Daikin AGZ 025D Operating & Maintenance Manual page 69

Compressor Communications
The communication module, installed in the 20 to 40 ton compressor electrical box, provides advanced
diagnostics, protection, and communications that enhance compressor performance and reliability.
Features include motor temperature protection, scroll temperature protection, missing phase
protection, reverse phase protection, low control circuit voltage protection, short cycling detection and
alert, modbus communication to system controller, operational and fault history storage, and LED
status display.
Green/Red LEDs
OPERATION
Warnings and Alerts
A solid green LED indicates the module is powered and operation is normal.
A solid red LED indicates an internal problem with the module.
A flashing green LED communicates Warning codes. Warning codes do not result in a trip or lockout
condition.
A flashing red LED communicates Alert codes. Alert codes will result in a trip condition and
possibly a lockout condition
Warning Codes (Flashing Green LED )
Code 1 – Loss of Communication: The module will flash the green Warning LED one time indicating
the module has not communicated with the master controller for longer than 5 minutes.
Code 2 – Reserved For Future Use
Code 3 – Short Cycling: The module will flash the green Warning LED three times indicating the
compressor has short cycled more than 48 times in 24 hours.
Code 4 – Open/Shorted Scroll Thermistor: The module will flash the green Warning LED four times
indicating an open/shorted
Alert/Lockout Codes (Flashing Red LED)
Code 1 – Motor High Temperature: The module will flash the red Alert LED one time indicating the
motor is onerheating . A code 1 Alert will open the M2-M1 contacts. The Alert will reset after 30
minutes. Five consecutive Code 1 Alerts will lockout the compressor. Once the module has locked out
the compressor, a power cycle or Modbus reset command will be required for the lockout to be
cleared.
Code 2 – Open/Shorted Motor Thermistor The module will flash the red Alert LED two times
indicating the motor PTC thermistor circuit has an open/shorted thermistor chain (see Table 2). A
Code 2 Alert will open the M2-M1 contacts. The Alert will reset after 30 minutes and the M2-M1
contacts will close if the resistance of the motor PTC circuit is back in the normal range. The module
OMM 1166-1 AGZ 025D through 190D 69