Lennox International Inc 506510-01 Maintenance, FAN Motor Control and Start UP

Page 42

Maintenance

WARNING

Electric shock hazard. Can cause injury or death. Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch(es). Unit may have multiple power supplies.

WARNING

Improper installation, adjustment, alteration, service or maintenance can cause personal injury, loss of life, or damage to property.

Installation and service must be performed by a licensed professional installer (or equivalent) or a service agency.

DEALER

Verifying Fan Motor Operation

FAN MOTOR CONTROL AND START UP

This motor control is used in controlling motors which employ a Pulse Width Modulation (PWM) controller. A PWM signal will run the fan motor at a revolutions per minute (RPM) that corresponds to a specific PWM signal.

VERIFYING JUMPER SETTINGS (J2)

The unit is shipped from the factory with the default motor RPM setting required for the specific model size. Use table 11 for one−stage to verify that the jumpers are set correctly for the specific size unit.

Table 11. One Stage oltage Outputs

VERIFYING LED STATUS CODES

During start up, the fan motor control LED will display any error conditions. If error conditions exist then no other codes will display. If no error conditions are present, then the stage status and and RPM indicator are displayed. Fan motor speeds are not adjustable for a single stage outdoor unit (see table 11).

VERIFYING CORRECT DC OUTPUT VOLTAGE (J2) The following three methods can be used to determine whether the fan motor is operating at the correct RPMs based on unit size.

1.Use the information provided in tables 11 to verify that all four jumper terminals are set correctly for the specific size unit.

2.Verify LED RPM indicator is displaying the correct flash sequence for the applicable size unit (see Table 11).

3.Test DC voltage output on the Motor Control’s J2 terminals (see Figure 23) while under full load and verify the voltage read to the voltage listed in Table 11 for the applicable size unit.

4.If no voltage is detected at the J2 terminals, verify there is a Y1 demand at the thermostat and 24V present at the Fan Control’s EXT PWR/R terminal during that Y1 demand (see Figure 24).

5.If 24V is present at the Fan Control EXT PWR/R terminal during a Y1 thermostat demand, and no voltage is present at the J2 terminals, then Fan Control should be replaced.

 

 

 

CFM Profile Pin Select

 

 

ECM1/Y1

 

 

 

 

(One Stage and EDA Operation)

Model

LED Code*

 

 

 

 

 

 

 

 

 

 

 

 

 

4

3

2

1

RPM

 

(J2) DC Volt

 

 

 

 

 

 

 

 

 

XP/XC17−048, −060

9

OFF

OFF

OFF

ON

675

 

21.6

 

 

 

 

 

 

 

 

 

XP/XC17−036, −042

8

OFF

OFF

ON

ON

600

 

19.2

 

 

 

 

 

 

 

 

 

XP/XC17−030

6

OFF

ON

ON

OFF

450

 

14.3

 

 

 

 

 

 

 

 

 

XP/XC17−024

5

OFF

ON

ON

ON

400

 

12.7

 

 

 

 

 

 

 

 

 

* LED Code indicates Fan Control LED flash sequence. For example, LED Code 9 indicates 9 slow flashes and pause.

Page 42

506510−01

Image 42
Contents Shipping and Packing List Table of ContentsGeneral AIR ConditionerModel Number Identification Unit Dimensions − Inches mm and Parts ArrangementSide View Access View Base with Elongated LegsPLUMBING, Switches and Sensor Components Typical Unit Parts ArrangementControl BOX Operating Service Valves Operating Gauge Set and Service ValvesUsing Manifold Gauge SET Torque RequirementsOperating Ball Type Service Valve To Access Service PortOperating Angle Type Service Valve Reinstall Stem CapRecovering Recovering Refrigerant from Existing SystemMinimum Clearance Between TWO Units New Outdoor Unit PlacementClearance on ALL Sides Minimum Clearance Above Unit Positioning ConsiderationsElevating the Unit Stabilizing Unit on Uneven SurfacesRoof Mounting Slab Mounting at Ground Level Outside Unit PlacementElevated Slab Mounting using Feet Extenders Stabilizing Unit on Uneven SurfacesAccess and Louvered Removing and Installing PanelsAccess Panel Removal Louvered Panel InstallationNew or Replacement Line Set Refrigerant Line SETLine SET Brazing Uncased Coil Shown FlushingFlushing the System Line SET and Indoor Coil 1Sensing Bulb Installation Equalizer Line InstallationFlushing Line SET and Indoor Coil 2 Leak Testing the System Installing Isolation GrommetsLeak Test Line SET and Indoor CoilEvacuating Evacuating the SystemElectrical Size Circuit and Install Disconnect2INSTALL Thermostat 24VAC Transformer3ROUTE Control Wires 4ROUTE High Voltage and Ground WiresTypical XC17 Wiring Main Control Jumpers and Terminals Main Control AGEMain Control Jumpers and Terminals FANField Control Wiring Flat metal jumperOn−board link Servicing Units Delivered Void of Charge Connections for Testing and ChargingGauge SET Unit Start−UpAirflow Indoor CoilAction Requirements WeighCharge METHOD? Determine by Calculating System Charge for Outdoor Unit Void of ChargeApproach SubcoolingTest and Charge Method Operating and Temperature Pressures HFC−410A Temperature Fahrenheit PsigSystem Operation Test Pins Function Ambient Sensor Temperature / Resistance Range High Discharge Sensor Temperature / Resistance Range Main Control LED Alert Codes Sensor Temperature / Resistance RangeResetting 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 FAN Motor Control and Start UP MaintenanceVerifying Jumper Settings J2 Verifying LED Status CodesLED Codes and Sequence of Operations Fan Motor Board Unit LED CodesControl Panel Testing for External Power to Fan Control Fan Motor Test FAN Motor Surge Protection Fan Motor Surge Protection DeviceXC17 Start−Up and Performance Checklist Cooling ModeStart UP Checks Subcooling