Goodman Mfg R-410A manual Checking Transformer and Control Circuit, Checking Contactor Contacts

Page 24

SERVICING

S-4 CHECKING TRANSFORMER AND CONTROL CIRCUIT

A step-down transformer (208/240 volt primary to 24 volt sec- ondary) is provided with each package unit. This allows ample capacity for use with resistance heaters.

WARNING

1.Remove control panel cover or etc. to gain access to trans- former.

With power ON:

S-8 CHECKING CONTACTOR CONTACTS

DISCONNECT POWER SUPPLY BEFORE SERVICING.

SINGLE PHASE

1.Disconnect the wire leads from the terminal (T) side of the contactor.

2.With power ON, energize the contactor.

LINE VOLTAGE NOW PRESENT.

T2 T1

LINE VOLTAGE NOW PRESENT.

VOLT/OHM

METER

CC

2.

Using a voltmeter, check voltage across secondary voltage

 

side of transformer (R to C).

3.

No voltage indicates faulty transformer, bad wiring, or bad

 

splices.

4.

Check transformer primary voltage at incoming line voltage

 

connections and/or splices.

5If line voltage is present at the primary voltage side of the transformer and 24 volts is not present on the secondary side, then the transformer is inoperative. Replace.

S-7 CHECKING CONTACTOR AND/OR RELAYS

The compressor contactor and other relay holding coils are wired into the low or line voltage circuits. When the control circuit is energized the coil pulls in the normally open contacts or opens the normally closed contacts. When the coil is de- energized, springs return the contacts to their normal position.

DISCONNECT POWER SUPPLY BEFORE SERVICING.

1.Remove the leads from the holding coil.

2.Using an ohmmeter, test across the coil terminals.

If the coil does not test continuous, replace the relay or con- tactor.

L2 L1

Ohmmeter for testing holding coil

Voltmeter for testing contacts

TESTING COMPRESSOR CONTACTOR

(Single Phase)

3.Using a voltmeter, test across terminals.

A.L1 to L2 - No voltage. Check breaker or fuses on main power supply. If voltage present, proceed to step B.

B.T1 to T2 - Meter should read the same as L1 to L2 in step A. If voltage readings are not the same as step A, replace contactor.

THREE PHASE

Using a voltmeter, test across terminals:

A.L1-L2, L1-L3, and L2-L3 - If voltage is present, pro- ceed to B. If voltage is not present, check breaker or fuses on main power supply..

B.T1-T2, T1-T3, and T2-T3 - If voltage readings are not the same as in "A", replace contactor.

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Contents Service Instructions Scheduled Maintenance Product DesignSystem Operation ServicingWiring Diagrams 16B Checking Fan & Blower Motor ECM MotorsRecognize Safety SYMBOLS, Words and Labels Important InformationSafe Refrigerant Handling Product Identification Accessories Part Number Description Fits ModelsFilter Size 16 x 25 x Requires 1 filterMeasurement in inches ACCESSORIES*PH1524-60M4 MOTORIZED/MANUAL Fresh AIR Dampers Downflow ApplicationsModel Return Supply ModelEconomizer GPH13MED103 Roof Curbs PGC101/102/103 46 1/4 39 3/8 14 1/2 12 1/2 x 15 x 22 1/2Product Design Location & ClearancesCompressors Indoor Blower MotorElectrical Wiring Line Voltage WiringSystem Operation CoolingHeating Cycle Cooling CycleAirflow Adjustments for Indoor Blower Motor Defrost CycleFAN Operation Thermostat Fan Only Mode CFM Trim AdjustThermostat Wiring CFM DeliveryTypical Heat Pump System in Cooling Typical Heat Pump System in HeatingScheduled Maintenance Once a MonthOnce a Year Cooling /HEAT PUMP- Service Analysis Guide ServicingChecking Voltage Line Voltage NOW PresentChecking Wiring 3B Cooling Anticipator3C Heating Anticipator Indoor Blower MotorSingle Phase Three PhaseChecking Transformer and Control Circuit Checking Contactor ContactsChecking Loss of Charge Protector Checking High Pressure ControlChecking Capacitor 15A Resistance Check 15B Capacitance CheckAmmeter RELAY, StartChecking Motors APH15 M Series OnlyChart on Next Chart from Previous 16D Checking GE X13TM Motors Checking Compressor WindingsGPH15 M Series Only GE X13TM Motor ConnectionsTesting Compressor Windings 17A Resistance Test17B Ground Test Compressor Ground Test17C Unloader Test Procedure Unloader Test Procedure17D Operation Test Testing Crankcase Heater Testing Defrost ControlTesting Defrost Thermostat Checking Reversing Valve and SolenoidLeak Testing Nitrogen or NITROGEN-TRACED Refrigeration Repair PracticeEvacuation Brazing MaterialsCharging An inaccurately charged system will cause future prob- lemsFinal Charge Adjustment Checking Compressor EfficiencyThermostatic Expansion Valve TXV ValvesSuperheat and Subcooling Adjustment on TXV Applications OverfeedingUnderfeeding SuperheatChecking Subcooling Two Speed Application *PH1548**-*PH1560Subcooling = SAT. Liquid TEMP. Liquid Line Temp Heat Pump Heating CyclePressure vs. Temperature Chart 410A Required Liquid Line Temperature Checking Expansion Valve Operation Checking Restricted Liquid LineRefrigerant Overcharge NON-CONDENSABLESReversing Valve Replacement Suction Line Drier Clean-Up MethodChecking Temperature Rise Checking Temperature RiseChecking External Static Pressure Total External StaticWiring Diagrams OT18-60A Outdoor ThermostatRoom Thermostat Single Phase HKR** Heat KIT PH15**M4Diagrams GPH13MED Economizer for *PH15**M4
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R-410A specifications

Goodman Manufacturing, a well-respected name in the HVAC industry, has made significant advancements with their R-410A refrigerant technology. R-410A, a hydrofluorocarbon (HFC), has positioned itself as a superior alternative to the older R-22 refrigerant, which has been phased out due to its ozone-depleting properties. Goodman’s commitment to energy efficiency and environmental sustainability is well reflected in their use of R-410A in their air conditioning and heat pump systems.

One of the main features of Goodman’s R-410A systems is their exceptional energy efficiency. The R-410A refrigerant operates at a higher pressure than R-22, which allows for better heat transfer and improved cooling capacity. This results in reduced energy consumption and lower utility bills for consumers. Goodman’s air conditioning units designed for use with R-410A are often rated with high Seasonal Energy Efficiency Ratio (SEER) ratings, making them an eco-friendly choice for residential and commercial applications.

Another notable technology employed by Goodman is their commitment to reliable performance through advanced compressor designs. Goodman's scroll compressors are optimized for R-410A, ensuring quieter operation and reducing vibration levels. These compressors are known for their efficiency and longevity, making them a favorite among homeowners seeking dependable and durable climate control solutions.

Goodman's multi-stage cooling systems that utilize R-410A offer precise temperature control and enhanced comfort. By controlling the speed of the compressor, Goodman’s units can adjust output according to the heating or cooling demand, maximizing comfort while minimizing energy waste. This adaptability not only enhances indoor air quality but also contributes to a greener environment by using less energy.

Furthermore, Goodman incorporates high-tech diagnostic controls into their systems. These controls provide real-time performance data, allowing homeowners and technicians to monitor system status and troubleshoot issues more easily. By using R-410A combined with these innovative technologies, Goodman emphasizes reliability and user-friendly operation.

In conclusion, Goodman Manufacturing’s use of R-410A refrigerant reflects their dedication to efficiency, reliability, and environmental stewardship in HVAC solutions. The combination of advanced compressor technologies, high energy efficiency, and innovative controls solidifies Goodman’s reputation as a leader in the industry, offering homeowners and businesses the comfort and peace of mind they deserve.
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