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©2024 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
General
These units are designed for use in residential and light
commercial type buildings.
This unit uses R454B, which is an ozone-friendly HFC
refrigerant. The unit must be installed with a matching
indoor coil and line set. A filter drier approved for use with
R454B is installed in the unit.
The EL18KSLV variable capacity unit is installed with a
standard 24VAC non-communicating 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. Consult author-
ities having jurisdiction before installation.
NOTE – This unit EL18KSLV is a PARTIAL UNIT HEAT
PUMP, complying with PARTIAL UNIT requirements of
this Standard, and must only be connected to other units
that have been confirmed as complying to corresponding
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.
NOTE – The EL18KSLV units are programmed from the
factory to function in 2, 3 and 5 ton modes of operation.
The 5 ton units are field convertible to 4 ton to efficiently
perform for the required application. If the intended ca-
pacity is 4 ton, refer to Programming Unit Type on page
22 and the Control Board DIP SW5 on page 23.
INSTALLATION
INSTRUCTIONS
Elite
Series EL18KSLV Units
®
HEAT PUMP
508700-01
12/2024
Operating Range
Cooling: 5°F to 125°F
Heating: -22°F to 75°F
• When the outdoor temperature drops below -22°F
(-30°C), the unit will stop running. The unit will turn
back on automatically when the temperature rises
above the lowest limit.
• It is recommended to have a secondary heating
source(s) available in case the temperature drops be-
low the operating range.
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.
This unit must be installed with an approved indoor air
handler or coil. For AHRI Certified system match-ups and
expanded ratings, visit www.LennoxPros.com.
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.
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.
Page 1
WARNING
WARNING
CAUTION
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Related Manuals for Lennox Elite EL18KSLV
Summary of Contents for Lennox Elite EL18KSLV
- Page 1 INSTALLATION INSTRUCTIONS ©2024 Lennox Industries Inc. Dallas, Texas, USA Elite Series EL18KSLV Units ® HEAT PUMP 508700-01 12/2024 Operating Range Cooling: 5°F to 125°F Heating: -22°F to 75°F • When the outdoor temperature drops below -22°F (-30°C), the unit will stop running. The unit will turn back on automatically when the temperature rises above the lowest limit.
- Page 2 WARNING WARNING Every working procedure that affects safety means • Do not use means to accelerate the defrosting pro- cess or to clean, other than those recommended by shall only be carried out by competent persons. This the manufacturer. appliance is not to be used by persons (including children) with reduced physical, sensory or mental •...
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Page 3: Refrigerating System
NOTE – Table is based on the configuration where the discharge port and air return port in the room is higher than 2.2m. NOTE – Multiply values in TAmin table by the Altitude Adjustment Factors to correct TAmin based on installed altitude. Altitude Adjustment Factor Altitude (m) 1000... - Page 4 CAUTION IMPORTANT Some soaps used for leak detection are corrosive to When breaking into the refrigerant circuit to make certain metals. Carefully rinse piping thoroughly after repairs – or for any other purpose – conventional leak test has been completed. Do not use matches, procedures shall be used.
- Page 5 WARNING WARNING For your safety, the information in this manual RISK OF ELECTRIC SHOCK. Could cause injury or must be followed to minimize the risk of fire, elec- death. tric shock, or personal injury. • An adequate ground is essential before connecting •...
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Page 6: Setting The Unit
SETTING THE UNIT Indoor Coil TXV Selection Building The outdoor section must be matched to a factory ap- Structure proved indoor section. It is mandatory that the install- er ensure that the correct TXV is installed in the indoor section. Reference Refrigerant Piping - Typical Existing Discharge Air Fixed Orifice Removal Procedure. -
Page 7: Front View
Unit Dimensions – Inches (mm) 40-3/16 (1021) 14-5/8 (372) 36-1/4 (920) (762) FRONT VIEW 17-1/8 (435) SIDE VIEW 26 (660) -024 UNITS 15-13/16 (401) BOTTOM VIEW 43-1/8 (1095) 15-3/4 (400) 41-3/8 (1050) 33-1/16 (840) FRONT VIEW 19-7/8 (505) SIDE VIEW 26-9/16 (675) -036 UNITS 18-1/8... -
Page 8: Side View
Unit Dimensions – (Cont’d) 15-3/4 (400) 41-3/8 (1050) 45-3/8 (1153) 19-7/8 (505) FRONT VIEW SIDE VIEW 26-9/16 (675) -060 UNIT 18-1/8 (460) BOTTOM VIEW NOTICE! WARNING Roof Damage! To prevent personal injury, as well as damage to This system contains both refrigerant and oil. panels, unit or structure, observe the following: Some rubber roofing material may absorb oil, While installing or servicing this unit, carefully stow all... -
Page 9: Refrigerant Piping
Polyvinyl ether (PVE) oils are used in property damage, personal injury or death. Lennox units charged with R454B refrigerant. Residual WARNING mineral oil can act as an insulator, preventing proper heat transfer. - Page 10 TABLE 1. Refrigerant Charge and Pipe Length Information Service Valve Connection Refrigerant Line Sizes System Sizes Refrig. For Liquid Max. Maximum Maximum Model Charge Line Length System Vertical Suction Line Liquid Line Pipe Length Suction Line Liquid Line (oz.)* (oz/ft) Charge (oz) Length (ft) Connection...
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Page 11: Flushing Procedure
Line Set Installation – Removing Existing Indoor Metering Device 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... - Page 12 NOTE: Tubing extension is included with the unit and comes attached to the service valves. Line Set Installation – Pipe Cutting and Flaring Conventional Line Set Installation: Pip Step 3: Flaring Step 1: Cutting Proper flaring is essential to achieve an airtight seal. 1.
- Page 13 Line Set Installation – Pipe Connection • Attach the flare nuts to the outdoor service valve.Torque • Add additional refrigerant charge if needed before you the fittings according to the specifications shown in the open outdoor service valves torque chart below. •...
- 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 sepa- rately) at the indoor coil. See the EL18KSLV Product Specifications bulletin (EHB) for approved expansion valve kit match-ups and application information.
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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 R454B CONNECT GAUGE SET A - Connect the high pressure hose of an R454B manifold gauge set to the vapor valve service port. NOTE - Normally, the high pressure hose is connected to the liquid line port. - Page 16 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...
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Page 17: Electrostatic Discharge
ELECTROSTATIC will help to avoid control exposure of three minutes to prevent compressor short cycling. DISCHARGE electrostatic discharge The Lennox M30, CS7500, CS3000 and many other (ESD) putting unit, control commercially available electronic thermostats provide Precautions and and the technician at the same this feature. -
Page 18: Thermostat Connection
SIZE CIRCUIT AND INSTALL SERVICE INSTALL THERMOSTAT DISCONNECT SWITCH Install room thermostat (ordered separately) on an inside Refer to the unit nameplate for minimum circuit ampacity, wall approximately in the center of the conditioned area and maximum fuse or circuit breaker (HACR per NEC). and 5 feet (1.5m) from the floor. - Page 19 RDS Wiring Diagrams for Heat Pumps RDS Wiring Diagrams for Single Stage Heat Pump with Air Handler Two Stage RDS Sensor Thermostat OPTIONAL Variable Speed Gas Furnace N.C. CONDENSATE FLOAT SWITCH SENSOR #1 SENSOR #2 RDS Field Kit – 24 Volt Cat # (27A02) TSTAT INDOOR...
- Page 20 Constant Torque/ RDS Sensor Thermostat OPTIONAL Variable Speed Air Handler N.C. CONDENSATE FLOAT SWITCH SENSOR #1 SENSOR #2 RDS Field Kit – 24 Volt Cat # (27A02) TSTAT INDOOR ALARM ZONING Defrost NO COM NC NO COM NC Tempering Thermostat / Outdoor Unit Terminal Block (BLACK) Indoor Unit Terminal Block (BLUE) O R C Y1 Y2 A Dual Fuel Thermostat is Required for Dual Fuel Applica on &...
- Page 21 Single Stage Furnace/ RDS Sensor Thermostat OPTIONAL PSC Air Handler N.C. CONDENSATE FLOAT SWITCH SENSOR #1 SENSOR #2 RDS Field Kit – 24 Volt Cat # (27A02) TSTAT INDOOR ZONING ALARM Defrost NO COM NC NO COM NC Tempering Thermostat / Outdoor Unit Terminal Block (BLACK) Indoor Unit Terminal Block (BLUE) O R C Y1 Y2 A Dual Fuel Thermostat is Required for Dual Fuel Applica on &...
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Page 22: Liquid Line
Outdoor Unitary Control DIP and Terminals LP/HP:Low/high pressure switch Crankcase Base pan heater heater Tc:Condensing Temp.Sensor Ts:Condensing Suction Temp.Sensor Reactor CON1 Ta:Ambient Temp.Sensor CON2 Td:Compressor Discharge Temp.Sensor Te:Condensing out Temp.Sensor PD:High pressure sensor BW Y CN21 4WV:4 Way valve Compressor CN26 terminal block... - Page 23 █ -024 █ █ █ -036 5_1_ ODU Tonnage █ █ █ █ -048 █ █ █ █ -060 (default for -060 units) Reserved Communication Mode 24V control 24V control IDU set 24V Control IDU 1 For AHU Test & Use energy efficiency testing and IDU 2 For Coil + Furnace Test &...
- Page 24 COOLING HEATING Dehum. 1 Dehum. 2 Heating Defrost DEFAULT HEATING+DEFAULT DEFAULT COOLING DEFROST █ █ █ █ █ DEFAULT HEATING+STRONG DEFAULT COOLING DEFROST █ █ █ COMFORT HEATING OR FULL- █ DEFAULT COOLING LOAD AIRFLOW RATE <300 █ █ █ SCFM/TON+DEFAULT DEFROST COMFORT HEATING OR FULL- █...
- Page 25 Indoor Unit Matches and Subcooling Charge Levels (TXV System) and Additional Charge (15 ft. Line set) Additional Additional Subcool Charge Subcool Charge Indoor Matchup Indoor Matchup Lbs/oz Lbs/oz 2 Ton HP 4 Ton HP CBK45UHP-018 6.0 1 lb 2 oz CBK45UHP-042 13.0 7.0 0 lb 11 oz...
- Page 26 Psig Psig Psig Psig Psig Psig Psig Psig °F °F °F °F °F °F °F °F TABLE 5. HFC-454B Temperature (°F) Pressure (Psig) Operating Temperature Pressures Minor variations in these pressures may be expected due to differences in installations. Significant differences could mean that the system is not properly charged or that a problem exists with some component in the system.
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Page 27: Unit Operation
6 - Connect manifold gauge set for testing and Unit Operation charging. EL18KSLV Unit Operation with a Conventional 7 - Turn on power to the indoor unit and close the 24VAC Non-Communicating 2-Stage Thermostat outdoor unit disconnect switch to start the unit. Start-up and testing should be performed with the When the EL18KSLV unit is installed with a convention- al 24VAC non-communicating 2-stage thermostat, a Y1... - Page 28 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"...
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Page 29: Homeowners Information
EL18KSLV unit is factory-charged with enough R454B Charging refrigerant to accommodate a 15-foot length of refriger- ant piping. For line lengths over 15 feet, add 2.75 oz of Verify the unit is electrically grounded before charging refrigerant for every 5 feet of piping beyond 15 feet. the system. -
Page 30: Professional Maintenance
• Have your Lennox dealer show you where your indoor Pre-Service Check unit filter is located. It will be either at the indoor unit If your system fails to operate, check the following be- (installed internal or external to the cabinet) or behind fore calling for service: a return air grille in the wall or ceiling. -
Page 31: Cooling Mode
General System Test with System Operating 6 - Inspect the condition of the refrigerant lines and confirm that pipes are not rubbing copper-to- 1 - Your technician should perform a general system copper. Also, ensure that refrigerant pipes are not test.
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I'm trying to find info about operating/setting the heat pump when we are gone for 2 weeks living in the Seattle area. I can't find this info