Lenox Elite Series, XC14 installation instructions Leak Test Line Set and Indoor Coil

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IMPORTANT

The Environmental Protection Agency (EPA) prohibits the intentional venting of HFC refrigerants during maintenance, service, repair and disposal of appliance. Approved methods of recovery, recycling or reclaiming must be followed.

IMPORTANT

Leak Test Line Set and Indoor Coil

WARNING

When using a high pressure gas such as dry nitrogen to pressurize a refrigeration or air conditioning system, use a regulator that can control the pressure down to 1 or 2 psig (6.9 to 13.8 kPa).

If this unit is being matched with an approved line set or indoor unit coil which was previously charged with mineral oil, or if it is being matched with a coil which was manufactured before January of 1999, the coil and line set must be flushed prior to installation. Take care to empty all existing traps. Polyol ester (POE) oils are used in Lennox units charged with HFC−410A refrigerant. Residual mineral oil can act as an insulator, preventing proper heat transfer. It can also clog the expansion device, and reduce the system performance and capacity.

Failure to properly flush the system per the instructions below will void the warranty.

IMPORTANT

Leak detector must be capable of sensing HFC refrigerant.

WARNING

Refrigerant can be harmful if it is inhaled. Refrigerant must be used and recovered responsibly.

Failure to follow this warning may result in personal injury or death.

1CONNECT GAUGE SET

AConnect an HFC−410A manifold gauge set high pressure hose to the vapor valve service port.

NOTE , 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.

BWith both manifold valves closed, connect the cylinder of HFC−410A refrigerant to the center port of the manifold gauge set.

NOTE Later in the procedure, the HFC−410A container will be replaced by the nitrogen container.

LOW

B

HIGH

MANIFOLD GAUGE SET

OUTDOOR UNIT

A

TO VAPOR

SERVICE VALVE

NITROGEN

HFC−410A

2TEST FOR LEAKS

After the line set has been connected to the indoor and outdoor units, check the line set connections and indoor unit for leaks. Use the following procedure to test for leaks:

A With both manifold valves closed, connect the cylinder of HFC−410A refrigerant to the center port of the manifold gauge set. Open the valve on the HFC−410A cylinder (vapor only).

B Open the high pressure side of the manifold to allow HFC−410A into the line set and indoor unit. Weigh in a trace amount of HFC−410A. [A trace amount is a maximum of two ounces (57 g) refrigerant or three pounds (31 kPa) pressure]. Close the valve on the HFC−410A cylinder and the valve on the high pressure side of the manifold gauge set. Disconnect the HFC−410A cylinder.

C Connect a cylinder of dry nitrogen with a pressure regulating valve to the center port of the manifold gauge set.

D Adjust dry nitrogen pressure to 150 psig (1034 kPa). Open the valve on the high side of the manifold gauge set in order to pressurize the line set and the indoor unit.

E After a few minutes, open one of the service valve ports and verify that the refrigerant added to the system earlier is measurable with a leak detector.

F After leak testing disconnect gauges from service ports.

Figure 12. Leak Test

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XC14 SERIES

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Contents General Table of ContentsShipping and Packing List AIR Conditioner230 Unit Dimensions − Inches mmModel Number Identification Control Panel Plumbing and Switches ComponentsTypical Unit Parts Arrangement Using Manifold Gauge SET Operating Gauge Set and Service ValvesOperating Service Valves Torque RequirementsOperating Ball Type Service Valve Operating Angle Type Service ValveTo Access Service Port Reinstall Stem Cap1DISCONNECT Power Recovering Refrigerant from Existing SystemRecovering Refrigerant 2CONNECT Manifold Gauge SETClearance on ALL Sides Unit PlacementPositioning Considerations Placing Unit on SlabDetail C Elevated Slab Mounting using Feet Extenders Detail a Outside Unit PlacementDetail D Slab Side Mounting Detail E Deck Top MountingLouvered Panel Installation Removing and Installing PanelsRoof Mounting Louvered Panel RemovalRefrigerant Line Set New or Replacement Line SetRefrigerant Line SET Refrigerant Line SET Alling Horizontal Runs Refrigerant Line SET From Vertical to HorizontalBrazing Connections 1CUT and Debur Brazing ProceduresFlow Nitrogen Wrap Service Valves6BRAZE Line SET 7PREPARATION for Next StepFlushing Line Set and Indoor Coil Installing Indoor Expansion ValveIndoor Expansion Valve Installation Installing Indoor Metering DeviceSensing Bulb Installation Equalizer Line InstallationLeak Test Leak Test Line Set and Indoor CoilEvacuating System Evacuating Line Set and Indoor Coil2INSTALL Thermostat Size Circuit and Install DisconnectElectrical 24VAC TransformerVAC Control Wiring Diagrams Field Installed Typical Factory Wiring Diagram Interlink Compressor Typical Unit Wiring Diagram Servicing Units Delivered Void of Charge Connections for Testing and ChargingUnit Start−Up System RefrigerantWhich indoor Determining Charge MethodMetering Device?Calculating System Charge for Outdoor Unit Void of Charge Checking AIR Flow AT Indoor CoilBelow AboveSHº Superheat Values +/−5ºF 40ºFUnit Components System OperationNormal Operating Pressures Liquid +10 and Suction +5 psig Indoor Unit MaintenanceIndoor Coil Unit Nameplate ActualInstaller City Start−Up and Performance ChecklistJob Name Job no Date Job Location City State

Elite Series, XC14 specifications

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