Honeywell AC-220-7, AC-140-7 manual Section Troubleshooting, Troubleshooting Procedures

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SECTION 4

 

TROUBLESHOOTING

 

4.1 TROUBLESHOOTING PROCEDURES

 

 

 

 

 

 

PROBLEM

POSSIBLE CAUSES

SOLUTIONS

 

1. Aftercooler fan motor

Controller not set properly

Check the controller settings as outlined in Section 2.7. The

 

continues to operate,

 

controller may be set in the heat mode or the set points set too

 

system temperature

 

low. Set the controller to the recommended settings.

 

below 35OF.

 

 

 

 

Control relay faulty

Check the control relay. Replace if faulty.

 

 

 

 

 

2. Aftercooler fan motor

No power to the control box

Check main electrical power source.

 

not operating, system

 

 

 

temperature above

No power to the controller

Check the transformer. Make sure that the jumpers on the

 

45OF.

 

 

transformer are properly installed. Reference Section 2.5.

 

 

 

 

 

 

Check the fuses on the transformer.

 

 

Controller not set properly

Check the controller settings as outlined in Section 2.7. The

 

 

 

controller may be set in the heat mode or the set points set too

 

 

 

high. Set the controller to the recommended settings.

 

 

 

 

 

 

Controller failure

Check the controller settings. If the controller is properly set, check

 

 

 

the main power source.

 

 

 

Check the controller display for error codes. Section 4.2 outlines

 

 

 

what the error codes indicate and the necessary steps.

 

 

 

 

 

 

Sensor failure

If the sensor is faulty a "--" will be displayed for the temperature on the

 

 

 

controller display. Refer to Section 4.2 for further details. If the

 

 

 

sensor is faulty, it must be replaced.

 

 

 

 

 

 

Control relay faulty

Check the control power at the relay coil. Check the relay for proper

 

 

 

operation. Replace if faulty.

 

 

 

 

4.2 CONTROLLER ERROR CODES

The controller display panel is used to display error codes in the event of problems with the controller. The four error codes are listed below.

---SENSOR FAILURE

The "--" displayed for the temperature indicates that there is a problem with the sensor. The sensor is open or shorted. All relays will be de-energized in the event of a sensor failure. If the sensor is damaged, it must be replaced.

EE-EEPROM FAILURE

The "EE" error code indicates that there is a problem with EEPROM. The values read back from the EEPROM are not the same as what was written into the EEPROM. This error cannot be field repaired. The controller must be replaced.

-60°F or 270°F (-51°C or 132°C) Blinking - TEMPERATURE OUT OF RANGE

The temperature display blinks when the sensed temperature is outside of the display range, below -60°F (-51°C) or above 270°F (132°C). The displayed value remains at the display limit and the controller continues to function unless an open or shorted condition is detected.

BLINKING RELAY STATUS

This occurs when the Relay Minimum Off Time is active. The (ñ ) blinks while the relay's minimum off time is active.

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Contents FP-4 Freeze Protection KIT Section IntroductionInstallation SectionInstalling the Conduit Section Installation Control BOX Component Layout and Wiring DiagramSetting the Controller OperationSection Troubleshooting Troubleshooting ProceduresSection Replacement Parts Replacement PartsSection Warranty PER VAN AIR Terms and Conditions of SaleProduct Description Temperature Sensorsa Controller DimensionsAccessories Wiring Before InstallationInstallation and Setup MountingTemperature Sensor Wire Type and Size Wiring Connections AccessTemperature Sensor Wiring Multiple Parallel SensorsController Wiring Controller Wiring MethodDescription of Wiring Terminal Connections Terminal Label Wiring Applications ExamplesController Wiring Details Connection Terminal Label Description SensorsWiring for four-stage control 24 Vac input 24 Vac load Wiring for ML7984 valve actuator Wiring for three Series 90 Modutrol Motors Checkout Power LossTemperature Sensor Calibration Foota MΩ/ft Rating 200 ft 500 ft 000 ftUsing the LCD Panel Interface Interface OverviewHome Screen Setup Menu Accessing the MenusUsing the Menus Programming, Scheduling, and Summary MenusProgramming Heating Mode Setpoint and DifferentialCooling Mode Setpoint and Differential Setpoint and DifferentialEntering Program Mode Programming the T775A/B/M ControllerProgram Menu for Outputs Differential or Throttling Range SensorHEAT/COOL Exiting Program Mode SetbackProgram Next Output Mod or Relay Entering Setup Mode Setup Advanced OptionsSetup Procedure Setting up the SensorsCalibrate the sensor Sensor aUnits F or C Label the sensor inputCalibrate Exit Sensor a SetupSensor B LabelHI Limit or LOW Limit Sensor B only Limit Sensor B onlySetting up the Outputs Setting up the Modulating OutputsThrottling Range Sensor B only Type of output signal MIN OUT %Integral Schedule ExitOptions USE SchedMIN OFF minimum off time for all relays DI Options digital input optionsShow RT show run time hours Exit Options Setup Setting up the RelaysType standard or floating Floating Relay Menu Reset RT run time hours Derivative modulating/floating relay onlyExit Setup Mode Setup Outputs Relay ExitEntering Schedule Mode SchedulingCreating a Schedule SET Time SET DateDaylight daylight saving time Setting Individual Schedules Mon-Fri Schedule Defaults1. E1 Setpt setpoint for event 2. E1 Time time for event Exiting Scheduling ModeExit exit from selected time period settings 3. E2 Setpoint setpoint for eventError Message TroubleshootingErrors and Diagnostics Diagnostic MessagesImmunity Compliance Safety ComplianceEmissions Compliance FCC Compliance StatementDOC T775A/B/M Series 2000 Controller

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