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What is the recommended compressed air level in psi for pulse cleaning of filters in a Donaldson dust collector?
Pulse pressure can vary anywhere from 7-½ psi to 100 psi depending on the model and size of the collector.

Recommendation: Always refer to the Donaldson Installation and Operation Manual for the recommended pulse cleaning pressure.

I own a Donaldson dust collector that my salesperson designed to operate at 5,000 cfm and a 2:1 air-to-media ratio. A year later, I need to collect dust from three more stations. Is there a problem if I just add the extra equipment and duct and open the fan damper to allow more air through the collector, which would allow me to collect dust from the new stations?

The main result or problem this would cause would be shortened filter life. How much shorter would depend on how much of an increase of air and dust loading that was allowed to the collector. Other possible results could be abrasion or wear to double dump valve or screw conveyor

Recommendation: Contact your local Donaldson Sales Engineer Representative for recommendations.

During the winter when the temperature drops below 20 degrees, the solenoids which activate pulse cleaning on my Donaldson dust collector freeze in the closed position and the collector cannot pulse clean the filters. In the past, I have continued to collect dust and blinded the filters. I then had to replace the filters to get adequate airflow through the collector. What can I do to avoid this problem?
The first and most important thing is to make sure you have an adequately sized and maintained compressed air dryer. Many different types of air dryers are available for this purpose at a variety of prices. Solenoid heaters are also available for some solenoid enclosures. These are thermostatically controlled, operate at 120 volts and installed inside the solenoid enclosure.

I was recently told that I should not store dust in the hopper of my Donaldson dust collector. Why is this?
If you attempt to store dust inside the hopper, the turbulence of air caused by the fan will keep this dust in suspension. The more dust you have, the more dust that will be suspended. This dust will eventually overwhelm the cleaning system of the collector resulting in a high-pressure drop and plugging or blinding of the filters.

Recommendation: Anytime the fan is running and collecting dust, the opening to the dust barrel should be open or the rotary valve, double dump valve or screw conveyor should be in operation removing dust from the dust collector.

I have a Donaldson dust collector with a Delta P Control which is used to monitor and maintain the pressure drop. Lately, I have been getting pressure drop readings above 6 inches but the airflow at the hoods still seem to be good. Is there a way to recalibrate to make sure that the readout is correct?
Yes.
Due to either slight changes in electronic components over time, or pressure differentials within the plant environment, occasionally the display may show numbers other than 0.00 while at rest. If so, recalibrate the zero point. Consult your Donaldson Installation and Operation Manual for instructions.

I have just installed my Donaldson Vibra Shake™ intermittent-duty dust collector. As I understand it, whenever I shut off the unit, it is supposed to wait a predetermined length of time then turn on an internally located motor which shakes the dust off the filter cartridge. My collector does not go through a shake cycle. Is my collector shaker broken?
The Vibra Shake dust collector may be sold with the controls configured in one of two configurations, “Ambient” or “Delta”. In the “Delta” configuration, the shaker controls are only activated when the pressure drop across the filter exceeds 3’wg. If the control circuit is configured for “Ambient” operation, the collector will go through a shaker cycle every time the fan is operated for 30 seconds then shut off. If your collector was set up in the “Delta” configuration, it may not have attained a 3”wg. If your collector was set up in the “Ambient” configurations, it may not have been run the 30-second time frame needed to activate the timing logic energize the shaker motor.