INSTALLATION AND SERVICE MANUAL AVAILABLE ONLINE Capacity -018 -024 -030 -036 -042 -048 -060 Table 1. Normal Operating Pressures¹ °F(°C)² TXV System – Liquid Line ( ± 10 psig) / Suction Line ( ± 5 psig)

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