Hydor Koralia Evolution (1 Viewer)

[mwilliams62]

Hi guys need some help here.. I have had two Hydors that some how changed the flow instead of blowing out like they are suppose to they ended up sucking in the water?? Any thoughts as to why this is happing??? I have never had this problem with the older verisons only the new ones.

 

[steveb]

There is a bushing that needs to be replaced. Contact USA Hydor customer service at this email address below and tell them what is happening and which model evolution you are using. They should send you out a new one via USPS.


Hydor USA, Inc.
Customer Service
4740 Northgate Blvd #125
Sacramento, CA 95834
www.hydor.com
hydorusa.office@hydor.com

 

[mwilliams62]

Thanks Steve sent them a email. i cleaned then out and seem to be working okay for the moment.

 

[steveb]

Thanks Steve sent them a email. i cleaned then out and seem to be working okay for the moment.

YW. Mine still do it occasionally and cleaning does seem to help.

 

[mwilliams62]

My old ones have never done this before... if they continue to do this I might look into another brand.

 

[tang]

I have two of them and they both do that...if you plug and replug for some reason the flow reverses....but if you turn the plug around and plug in it will start flowing correctly again.

 

[mwilliams62]

When I checked the propeller the magentic part was severaly scratched up all the way around it.

 

[steveb]

Sounds like something go in there with it or it got out of alignment. I would see if you can get them to replace it.

 

[mwilliams62]

I did and they sent me two bushings and no propellers. Will have to contact them again.

 

[steveb]

I did and they sent me two bushings and no propellers. Will have to contact them again.

Yeah I would tell them what you want. Like I said they where real responsive to what I wanted but it did ship USPS.

 

[tang]

Curious to see...was the reverse flow problem fixed on the Koralia?

 

[steveb]

Assuming the shaft bushings are intact check to see if the rubber stop in the front cover is still intact. This is the part that the prop will hit if it spins backwards and cause it to bounce and then change direction.

 

[SuperRay]

I believe that is also a property of an AC motor in which it can start running backwards depending on where the armature is relative to the magnets (hence the bushing and shaft bearings wear causing issue also) and where on the sine wave the power is when it cycles (something like that anyway). Most wave makers (and aquarium controllers like the RKE and APEX for example that I a familiar with have a zero-crossing detection so that the outlet isn't powered until the wave AC sine wave is at it's zero point so that for example a motor doesn't become locked when starting and stopping repeatedly). On the larger Koralia Magnum Pumps there is an electronic startup device to prevent this from happening (it may have changed now but they didn't used to be on the K 1-4 line). On the DC motor that is a different story all together. I use K8's with a controller now because I didn't want to take a chance on having a pump run backwards without knowing that it's not flowing properly.

 

[steveb]

I believe that is also a property of an AC motor in which it can start running backwards depending on where the armature is relative to the magnets (hence the bushing and shaft bearings wear causing issue also) and where on the sine wave the power is when it cycles (something like that anyway). Most wave makers (and aquarium controllers like the RKE and APEX for example that I a familiar with have a zero-crossing detection so that the outlet isn't powered until the wave AC sine wave is at it's zero point so that for example a motor doesn't become locked when starting and stopping repeatedly). On the larger Koralia Magnum Pumps there is an electronic startup device to prevent this from happening (it may have changed now but they didn't used to be on the K 1-4 line). On the DC motor that is a different story all together. I use K8's with a controller now because I didn't want to take a chance on having a pump run backwards without knowing that it's not flowing properly.

I run my two 750 evo's on a Neptune DC8 controlled by an ACJr. I still get them spinning backwards on occasion. It's usually more of a problem when the pumps become gunked up for some reason.