Advertisement

Quick Links

©2024 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
General
This SL25KCV 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
SL25KCV
NOTE – This unit SL25KCV 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 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.
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 SL25KCV System
AIR CONDITIONER
508447-01
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 24 in this
instruction for information.
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.
NOTE – Carefully transport the unit from the truck to the
installation site using a dolly.
Once at the installation site, the unit can be handled with
or without a dolly to place it at the desired location.
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
WARRANTY
CARD
CONNECTOR (1)
WARNING
®
RAST 6-PIN

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the Signature SL25KCV024 and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Summary of Contents for Lennox Signature SL25KCV024

  • Page 1 INSTALLATION INSTRUCTIONS ©2024 Lennox Industries Inc. Dallas, Texas, USA Dave Lennox Signature ® Collection SL25KCV System THIS MANUAL MUST BE LEFT WITH THE AIR CONDITIONER HOMEOWNER FOR FUTURE REFERENCE 508447-01 General 8/2024 This SL25KCV outdoor air conditioner with all-aluminum PACKING LIST coil is designed for use with R454B refrigerant only.
  • Page 2 WARNING WARNING To prevent serious injury or death: Every working procedure that affects safety means shall 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: 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 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 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 INSTALL UNIT AWAY FROM WINDOWS FROM BUILDING STRUCTURE. BUILDING STRUCTURE MOUNTING SLAB TWO 90°...
  • 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 Polyvinyl ether (PVE) oils are used in DO NOT remove line set caps or service valve stub caps Lennox units charged with R454B refrigerant. Residual until you are ready to make connections. mineral oil can act as an insulator, preventing proper heat transfer.
  • Page 9 NOTE – Length is general guide. Lengths may be more or • Between 51 and 150 Linear Feet: Crankcase heater and nonbleed port TXV factory installed. No additional less, depending on remaining system design factors. components required. Vertical vapor riser must be sized •...
  • Page 10 Secondary Sensor Installation Horizontal Applications: Mounted on the bottom side re- turn furnace air connection within 9 inches of both the If secondary refrigerant sensor is required, it shall be blower deck and front of furnace. mounted as follows: Connect the refrigerant sensor to the second sensor in- Upflow Applications: Mounted on an unused side furnace put on the RDS Control.
  • 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: 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 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 under the valve body to protect the base paint. WARNING FIRE, PERSONAL INJURY, OR PROPERTY DAMAGE FLOW NITROGEN may result if you do not wrap a water-saturated cloth around both liquid and suction line service valve bodies and copper...
  • 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 SL25KCV 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 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 Jumpers and Terminals 7 SEGMENT DISPLAY CHARGE MODE JUMPER (CHRG MODE) CHARGE M OPERATIO JUMPER OPERATION MODE JUMPER PUSH BUTTON RAST TERMINALS FOR THERMOSTAT WIRING CONNECTION FIGURE 9 Outdoor Control 7 Segment Display and Charge Mode Jumper Push Button To initiate the SL25KCV Charge Mode function, install the jumper across the two Charge Mode Pins (CHRG MODE)
  • Page 19 CLASS II VOLTAGE FIELD WIRING TRANSDUCER DENOTES OPTIONAL COMPONENTS RT13 A188 NOTE- COOLING LENNOX IF ANY WIRE IN THIS APPLIANCE IS REPLACED,IT LOW PRESSURE CONDENSING MUST BE REPLACED WITH WIRE OF LIKE SIZE, TRANSDUCER RATING, INSULATION THICKNESS, AND TERMINATION. A168...
  • Page 20 FIGURE 11. Typical Factory Wiring Page 20...
  • Page 21 ROUTE CONTROL WIRES TYPICAL CONTROL BOX Maximum length of wiring (18 gauge) for all connections on the RSBus is 1500 feet (457 meters). Wires should be color- º º coded, with a temperature rating of 95 F (35 C) minimum, and solid-core (Class II Rated Wiring).
  • Page 22 FIGURE 12. SL25KCV with S40 Communicating Thermostat – Field Wiring Diagram with RDS Controller Page 22...
  • Page 23: Unit Start-Up

    6 - Connect manifold gauge set for testing and charging Gauge hoses must be rated for use at up to 800 psig of or use the Lennox Dealer Setup App to monitor the pressure with a 4000 psig burst rating.
  • Page 24: 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 2 - Use a service wrench with a hex-head extension (3/16" for liquid system. Extreme care shall be taken not to overfill the re- line valve sizes and 5/16"...
  • Page 25 S40 3 - Observe the following sequence: thermostat or using the Lennox Dealer Setup App. a. The LED indicator flashes the sequence for leak The S40 Test Mode can be selected by going to detection (flashing blue).
  • Page 26 Aluminum coils may be damaged by exposure to solutions with a pH below 5 or above 9. The alumi- • Have your Lennox dealer show you where your indoor num coil should be cleaned using potable water unit filter is located. It will be either at the indoor unit (in- at a moderate pressure (less than 50psi).
  • Page 27 7 - Check outdoor fan motor for worn bearings/ Prior to the task being carried out, an oil and refrigerant sample shall be taken in case analysis is required prior to bushings. Replace as necessary. re-use of recovered refrigerant. It is essential that electri- 8 - Inspect and clean outdoor coils, if necessary and cal power is available before starting decommissioning.
  • Page 28: Start Up Checks

    SL25KCV 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:...
  • Page 29 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...

Table of Contents