Greenheck Fan 473501 Troubleshooting - Controller Alarms, DDC Controller, FX05 Furnace Controller

Troubleshooting - Controller Alarms

The first step in troubleshooting the unit is to check the on-board alarm indicators. Several of the electronic controls in the unit monitor the system for faults and will go into alarm, shutting down the unit or a single function within the unit.

DDC Controller

Check the screen on the DDC for an alarm condition. If the DDC is

in an alarm condition, a message will show on the DDC screen.

The DDC is located in the main control center. If the DDC is in alarm condition, the alarm button will blink red. Press the alarm button to see the specific condition or to reset the DDC. Refer to the DDC Installation Operations and Maintenance manual for detailed information on fault codes and see the unit-specific wiring diagram.

Phase Monitor

The phase monitor has two LED indicator lights, one red and one green. Green indicates proper operational status, red indicates the unit has detected a fault and is in alarm condition.

Variable Frequency Drive (VFD)

Variable frequency drives have a display screen that will show an alarm condition. If a fault such as a voltage spike occurs, the VFD will go into alarm and will not reset until a hard restart is performed. See the unit-specific manufacturer’s manual supplied with the unit. VFDs are located in the main control center.

FX05 Furnace Controller

Present only if an indirect gas-fired furnace option is present.

The FX05 furnace controller will display an alarm condition if present. The controller will be found in the furnace control cneter. See the

furnace installation, operation and maintenance manual and the controller manufacturer’s unit-specific manul for further information.

28Model ERCH-HP Energy Recovery Unit