Table of Contents
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©2024 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
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, or service agency.
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.
IMPORTANT: Special procedures are required for clean-
ing the all-aluminum coil in this unit. See page 20 in this
instruction for information.
STEP 1 – SETTING THE UNIT – Clearances
See
NOTES
NOTICE: Specific applications may require adjustment of the listed installation clearances to provide protection for
the unit from physical damage or to avoid conditions which limit operating efficiency. (Example: Clearances may
have to be increased to prevent snow or ice from falling on the top of the unit. Additional clearances may also be
required to prevent air recirculation when the unit is installed under a deck or in another tight space.)
See NOTES
NOTES -
Service clearance of 30 in. (762 mm) must be maintained on one of
the sides adjacent to the control box.
Clearance to one of the other three sides must be 36 in. (914 mm).
See
Clearance to one of the remaining two sides may be 12 in. (305
NOTES
mm) and the final side may be 6 in. (152 mm).
A clearance of 24 in. must be maintained between two units.
CONTROL
48 in. (1219 mm) clearance required on top of unit.
See NOTES
BOX
INSTALLATION
INSTRUCTIONS
Merit
Series ML13KC1 Units
®
AIR CONDITIONER
508491-01
8/2024
General
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.
Charging information is given on the charging
procedure sticker on the unit access panel. For
more in-depth information, consult the Installation
and Service Procedures manual, available on
LennoxPros.com or through the Technical Support
department at 800-453-6669.
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.
NOTE – This unit ML13KC1 is a PARTIAL UNIT AIR CON-
DITIONER, complying with PARTIAL UNIT requirements
of this Standard, and must only be connected to other
units that have been confirmed as complying to corre-
sponding PARTIAL UNIT requirements of this Standard,
UL 60335-2-40/CSA C22.2 No. 60335-2-40, or UL 1995/
CSA C22.2 No 236.
Page 1
NOTICE!
CAUTION
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Table of Contents
Related Manuals for Lennox Merit ML13KC1-018-230
Summary of Contents for Lennox Merit ML13KC1-018-230
- Page 1 INSTALLATION INSTRUCTIONS ©2024 Lennox Industries Inc. Dallas, Texas, USA Merit Series ML13KC1 Units ® AIR CONDITIONER 508491-01 8/2024 General 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.
- 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.
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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: Unit Dimensions - Inches (Mm)
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 5: Step 2 - Refrigerant Piping
FIGURE 2 Take care to empty all existing traps. Polyolester (POE) oils are used in Lennox units charged with R-454B refrigerant. Residual mineral oil can act as an insulator, preventing proper heat transfer. It can also clog the expansion device and reduce system performance and capacity. - Page 6 Flush the existing line set per the following instructions. Secondary Sensor Installation For more information, refer to the Installation and Service If secondary refrigerant sensor is required, it shall be Procedures manual available on LennoxPros.com. CAU- mounted as follows: TION - DO NOT attempt to flush and re-use existing line Upflow Applications: Mounted on an unused side furnace sets or indoor coil when the system contains contaminants return air connection at least 9 inches above the floor and...
- Page 7 LIQUID LINE FILTER DRIER INSTALLATION WARNING The provided filter drier must be field installed outdoors in Every working procedure that affects safety means shall the liquid line between the units liquid line service valve and before the liquid line enters the structure. It is not rec- only be carried out by competent persons.
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Page 8: Installation
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 9 STEP 2 – REFRIGERANT PIPING – (Continued) TYPICAL EXISTING FIXED ORIFICE TYPICAL EXISTING EXPANSION VALVE REMOVAL REMOVAL PROCEDURE PROCEDURE (UNCASED COIL SHOWN) (UNCASED COIL SHOWN) STUB END TWO-PIECE PATCH PLATE LIQUID LINE CHECK DISTRIBUTOR TUBES (UNCASED COIL ONLY) ORIFICE EXPANSION LIQUID LINE ORIFICE HOUSING HOUSING VALVE...
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Page 10: Cap And Core Removal
STEP 2 – REFRIGERANT PIPING – Brazing Procedures 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 vapor and liquid line service of the line. -
Page 11: 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 vapor valve stem port. - Page 12 STEP 2 – REFRIGERANT PIPING – Install Indoor Expansion Valve This outdoor unit is designed for use in systems that include an expansion valve metering device (purchased separately) at the indoor coil. See the ML13KC1 Product Specifications bulletin (EHB) for approved expansion valve kit match-ups and application information.
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Page 13: Step 3 - Leak Test And Evacuation
STEP 3 – LEAK TEST AND EVACUATION LEAK TEST HIGH MANIFOLD GAUGE SET OUTDOOR UNIT TO VAPOR SERVICE VALVE NOTE - Position canister to deliver liquid refrigerant. NITROGEN R-454B CONNECT GAUGE SET A - Connect the high pressure hose of an R-454B manifold gauge set to the vapor valve service port. NOTE - Normally, the high pressure hose is connected to the liquid line port. -
Page 14: Evacuate The System
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 liquid line service valve... -
Page 15: Electrostatic Discharge
Electrostatic discharge can affect electronic components. Take care REFRIGERANT DETECTION SYSTEM during unit installation and service to Unit must be installed with Lennox Approved Refrigerant protect the unit’s electronic controls. ELECTROSTATIC detection system (RDS) and sensor. Precautions will help to avoid control... - Page 16 STEP 4 – ELECTRICAL – (Continued) – High Voltage and Field Control Wiring The following illustration provides an example of control wiring connections when using a standard thermostat. 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...
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Page 17: Step 5 - Unit Start-Up
STEP 5 – UNIT START-UP TABLE 2 TORQUE REQUIREMENTS IMPORTANT Parts Recommended Torque Service valve cap 8 ft.-lb. 11 NM If unit is equipped with a crankcase heater, it should be energized 24 hours before unit start-up to prevent Sheet-metal screws 16 in.-lb. -
Page 18: Operating Angle-Type Service Valve
Charging OPERATING ANGLE-TYPE SERVICE VALVE 1 - Remove stem cap with an appropriately sized wrench. Verify the unit is electrically grounded before charging the system. Extreme care shall be taken not to overfill the re- 2 - Use a service wrench with a hex-head extension (3/16" for liquid line valve sizes and 5/16"... - Page 19 Leak Detected mode upon test completion. filter, if necessary. Heating Demand • Have your Lennox dealer show you where your indoor 1 - Prompt a heating demand at the thermostat. unit filter is located. It will be either at the indoor unit...
- Page 20 2 - Check the cleanliness of outdoor fan and blade any time the unit is in operation. If you are unsure about condition (cracks) and clean or replace them, if the filter required for your system, call your Lennox dealer necessary. for assistance.
- Page 21 General System Test with System Operating • the recovery process is supervised at all times by a competent person; 1 - Your technician should perform a general system test. They will turn on the air conditioner to check • recovery equipment and cylinders conform to the ap- propriate standards.
- Page 22 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) Temp (°F) Temp (°F) ‐58.9 ‐57.1 58.9 61.3 93.0 95.4 113.4 115.6 ‐19.2 ‐17.2...
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Page 23: Start Up Checks
ML13KC1 Start-Up and Performance Checklist Customer Address Indoor Unit Model Serial Outdoor Unit Model Serial Notes: START UP CHECKS Refrigerant Type: Rated Load Amps: Actual Amps Rated Volts Actual Volts Condenser Fan Full Load Amps Actual Amps: COOLING MODE Suction Pressure: Liquid Pressure: Supply Air Temperature: Ambient Temperature: Return Air: Temperature:...
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