Goodman Mfg RT6100004R13 manual Checking Transformer Control Circuit, Checking Cycle Protector

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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 indoor unit. This allows ample capacity for use with resistance heaters. The outdoor sec- tions do not contain a transformer.

WARNING

Disconnect ALL power before servicing.

1.Remove control panel cover, or etc., to gain access to transformer.

With power ON:

WARNING

Line Voltage now present.

2.Using a voltmeter, check voltage across secondary volt- age 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 volt- age connections and/or splices.

5If line voltage available at primary voltage side of trans- former and wiring and splices good, transformer is inop- erative. Replace.

S-5 CHECKING CYCLE PROTECTOR

Some models feature a solid state, delay-on make after break time delay relay installed in the low voltage circuit. This control is used to prevent short cycling of the compressor under certain operating conditions.

The component is normally closed (R1 to Y1). A power interruption will break circuit (R1 to Y1) for approximately three minutes before resetting.

1.Remove wire from Y1 terminal.

2.Wait for approximately four (4) minutes if machine was running.

With power ON:

WARNING

Line Voltage now present.

1.Apply 24 VAC to terminals R1 and R2.

2.Should read 24 VAC at terminals Y1 and Y2.

3.Remove 24 VAC at terminals R1 and R2.

4.Should read 0 VAC at Y1 and Y2.

5.Reapply 24 VAC to R1 and R2 - within approximately three (3) to four (4) minutes should read 24 VAC at Y1 and Y2.

If not as above - replace relay.

S-6 CHECKING TIME DELAY RELAY

Time delay relays are used in some of the blower cabinets to improve efficiency by delaying the blower off time. Time delays are also used in electric heaters to sequence in multiple electric heaters.

WARNING

Disconnect ALL power before servicing.

1.Tag and disconnect all wires from male spade connec- tions of relay.

2.Using an ohmmeter, measure the resistance across terminals H1 and H2. Should read approximately 150 ohms.

3.Using an ohmmeter, check for continuity across termi- nals 3 and 1, and 4 and 5.

4.Apply 24 volts to terminals H1 and H2. Check for continuity across other terminals - should test continu- ous. If not as above - replace.

NOTE: The time delay for the contacts to make will be approximately 20 to 50 seconds and to open after the coil is de-energized is approximately 40 to 90 seconds.

OHMMETER

TESTING COIL CIRCUIT

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Contents Service Instructions Table of Contents Important InformationSafe Refrigerant Handling Product Identification Split System Air Conditioners R-22Split System Air Conditioners R-22 Split System Heat Pumps R-22 Product Identification Single Piece Air Handlers Single Piece Air Handlers MBR/MBE Air Handlers 036 036 120 3642 1824 Accessories ASC01CPKF24 CPKF36 CPKF42 CPKF48 CPKF60 CPKF61 Expansion Valve Kits FSK01A Coil Accessories Product Design Condensing UnitProduct Design System Operation HeatingCooling Cycle System Operation Indoor Coil Outdoor Thermostatic Expansion Valve AFE18-60A Control Board DescriptionTroubleshooting Chart COOLING/HP Analysis ChartServicing Table of Contents Checking Voltage Checking Wiring Checking THERMOSTAT, WIRING, and Anticipator3A Thermostat and Wiring Servicing3B Cooling Anticipator 3C Heating AnticipatorChecking Time Delay Relay Testing Coil CircuitChecking Transformer Control Circuit Checking Cycle ProtectorTesting Compressor Contactor Testing FAN RelayChecking Contactor AND/OR Relays Checking Contactor ContactsCopeland Comfort Alert Diagnostics Applies to ASC13 & ASH13Diagnostics Table Red TripHard Start KIT Wiring Testing Capacitor ResistanceChecking Loss of Charge Protector Checking CapacitorTesting Capacitance 15B Capacitance Check16A Checking FAN and Blower Motor Windings PSC Motors 16B Checking FAN and Blower Motor ECM Motors16D ECM CFM Adjustments 16C Checking ECM Motor WindingsChart on Next Chart from Previous Itc h 16E Checking GE X13TM Motors Checking Compressor17A Resistance Test GE X13TM Motor ConnectionsTesting Compressor Windings 17B Ground Test17D Operation Test Compressor Ground TestTesting Crankcase Heater Optional Item Testing Defrost ControlTesting Defrost Thermostat Checking Reversing Valve and Solenoid40 AR*F & MBR Electronic Blowers Time Delay Relay Sequence of OperationAR*F & MBR With Single Stage Condensers AR*F & MBR With Single Stage Heat PumpsAEP* & MBE Electronic Blower Time Delay Relay 41 AEP* & MBE with Single Stage CON Densers41A AEP* & MBE with Single Stage Heat Pumps Electric Heater Optional Item Temperature Rise F @ CFM 61A Checking Heater Limit ControlsLeak Testing Nitrogen or NITROGEN-TRACED 61B Checking Heater Fuse Link Optional Electric HeatersChecking Heater Elements Refrigeration Repair PracticeEvacuation EvacuationCharging Checking Compressor Efficiency An inaccurately charged system will cause future prob- lems105B Thermostatic Expansion Valve Overfeeding UnderfeedingSuperheat Thermostatic Expansion ValvesChecking Subcooling Checking Expansion Valve OperationOvercharge of Refrigerant Checking Restricted Liquid LineNON-CONDENSABLES Compressor BurnoutSuction Line Drier Clean-Up Method Refrigerant PipingInstallation Requirements Reversing Valve Replacement System ChargingAIR Handler External Static Coil Static Pressure DropTotal External Static Static Pressure DropALL Fuel System Control Board AFE18-60A Accessories Wiring DiagramsALL Fuel System AFE18-60A Control Board 10kw 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 Accessories Wiring Diagrams
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