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If no spark: inspect the igniter and cable. Check the voltage leaving the output of the Fire Eye (terminal 4) If spark but no pilot: check gas pressure. Ensure gas is leaving the pilot solenoid into the burner. NOTE: too much gas pressure (usually more than 2psi or 56”w.c.) can cause the pilot regulator to seize up and not allow gas through the pilot solenoid into the burner. If spark, pilot, but no main flame: inspect flame rod and cable. Test voltage on Fire Eye DC test terminals – should be between 4 and 10 VDC 2. To reset this fault, press and hold the reset button on the Fire Eye for 3 seconds, then press and hold the alarm triangle on the Carel controller. i6. “Burner Enable Interlock” Shown on the Carel Display The Carel controller told the burner to ignite, but the burner didn’t prove on or issue a “flame fault” 1. Check the high gas pressure switch. In some cases, if the ductwork was not properly sealed, rain/snow can make its way into the burner and then fill the gas line with water. With the unit off, loosen the pipe union on the downstream side of the valve train and see if water drains out. 2. Check the high temperature limit. If the temperature in the fan housing exceeds about 225F to 250F, the limit will trip and requires a manual reset. If the problem persists, the booth temperature probe may be too far away from the discharge of the AMU, or the gas actuator may have failed in the open position. 3. Check the profile pressure (red and green tubes) to ensure it is lower than .9”w.c. If the pressure exceeds .9”, power is not able to reach the flame controller. Adjust the profile damper so that pressure is .6” w.c. i7. “Booth Doors Are Blowing Open/Too Much Positive Pressure” Several items need to be addressed in order to achieve a properly balanced booth that will also allow the AMU to consistently ignite the burner. “Start-Up” is a procedure that is done when the equipment is new at your facility. The “Start-Up” procedure involves dozens of steps checking various items to ensure things are operating properly. If “Start-Up” has not been performed on the unit, then it is very likely that the booth will not balance (perform start-up outlined in sections A through H of this guide to resolve the issues). Quick items to check:
Are any of the belts broken on any of the fans? Are all of the fans rotating the correct direction? What is the booth pressure set point on the Carel controller? (needs to be 0.000) Is the pressure sensing tube properly connected to the transmitter? Is the exhaust VFD ramping up to 60hz? Is the damper (ARV) at the end of the exhaust stack opening? Are the exhaust filters new? Do the specifications of the exhaust filters match what was supplied by RTT? Are there turns/offsets in the exhaust ductwork? What is the amperage rating of the exhaust fan and how many amps is it pulling at 60hz?
i8 “Low Discharge Temp” Shown on the Carel Display The Carel controller detected that the air coming into the booth is too cold. In an effort prevent damage to equipment/product, the controller will shut off the fans/booth if it detects cold air for too much time. This situation could occur if the booth/area was un-occupied and the system was set in “summer” mode (operator didn’t tell the burner to come on) and the temperature outside drops
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