Lennox International Inc Dave Lennox Signature Collection XP17 System HEAT PUMPS Troubleshooting

Page 45

Field Configuration and Testing

FAN MOTOR CONTROL (A177) OPERATION, AND

TROUBLESHOOTING

This section provides procedures for configuring,

This section provides information concerning operation

adjusting and testing various components of this unit.

and testing of the fan control.

S Fan Motor (B4) Testi Procedure

Fan Motor Control Sequence of Operation

S Fan Motor Control (A177) Configuration and Testing

During start up, the following sequence is followed:

 

S Top Grille and Fan Motor Mounting Adjustment (Fan

1. Display error conditions (see table 17), if present.

2. If no errors are detected, the LED code indicating

Clearance)

stage operation (see table 18) will display the

 

S Heat Pump Control (A175) Unit Nominal Capacity

applicable code and then a long pause.

Code configuration

3. The fan motor speed / RPM (revolutions per minute)

FAN MOTOR (B4) TEST PROCEDURE

indicator is displayed next (see table 16).

The following procedure can be used to test the fan

4. There is a short pause.

 

motor operation. A fully charged 9V battery will be

The above sequence will continue to repeat if a thermostat

required for this procedure. See figure 31 for complete

demand is present. See figure 32 for LED sequence and

test procedure.

table 18 for description of flash and pause durations.

This is a test that will verify that the motor does operate. 1. Verify main (240 volt) power if OFF to unit.

2. Remove both wires (brown and black) from the J2 terminal on the fan motor control (A177).

3. Room thermostat should be in OFF position (unit in idle mode − no heating or cooling demands)

4. Turn main power (240 volt) ON to unit.

5. Connect 9 Volt battery to fan motor plugs as noted in picture below.

6. Fan motor should run at a reduced fan speed.

7. If fan motor does not run, then replace fan motor assembly.

FAN MOTOR CONTROL

BLACK LEAD

 

 

BROWN LEAD

REMOVE BOTH LEADS FROM J2 TERMINALS

BLACK LEAD

BROWN LEAD

J2

FAN PWM OUT PARK COM

BLACK LEAD

BROWN LEAD

 

CONNECT B4 FAN MOTOR

WIRE TO 9V BATTERY

V POSITIVE TERMINAL

CONNECT B4 FAN

MOTOR BLACK COMMON

WIRE TO 9V BATTERY

NEGATIVE TERMINAL

NEGATIVE TERMINAL

POSITIVE TERMINAL

 

FULLY CHARGED 9V BATTERY

Figure 31. Fan Motor (B4) Test

Page 45

XP17 SERIES

Page 44 Page 46
Image 45
Page 44 Page 46
Contents Table of Contents GeneralHeat Pumps Side View Access View Unit Dimensions −− Inches mmModel Number Identification Base with Elongated LegsControl BOX Typical Unit Parts ArrangementUsing Manifold Gauge Set Operating Service ValvesShipping and Packing List Operating 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 SETUnit Placement Placement, Slab Mounting and Stabilizing Unit Detail a Outside Unit PlacementRemoving and Installing Panels Stabilizing Unit on Uneven SurfacesRoof Mounting Louvered Panel Removal Louvered Panel InstallationDetail C Detail D Detail aRefrigerant Line SET New or Replacement Line SetRefrigerant Line SET Alling Horizontal Runs Refrigerant Line SET From Vertical to HorizontalBrazing Connections 2CAP and Core Removal 1PIPING Panel Removal and Preparing Line SETFlow Nitrogen Wrap Service ValvesBraze Line SET 7PREPARATION for Next StepFlushing Line Set and Indoor Coil Flushing Line Set and Indoor CoilIndoor Expansion Valve Installation Installing Indoor Expansion ValveSensing Bulb Installation Equalizer Line InstallationLeak Test Leak Test Line Set and Indoor CoilS S S S Evacuating Line Set and Indoor Coil2INSTALL Thermostat Size Circuit and Install DisconnectElectrical 24VAC Transformer3A. Route Control Wires Ting Route Control Wires Ting4ROUTE High Voltage and Ground Wires Typical XP17 Wiring Heat Pump Control AGE Heat Pump Control A175 Jumpers and TerminalsHeat Pump Control A175 Jumper and Terminal Descriptions Flat metal jumper Field Control WiringFurnace Control Servicing Units Delivered Void of Charge Connections for Testing and ChargingUnit Start−Up System RefrigerantHeating Mode Indoor Airflow Check Cooling Mode Indoor Airflow CheckAdding or Removing Refrigerant Airflowindoor CoilSubcooling Charging Method Using HFC−410A Weigh In MethodAir Handler / Coil Match ups and Targeted Subcooling Values Psig Operating and Temperature PressuresDefrost System System OperationsUnit Sensors Resistor Location Sensor Temperature / Resistance RangeYES Defrost Calibration Sequence of OperationsS S Test Pin E33 FunctionsOr below Low Pressure S87 Switch OperationHigh Pressure Switch S4 Sequence of Operation Input Fault or Miswire Degrees Resistance Fahrenheit 136.3 2680 DS11 and DS14 ATUS, Fault Lockout LED Codes System Status, Fault and Lockout LED CodesResetting Fault and Lockout LED Codes DS15 and DS13 Ault Lockout LED CodesModerate Device Alert Status225ºF 107ºC Lockout Vice removed or Clears after Troubleshooting Field Configuration and TestingFAN Motor B4 Test Procedure FAN Motor Control A177 OPERATION,Fan Motor Control Stage LED Indicator Codes Fan Motor Control Error/Fault LED CodesFan Motor Control RPM, LED Code and DC Voltage Output Fan Motor Control Flash and Pause DurationsTOP Grille Adjustment TOP Grille or FAN Motor Mount Adjustment for FAN ClearanceFAN Motor Position Adjustment Demand BeginsFAN Motor Control A177 PULSE−WIDTH Modulation PWM Testing for External Power to Fan Motor Control Start StripTerminal FinishSnow Guard Top Cover MaintenanceHomeowner SunSource Home Energy System Cooling Mode XP17 Start−Up and Performance ChecklistHeating Mode START−UP Checks
Top Page Image Contents