Lennox International Inc 4HP18LT manual Approach Values for TXV Systems

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° Liquid Line Temperature °F

_

° Outdoor Ambient Temperature °F

=° Approach Temperature °F

6.Compare the approach value with those shown in Table

9.If the values do not agree with those provided in Table 8, add refrigerant to lower the approach temperature or recover refrigerant from the system to increase the approach temperature.

Check Charge Using Normal Operating Pressures Use Table 7 to perform maintenance checks. Table 7 is not a procedure for charging the system. Minor variations in these pressures may be due to differences in installations. Significant deviations could mean that the system is not properly charged or that a problem exists with some component in the system.

Approach Values for TXV Systems

Table 7

506470-01

Issue 1007

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Contents Save these instructions for future reference Lennox International Inc. CompanyInstallation Installation ClearancesGeneral Torque TableElectrical Wiring Slab MountingSlab Mounting Roof MountingInstalling Refrigerant Line Refrigerant PipingPlacement Outside Unit Placement & InstallationLine Set Isolation Refrigerant Line Set DiametersRefrigerant Line Sets Installing Horizontal Runs Refrigerant Line Sets Transition from Vertical to Horizontal Flushing Procedure Required EuipmentRefrigerant Metering Device Expansion Valve SystemsTo Access the Schrader Port To Close Liquid or Suction Line Service ValveUsing an Electronic Leak Detector EvacuationIssue START-UP Refrigerant Charge AdjustmentRefrigerant Charging Issue R410A Temperature/Pressure Chart Approach Values for TXV Systems Issue Operation Defrost Control Timing Pins Compressor DelayTime Delay Pressure Switch CircuitInterpreting the Diagnostic LEDs System Diagnostic ModuleLED Description 24VAC Power Wiring Thermostat Demand Wiring Miswired Module CodesMaintenance Temperature Setting Levers Inspect and clean outdoor coilHomeowner Information Fan Switch System SwitchTemperature Indicator Indicating LightStart-Up and Performance Checklist Wire Diagram Issue