Nordyne R-410A user manual Led, Module Wiring Troubleshooting

Page 19

TROUBLESHOOTING - CONTINUED

Miswired Module Indication

 

Recommended Troubleshooting Action

Green LED is not on, module

• Determine if both R & C module terminals are connected.

does not power up

Verify voltage is present at module’s R & C terminals.

 

 

 

 

 

Green

LED

intermittent,

Determine if R & Y terminals are wired in reverse.

module powers up only when

• Verify modules R and C terminals have a constant source.

compressor runs

 

 

 

 

 

 

 

 

 

 

 

 

Verify Y terminal is connected to 24VAC at contactor coil.

Trip LED is on, but system and

Verify voltage at contactor coil falls below 0.5VAC when

 

off.

compressor check OK

 

• Verify 24VAC is present across Y & C when thermostat

 

 

 

 

 

 

 

demand signal is present. If not, R & C are reversed wired.

 

 

 

 

TRIP LED and

ALERT LED

Verify R and C terminals are supplied with 19 - 28VAC.

fl ashing together

 

 

 

 

 

 

ALERT Flash CODE 3 displayed

• Verify Y terminal is connected to 24VAC at contactor coil.

incorrectly

(Compressor short

Verify voltage at contactor coil falls below 0.5VAC when

cycling)

 

 

 

off.

Verify the compressor run and start wires are routed

ALERT Flash Code 5, 6, or 7 through the module’s current sensing holes.

displayed incorrectly (Open

Verify the Y terminal is connected to 24VAC at contactor

Circuit, Open Start Circuit or

 

coil.

Open Run Circuit)

Verify voltage at contactor coil falls below 0.5VAC when

 

 

off.

 

 

 

ALERT Flash Code 6 (Open

 

 

Start Circuit) displayed for

Verify the compressor run and start wires are routed

Code 7 (Open Run Circuit) or

 

through the correct module sensing holes.

vice-versa

 

 

 

 

 

 

Determine if module’s Y terminal is connected.

 

Verify Y terminal is connected to 24VAC at contactor coil.

 

• Verify 24VAC is present across Y & C when thermostat

ALERT Flash Code 8 displayed

 

demand signal is present. If not, R and C are reversed

 

wired.

incorrectly (Welded Contactor)

 

Verify voltage at contactor coil falls below 0.5VAC when

 

 

 

off.

 

• Review Thermostat Demand Wiring (page 10) for Y & C

 

 

wiring.

 

Table 5. Module Wiring Troubleshooting

19

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Contents User’s Manual / Installation Instructions Page User Information About the Heat Pump Safety InformationOperating Instructions Troubleshooting System MaintenanceWarranty Information Pressures within the System Labels, Tags, and PrecautionsBrazing Operations Site Preparation Installing the Indoor UnitInstalling the Outdoor Unit General InformationElectrical Connections High-Pressure Switch Control Circuit WiringCopper Wire Size Grounding Low-Pressure SwitchVAC Power Wiring Comfort AlertTM Diagnostics ModuleFunctional Checkouts Startup and AdjustmentsIndoor Blower Diagnostic Description LED StatusControl Diagnostic Defrost Test ProcedureAdjustment of Refrigerant Charge Anti Short Cycle Timer TestCooling Charging Charts 450 425 400 375 350 325 300 275 Heating Charging Chart LED LED DiagnosticsShort Cycling Thermostat demand signal is intermittent LED Module Wiring Troubleshooting¢708868b¤
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R-410A specifications

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