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Booth Balancing
d1. _____ Close the doors on the booth then check the booth pressure on the Corel controller. The booth pressure should be in the negative range at least -0.099, which will allow for exhaust chamber filter loading. - If booth pressure is negative, adjust the “booth pressure set point” to -0.003 then allow the booth to stabilize (continue to step d4). - If booth pressure is not at least -0.099 or is positive, then the exhaust system will need to be checked/modified to allow the booth to go negative.
d1a. Check exhaust duct for restrictions. Ensure the ventilator gravity damper at the end of the duct is opening. By default, RTT designs the exhaust system for .5” w.c. which allows for no turns or offsets in the ductwork. If there are offsets, transitions and/or elbows in the duct, the fan may not be rated to handle the additional static pressure created by the turns. Check the plan view/approval drawing of the booth to determine the exhaust fan CFM & static pressure capabilities. Double check fan rotation. d1b. Check the exhaust filters. By default, RTT designs an exhaust chamber for single stage filtration. If the customer has installed a blanket and pocket filters, the fan may not be rated to handle the additional static created by the filters. Check the plan view/approval drawing of the booth to determine the exhaust fan CFM & static pressure capabilities. d1c. Check the exhaust motor amps at 60.00hz. If the amps are lower than the rated motor FLA, the exhaust VFD will need to be adjusted so that the motor drives up to FLA. Example: motor is rated for 7.6a but is only drawing 6.1a. Adjust VFD to higher frequency such as 65.00hz. Continue adjusting up until FLA is achieved. P77 = 2 (Unlock) P1 = new max freq reference (start at 65 then check amps) P55 = same as P1 (freq monitor reference)
P125 = same as P1 (freq setting gain) C2 = same as P1 (freq setting bias) P77 = 1 (lock – Do this after amp checks)
d1d. If the booth still will not go negative after all of the above have been adjusted, then the AMU fan speed may need to be reduced. Reducing the AMU fan speed will cause the burner profile pressure to drop. The pressure must be between .5” and .7” for proper combustion. As the AMU fan speed is reduced, the profile damper around the burner will need to be manually closed to increase the pressure across the burner. Follow these steps: d1e. Reduce AMU fan speed by 3hz P77 = 2 (Unlock) P1 = new freq reference (lower than 60hz) P2 = minimum freq reference (needs to be lower than P1) P55 = same as P1 (freq monitor reference)
P125 = same as P1 (freq setting gain) C2 = same as P1 (freq setting bias) P77 = 1 (lock)
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