Goodmans DSX, GSZ, ASZ, SSX, ASX, DSZ, GSX, SSZ manual Charging, Evacuation

Page 61

SERVICING

IMPORTANT NOTE: Because of the potential damage to compressors, do not allow suction pressure at service valve to drop below 20 PSIG when pumping unit system down for repair. Outdoor section, depending on line set length and amount of charge in system, may not be able to hold the entire system charge.

This is the most important part of the entire service proce- dure. The life and efficiency of the equipment is dependent upon the thoroughness exercised by the serviceman when evacuating air (non-condensables) and moisture from the system.

Air in a system causes high condensing temperature and pressure, resulting in increased power input and reduced performance.

Moisture chemically reacts with the refrigerant oil to form corrosive acids. These acids attack motor windings and parts, causing breakdown.

The equipment required to thoroughly evacuate the system is a high vacuum pump, capable of producing a vacuum equivalent to 25 microns absolute and a thermocouple vacuum gauge to give a true reading of the vacuum in the system

LOW SIDE

GAUGE

AND VALVE

800 PSI RATED HOSES

TO

UNIT SERVICE

VALVE PORTS

HIGH SIDE

GAUGE

AND VALVE

CHARGING

CYLINDER

AND SCALE

VACUUM PUMP

ADAPTER

VACUUM PUMP

NOTE: Never use the system compressor as a vacuum pump or run when under a high vacuum. Motor damage could occur.

WARNING

Do not front seat the service valve(s) with the compressor open, with the suction line of the comprssor closed or severely restricted.

1.Connect the vacuum pump, vacuum tight manifold set with high vacuum hoses, thermocouple vacuum gauge and charging cylinder as shown.

2.Start the vacuum pump and open the shut off valve to the high vacuum gauge manifold only. After the compound gauge (low side) has dropped to approximately 29 inches of vacuum, open the valve to the vacuum thermocouple gauge. See that the vacuum pump will blank-off to a maximum of 25 microns. A high vacuum pump can only produce a good vacuum if its oil is non-contaminated.

EVACUATION

3.If the vacuum pump is working properly, close the valve to the vacuum thermocouple gauge and open the high and low side valves to the high vacuum manifold set. With the valve on the charging cylinder closed, open the manifold valve to the cylinder.

4.Evacuate the system to at least 29 inches gauge before opening valve to thermocouple vacuum gauge.

5.Continue to evacuate to a maximum of 250 microns. Close valve to vacuum pump and watch rate of rise. If vacuum does not rise above 1500 microns in three to five minutes, system can be considered properly evacuated.

6.If thermocouple vacuum gauge continues to rise and levels off at about 5000 microns, moisture and non- condensables are still present. If gauge continues to rise a leak is present. Repair and re-evacuate.

7.Close valve to thermocouple vacuum gauge and vacuum pump. Shut off pump and prepare to charge.

S-103 CHARGING

WARNING

REFRIGERANT UNDER PRESSURE!

*Do not overcharge system with refrigerant.

*Do not operate unit in a vacuum or at negative pressure.

Failure to follow proper procedures may cause property damage, personal injury or death.

61

Page 60 Page 62
Image 61
Page 60 Page 62
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
Top Page Image Contents