Filter Operations – Automatic Blowdown Filters

How often does the automatic blowdown filter blowdown?
Well very good question!
Is it a multiple dryer – one filter installation? Is it a single dryer – single filter installation? How much lint are you generating?

Multiple dryer – single filter: 
The filter measures the backpressure at the filter. When lint has sufficiently covered the screen, the sensor, set at .75 WC (or any other setting according to the dryer specification), initiates the six second blowdown. In addition when the sensor recognizes that there is no pressure as a result of all dryers being off, then it blows down.

How can the screen get clean when the dryers are on? 
Blowdown when the dryers are operating is sub-optimum. 50% of the lint drops off, 50% is re-deposited on the screen. The result is a lowering of backpressure to an acceptable point.

When will the screen get “really” clean? 
When all dryers are off, after 30 seconds it will blowdown and the screen will receive optimum cleaning

How often will it normally blowdown? 
In normal multi-dryer operation once an hour blowdown should be anticipated.

Single dryer – single filter: 
The filters senses pressure on when the dryer starts, when the dryer turns off, it senses no pressure and blows down after 30 seconds allowing for the fan to slow down. If during the cycle the lint blanket on the screen raises the backpressure to .75 WC (or any other dryer manufacturer recommended set point), it blows down against the air flow.

How much lint will be generated? 
All cottons, in hospitality and health care generate the most lint. The more synthetics are used, as a portion of the mix, the less lint is generated. 

Blowdown Tests: 
A button on the side of the filter control is a manual switch to activate blowdown. Push the button, after a time delay of 30 seconds, the filter will blowdown. Listen to insure the rotor is spinning. If the rotor is not spinning the screen will clog and fail.

What other time delays exist? 
In normal operation, it will not blowdown until three (3) minutes after the last blowdown. This is in either manual or automatic mode.

Fire Control Option: 
The Fire Control Option senses temperature rise and high temperature (375 degrees F.) and turns on a water spray of 16 gallons per minute, simultaneously it turns on a siren and strobe all supplied by Energernics. At the end of one minutes water spray, siren etc., its senses temperature again, if returned below 375 it turns off.

How do I test the Fire Control System? 
With a butane torch carefully apply heat to the sensor, being careful not to apply heat to the surrounding fiberglass A 5 second manual test button is located inside the cover of the control. It turns on the water, siren, strobe for 5 seconds.

Can I tie the Fire Control System into my building system? 
Yes, simply intercept the signal with a relay as if providing dryer strop with the Fire Control System. The dryer stop wiring is illustrated on the control wiring diagram.