Goodmans ASZ, GSZ, SSX, ASX, DSZ, DSX, GSX Checking Compressor, 17A Resistance Test, 17B Ground Test

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SERVICING

S-17 CHECKING COMPRESSOR

WARNING

Hermetic compressor electrical terminal venting can be dangerous. When insulating material which supports a hermetic compressor or electrical terminal suddenly disintegrates due to physical abuse or as a result of an electrical short between the terminal and the compressor housing, the terminal may be expelled, venting the vapor and liquid contents of the compressor housing and system.

If the compressor terminal PROTECTIVE COVER and gas- ket (if required) are not properly in place and secured, there is a remote possibility if a terminal vents, that the vaporous and liquid discharge can be ignited, spouting flames several feet, causing potentially severe or fatal injury to anyone in its path.

This discharge can be ignited external to the compressor if the terminal cover is not properly in place and if the discharge impinges on a sufficient heat source.

Ignition of the discharge can also occur at the venting terminal or inside the compressor, if there is sufficient contaminant air present in the system and an electrical arc occurs as the terminal vents.

Ignition cannot occur at the venting terminal without the presence of contaminant air, and cannot occur externally from the venting terminal without the presence of an external ignition source.

Therefore, proper evacuation of a hermetic system is essential at the time of manufacture and during servicing.

To reduce the possibility of external ignition, all open flame, electrical power, and other heat sources should be extin- guished or turned off prior to servicing a system.

If the following test indicates shorted, grounded or open windings, see procedures S-19 for the next steps to be taken.

S-17A RESISTANCE TEST

Each compressor is equipped with an internal overload.

The line break internal overload senses both motor amperage and winding temperature. High motor temperature or amper- age heats the disc causing it to open, breaking the common circuit within the compressor on single phase units.

Heat generated within the compressor shell, usually due to recycling of the motor, high amperage or insufficient gas to cool the motor, is slow to dissipate. Allow at least three to four hours for it to cool and reset, then retest.

Fuse, circuit breaker, ground fault protective device, etc. has not tripped -

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 leads from the compressor terminals.

See warnings S-17 before removing compressor terminal cover.

2.Using an ohmmeter, test continuity between terminals S-R, C-R, and C-S, on single phase units or terminals T2, T2 and T3, on 3 phase units.

C

OHMMETER

S

R

COMP

TESTING COMPRESSOR WINDINGS

If either winding does not test continuous, replace the compressor.

NOTE: If an open compressor is indicated, allow ample time for the internal overload to reset before replacing compres- sor.

S-17B GROUND TEST

If fuse, circuit breaker, ground fault protective device, etc., has tripped, this is a strong indication that an electrical problem exists and must be found and corrected. The circuit protective device rating must be checked, and its maximum rating should coincide with that marked on the equipment nameplate.

With the terminal protective cover in place, it is acceptable to replace the fuse or reset the circuit breaker ONE TIME ONLY to see if it was just a nuisance opening. If it opens again, DO NOT continue to reset.

Disconnect all power to unit, making sure that all power legs are open.

1.DO NOT remove protective terminal cover. Disconnect the three leads going to the compressor terminals at the nearest point to the compressor.

2.Identify the leads and using a Megger, Hi-Potential Ground Tester, or other suitable instrument which puts out a voltage between 300 and 1500 volts, check for a ground separately between each of the three leads and ground (such as an unpainted tube on the compressor).

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Contents Service Instructions Email us at customerservice@goodmanmfg.com Recognize Safety SYMBOLS, Words and LabelsImportant Information Fax us at 713 Fax us at 931 438Safe 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 Heating System OperationCooling Cooling CycleHeating Cycle Defrost CycleCooling Cycle System Operation Description AFE18-60A Control BoardCOOLING/HP Analysis Chart Troubleshooting Chart61B ServicingChecking THERMOSTAT, WIRING, and Anticipator Checking Wiring3A Thermostat and Wiring Checking Voltage3C Heating Anticipator 3B Cooling AnticipatorTesting Coil Circuit Checking Time Delay RelayChecking Transformer Control Circuit Checking Cycle ProtectorSingle Phase Testing Compressor ContactorChecking Contactor AND/OR Relays Checking Contactor ContactsTesting FAN Relay Copeland Comfort Alert DiagnosticsDiagnostics Table Checking High Pressure Control Checking Loss of Charge ProtectorChecking LOW Pressure Control Checking Capacitor15B 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 Checking Compressor Testing Compressor Windings17A Resistance Test 17B Ground TestUnloader Test Procedure 17C Unloader Test Procedure17D Operation Test Compressor Ground TestTesting Defrost Control Testing Crankcase Heater Optional ItemTesting Defrost Thermostat Checking Reversing Valve and SolenoidChecking Heater Limit Controls 40 MBR/AR*F Electronic Blower Time Delay RelayChecking Heater Elements Sequence of OperationHeating 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 Refrigeration Repair Practice Leak Testing Nitrogen or NITROGEN-TRACEDEvacuation Brazing MaterialsEvacuation ChargingChecking Compressor Efficiency Final Charge AdjustmentTXV Valves 105B Thermostatic Expansion ValvePressure vs. Temperature Chart 410A Required Liquid Line Temperature Underfeeding OverfeedingSuperheat Checking SubcoolingChecking Expansion Valve Operation 109A TWO Speed ApplicationFixed Orifice Restrictor Devices Subcooling Formula = Sat. Liquid Temp. Liquid LineOvercharge of Refrigerant Checking Restricted Liquid LineNON-CONDENSABLES Compressor BurnoutRefrigerant Piping Accessories for lines greater than 80 feetLong Line SET Application R-410A Tube SizingInstallation 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
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