Bryant 580F - Manual (Page 69)

— 69 —
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 37. 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$er+ and compressors.
Table 37 — EconoMi$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 (dif-
ferential 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$er+
changeover control to method 2 (dry bulb changeover con-
trol) or replace sensor.
Reset Method
This error will automatically reset after the value has
returned to a normal level. The alarm will have to be cleared
from the display in the Setup mode.
C. Error Code 3 — OAT Sensor Failure
Error Criteria
An OAT Sensor Failure error occurs if the sensor is shorted
or faulty, then the measured temperature will be below –40
F or above 250 F.
Required Action
— If this error occurs disable the economizer and set the
economizer to the minimum economizer position.
Reset Method
This error should automatically reset after the value has
returned to a normal level. The alarm will have to be cleared
from the display in the Setup mode or by a power reset.
D. Error Code 4 — ORH (Outdoor Relative Humidity) Sensor
Failure
Error Criteria
If the unit is configured for economizer changeover type 3 or
4, and the input signal is less than 2 mA or greater than
22 mA, then the sensor is faulty and an error will occur.
Required Action
If this error occurs, switch the EconoMi$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.
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
IAQ — Indoor Air Quality
IRH — Indoor Relative Humidity
OAT — Outdoor Air Temperature
ORH — Outdoor Relative Humidity
RAT — Return Air Temperature
SAT
— Supply Air Temperature