Lennox International Inc XC21 Charging, Start−Up Checklists, TWO−STAGE Compressor Performance

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Charging

The XC21 unit is factory−charged with enough HFC−410A refrigerant to accommodate a 15−foot length of refrigerant

piping. Charge should be checked and adjusted using the

tables provided on the charging procedure sticker on the

unit access panel. Detailed information is given in the

XC21 Installation and Service Procedures manual, which is available on DaveNet.

Start−Up Checklists

TWO−STAGE COMPRESSOR PERFORMANCE

Use this procedure to verify part- and full-load capacity op-

eration of the two-stage compressor.

IMPORTANT !

This performance check is ONLY valid on systems that have clean indoor and outdoor coils, proper airflow over coils, and correct system refrigerant charge. All components in the system must be functioning properly to correctly perform compressor operational check. (Accurate measurements are critical to this test as indoor system loading and outdoor ambient can affect variations between low and high capacity readings).

TOOLS REQUIRED

SRefrigeration gauge set

SDigital volt/amp meter

SElectronic temperature thermometer

SOn-off toggle switch

PROCEDURE

1. Turn main power OFF to outdoor unit.

2.Adjust room thermostat set point 5ºF above (heating operation) or 5ºF below (cooling operation) the room temperature.

3.Remove control access panel. Install refrigeration gauges on unit. Attach the amp meter to the common (black wire) wire of the compressor harness. Attach thermometer to discharge line as close as possible to the compressor.

4.Turn toggle switch OFF. Install switch in series with Y2 wire from room thermostat. (See note ** in the Field Operational Checklist on page 17).

5.Cycle main power ON.

6.Allow pressures and temperatures to stabilize before taking any reading (may take up to 10 minutes).

7.Record all of the readings for the Y1 demand.

8.Close switch to energize Y2 demand. Verify power is going to compressor solenoid (see note ** in the Field Operational Checklist on page 17).

9.Allow pressures and temperatures to stabilize before taking any reading (may take up to 10 minutes).

10.Record all of the readings with the Y1 and Y2 demand.

11.If temperatures and pressures change in the direction noted in chart, the compressor is properly modulating from low to high capacity. (If no amperage, pressures or temperature readings change when this test is per- formed, the compressor is not switching between low and high capacity and replacement is necessary.)

12.After testing is complete, return unit to original set up.

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Contents −− Setting the Unit −− Clearances General−− Setting the Unit −− Unit Placement Unit Dimensions − Inches MMAccess View Side ViewPlacement Stabilizing Unit on Uneven SurfacesSlab Mounting Refrigerant Line SETPressor Liquid Line Service Valve Stub END Distributor Tubes TWO−PIECE Patch PlateUncased Coil only Expansion−− Refrigerant Piping −− Brazing Procedures CAP and Core RemovalWrap Service Valves Flow NitrogenBraze Line SET 7PREPARATION for Next StepSensing Bulb Installation Indoor Expansion Valve InstallationEqualizer Line Installation −− Leak Test and Evacuation Lowhigh Manifold Gauge SET Outdoor Unit To Vapor−− Leak Test and Evacuation LOW HighSAE TEE with Swivel Coupler Minimum 3/8 Hose−− Electrical −− Circuit Sizing and Wire Routing Size Circuit and Install Disconnect 1SWITCH2INSTALL Thermostat 24VAC Transformer3A. Route Control Wires Ting Route Control Wires Ting4ROUTE High Voltage and Ground Wires Wiring Entry Points−− Electrical −− Outdoor Control A175 Jumpers and Terminals J3 ALL UnitsHP only J4 TWO−STAGE Heat Pump only J2−− Electrical −− Field Control Wiring Flat metal jumperOn−board link Start−Up Checklists ProcedureCharging TWO−STAGE Compressor PerformanceXC21 Field Operational Checklist Cooling Mode Heating ModeSTART−UP Checks SubcoolingHomeowner Information Outdoor Coil

Dave Lennox Signature Collection XC21 System, XC21 specifications

Lennox International Inc. has long been synonymous with innovative heating and cooling solutions. One of the standout products in their lineup is the Dave Lennox Signature Collection XC21 System, a central air conditioning unit renowned for its remarkable efficiency, advanced technology, and superior performance.

The XC21 features Lennox’s proprietary Signature Series components, ensuring that homeowners receive top-tier comfort with energy-saving capabilities. One of the main highlights of the XC21 is its impressive SEER (Seasonal Energy Efficiency Ratio) rating of up to 21. This high rating signifies exceptional energy efficiency, allowing homeowners to save significantly on energy bills while maintaining a comfortable indoor environment.

One of the key technologies incorporated into the XC21 is the variable-speed compressor. This feature enables the system to adjust its cooling output in response to the current temperature and humidity levels, providing optimal comfort without excessive energy consumption. The variable-speed operation allows for quieter performance, with sound levels as low as 65 decibels, making it one of the quietest systems available.

Furthermore, the XC21 is designed with the Advanced Energy Efficiency feature, which enhances its capability to regulate energy usage intelligently. This is complemented by the Smart Away feature, allowing the unit to enter energy-saving mode when the homeowner is away, ensuring that no energy is wasted during times of inactivity.

Additionally, the XC21 is built with durable and high-quality materials, including a galvanized steel cabinet that resists rust and corrosion, ensuring longevity and consistent performance in varied weather conditions. It also includes a unique design that allows for easier maintenance and serviceability, minimizing downtime and repair costs.

The XC21 system is compatible with the iComfort S30 smart thermostat, which offers advanced climate control capabilities through Wi-Fi connectivity. This feature allows users to manage their home’s heating and cooling system remotely, providing convenience and enhancing energy efficiency.

In summary, the Dave Lennox Signature Collection XC21 System exemplifies Lennox International Inc.’s commitment to cutting-edge technology, energy efficiency, and customer satisfaction. Its innovative features, high energy efficiency ratings, and user-friendly characteristics make it an excellent choice for homeowners looking to enhance their comfort while reducing energy expenses.
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