Bryant DuraPac Series 580f User Manual download pdf (Page 53)

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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

LEGEND

*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. Erro r C ode 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. ErrorCode7—Y2onWith 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.

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 Y2OnY1 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

IAQ — Indoor Air Quality

IRH — Indoor Relative Humidity

OAT — Outdoor Air Temperature

ORH — Outdoor Relative Humidity

RAT — Return Air Temperature

SAT — Supply Air Temperature

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Bryant DuraPac Series 580f User Manual Page 53

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