Lennox International Inc Merit Series 14ACX Units Wrap Service Valves, Flow Nitrogen

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5

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. See steps 3A, 3B and 3C on manifold gauge set connections

6BRAZE LINE SET

Wrap both service valves with water saturated cloths as illustrated here and as mentioned in step 4, before brazing to line set. Water saturated cloths must remain water saturated throughout the brazing and cool−down process.

LIQUID LINE SERVICE VALVE

WHEN BRAZING LINE SET TO

SERVICE VALVES, POINT FLAME

AWAY FROM SERVICE VALVE.

IMPORTANT Allow braze joint to cool. Apply additional water saturated cloths to help cool brazed joint. Do not remove water saturated cloths until piping has cooled. Temperatures above 250ºF will damage valve seals.

WARNING

1.FIRE, PERSONAL INJURY, OR PROPERTY

DAMAGE will result if you do not wrap a water saturated cloth around both liquid and suction line service valve bodies and copper tube stub while brazing in the line set! The braze, when complete, must be quenched with water to absorb any residual heat.

2. Do not open service valves until refrigerant lines and indoor coil have been leak−tested and evacuated. Refer to procedures provided in this supplement.

SUCTION / VAPOR LINE

WATER SATURATED

CLOTH

LIQUID LINE

SUCTION / VAPOR LINE

SERVICE VALVE

WHEN BRAZING LINE SET TO

SERVICE VALVES, POINT FLAME

AWAY FROM SERVICE VALVE.

WATER SATURATED

CLOTH

7PREPARATION FOR NEXT STEP

After all connections have been brazed, disconnect manifold gauge set from service ports. Apply additional water saturated cloths to both services valves to cool piping. Once piping is cool, remove all water saturated cloths. Refer to the unit installation instructions for the next step in preparing the unit.

Figure 10. Brazing Procedures (continued)

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14ACX SERIES

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Contents Shipping and Packing List Table of ContentsGeneral Condensing UnitsSide View Unit Dimensions − Inches mmModel Number Identification AC X −024 − 230 −13 Typical Unit Parts ArrangementUsing Manifold Gauge SET Operating Manifold Gauge Set and Service ValvesOperating Service Valves Torque Requirements11 12 98 7 6 1DISCONNECT Power Recovering Refrigerant from Existing SystemRecovering Refrigerant 2CONNECT Manifold Gauge SETClearance on ALL Sides Minimum Clearance Above Unit New Unit PlacementMinimum Clearance Between TWO Units Positioning ConsiderationsPlacing Unit on Slab Removing and Installing LouversRoof Mounting StepMineral oils are not compatible with HFC−410A. If oil New or Replacement Line SetRefrigerant Line SET Alling InstallationVertical Runs NEW Construction Shown 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 2CONNECT Gauges and Equipment for Flushing ProcedureIndoor Expansion Valve Installation Installing Indoor Metering DeviceSensing Bulb Installation Equalizer Line InstallationLeak detector must be capable of sensing HFC refrigerant Leak Test Line Set and Indoor CoilConnect Gauge SET Evacuating Line Set and Indoor Coil24VAC Transformer ElectricalLOW Voltage Control Wiring Single Phase High Voltage / Ground WiresTypical Factory Wiring Diagram Copeland Compressor Typical Factory Wiring Diagram Interlink Compressor Servicing Units Delivered Void of Charge Connections for Testing and ChargingUnit Start−Up System RefrigerantStart Determine how refrigerant is metered Checking AIR Flow AT Indoor CoilBelow Calculating System Charge for Outdoor Unit Void of ChargeHFC−410A Subcooling TXV Charge Superheat RFC Start Measure outdoor ambient temperatureProblem exists with some component in the system System Operation MaintenanceUnit Components Homeowner Start−Up and Performance Checklist
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