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Frequently Asked Questions & Faults
i1. “No Link” Shown on the Carel Display The remote display is not communicating with the Carel controller in the AMU control panel. 1. See steps b16 and c6
i2. “VFDs Power Up And Display Numbers, But No Power To Anything Else”
1. Is the emergency stop button at the remote panel pulled out? 2. Is the fire suppression equipment (by others) connected properly? a. If fire suppression is not connected, a jumper needs to be installed on the terminal block. See the schematic for the unit to determine which terminal numbers to jumper. ( c3. – c4. )
i3. “Blower Start Fault” Shown on the Carel Display The Carel controller told the fans to run, but the fans did not prove running.
1. Visually inspect the AMU inlet/discharge damper to ensure its opening and that the limit switch is proving its open ( c11. – c12. ) 2. If the booth has more than one exhaust fan, there will be overloads on the output side of the exhaust VFD. Check the overloads for a faulted condition ( c20. – c21. ) 3. Check the VFDs for fault codes. A common fault is E.THN which means the motor was drawing more amps than the value set in P9. 4. Reset the VFDs by turning off the power for 3 minutes and then re-energizing the panel. i4. “Low Airflow” Shown on the Carel Display The Carel controller proved that the fans are running but did not see enough air pressure across the burner. 1. Visually inspect the inlet/discharge damper – the Belemo actuator could be loose on the shaft of the damper which would allow the Belemo to “prove” open, but not actually open the damper. ( c11. – c12. ) 2. Ensure the caps are on the red and green tubes (tees) in the AMU control panel. If a manometer is not connected to the tubes, the caps must be securely attached to the tees to prevent the tees from leaking. 3. If caps are in place, remove caps and connect a manometer to the tubes. Using the manometer, measure the air pressure between the red and green tubes at the PS-1 pressure switch in the AMU control panel. ( d4. ) 4. Check the AMU filters condition (clogged filters reduce air flow) The exhaust fan overloads tripped due to over amperage 1. Press reset button on each exhaust fan overload 2. Check amps when the exhaust fan is running at full speed 3. Compare measured amps to motor name plate (measured amps should be equal to or lower than name plate marking) 4. Ensure overload setting matches motor name plate or is set to 125% of motor FLA rating. i5. “Flame Safeguard” Shown on the Carel Display The Carel controller told the burner to ignite, and the Fire Eye attempted to ignite the flame by energizing the igniter and pilot gas valve but was not able to prove the flame came on (“flame fault”). 1. Check the Fire Eye alarm codes for details (operation manual page 31) 2. Turn on the burner and watch through the site glass, look for spark, then pilot light, then main flame.
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