Lennox International Inc 2SCU13 warranty Subcooling Values for Fixed Orifice or TXV Systems

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Charge Using Weigh-In Method (Fixed Orifice/TXV Systems)

If the system is void of refrigerant, or if the outdoor ambient temperature is cool, first locate and repair any leaks then use the weigh-in method to charge the unit.

1.Recover the refrigerant from the unit.

2.Conduct a leak check, then evacuate as previously outlined.

3.Weigh in the charge according to the total amount shown on the unit nameplate.

If weighing facilities are not available or if unit is being charged during warm weather, follow one of the other procedures outlined below.

Charge Using Subcooling Method (Fixed Orifice/TXV Systems) – Outdoor Temperatures 65°F or Above

If charging a fixed orifice or TXV system when the outdoor ambient temperature is 65°F or above, the subcooling method can be used to charge the unit.

1.With the manifold gauge hose on the liquid service port and the unit operating stably, use a digital ther- mometer to record the liquid line temperature.

2.At the same time, record the liquid line pressure reading.

3.Use a temperature/pressure chart for HCFC-22 to determine the saturation temperature for the liquid line pressure reading.

4.Subtract the liquid line temperature from the satura- tion temperature (according to the chart) to determine subcooling.

_____ ° Saturation Temperature °F

–_____ ° Liquid Line Temperature °F = _____ ° Subcooling Value °F

5.Compare the subcooling value with those shown in Table 6. If subcooling is greater than shown, recover some refrigerant. If subcooling is less than shown, add some refrigerant.

Charge Using Superheat Method (Fixed Orifice Systems) – Outdoor Temperatures 65°F or Above

1.With the manifold gauge hose on the suction service port and the unit operating stably, use a digital ther- mometer to record the suction line temperature.

2.At the same time, record the suction line pressure reading.

# 48283B006

Subcooling Values for

Fixed Orifice or TXV Systems

Outdoor

 

Liquid Subcooling (±1°F)

 

Temp.

 

 

 

 

 

 

 

-18

-24

-30

-36

-42

-48

-60

°F

 

 

 

 

 

 

 

 

65

13

13

7

14

15

9

13

 

 

 

 

 

 

 

 

75

10

11

5

13

13

9

12

85

8

10

5

11

11

9

11

 

 

 

 

 

 

 

 

95

7

10

4

9

9

9

10

105

6

9

3

8

7

9

9

 

 

 

 

 

 

 

 

115

3

6

2

6

5

8

8

 

 

 

 

 

 

 

 

Table 6

3.Use a temperature/pressure chart for HCFC-22 to determine the saturation temperature for the suction line pressure reading.

4.Subtract the saturation temperature (according to the chart) from the suction line temperature to determine the superheat.

_____ ° Suction Line Temperature °F

–_____ ° Saturation Temperature °F = _____ ° Superheat Value °F

5.Compare the superheat value with those shown in Table 7 on page 12. If superheat is greater than shown, add some refrigerant. If superheat is less than shown, recover some refrigerant.

Charge Using Approach Method (TXV Systems)

– Outdoor Temperatures 65°F or Above

The following procedure is intended as a general guide and is for use on expansion valve systems only. For best results, indoor temperature should 70°F to 80°F. Monitor system pressures while charging.

1.Record outdoor ambient temperature using a digital thermometer.

2.Attach high pressure gauge set and operate unit for several minutes to allow system pressures to stabilize.

3.Compare stabilized pressures with those provided in Table 9 on page 13. Minor variations in these pres- sures may be expected due to differences in installa- tions. Significant differences could mean that the system is not properly charged or that a problem exists with some component in the system.

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Contents Table of Contents Installation and Maintenance InstructionsSlab Mounting InstallationInstallation Clearances Torque TableThermostat Designations Electrical WiringSlab Mounting Wind Barrier ConstructionRefrigerant Line Set Diameters Outside Unit Placement InstallationInstalling Refrigerant Line Brazing Connection ProcedureRefrigerant Line Sets Transition from Vertical to Horizontal Refrigerant Line Sets Installing Horizontal RunsExpansion Valve Systems Refrigerant Metering DeviceFixed Orifice Systems Fixed Orifice Data Metering Device InstallationTo Access the Schrader Port To Open Liquid or Suction Line Service ValveLeak Testing Ball Type Service Valve Valve OpenTo Close Liquid or Suction Line Service Valve Suction Line Ball Type Service ValveEvacuation Refrigerant Charging Refrigerant Charge AdjustmentSTART-UP Outdoor Liquid Subcooling ±1F Temp Charge Using Weigh-In Method Fixed Orifice/TXV SystemsSubcooling Values for Fixed Orifice or TXV Systems Model Check Charge Using Normal Operating PressuresApproach Values for TXV Systems Outdoor Ambient Temp SuperheatFixed Orifice RFC Normal Operating PressuresIndoor Unit MaintenanceOperation Indoor CoilStart-Up and Performance Checklist Single Phase Wiring Diagram P/N Three Phase Wiring Diagram P/N Limited Warranty

2SCU13 specifications

Lennox International Inc. is renowned for its innovation in heating, ventilation, air conditioning, and refrigeration (HVACR) systems. One of its standout products is the 2SCU13 model, which embodies the company's commitment to energy efficiency and customer comfort. This air conditioning unit is particularly appreciated in both residential and light commercial applications for its robust performance and advanced features.

The 2SCU13 is designed with a focus on energy efficiency, boasting a SEER rating of up to 14. This not only eases the burden on utility bills but also aligns with environmentally conscious practices by reducing carbon footprints. The unit’s efficiency is further enhanced by its scroll compressor, which is known for reliable performance and quiet operation.

One of the key characteristics of the 2SCU13 is its two-stage cooling system. This technology allows the unit to operate at two different cooling capacities, adapting to varying temperature conditions. By running at a lower capacity during mild weather, the 2SCU13 minimizes energy consumption, while still ensuring optimal comfort during hotter days by ramping up to full capacity when needed. This adaptability also contributes to a more consistent temperature throughout the space being cooled.

Another notable feature is the unit's humidity control capabilities. The two-stage operation also aids in managing indoor humidity levels, making it an excellent choice for areas with high humidity. Proper humidity control not only enhances comfort but also plays a crucial role in improving indoor air quality.

The design of the 2SCU13 ensures durability and longevity. It comes equipped with a rugged cabinet that withstands the elements, along with a baked-on powder coat finish that resists rust and corrosion. The unit also includes a protective grille that serves to shield the coil from debris, further enhancing its lifespan.

With easy installation and maintenance in mind, Lennox has incorporated service-friendly features into the design of the 2SCU13. The unit includes a convenient access panel that simplifies routine checks and repairs, making it easier for homeowners and technicians alike.

Overall, Lennox International Inc. 2SCU13 represents a harmonization of efficiency, comfort, and durability, making it a noteworthy choice among HVAC systems. Its advanced technology and design features ensure that it meets the evolving needs of consumers while providing reliable performance for years to come.
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