Bryant 580F Troubleshooting I. Economi$Er+ Troubleshooting, EconoMi$er+ Error Codes

TROUBLESHOOTING

I. ECONOMI$ER+ TROUBLESHOOTING

The EconoMi$er+ control has built-in diagnostics. The con- trol can detect and display 10 different diagnostic codes as shown in Table 40. The user can also use the integrated dis- play to check the status of all the inputs and outputs and run the manual control mode to check the operation of the EconoMi$er+ and compressors.

Table 40 — EconoMi$er+ Error Codes

NO.	DESCRIPTION	CRITERIA
1	SAT Sensor Failure	Temperature <–40 F or Greater Than 250 F
2	RAT Sensor Failure	Temperature <–40 F or Greater Than 250 F
3	OAT Sensor Failure	Temperature <–40 F or Greater Than 250 F
4	ORH Sensor Failure	Read Less Than 2 mA or Greater Than 22 mA
5	IRH Sensor Failure	Read Less Than 2 mA or Greater Than 22 mA
6	IAQ Sensor Failure	Read Less Than 2 mA or Greater Than 22 mA
7	Y2 On Y1 Off	Wiring Error
8	Micro Fails E2 Tests	Hardware/Software Check
*	Micro Fails RAM Test	Hardware/Software Check
†	Micro Fails ROM Tests	Hardware/Software Check

		LEGEND
IAQ	—	Indoor Air Quality
IRH	—	Indoor Relative Humidity
OAT	—	Outdoor Air Temperature
ORH —		Outdoor Relative Humidity
RAT	—	Return Air Temperature
SAT	—	Supply Air Temperature

*If there is a RAM failure DS1+DS3/DS2+DS4 will alternately flash. †If there is a ROM failure DS1+DS2/DS3+DS4 will alternately flash.

A.Error Code 1 — SAT Sensor Failure

Error Criteria

An SAT Sensor Failure error will occur if the sensor is shorted or faulty. If the measured temperature reads below –40 F or above 250 F an error will occur.

Required Action

If an error occurs, then the control will default to Mode 2 compressor stage control where Y1 and Y2 have direct con- trol of the compressors. Use of free cooling is disabled and the EconoMi$er+ will be set to the minimum damper posi- tion for either the occupied or unoccupied mode of operation. Replace sensor if faulty.

Reset Method

The error will automatically reset after the value has returned to a normal level. The alarm has to be cleared from the display in the Setup mode or a power reset.

B.Error Code 2 — RAT Sensor Failure

Error Criteria

The RAT Sensor failure error is only applicable the unit has been configured for EconoMi$er+ changeover methods 3 (differential dry bulb) or 5 (differential humidity). For other modes it should be ignored. If the sensor is shorted or faulty, then the measured temperature will be below –40 F or above 250 F and the error will occur.

Required Action

If this error occurs, then change the default EconoMi$er+ changeover control to method 2 (dry bulb changeover con- trol) or replace sensor.

Reset Method

This error will automatically reset after the value has returned to a normal level. The alarm will have to be cleared from the display in the Setup mode.

C.Error Code 3 — OAT Sensor Failure

Error Criteria

An OAT Sensor Failure error occurs if the sensor is shorted or faulty, then the measured temperature will be below –40 F or above 250 F.

Required Action

If this error occurs disable the economizer and set the econo- mizer to the minimum economizer position.

Reset Method

This error should automatically reset after the value has returned to a normal level. The alarm will have to be cleared from the display in the Setup mode or by a power reset.

D.Error Code 4 — ORH (Outdoor Relative Humidity) Sen- sor Failure

Error Criteria

If the unit is configured for economizer changeover type 3 or 4, and the input signal is less than 2 mA or greater than 22 mA, then the sensor is faulty and an error will occur.

Required Action

If this error occurs, switch the EconoMi$er+ to dry bulb changeover control.

Reset Method

This error should automatically reset after the value has returned to a normal level. The alarm will have to be cleared from the display in the Setup mode or by a power reset.

E.Error Code 5 — IRH (Indoor Relative Humidity) Sensor Failure

Error Criteria

This error occurs if the unit is configured for EconoMi$er+ changeover type 5 and the input signal is less than 2 mA or greater than 22 mA (faulty sensor).

Required Action

If this error occurs, switch the EconoMi$er+ to differential dry bulb changeover control.

Reset Method

This error should automatically reset after the value has returned to a normal level. The alarm will have to be cleared from the display in the Setup mode or by a power reset.

F.Error Code 6 — IAQ Sensor Failure

Error Criteria

This error occurs if the unit is configured for IAQ demand ventilation control and the input signal is less than 2 mA or greater than 22 mA (faulty sensor).

Required Action

If this error occurs, disable the IAQ control routine and default to the standard EconoMi$er+ minimum position.

Reset Method

This error should automatically reset after the value has returned to a normal level. The alarm will have to be cleared from the display in the Setup mode or by a power reset.

G.Error Code 7 — Y2 on With Y1 Off

Error Criteria

This error occurs if Y2 is turned on and Y1 is off. This indi- cates that there is a wiring error at the thermostat connec- tions. This alarm should be ignored for the first 20 seconds of operation so that it does not conflict with the special produc- tion test mode.

Required Action

Shut the unit off and check wiring.

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