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©2024 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
General
This SL22KLV outdoor air conditioner with all-aluminum
coil is designed for use with R454B refrigerant only.
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.
THIS UNIT IS A INTEGRAL COMPONENT OF A SYSTEM THAT
WILL REQUIRE A COMMUNICATING THERMOSTAT AND
COMMUNICATING AIR HANDLER OR FURNACE.
Communicating air handler
or furnace
SL22KLV
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.
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.)
Communicating
thermostat
See NOTES
See
NOTES
CONTROL
See NOTES
BOX
INSTALLATION
INSTRUCTIONS
Dave Lennox Signature
Collection SL22KLV System
HEAT PUMP
508501-01
8/2024
OUTDOOR UNIT
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: Special procedures are required for clean-
ing the all-aluminum coil in this unit. See page 26 in this
instruction for information.
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).
Clearance to one of the remaining two sides may be 12 in. (305
mm) and the final side may be 6 in. (152 mm).
A clearance of 24 in. must be maintained between two units.
48 in. (1219 mm) clearance required on top of unit.
Page 1
PACKING LIST
GROMMETS (2) BUSHING (1)
WARRANTY
CARD
CONNECTOR (1)
WARNING
®
RAST 6-PIN
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Related Manuals for Lennox Signature SL22KLV Series
Summary of Contents for Lennox Signature SL22KLV Series
- Page 1 INSTALLATION INSTRUCTIONS ©2024 Lennox Industries Inc. Dallas, Texas, USA Dave Lennox Signature ® Collection SL22KLV System THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE HEAT PUMP General 508501-01 8/2024 This SL22KLV outdoor air conditioner with all-aluminum coil is designed for use with R454B refrigerant only.
- Page 2 WARNING WARNING Every working procedure that affects safety means shall To prevent serious injury or death: only be carried out by competent persons. This appliance 1. Lock-out/tag-out before performing maintenance. is not to be used by persons (including children) with 2.
- Page 3 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 4 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 5 IMPORTANT IMPORTANT Verify cabling will not be subject to wear, corrosion, Pipe work, including piping material, pipe routing, excessive pressure, vibration, sharp edges or any other and installation shall include protection from physical adverse environmental effects. damage in operation and service, and be in compliance with national and local codes and standards, such as WARNING ASHRAE 15, ASHRAE 15.2, IAPMO Uniform Mechanical...
- Page 6 DETAIL A DETAIL B INSTALL UNIT AWAY FROM WINDOWS INSTALL UNIT LEVEL OR, IF ON A SLOPE, MAINTAIN SLOPE TOLERANCE OF 2 DEGREES (OR 2 INCHES PER 5 FEET [50 MM PER 1.5 M]) AWAY FROM BUILDING STRUCTURE. BUILDING STRUCTURE MOUNTING SLAB TWO 90°...
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Page 7: Unit Dimensions - Inches (Mm)
UNIT DIMENSIONS – INCHES (MM) INLET 4 (102) 4 (102) INLET INLET (660) (737) LIQUID LINE 6-1/4 CONNECTION (159) 4 (102) SUCTION LINE INLET CONNECTION 6-1/8 30-1/2 (156) (775) TOP VIEW (102) BOTTOM VIEW BASE SECTION (With Optional Standoff Kit) 39-3/4 (1010) 35-3/4 (908) (depth) - Page 8 Take care result in damage to roof surface. to empty all existing traps. Polyvinyl ether (PVE) oils are used in Lennox units charged with R454B refrigerant. IMPORTANT Residual mineral oil can act as an insulator, preventing proper heat transfer.
- Page 9 The SL22KLV is a variable-capacity cooling system uti- WARNING lizing variable speed compressor technology. With the variable speed compressor and variable pumping capac- Refrigerant can be harmful if it is inhaled. Refrigerant ity, additional consideration must be given to refrigerant must be used and recovered responsibly.
- Page 10 TABLE 1. Standard Refrigerant Line Set – Up to 50 Linear Feet Inches (mm) Valve Size Connections Recommended Line Sets Liquid Line Suction Line L15 Line Set Model Line Set Length Catalog Number SL22KLV* L15-65-30 30 feet (9.1 m) 89J60 3/8”...
- Page 11 REFRIGERANT PIPING – 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 HOUSING...
- Page 12 REFRIGERANT PIPING – Brazing Procedures CAP AND CORE REMOVAL PIPING PANEL REMOVAL / PREPARING LINE SET Remove service cap and core from both the suction / Remove piping panel to access service valves. Cut vapor and liquid line service ports. ends of the refrigerant lines square (free from nicks or dents) and debur the ends.
- Page 13 alloys and flux. 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 under the valve body to protect the base paint. FLOW NITROGEN WARNING Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration FIRE, PERSONAL INJURY, OR PROPERTY DAMAGE...
- Page 14 REFRIGERANT PIPING – Install Indoor Expansion Valve This outdoor unit is designed for use in systems that include an check/expansion valve metering device (purchased sep- arately) at the indoor coil. See the SL22KLV Product Specifications bulletin (EHB) for approved check/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 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 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 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. detection system (RDS) and sensor. ELECTROSTATIC Precautions will help to avoid control...
- Page 18 ELECTRICAL – Outdoor Control (A175) Jumpers and Terminals 7 SEGMENT DISPLAY PUMP DOWN – WHEN UNIT IS IN PUMP DOWN MODE, Pd WILL BE DISPLAYED ON 7-SEGMENT. TO ACTIVATE PUMP DOWN MODE, THE CONTROL MUST BE IN THE IDLE STATE, AND THE PUMP DOWN JUMPER PLACED ACROSS THE TWO PUMP DOWN PINS.
- Page 19 CLASS II VOLTAGE FIELD WIRING TRANSDUCER DENOTES OPTIONAL COMPONENTS RT13 RT21 S4 HIGH A188 PRESSURE HEAT PUMP SWITCH LENNOX LOW PRESSURE OUTDOOR UNIT TRANSDUCER YELLOW A168 SL22KLV Supersedes NOTE -IF ANY WIRE IN THIS APPLIANCE IS REPLACED,IT MUST BE REPLACED WITH WIRE OF LIKE SIZE, RATING, INSULATION THICKNESS, AND TERMINATION.
- Page 20 FIGURE 11. Typical Factory Wiring Page 20...
- Page 21 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 22 DATS (Optional) OATS (Optional) SL22KLV RAST 6-Pin Connectors Communicating SL22KLV Indoor Unit Outdoor Unit HD Display S40 Smart Hub Subbase or Mag-Mount FIGURE 14. SL22KLV with S40 Communicating Thermostat – Field Wiring Diagram Page 22...
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Page 23: Unit Start-Up
Table 1 lists torque values for fasteners. 6 - Connect manifold gauge set for testing and charging TABLE 1 – TORQUE REQUIREMENTS or use the Lennox Dealer Setup App to monitor the Parts Recommended Torque pressures and temperatures of the refrigeration system. - Page 24 ACCESS SERVICE PORT OPERATING BALL-TYPE SERVICE VALVE A service port cap protects the service port core from contamination 1 - Remove stem cap with an appropriately sized wrench. and serves as the primary leak seal. 2 - Use an appropriately sized wrench to open. To open valve, rotate stem counterclockwise 90°.
- Page 25 S40 stallation and Setup Guide for complete details on how to thermostat or using the Lennox Dealer Setup App. integrate this unit into a communicating system. The S40 Test Mode can be selected by going to High Pressure Switch (S4) Menu>...
- Page 26 • Have your Lennox dealer show you where your indoor Pre-Service Check unit filter is located. It will be either at the indoor unit (in- If your system fails to operate, check the following before stalled internal or external to the cabinet) or behind a re- calling for service: turn air grille in the wall or ceiling.
- Page 27 Indoor Unit (Air Handler or Furnace) 7 - Inspect the duct system for leaks or other problems. Repair or replace as necessary. 1 - Inspect component wiring for loose, worn or damaged connections. Confirm proper voltage plus 8 - Check for bearing/bushing wear on indoor blower amperage of indoor unit.
- Page 28 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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