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Why is my mastercool evaporative cooler making a rythmic knocking noise?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: noise on mastercool

had the same symptoms and found that tightening the squirrel cage set screws eliminated the noise.

Posted on Jul 01, 2008

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  • 1 Answer

SOURCE: AC pad not fully getting saturated with water

1. Make sure the pump is getting plenty of water.

2. Make sure the pump is working.

3. Check the pvc pipe with drip holes are not plug. (above the pads )

4. Check the pads directional arrow that should be facing up. When pads are initially installed you can see arrows on the pads. The arrows should be in the up direction. That will allow the pads to get saturated more efficiently.

I hope these steps help you.

Jerry,

Posted on May 08, 2009

Ed Phillips
  • 11 Answers

SOURCE: New Mastercool pads smell bad

The cellulose pads in a mastercool are glued together and usually the adhesive is what you smell. It may take a while for it to go away. Strange as it may seem, as the pads get more mineralization and you use it more the smell will go away. Do not use a cooler for your whole house without plenty of exhaust through a window or an updux. Coolers work best when there is plenty of freely moving air.

Posted on May 31, 2009

Ed Phillips
  • 11 Answers

SOURCE: loud rumbling noise in mastercool a/c

This type of cooler has "pillow bearings" where the squirrel cage fan rests in the frame. They must be lubricated with oil at least yearly. If they go dry the bearings can wear out and cause the noise. Oil them first to see if the noise is less and maybe you can get by without replacing them. If the noise is still there you may need a bearing replacement. Always turn off the power to the unit before you work on it.

Posted on Jun 20, 2009

  • 6 Answers

SOURCE: I need a wiring diagram for a mastercool

Here is a link to the owners manual for the new Symphony brand evaporative cooler. Symphony is the new name for the old Adobeair brands Mastercools.

The owners manual will have the motor and pump wiring schematic.

Posted on Feb 14, 2010

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The owners manual will have the motor and pump wiring schematic.

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We have a Mastercool II & it was installed ~ 3


The pads you need are at least 8 inches thick. If you have the contractor model, then the pads will be 12 inches thick.
Find a distributor in your town that sells cooler parts, if they dont have them, some of the big home improvement stores carry the pads for your cooler.
Make sure you are using a bleedoff or a dump pump to eliminate the hard water out of the cooler. If you keep those pads clean, they wiil last for many years.

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My husband wants to install a mastercool evaporative cooler in a building that is completely open on one side. We live in AZ.


It will work fine as a spot cooler if he has direct airflow on him, otherwise it wont do much for cooling the building.

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2 Answers

Loud rumbling noise in mastercool a/c


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unbalanced mounting or unbalanced fan. check how it stands and make adjustments.

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Noise on mastercool


had the same symptoms and found that tightening the squirrel cage set screws eliminated the noise.

May 23, 2008 | Mastercool 67680 Evaporative Cooler Air...

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