Lennox International Inc 2SCU13 warranty Evacuation

Page 9

2.With both manifold valves closed, connect the cylin- der of HCFC-22 refrigerant. Open the valve on the HCFC-22 cylinder (vapor only).

3.Open the high pressure side of the manifold to allow HCFC-22 into the line set and indoor unit. Weigh in a trace amount of HCFC-22. (A trace amount is a maximum of 2 oz. of refrigerant or 3 lbs. pressure.) Close the valve on the HCFC-22 cylinder and the valve on the high pressure side of the manifold gauge set. Disconnect the HCFC-22 cylinder.

4.Connect a cylinder of nitrogen with a pressure regulat- ing valve to the center port of the manifold gauge set.

When using high pressure gas such as nitrogen for this purpose, be sure to use a regulator that can control the pressure down to 1 or 2 psig.

5.Adjust nitrogen pressure to 150 psig. Open the valve on the high side of the manifold gauge set to pressur- ize the line set and the indoor coil.

Evacuation

Evacuating the system of noncondensables is critical for proper operation of the unit. Noncondensables are defined as any gas that will not condense under temperatures and pressures present during operation of an air conditioning system. Noncondensables and water vapor combine with refrigerant to produce substances that corrode copper piping and compressor parts.

5.Evacuate the line set and indoor unit to a minimum of 500 microns or lower. During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once to determine if there is a rapid rise in pressure. A rapid rise in pressure indicates a relatively large leak. If this occurs, the leak testing procedure must be repeated.

6.When 500 microns or lower is maintained, close the manifold gauge valves, turn off the vacuum pump, and disconnect the manifold gauge center port hose from the vacuum pump. Attach the manifold gauge center port hose to a nitrogen cylinder with pressure regulator set to 150 psig and purge the hose. Open the manifold gauge valves to break the vacuum in the line set and indoor unit. Close the manifold gauge valves.

7.Shut off the nitrogen cylinder and remove the manifold gauge hose from the cylinder. Open the manifold gauge valves to release the nitrogen from the line set and indoor unit.

8.Reconnect the manifold gauge to the vacuum pump, turn the pump on, and continue to evacuate the line set and indoor unit until 500 microns is maintained within a 20-minute period after shutting off the vacuum pump and closing the manifold gauge valves.

9.When the requirements above have been met, disconnect the manifold hose from the vacuum pump. Open the service valves to break the vacuum in the line set and indoor unit.

WARNING

Do not use a compressor to evacuate a sys- tem. Avoid deep vacuum operation. Extremely low vacuums can cause internal arcing and compressor failure. Danger of equipment damage. Damage caused by deep vacuum operation will void warranty.

Use a thermocouple or thermistor electronic vacuum gauge that is calibrated in microns. Use an instrument that reads down to 50 microns.

1.Connect the manifold gauge set to the service valve ports as follows:

•Low pressure gauge to suction line service valve

•High pressure gauge to liquid line service valve

2.Connect micron gauge.

3.Connect the vacuum pump (with vacuum gauge) to the center port of the manifold gauge set.

4.Open both manifold valves and start vacuum pump.

# 48283B006

Page 9

Page 8 Page 10
Image 9
Page 8 Page 10
Contents Table of Contents Installation and Maintenance InstructionsInstallation Clearances InstallationTorque Table Slab MountingSlab Mounting Electrical WiringWind Barrier Construction Thermostat DesignationsInstalling Refrigerant Line Outside Unit Placement InstallationBrazing Connection Procedure Refrigerant Line Set DiametersRefrigerant Line Sets Transition from Vertical to Horizontal Refrigerant Line Sets Installing Horizontal RunsRefrigerant Metering Device Fixed Orifice SystemsExpansion Valve Systems To Access the Schrader Port Metering Device InstallationTo Open Liquid or Suction Line Service Valve Fixed Orifice DataTo Close Liquid or Suction Line Service Valve Ball Type Service Valve Valve OpenSuction Line Ball Type Service Valve Leak TestingEvacuation Refrigerant Charge Adjustment START-UPRefrigerant Charging Charge Using Weigh-In Method Fixed Orifice/TXV Systems Subcooling Values for Fixed Orifice or TXV SystemsOutdoor Liquid Subcooling ±1F Temp Approach Values for TXV Systems Check Charge Using Normal Operating PressuresOutdoor Ambient Temp Superheat ModelFixed Orifice RFC Normal Operating PressuresOperation MaintenanceIndoor Coil Indoor UnitStart-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.
Top Page Image Contents