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©2020 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
General
This SL28XCV outdoor air conditioner with all-aluminum
coil is designed for use with HFC-410A 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
SL28XCV
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
CLEARANCE ON ALL SIDES — INCHES (MILLIMETERS)
6 (152)
12 (305)
36 (914)
MINIMUM CLEARANCE BETWEEN TWO UNITS
Communicating
thermostat
NOTES:
Clearance to access panel must be 30
CONTROL
inches (762mm).
PANEL ACCESS
Clearance to one of the other three
LOCATION
30 (762)
sides must be 36 inches (914mm).
Clearance to one of the remaining two
sides may be 12 inches (305mm) and
the final side may be 6 inches
(152mm).
Note: Dimensions are not to scale.
24
(610)
INSTALLATION
INSTRUCTIONS
Dave Lennox Signature
Collection SL28XCV System
AIR CONDITIONER
508022-01
3/2020
PACKING LIST
GROMMETS (2) BUSHING (1)
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 20 in this
instruction for information.
LINE SET
CONNECTIONS
Page 1
®
WARRANTY
RAST 6-PIN
CARD
CONNECTOR (1)
WARNING
MINIMUM CLEARANCE
ABOVE UNIT
48 (1219)
ACCESS
PANEL
REAR VIEW OF UNIT
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Table of Contents
Related Manuals for Lennox Dave Lennox Signature SL28XCV
Summary of Contents for Lennox Dave Lennox Signature SL28XCV
- Page 1 INSTALLATION INSTRUCTIONS ©2020 Lennox Industries Inc. Dallas, Texas, USA Dave Lennox Signature ® Collection SL28XCV System THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE AIR CONDITIONER General 508022-01 3/2020 This SL28XCV outdoor air conditioner with all-aluminum coil is designed for use with HFC-410A refrigerant only.
- Page 2 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 3: Unit Dimensions - Inches (Mm)
UNIT DIMENSIONS – INCHES (MM) UNIT SUPPORT FEET 26-7/8 (683) 16-7/8 (429) 8-3/4 (222) 3-3/4 (95) 30-3/4 3-1/8 4-5/8 (781) (79) (117) BASE WITH ELONGATED LEGS 4.430 ELECTRICAL SUCTION LIQUID 18.59 8.04 1.000 UNIT DIM A DIM B DIM C DIM D DIM E SL28XCV-024... - Page 4 Take result in damage to roof surface. care to empty all existing traps. Polyvinyl ether (PVE) oils are used in Lennox units charged with HFC-410A IMPORTANT refrigerant. Residual mineral oil can act as an insulator, preventing proper heat transfer.
- Page 5 The SL28XCV 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 6 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 SL28XCV* L15-65-30 30 feet (9.1 m) 89J60 -024 L15-65-40 40 feet (12.2 m)
- Page 7 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...
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Page 8: Cap And Core Removal
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 9 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 10 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 SL28XCV Product Specifications bulletin (EHB) for approved expansion valve kit match-ups and application information.
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Page 11: 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 HFC-410A CONNECT GAUGE SET A - Connect the high pressure hose of an HFC-410A manifold gauge set to the vapor valve service port. NOTE - Normally, the high pressure hose is connected to the liquid line port. - Page 12 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 13 WARNING ELECTRICAL – Circuit Sizing and Wire Routing Fire Hazard. Use of aluminum wire with this product may result in a fire, causing property damage, severe injury In the U.S.A., wiring must conform with current local codes and the current National Electric Code (NEC). In Canada, or death.
- Page 14 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 15 FIGURE 10. Typical Field Wiring Page 15...
- Page 16 FIGURE 11. Typical Factory Wiring Page 16...
- Page 17 ROUTE CONTROL WIRES ELECTRICAL (CONTROL WIRING) TYPICAL CONTROL BOX Maximum length of wiring (18 gauge) for all connections on AND LINE SET INLETS USE BUSHING AND GROMMETS the RSBus is 1500 feet (457 meters). Wires should be color- PROVIDED IN BAG º...
- Page 18 DATS (Optional) OATS (Optional) SL28XCV RAST 6-Pin Connectors Communicating SL28XCV Indoor Unit Outdoor Unit HD Display S30 Smart Hub Subbase or Mag-Mount FIGURE 12. SL28XCV with iComfort S30 Communicating Thermostat – Field Wiring Diagram Page 18...
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Page 19: Unit Start-Up
6 - Connect manifold gauge set for testing and charging psi. Gauge hoses must be rated for use at up to 800 psig or use the Lennox Dealer Setup App to monitor the of pressure with a 4000 psig burst rating. - Page 20 The unit can be operated at maximum capacity by entering the test mode at the S30 (VALVE STEM SHOWN CLOSED) thermostat or using the Lennox Dealer Setup App. INSERT HEX WRENCH HERE The S30 Test Mode can be selected by going to Menu>...
- Page 21 NOTICE ! filter, if necessary. Failure to follow instructions will cause damage to • Have your Lennox dealer show you where your indoor the unit. unit filter is located. It will be either at the indoor unit (installed internal or external to the cabinet) or behind This unit is equipped with an aluminum coil.
- Page 22 Outdoor Unit 5 - Inspect and clean indoor coil, if necessary. 1 - Inspect component wiring for loose, worn or 6 - Inspect the condition of the refrigerant lines and damaged connections. Also check for any rubbing confirm that pipes are not rubbing copper-to- or pinching of wires.
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Page 23: Start Up Checks
SL28XCV Start-Up and Performance Checklist Customer Address Indoor Unit Model Serial Outdoor Unit Model Serial Notes: START UP CHECKS Refrigerant Type: Input 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:...