You need to clean the plates in the machine w/ a 50-50 solution of ammonia & water or the plates are burned out & you need to replace them. I can help you w/ both.
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The graduations are incremental for your ozone output for the purifier control. Generally, the machine can put out enough ozone to cover 3000 sq ft. (when the control is moved all the way to the right, about 5 o'clock.) Half way should be about 1500 sq ft or 12 o'clock. For general air cleansing, you should set the purifier control to produce enough ozone so you smell it when walking into the room (after home) for about 30 seconds. The ozone smell should disappear after that. If it lingers, you've got it set too high. For more severe odor control you can set it higher but remember that some of us are more sensitive to the odor no matter what the setting. It may need some adjustment based on your individual preferences.
I'm confused about the 'red plates' as you mentioned. The original machine comes w/ 2 ozone plates (made of glass) and doesn't produce ozone when one of the plates is removed. I'm guessing that the lines may tell you when you're engaging both plates to work, i.e. more ozone being produced & blown into the room or less only calling on one plate to produce ozone. If you send me a close up pic of the control panel I may be able to tell you more.
He probably cleaned the unit and restored the plaques. Green light or no green light, it doesn't affect the production of ozone. If still in doubt, when you go to pick it up, have him operate fit or you before you leave the store. I've had one 7years and the green light hasn't worked for three years. I clean it regularly and it still produces ozone when needed. Regular, routine maintenance is the answer.
the UV lamp does produce some ozone .. this one specifies .04 ppm .. thats not very much but might be detectable as a slight fresh air odor .. some other types use electrostatic filtering and some even have strong ozone generators .. ozone does kill bacteria, fungus and such and will freshen the air removing many odors but is not considered healthy in large or concentrated amounts or for prolonged periods .. the UV lamp will also kill bacteria and fungus without producing so much ozone.
Purifying Method: Photoplasma, UV, ions, and ozone.
You probably have a burned out high voltage transformer. That's what produces the ozone. Helpful hint...........the high voltage transformer is also the one used in bug zappers
You can pull off the rear filter, pull the ozone plates, defeat the safety interlock, turn the unit on, and place a screw driver (holding the plastic handle) one one of the ozone bars, and try to make an arc between the screwdriver and the other bar.
If you get an arc, the ozone plates are dirty. Clean well with a brush and sudsy ammonia. If no arc, either the hv transformer is bad, the main circuit board is bad, or the ozone control is bad.
There's one other thing you can check: The two wires that connect to the ozone bars can arc to the chassis sometimes. You can inspect the insulation on those wires to make sure it is intact.
My XL-15 had the same problem a few years ago. I had a broken wire on the fan, and the Ozone problem turned out to be a problem with the power supply. I had to send it in to have it repaired.
The Food and Drug Administration requires the ozone that is given off by medical devices that are used indoors to be no more than 0.05 ppm.
If you have a manual, does it specify the amount of ozone given off?
I'd be interested in the figure.
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