Goodmans ASX, GSZ, ASZ, SSX, DSZ, DSX, GSX, SSZ 16A Checking FAN and Blower Motor Windings PSC Motors

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SERVICING

S-16A CHECKING FAN AND BLOWER MOTOR WINDINGS (PSC MOTORS)

The auto reset fan motor overload is designed to protect the motor against high temperature and high amperage condi- tions by breaking the common circuit within the motor, similar to the compressor internal overload. However, heat gener- ated within the motor is faster to dissipate than the compres- sor, allow at least 45 minutes for the overload to reset, then retest.

HIGH VOLTAGE!

Disconnect ALL power before servicing or installing. Multiple power sources may be present. Failure to do so may cause property damage, personal injury or death.

1.Remove the motor leads from its respective connection points and capacitor (if applicable).

2.Check the continuity between each of the motor leads.

3.Touch one probe of the ohmmeter to the motor frame (ground) and the other probe in turn to each lead.

If the windings do not test continuous or a reading is obtained from lead to ground, replace the motor.

S-16B CHECKING FAN AND BLOWER MOTOR (ECM MOTORS)

An ECM is an Electronically Commutated Motor which offers many significant advantages over PSC motors. The ECM has near zero rotor loss, synchronous machine operation, vari- able speed, low noise, and programmable air flow. Because of the sophisticated electronics within the ECM motor, some technicians are intimated by the ECM motor; however, these fears are unfounded. GE offers two ECM motor testers, and with a VOM meter, one can easily perform basic trouble- shooting on ECM motors. An ECM motor requires power (line voltage) and a signal (24 volts) to operate. The ECM motor stator contains permanent magnet. As a result, the shaft feels "rough" when turned by hand. This is a characteristic of the motor, not an indication of defective bearings.

WARNING

Line Voltage now present.

1.Disconnect the 5-pin connector from the motor.

2.Using a volt meter, check for line voltage at terminals #4 & #5 at the power connector. If no voltage is present:

3.Check the unit for incoming power See section S-1.

4.Check the control board, See section S-40.

5.If line voltage is present, reinsert the 5-pin connector and remove the 16-pin connector.

6.Check for signal (24 volts) at the transformer.

7.Check for signal (24 volts) from the thermostat to the "G" terminal at the 16-pin connector.

8.Using an ohmmeter, check for continuity from the #1 & #3 (common pins) to the transformer neutral or "C" thermo- stat terminal. If you do not have continuity, the motor may function erratically. Trace the common circuits, locate and repair the open neutral.

9.Set the thermostat to "Fan-On". Using a voltmeter, check for 24 volts between pin # 15 (G) and common.

10.Disconnect power to compressor. Set thermostat to call for cooling. Using a voltmeter, check for 24 volts at pin # 6 and/or #14.

11.Set the thermostat to a call for heating. Using a voltmeter, check for 24 volts at pin #2 and/or #11.

1}Lines 1 and 2 will be connected for 12OVAC Power Connector

2applications only

3Gnd

4AC Line Connection

5AC Line Connection

 

OUT -

8

16

OUT +

ADJUST +/-

 

 

 

 

7

 

15

G (FAN)

 

 

Y1

6

14

Y/Y2

 

 

 

 

 

 

 

 

 

5

 

13

EM Ht/W2

 

 

COOL

 

 

 

 

 

 

 

24 Vac (R)

4

 

12

 

DELAY

 

 

 

 

3

11

HEAT

COMMON2

 

 

W/W1

 

 

BK/PWM (SPEED)

 

 

2

 

10

COMMON1

 

 

O (REV VALVE)

1

9

16-PIN ECM HARNESS CONNECTOR

If you do not read voltage and continuity as described, the problem is in the control or interface board, but not the motor. If you register voltage as described , the ECM power head is defective and must be replaced.

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Contents Service Instructions Fax us at 713 Fax us at 931 438 Recognize Safety SYMBOLS, Words and LabelsEmail us at customerservice@goodmanmfg.com Important InformationSafe Refrigerant Handling Split System Heat Pumps R410A Product IdentificationModel # Description Split System Air Conditioners R410A ASX130**1AA Single Piece Air Handlers AWUF****1AA MBR/MBE Air Handlers Product Identification 1824 3642 ASX13 AccessoriesDSX/SSX16 ASX18 ASZ13 DSZ/SSZ16 ASZ18 Expansion Valve Kits FSK01A Coil Accessories Electric Heat Kitapplications Aruf Electric Heat Kitapplications Aepf Condensing Unit Product DesignFigure a Capacity Control Cooling Cycle System OperationHeating CoolingHeating Cycle Defrost CycleCooling Cycle System Operation Description AFE18-60A Control BoardCOOLING/HP Analysis Chart Troubleshooting Chart61B ServicingChecking Voltage Checking WiringChecking THERMOSTAT, WIRING, and Anticipator 3A Thermostat and Wiring3C Heating Anticipator 3B Cooling AnticipatorChecking Cycle Protector Checking Time Delay RelayTesting Coil Circuit Checking Transformer Control CircuitChecking Contactor Contacts Testing Compressor ContactorSingle Phase Checking Contactor AND/OR RelaysTesting FAN Relay Copeland Comfort Alert DiagnosticsDiagnostics Table Checking Capacitor Checking Loss of Charge ProtectorChecking High Pressure Control Checking LOW Pressure Control15B Capacitance Check 15A Resistance CheckRELAY, Start 16B Checking FAN and Blower Motor ECM Motors 16A Checking FAN and Blower Motor Windings PSC MotorsChart on Next Chart from Previous 16C Checking ECM Motor Windings 16D ECM CFM Adjustments MBE / AepfCFM 16F Checking GE X13TM Motors 16E Blower Performance DataGE X13TM Motor Connections 17B Ground Test Testing Compressor WindingsChecking Compressor 17A Resistance TestCompressor Ground Test 17C Unloader Test ProcedureUnloader Test Procedure 17D Operation TestChecking Reversing Valve and Solenoid Testing Crankcase Heater Optional ItemTesting Defrost Control Testing Defrost ThermostatSequence of Operation 40 MBR/AR*F Electronic Blower Time Delay RelayChecking Heater Limit Controls Checking Heater ElementsHeating Operation MBR/AR*F with Single Stage Heat PumpsDefrost Operation 41 MBE/AEPF with GSX, SSX, ASX, DSXMBE/AEPF with Single Stage GSX, ASX and SSX Condensers 41A MBE/AEPF with Single Stage GSZ, SSZ, & ASZ Heat Pumps MBE/AEPF with TWO Stage ASX & DSX Condensers Sequence of OperationMBE/AEPF with TWO Stage ASZ & DSZ Heat Pump Units Electric Heater Optional Item 61B Checking Heater Fuse Link Optional Electric Heaters 61A Checking Heater Limit ControlsFormulas Brazing Materials Leak Testing Nitrogen or NITROGEN-TRACEDRefrigeration Repair Practice EvacuationEvacuation ChargingChecking Compressor Efficiency Final Charge AdjustmentTXV Valves 105B Thermostatic Expansion ValvePressure vs. Temperature Chart 410A Required Liquid Line Temperature Checking Subcooling OverfeedingUnderfeeding SuperheatSubcooling Formula = Sat. Liquid Temp. Liquid Line 109A TWO Speed ApplicationChecking Expansion Valve Operation Fixed Orifice Restrictor DevicesCompressor Burnout Checking Restricted Liquid LineOvercharge of Refrigerant NON-CONDENSABLESTube Sizing Accessories for lines greater than 80 feetRefrigerant Piping Long Line SET Application R-410AInstallation Requirements Initial System Charging AIR Handler External StaticTotal External Static Coil Static Pressure DropStatic Pressure Drop ALL Fuel System AFE18-60A Control Board Accessories Wiring Diagrams10kw and Below, One Stage Electric Heat OT/EHR18-60 #2 GRD PLM PLF XFMR-R XFMR-C After Installing Optional Heat KIT, Mark AN X Provided Above HKR Heat Kit GRD PLM PLF