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55NetworkAIR FM DX 60 Hz Operation, Maintenance, and Troubleshooting
Env Temperature Low • Verify that no supply air is fed directly back into the return air.
• Ensure that the alarm delay is not set too low. The delay should be long
enough to allow the room temperature to stabilize after start-up.
• Verify that the temperature alarm threshold for the environmental (return or
remote) sensors is 7 - 10°F below the reheat setpoint.
• Verify that the Module is configured and equipped for the reheat mode.
• Ensure that the reheat mode is enabled and working properly.
• Ensure that the reheat mode is not disabled because of an active user-defined
input mapped to nonessential lockout.
Exp Module # 1
Communication Lost
• Verify the System CAN connections in the user interface box are connected
correctly and properly terminated.
• Check the CAN addresses assigned with the DIP switches on the controller
board on the electrical panel. N
OTE: The controller must be restarted to
recognize an address change.
Exp Module # 2
Communication Lost
• Verify the System CAN connections in the user interface box are connected
correctly and properly terminated.
• Check the CAN addresses assigned with the DIP switches on the controller
board on the electrical panel.
Fire Detected • Follow the appropriate facility emergency protocol. N
OTE: The purpose of
the fire sensor is to warn you of possible equipment damage. It is NOT
intended to provide a fire alarm system to protect the facility and the lives of
its occupants.
• Confirm that the wiring connections are secured to the wiring harness.
• Verify the fire detector (firestat) is set to 125°F.
• Reset the firestat by pressing the reset button on the firestat.
• Replace the fire detector (firestat).
Fluid Coil No Coolant Flow • Verify chilled water supply.
• Check the operation of the flow switch.
• Check the electrical connection to the flow switch.
• Verify that the Economizer automatic coolant isolation valve is open (if
equipped).
• Verify that the valve type setting is correct in the System Configuration
(Path: Main > Setup > System # > System Config > Valve Types).
Fluid Coil Actuator Fail • Verify the proper connections between the actuator and the controller board.
• Confirm that the control voltage and signal voltage reach the actuator.
• Ensure that the proper Module Configuration is defined for this Module,
especially that the coil Configuration and the MultiCool/Economizer actuator
type are correct.
• Replace the fluid coil actuator.
Fluid Coil Coolant Temp High • For Economizer Modules, check the operation of the outdoor heat exchanger.
• For MultiCool Modules, check the chilled water supply temperature.
• Verify that the fluid coil coolant temperature high threshold is not set below
the normal temperature of your chilled water supply.
Fluid Coil Coolant Temp Low • For Economizer Modules, check the operation of the outdoor heat exchanger.
• For MultiCool Modules, check the chilled water supply temperature.
• Verify that
the low threshold for the fluid coil coolant temperature is not
set above the normal temperature of your chilled water supply.
Displayed Alarm Message Action Required