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Lennox SL25KCV Series Unit Information

Lennox SL25KCV Series Unit Information

Outdoor units
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Service Literature
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, service agency, or the gas supplier.
IMPORTANT
This unit must be matched with an indoor coil as specified
with AHRI. For AHRI Certified system match-ups and
expanded ratings, visit www.LennoxPros.com. Coils
previously charged with HCFC-22 must be flushed.
WARNING
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.
WARNING
Electric Shock Hazard. Can cause injury or
death. Unit must be properly grounded in
accordance with national and local codes.
Line voltage is present at all components when
unit is not in operation on units with single-
pole contactors. Disconnect all remote electric
power supplies before opening access panel.
Unit may have multiple power supplies.
UNIT INFORMATION
SL25KCV (R454B) SERIES OUTDOOR UNITS
Corp. 100102
January 20, 2025

Table of Contents

Model Number Identification ...........................................2
Specifications ................................................................3
Electrical Data ...............................................................3
Unit Dimensions - Inches (mm) ....................................4
Typical Unit Parts Arrangement .....................................5
Installation ......................................................................9
Unit Placement ..............................................................9
Setting the Unit - Clearances..........................................9
Removing and Installing Panels ...................................16
New or Replacement Line Set ......................................17
Brazing Connections ...................................................21
Flushing Line Set and Indoor Coil ................................24
Leak Testing the System .............................................26
Evacuating Line Set and Indoor Coil ...........................28
Outdoor Control 7 Segment Display and Push Button 31
Alarms .........................................................................31
Charge Mode Jumper ...................................................31
Unit Start-Up ...............................................................35
System Operation and Service ...................................35
Configuring Unit ............................................................45
S40 Thermostat ............................................................46
System Overview..........................................................46
Diagnostic Information .................................................46
er Setup App .................................................................46
Maintenance .................................................................46
Unit Wiring Diagrams....................................................48
Unit Sequence of Operation ........................................51
Component Testing .......................................................54
System Configuration ...................................................66
Unit Operation ..............................................................66
System Refrigerant .......................................................75
Decomissioning ............................................................80
SL25KCV Advanced Diagnostics ................................81
Where electrical components are being changed, they
shall be fit for the purpose and to the correct specification.
At all times the manufacturer's maintenance and service
guidelines shall be followed. If in doubt, consult the
manufacturer's technical department for assistance.
Page 1
SL25KCV
IMPORTANT

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  • Page 1: Table Of Contents

    HCFC-22 must be flushed. System Overview............46 WARNING Diagnostic Information ..........46 Installer Test – Using the S40 Thermostat or Lennox Deal- er Setup App ..............46 To prevent serious injury or death: Maintenance ..............46 1. Lock-out/tag-out before performing maintenance.

  • Page 2: Model Number Identification

    5 minutes after the power has been removed. Model Number Identification SL 25 K C V - 036 - 230 A 01 Product Tier SL = Dave Lennox Signature Revision Level ® Collection Nominal SEER...

  • Page 3: Specifications

    Specifications General Model No. SL25KCV-024 SL25KCV-036 SL25KCV-048 SL25KCV-060 Data Nominal Tonnage Connections Liquid line (o.d.) - in. (sweat) Suction line (o.d.) - in. 1-1/8 Refrigerant R454B charge furnished 11 lbs. 10 oz. 12 lbs 3 oz. 11 lbs. 12 oz. 12 lbs.

  • Page 4: 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 5: Typical Unit Parts Arrangement

    Typical Unit Parts Arrangement CONTROL PANEL SL25KCV-024, -036 OUTDOOR INVERTER CONTROL REACTOR INVERTER CONTACTOR SPST GROUND CONTROL PANEL SL25KCV-048, -060 OUTDOOR CONTROL INVERTER REACTOR CONTACTOR INVERTER SPST GROUND FIGURE 1. Control Panel Components Page 5...
  • Page 6 TYPICAL PLUMBING COMPONENTS COMPRESSOR CRANKCASE HEATER HIGH PRESSURE SWITCH LOW PRESSURE TRANSDUCER HIGH PRESSURE TRANSDUCER SERVICE VALVE SERVICE VALVE FIGURE 2. Component Locations – SL25KCV-024, 036, 048, 060 Page 6...

  • Page 7: Operating Gauge Set And Service Valves

    Gauge hoses must be rated for use at up to 800 psig of recess. pressure with a 4000 psig burst rating. See the Lennox Service and Application Notes #C-08-1 for further details and information. OPERATING SERVICE VALVES The liquid and vapor line service valves are used for re-...

  • Page 8: Service Valves

    SERVICE VALVES ANGLE AND BALL Operating Angle Type Service Valve: 1. Remove stem cap with an appropriately sized wrench. 2. Use a service wrench with a hex-head extension (3/16” for liquid line valve sizes and 5/16” for vapor line valve sizes) to back the stem out counterclockwise as far as it will go.

  • Page 9: Installation

    Installation PLACING UNIT ON SLAB Unit Placement When installing unit at grade level, the top of the slab See Unit Dimensions on page 4 for sizing mounting slab, should be high enough above grade so that water from platforms or supports. higher ground will not collect around the unit.

  • Page 10: Roof Mounting

    STABILIZING UNIT ON UNEVEN SURFACES CAUTION IMPORTANT Under no circumstances shall potential sources of ignition be used in the searching for or detection of Unit Stabilizer Bracket Use (field-provided): refrigerant leaks. A halide torch (or any other detector Always use stabilizers when unit is raised above the using a naked flame) shall not be used.
  • Page 11 CAUTION TABLE 3 Qmin Table Servicing shall be performed only as recommended by Refrigerant CFM Required Refrigerant CFM Required the manufacturer. Charge lb (kg) Charge lb (kg) 5 (2.3) 18 (8.1) WARNING 6 (2.7) 19 (8.6) If this appliance is conditioning a space with an area smaller than TAmin or stored in a space with an area 7 (3.2) 20 (9.1)

  • Page 12: 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 13 IMPORTANT IMPORTANT Verify cabling will not be subject to wear, corrosion, Work shall be undertaken under a controlled procedure excessive pressure, vibration, sharp edges or any other so as to minimize the risk of a flammable gas or vapor adverse environmental effects. being present while the work is being performed.
  • Page 14 IMPORTANT IMPORTANT Where electrical components are being changed, they Sealed electrical components shall be replaced. shall be fit for the purpose and to the correct specification. IMPORTANT At all times the manufacturer’s maintenance and service guidelines shall be followed. If in doubt, consult the Intrinsically safe components must be replaced.
  • Page 15 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 16: Removing And Installing Panels

    Removing and Installing Panels FIGURE 6. Removing and Installing Panels Page 16...

  • Page 17: New Or Replacement Line Set

    Polyvinyl ether (PVE) oils are used in stallation section). If all the systems in the same space Lennox units charged with R454B refrigerant. Residual are installed with direct vent application, then additional mineral oil can act as an insulator, preventing proper refrigerant detection sensor is not needed heat transfer.
  • Page 18 • Up to 50 Linear Feet: Use rated line sizes listed in table WARNING Polyvinyl ether (PVE) oils used with R454B refrigerant • Between 51 and 150 Linear Feet: Crankcase heater absorb moisture very quickly. It is very important that the and nonbleed port TXV factory installed.
  • Page 19 TABLE 6. 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 SL28XCV* -024 3/8” (10 mm) 3/4”...
  • Page 20 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 21: Brazing Connections

    IMPORTANT Brazing Connections Use the procedures outlined in figures 8 and 9 for brazing Allow braze joint to cool before removing the wet rag line set connections to service valves. from the service valve. Temperatures above 250ºF can damage valve seals. WARNING IMPORTANT Danger of fire.
  • Page 22 CAP AND CORE REMOVAL PIPING PANEL REMOVAL AND LINE SET PREPARATION Remove service cap and core from both the suction and liquid line service ports. Remove piping panel for easier access to service valves. Cut ends of the refrigerant lines square (free from nicks or dents) and debur the ends.
  • Page 23 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 suction / vapor valve stem port.

  • Page 24: Flushing Line Set And Indoor Coil

    Flushing Line Set and Indoor Coil TYPICAL EXISTING FIXED ORIFICE TYPICAL EXISTING EXPANSION VALVE REMOVAL REMOVAL PROCEDURE (UNCASED PROCEDURE (UNCASED COIL SHOWN) COIL SHOWN) STUB END TWO PIECE PATCH PLATE LIQUID LINE CHECK DISTRIBUTOR TUBES (UNCASED COIL ONLY) ORIFICE EXPANSION LIQUID LINE ORIFICE HOUSING HOUSING VALVE...
  • Page 25 FLUSHING LINE SET AND INDOOR COIL (2 OF 2) TYPICAL NEW CHECK EXPANSION VALVE INSTALLATION PROCEDURE THIS OUTDOOR UNIT IS DESIGNED FOR USE IN SYSTEMS THAT USE A CHECK EXPANSION VALVE METERING DEVICE. SEE THE UNIT PRODUCT SPECIFICATIONS FOR APPROVED EXPANSION VALVE KIT MATCH-UPS AND APPLICATION INFORMATION. THE EXPANSION VALVE UNIT CAN BE INSTALLED INTERNAL OR EXTERNAL TO THE INDOOR COIL.

  • Page 26: Leak Testing The System

    Take care WARNING to empty all existing traps. Polyvinyl ether (PVE) oils are used in Lennox variable-capacity units charged with Refrigerant can be harmful if it is inhaled. Refrigerant R454B refrigerant. Residual mineral oil can act as an must be used and recovered responsibly.

  • Page 27: Test For Leaks

    LEAK TEST NOTE - NORMALLY, THE HIGH PRESSURE HOSE IS CONNECTED TO THE LIQUID LINE PORT. HOWEVER, CONNECTING IT TO THE VAPOR PORT BETTER PROTECTS THE MANIFOLD GAUGE SET FROM HIGH PRESSURE DAMAGE. LINE SET AND INDOOR COIL HIGH MANIFOLD GAUGE SET CONNECT GAUGE SET CONNECT AN R454B MANIFOLD GAUGE SET HIGH PRESSURE HOSE TO THE VAPOR VALVE SERVICE PORT.

  • Page 28: Evacuating Line Set And Indoor Coil

    Evacuating Line Set and Indoor Coil CONNECT GAUGE SET HIGH NOTE — Remove cores from service valves (if not already done). Connect low side of manifold gauge set with 1/4 SAE in-line tee to vapor line service valve Connect high side of manifold gauge set to liquid R454B line service valve OUTDOOR MANIFOLD...

  • Page 29: Thermostat Control And Low Voltage Wiring

    Electrical Hazard rent Canadian Electrical Code (CEC). High Voltage Unit must be installed with Lennox approved Refrigerant Wait 5 minutes. Detection System (RDS) and sensor. Do not operate sys- Electrical components may hold charge.

  • Page 30: Install Thermostat

    SL25KCV and S40 Communicating Thermostat Wiring Summary Qty. of SL25KCV Field Wiring Thermostat Type Indoor Unit Type Wires to Terminal Strip Unit Operation Diagram SL25KCV Connections S40 Communicating Comunicating Gas Fully Communicating Variable Capacity R, I+, I-, C Figure 20 Thermostat Furnace or Air Handler Operation Based Upon Thermostat Demand...

  • Page 31: Electrical - Outdoor Control Jumpers And Terminals

    ELECTRICAL - Outdoor Control Jumpers and Terminals XXXX XXXX XXXX XXXX XXXX XXXX 7 SEGMENT DISPLAY CHARGE MODE JUMPER (CHRG MODE) OPERATION MODE JUMPER PUSH BUTTON RAST TERMINALS FOR THERMOSTAT WIRING CONNECTION FIGURE 14 Outdoor Control 7 Segment Display and Charge Mode Jumper Push Button To initiate the SL25KCV Charge Mode function, install the...
  • Page 32 TABLE 9 Outdoor Control Terminal Designations and Input /Outputs (see figure 15 for terminal locations) Designator Description Input Output Common O Reversing Valve Input (24VAC conventional Heat Switched 24VAC 24VAC Pump Thermostats only) nominal Unused on SL25KCV , for heat pump applications only 24VAC common Low pressure switch 24VAC nominal...
  • Page 33 FIGURE 15 Table 9 continued Outdoor Control Terminal Designations and Inputs / Outputs WARNING - Electric Shock Hazard. Can cause injury or death. Unit must be grounded in accordance with national and local codes. The 4 pins in P6 have the potential of transferring up to 250 volts to the unit cabinet ground. Designator Description Input...
  • Page 34 Charge Mode function. Can be used when charging, checking charge, pump down or check- ing unit operation. Unit will run at 100% capacity. Conventional 24VAC heat pump thermostat - Cooling mode 1. Provide a Y1 compressor demand and a O Re- versing Valve signal to the SL25KCV 2.

  • Page 35: Servicing Units Delivered Void Of Charge

    Servicing Units Delivered Void of Charge System Operation and Service 7-SEGMENT ALERT AND SYSTEM STATUS CODES If the outdoor unit is void of refrigerant, clean the system using the procedure described below. Alert codes are displayed using the 7-segment display lo- cated on the outdoor control.
  • Page 36 TABLE 10. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE – System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidifi- cation). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed.
  • Page 37 TABLE 10. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE – System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidifi- cation). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed.
  • Page 38 TABLE 10. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE – System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidifi- cation). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed.
  • Page 39 TABLE 10. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE – System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidifi- cation). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed.
  • Page 40 TABLE 10. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE – System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidifi- cation). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed.

  • Page 41: Power-Up / Reset

    POWER-UP / RESET: 7-SEGMENT POWER-UP DISPLAY STRING FIRMWARE VERSION: During initial power-up or reset, the first item displayed is the outdoor control firmware version. Example to the right shows firmware version 2.3. UNIT TYPE: The next item displayed is the self discovery unit type.
  • Page 42 TABLE 11. Outdoor Control 7-Segment Unit Status Displays Description Example of Display Idle Mode: Decimal point flashes at 1 Hz (0.5 second on, 0.5 second off). Idle Mode: Decimal point flashes at 1 Hz. Display OFF. Soft Disable Mode: Top and bottom horizontal line and decimal point flash at 1 Hz. If indoor or outdoor control displays Soft Disable code: 1) Confirm proper wiring between all devices (thermostat, indoor and outdoor).
  • Page 43 Control can be in Idle or demand mode: To enter display configuration option - A mode, push and hold button until solid – appears, release button. Display begins flashing. Within 10 seconds, push and hold button until required symbol A displays, release button. Display begins flashing. Within 10 seconds, push A in the display string represents the and hold button until display stops flashing, release button.
  • Page 44 TABLE 12. Field Test, Diagnostic Recall and Program Menu Options Display Display and action (normal operation) No Change - idle (*) No Change - idle (*) Solid . Enter or exit field test and program mode. Solid A Puts unit in diagnostic mode. (Displays ambient temperatures and any active error codes.) Solid c Clears error history (**) Solid E...

  • Page 45: Configuring Unit

    Configuring Unit When installing a replacement outdoor control, the unit selection code may have to be manually assigned using the 7-seg- ment display and push button on the control. The unit code sets unit type, capacity and outdoor fan profile. Configuring Unit Selection Code Power-up - Unit selection code (two-digit number) displayed represents unit size code (outdoor unit capacity).

  • Page 46: S40 Thermostat

    Reconfiguring Outdoor Control using Installer Test – Using the S40 Thermostat or Lennox Dealer Setup App S40 Thermostat Verify the proper operation of the system by running the If any component of the HVAC system is changed, e.g. Installer Test feature through the thermostat interface. Re- replacing an outdoor sensor, reconfiguring the system is fer to the applicable Installer System Setup Guide.
  • Page 47 1 - Clean or change filters. quently if it is exposed to substances which are corrosive 2 - Lennox blower motors are factory-lubricated and or which block airflow across the coil (e.g., pet urine, cot- permanently sealed. No more lubrication is needed.

  • Page 48: Unit Wiring Diagrams

    Unit Wiring Diagrams FIGURE 19. SL25KCV with S40 Communicating Thermostat – Field Wiring Page 48...
  • Page 49 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 50 FIGURE 21. Typical Factory Wiring Page 50...

  • Page 51: Unit Sequence Of Operation

    Unit Sequence of Operation The following figures illustrate the overall unit sequence of operation along with the operation of various pressure switches and temperature sensors. The figures also illustrate the use of the compressor anti-short-cycle function in relation to unit Status, unit Fault and lockout LED Codes and unit system operation interactions.
  • Page 52 SUCTION COOLING OR PRESSURE PRESSURE HEATING TRANSDUCER CUT-OUT IS CONTACTOR COMPRESSOR CLOSED CLOSED IGNORED FOR ENERGIZED DEMAND (A168) 90 SECONDS SWITCH IS CLOSED OR LOW PRESSURE OUTDOOR AMBIENT TRANSDUCER (A168) OPEN CLOSED TEMPERATURE IS 15ºF OR BELOW CONTACTOR DE-ENERGIZED The thermostat terminates demand when the contactor is de-energized.
  • Page 53 HIGH COOLING OR TOP CAP PRESSURE CONTACTOR HEATING CLOSED CLOSED SWITCH (S173) SWITCH (S4) ENERGIZED COMPRESSOR DEMAND HIGH PRESSURE CLOSED OPEN SWITCH (S4) CONTACTOR DE-ENERGIZED The thermostat terminates demand when the contactor is de-energized. If demand is satisfied when alarm is not active, the OPEN 5-strike counter resets.

  • Page 54: Component Testing

    Component Testing Component Testing Table of Contents Verifying High Pressure Switch and Low Pressure Protec- Top Cap Switch Operation ..........63 tion Operation ..............54 Reactor Operations ............64 Verifying Suction Pressure Transducer Operation..55 Outdoor Fan Operation...........64 Compressor Operation, Checkout and Status / Error Outdoor Control Operation ..........

  • Page 55: Verifying Suction Pressure Transducer Operation

    Verifying Suction Pressure Transducer Operation Using a multimeter set to VDC with the Suction Pressure Transducer connected to the "Suct P" 3-pin connector on the control board. Pin 1 (Red wire +5VDC) to Pin 3 (Black wire - GND) should read 5 VDC continuous. Pin 2 (Blue wire output from transducer) to Pin 3 (Black - GND) should read 0.5 to 4.5 VDC and will vary depending on suction pressure mea- sured.
  • Page 56 Verifying Liquid Pressure Transducer Operation Using a multimeter set to VDC with the Liquid Pressure Transducer connected to the "Liq P" 3-pin connector on the control board. Pin 1 (Red wire +5VDC) to Pin 3 (Black wire - GND) should read 5 VDC continuous. Pin 2 (Blue wire output from transducer) to Pin 3 (Black - GND) should read 0.5 to 4.5 VDC and will vary depending on liquid~ pressure measured.

  • Page 57: Compressor Operation, Checkout And Status / Error Codes

    High Pressure Switch and Low Pressure Protection Errors TABLE 15. Outdoor Control 7-Segment Display Alert Codes System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehu- midification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed.
  • Page 58 DISCHARGE LINE ELECTRICAL POWER CONNECTION SUCTION LINE TOP CAP THERMOSTAT SUCTION FILTER (STRAINER) SL25KCV R-SCROLL COMPRESSOR FIGURE 29. SL25KCV R-Scroll Compressor Detail Page 58...

  • Page 59: Status Codes

    STATUS CODES: When the compressor is running, the 7-segment display will show the demand as a percentage of compressor cooling or heating capacity, for example, C50 or H50. FIGURE 30. Compressor Operation, Checkout and Status/Error Codes ERROR CODES: TABLE 16. Outdoor Control 7-Segment Display Alert Codes - Compressor System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification).
  • Page 60 TABLE 16. Outdoor Control 7-Segment Display Alert Codes - Compressor System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert codes are also displayed on the S40 thermostat on systems installed with the S40 thermostat.

  • Page 61: Crankcase Heater, Checkout And Status / Error Codes

    Crankcase Heater, Checkout and Status / Error Codes OPERATION: CRANKCASE HEATER (HR1) Compressors on the SL25KCV-024 are equipped with a 25W crankcase heater and the remaining are equipped with a 40W crankcase heater. The heater prevents liquid from accumulating in the compressor. The heater is controlled by the crankcase heater thermostat.

  • Page 62: Status Code

    FIGURE 33. Checking Crankcase Heater Thermostat STATUS CODE: None ERROR CODES: None Compressor Sound Cover All units come with one or two soft-sided polyethylene molded outer shell compressor sound covers; an inner sound cover on the -024 and -036 units and an inner and outer sound cover on the -048 and -060 units. The covers help reduce any unwanted operating sounds from the compressor.

  • Page 63: Operation

    Top Cap Switch Operation, Checkout and Status / Error Codes OPERATION: Top Cap Thermal Sensor Switch (S173) These units are equipped with a compressor-mounted normally closed temperature switch that prevents compressor damage due to overheating caused by internal friction. The switch is located on top of the compressor casing. This switch senses the compressor casing temperature and opens at 230-248°F to shut off compressor operation.

  • Page 64: Reactor Operations

    Reactor Operations, Checkout and Status / Error Codes OPERATION: Reactor (Inductor or choke) is a passive two-terminal electrical component that stores energy in its magnetic field. Reac- tors are one of the basic components used in electronics where current and voltage change with time, due to the ability of inductors to delay and reshape alternating currents.

  • Page 65: Outdoor Control Operation

    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 66: System Configuration

    XXXX XXXX XXXX XXXX XXXX XXXX 7 SEGMENT DISPLAY CHARGE MODE JUMPER (CHRG MODE) OPERATION MODE JUMPER PUSH BUTTON RAST TERMINALS FOR THERMOSTAT WIRING CONNECTION FIGURE 40. Outdoor Control Unit STATUS CODES: TABLE 18. Outdoor Control 7-Segment Display Alert Codes - Outdoor Control Status NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidifi- cation).

  • Page 67: Unit Sensor Operations

    ERROR CODES: TABLE 19. Outdoor Control 7-Segment Display Alert Codes - Outdoor Control Errors NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidifi- cation). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed.
  • Page 68 PIN# / WIRE RESISTANCE VALUES TEMP RANGE ºF SENSOR SLEEVE COLOR RANGE (OHMS) (ºC) NONE 10K Ohms Nominal 6 AND 5 336,000 to 2,487 (see table -40 (-40) TO OUTDOOR 4 AND 3 16 on page 74 for exact 140 (60) AMBIENT (BLACK) temperature to ohm readings)
  • Page 69 TABLE 20. Ambient and Liquid Line Sensors Temperature / Resistance Range Resistance Resistance Resistance Resistance enheit enheit enheit enheit 136.3 2680 56.8 16657 21.6 44154 -11.3 123152 133.1 2859 56.0 16973 21.0 44851 -11.9 125787 130.1 3040 55.3 17293 20.5 45560 -12.6 128508...

  • Page 70: Dc Inverter Control Operation

    ERROR CODES: TABLE 21. Outdoor Control 7-Segment Display Alert Codes – Outdoor Control Errors NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert codes are also displayed on the S40 thermostat.
  • Page 71 ERROR CODES: TABLE 23. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidifi- cation). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed.
  • Page 72 TABLE 23. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidifi- cation). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed.
  • Page 73 TABLE 23. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidifi- cation). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed.
  • Page 74 TABLE 23. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidifi- cation). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed.

  • Page 75: System Refrigerant

    3 - Add or remove refrigerant using the weigh-in test mode at the S40 thermostat or by using the Lennox method shown in figure 46. Dealer Setup App. The S40 Test Mode can be selected 4 - Verify the charge using the subcooling method by going to Menu>Advanced Settings>...

  • Page 76: Indoor Coil

    MANIFOLD GAUGE SET HIGH GAUGE SET OUTDOOR UNIT CONNECTIONS FOR TESTING AND CHARGING REFRIGERANT TANK CHARGE IN LIQUID PHASE SUCTION LINE DIGITAL SCALE TO LIQUID TEMPERATURE SENSOR LINE SERVICE (LIQUID LINE) PORT TEMPERATURE SENSOR CLOSE MANIFOLD GAUGE SET VALVES AND CONNECT THE CENTER HOSE TO A CYLINDER OF R454B SET FOR LIQUID PHASE CHARGING. CONNECT THE MANIFOLD GAUGE SET'S LOW PRESSURE SIDE TO THE SUCTION LINE SERVICE PORT.
  • Page 77 Verify the unit is electrically grounded before charging the SL25KCV unit is factory-charged with enough R-454B re- system. Extreme care shall be taken not to overfill the re- frigerant to accommodate a 15-foot length of refrigerant frigerating system. piping. For line lengths over 15 feet, add 3 oz of refriger- ant for every 5 feet of piping beyond 15 feet.
  • Page 78 TABLE 24. R454B Temperature (°F) - Pressure (Psig) Note 1. R 454B is a zeotropic blend and must be charged with liquid refrigerant only. 2. Saturated liquid temperature is used to calculate liquid subcooling. 3. Saturated vapor temperature is used to to calculate suction superheat. 4.
  • Page 79 SL25KCV – R454B CHARGING PROCEDURE FOR COMPLETE CHARGING DETAILS, REFER TO THE OUTDOOR UNIT INSTALLATION AND SERVICE PROCEDURE 6 - Compare the subcooling value with those in table 1. If subcooling is greater IMPORTANT ! than shown, recover some refrigerant. If subcooling is less than shown, add Unit must be put in Test Mode so charging occurs with system operating at some refrigerant.

  • Page 80: Decomissioning

    D - Pump down refrigerant system, if possible. Decomissioning E - If a vacuum is not possible, make a manifold so that Before carrying out this procedure, it is essential that the refrigerant can be removed from various parts of the technician is completely familiar with the equipment and system.

  • Page 81: Sl25Kcv Advanced Diagnostics

    The advanced diagnostic information is available at the S40 under the Dealer Dashboard, in the Diagnostic The Lennox Dealer Setup App can be downloaded for free section of the Lennox Dealer Setup App and remotely on at the App Store for Apple smartphones and tablets or at LennoxPros Service Dashboard.
  • Page 82 LennoxPros Service Dashboard Page 82...
  • Page 83 Page 83...

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