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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.
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.
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.
IMPORTANT: Special procedures are required for clean-
ing the all-aluminum coil in this unit. See page 29 in this
instruction for information.
SETTING THE UNIT – Clearances
See NOTES
See
NOTES
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. (305mm)
NOTES
and the final side may be 6 in.(152 mm).
A clearance of 24 in. (610 mm) must be maintained between two units.
48 in. (1219 mm) clearance required on top of unit.
Control
Box
Page 1
INSTALLATION
INSTRUCTIONS
Elite
Series EL18KCV Units
®
AIR CONDITIONER
508698-01
10/2024
PACKING LIST
WARRANTY
CERTIFICATE
OUTDOOR UNIT
General
This EL18KCV outdoor air conditioner with all-aluminum
coil is designed for use with R454B 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. The EL18KCV
variable capacity unit may be installed with an S40 com-
municating thermostat or a standard 24VAC non-commu-
nicating cooling thermostat. See field wiring diagrams for
wiring details. These instructions are intended as a general
guide and do not supersede local codes in any way. Con-
sult authorities having jurisdiction before installation.
NOTICE!
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 on LennoxPros.com or through the
Technical Support department at 800-453-6669.
NOTE – This unit EL18KCV 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.
RAST 6-PIN
CONNECTORS (2)
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Table of Contents
Related Manuals for Lennox Elite EL18KCV Series
Summary of Contents for Lennox Elite EL18KCV Series
- Page 1 INSTALLATION INSTRUCTIONS ©2024 Lennox Industries Inc. Elite Series EL18KCV Units ® Dallas, Texas, USA AIR CONDITIONER 508698-01 10/2024 PACKING LIST WARRANTY CERTIFICATE RAST 6-PIN CONNECTORS (2) OUTDOOR UNIT THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE General...
- Page 2 WARNING CAUTION • Do not use means to accelerate the defrosting pro- Under no circumstances shall potential sources of cess or to clean, other than those recommended by ignition be used in the searching for or detection of the manufacturer. refrigerant leaks.
- Page 3 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 IMPORTANT IMPORTANT The minimum test pressure for the low side of the Ensure that the area is in the open or that it is adequately system shall be the low side design pressure and the ventilated before breaking into the system or conducting minimum test pressure for the high side of the system any hot work.
-
Page 5: Unit Dimensions - Inches (Mm)
NOTE – R454B is a A2L refrigerant. The system installation WARNING must meet the following parameters based upon total refrigerant charge (line set included). TAmin (Total minimum conditioned If this appliance is conditioning a space with an area area)is the minimum allowable conditioned area based upon the smaller than TAmin or stored in a space with an area total system charge at sea level. -
Page 6: Step 2 - Refrigerant Piping
Take care to empty all existing traps. Polyvinyl ether (PVE) and polyol ester (POE) oils are used in Lennox variable-capacity units charged with R454B refrigerant. Residual mineral oil can act as an insulator, preventing proper heat transfer. - Page 7 If a new line set is being installed, size the piping per table 1. NOTE - When installing refrigerant lines longer than 50 feet, refer to the Refrigerant Piping Design and Fabrica- TABLE 1 tion Guidelines manual available on LennoxPros.com REFRIGERANT LINE SET –...
- Page 8 NOTE – Maximum lifts are dependent on total length, • Over 150 Linear Feet: not recommended. number of elbows, etc. that contribute to total pressure • Additional oil is not required for systems with line lengths drop. up to 150 feet. •...
- Page 9 TABLE 2. Standard Refrigerant Line Set – Up to 50 Linear Feet in Length Inches (mm) Valve Size Connections Recommended Line Sets Liquid Line Suction Line L15 Line Set Model Line Set Length Catalog Number EL18KCV* -024 3/8” (10 mm) 3/4”...
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Page 10: 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 11: Flushing Procedure
STEP 2 – REFRIGERANT PIPING – (Continued) STUB END TWO-PIECE PATCH PLATE LIQUID LINE CHECK (UNCASED COIL ONLY) ORIFICE EXPANSION HOUSING VALVE DISTRIBUTOR TUBES ® TEFLON RING ® TEFLON TYPICAL EXISTING EXPANSION VALVE REMOVAL SENSING RING PROCEDURE (UNCASED COIL SHOWN) LINE DISTRIBUTOR EQUALIZER... -
Page 12: Cap And Core Removal
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 13: 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 14 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 EL18KCV Product Specifications bulletin (EHB) for approved expansion valve kit match-ups and application information.
-
Page 15: Leak Test And Evacuation
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 16: 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 17 (2) RAST 6-Pin connections in the installation instruction REFRIGERANT DETECTION SYSTEM bag for connecting the field low voltage control wiring to Unit must be installed with Lennox Approved Refrigerant the EL18KCV harnesses in the low voltage control make- detection system (RDS) and sensor.
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Page 18: Disconnect Switch
EL18KCV Thermostat Control Options Qty. of EL18KCV Field Wiring Thermostat Type Indoor Unit Type Wires to Terminal Strip Unit Operation Diagram EL18KCV Connections S40 Communicating Comunicating Gas Fully Communicating Variable Capacity R, I+, I-, C Figure 13 Thermostat Furnace or Air Handler Operation Based Upon Thermostat Demand Conventional 24VAC Any Furnace or Air... - Page 19 ROUTE CONTROL WIRES Communicating Thermostat Wiring Maximum length of wiring (18 gauge) for all connections on the RSBus is 1500 feet (457 meters). Wires should be color-coded, with º º a temperature rating of 95 F (35 C) minimum, and solid-core (Class II Rated Wiring). All low voltage wiring must enter unit through field-provided field-installed grommet installed in electrical inlet.
- Page 20 EL18KCV DATS (Optional) RAST 6-Pin Connectors OATS (Optional) Communicating Indoor Unit EL18KCV Outdoor Unit HD Display S40 Smart Hub Subbase or Mag-Mount PROVIDED RAST 6-PIN CONNECTOR INDOOR CONTROL Indoor Control Single Wire To C Terminal Single Wire To C Terminal Unused Wires Unused Wires FIGURE 13.
- Page 21 5 – Outdoor Unitary Control - Jumpers and Terminals 7 SEGMENT DISPLAY CHARGE MODE JUMPER (CHRG MODE) CHARGE MODE AND OPERATION MODE JUMPER DETAIL OPERATION MODE JUMPER PUSH BUTTON RAST TERMINALS FOR THERMOSTAT WIRING CONNECTION stalled on the Charge Mode Pins after providing a Y1 cool- Outdoor Control 7 Segment Display and ing demand to the EL18KCV to initiate the Charge Mode.
- Page 22 FIGURE 14. Typical Field Wiring Page 22...
- Page 23 FIGURE 15. Typical Factory Wiring Page 23...
- Page 24 Communicating Thermostat with Indoor and Outdoor Units FIGURE 16. EL18KCV with S40 Communicating Thermostat – Field Wiring Diagram with RDS Controller. Page 24...
- Page 25 FIGURE 17. Conventional 24VAC Cooling Non-Communicating Thermostat Wiring with RDS Controller Page 25...
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Page 26: Unit Start-Up
3 - After evacuation is complete, open the liquid line and Unit Operation vapor line service valve stems to release the refrigerant charge (contained in outdoor unit) into the system. EL18KCV Unit Operation with a S40 Communicating Thermostat 4 - Replace the stem caps and tighten to the value listed in table 5. -
Page 27: Operating Angle-Type Service Valve
IMPORTANT OPERATING ANGLE-TYPE SERVICE VALVE 1 - Remove stem cap with an appropriately sized wrench. To prevent stripping of the various caps used, the 2 - Use a service wrench with a hex-head extension (3/16" for liquid appropriately sized wrench should be used and fitted line valve sizes and 5/16"... - Page 28 EL18KCV unit is factory-charged with enough R454B re- Charging frigerant to accommodate a 15-foot length of refrigerant piping. For line lengths over 15 feet, add 3 oz of refrigerant Verify the unit is electrically grounded before charging the for every 5 feet of piping beyond 15 feet. system.
- Page 29 Failure to follow instructions will cause damage to filter, if necessary. the unit. • Have your Lennox dealer show you where your indoor This unit is equipped with an aluminum coil. unit filter is located. It will be either at the indoor unit...
- Page 30 3 - Check the cleanliness of indoor blower and clean 9 - If your air conditioner is matched with a gas- or blower, if necessary. oil-fired furnace for auxiliary heating, indoor unit service will also include inspection and cleaning of 4 - Inspect the indoor coil drain pans and condensate the burners, and a full inspection of the gas valve, drains for rust, debris, obstructions, leaks or cracks.
- Page 31 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 32: Start Up Checks
EL18KCV 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:...
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