Lennox International Inc Dave Lennox Signature Collection XC17 Air Conditioner Leak Test

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LEAK TEST

LINE SET AND INDOOR COIL

NOTE Normally, the high pressure hose is connected to the liquid line port. How- ever, connecting it to the vapor port better protects the manifold gauge set from high pressure damage.

1CONNECT GAUGE SET

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

B With both manifold valves closed, connect the LOW 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.

B

NITROGEN

HFC−410A

HIGH

MANIFOLD GAUGE SET

OUTDOOR UNIT

VAPOR SERVICE VALVE

A

TO VAPOR

SERVICE VALVE

LIQUID LINE

SERVICE VALVE

2TEST FOR LEAKS

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

AWith 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).

BOpen 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.

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

DAdjust 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.

EAfter 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.

FAfter leak testing disconnect gauges from service ports.

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XC17 SERIES

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Contents General Table of ContentsShipping and Packing List AIR ConditionerSide View Access View Unit Dimensions − Inches mm and Parts ArrangementModel Number Identification Base with Elongated LegsControl BOX PLUMBING, Switches and Sensor ComponentsTypical Unit Parts Arrangement Using Manifold Gauge SET Operating Gauge Set and Service ValvesOperating Service Valves Torque RequirementsOperating Angle Type Service Valve To Access Service PortOperating Ball Type Service Valve Reinstall Stem CapRecovering Refrigerant from Existing System RecoveringClearance on ALL Sides Minimum Clearance Above Unit New Outdoor Unit PlacementMinimum Clearance Between TWO Units Positioning ConsiderationsRoof Mounting Elevating the UnitStabilizing Unit on Uneven Surfaces Elevated Slab Mounting using Feet Extenders Outside Unit PlacementSlab Mounting at Ground Level Stabilizing Unit on Uneven SurfacesAccess Panel Removal Removing and Installing PanelsAccess and Louvered Louvered Panel InstallationRefrigerant Line SET New or Replacement Line SetLine SET Brazing Flushing the System FlushingUncased Coil Shown Line SET and Indoor Coil 1Flushing Line SET and Indoor Coil 2 Sensing Bulb InstallationEqualizer Line Installation Installing Isolation Grommets Leak Testing the SystemLine SET and Indoor Coil Leak TestEvacuating the System Evacuating2INSTALL Thermostat Size Circuit and Install DisconnectElectrical 24VAC Transformer4ROUTE High Voltage and Ground Wires 3ROUTE Control WiresTypical XC17 Wiring Main Control AGE Main Control Jumpers and TerminalsFAN Main Control Jumpers and TerminalsFlat metal jumper Field Control WiringOn−board link Gauge SET Connections for Testing and ChargingServicing Units Delivered Void of Charge Unit Start−UpAction AirflowIndoor Coil Charge METHOD? Determine by WeighRequirements Calculating System Charge for Outdoor Unit Void of ChargeTest and Charge Method ApproachSubcooling HFC−410A Temperature Fahrenheit Psig Operating and Temperature PressuresSystem Operation Test Pins Function Ambient Sensor Temperature / Resistance Range High Discharge Sensor Temperature / Resistance Range Resetting LED Alert Codes Sensor Temperature / Resistance RangeMain Control LED Alert Codes System LED Alert CodesAlert Status Compressor LED Alert Codes Detected in RUN High Pressure Switch Operation Low Pressure Switch Operation High Discharge Temperature Sensor Operation Verifying Jumper Settings J2 MaintenanceFAN Motor Control and Start UP Verifying LED Status CodesFan Motor Board Unit LED Codes LED Codes and Sequence of OperationsControl Panel Testing for External Power to Fan Control Fan Motor Test Fan Motor Surge Protection Device FAN Motor Surge ProtectionStart UP Checks XC17 Start−Up and Performance ChecklistCooling Mode Subcooling