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.