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 Post subject: Tuning my Marine sources RDC-850
PostPosted: Mon Dec 22, 2014 10:21 am 
Flagellate
Flagellate

Joined: Tue May 14, 2013 4:30 pm
Posts: 420
Location: Napier
Hi all

Can someone please help me in tuning my skimmer. I have never gotten a decent skim from it and at the moment it is skimming very wet.
I have the manual which is all but useless. The only operating guideline it gives is to sit the skimmer in 180-230mm of water(actually the manual says 18-23mm but I assume that is incorrect)

This skimmer has a pipe for adjusting the water level and a silencer with no air adjustment except for the fact that the silencer has 2 outlets, I am guessing 1 is so you can connect ozone or similar.

Under operation I have tried
1. Blocking 1 silencer outlet, this creates more air and a greater amount of bubbles exiting the water outlet but does not result in a dryer skim
2. Partially blocking with wool both outlets. This is the best I have gotten from the skimmer to date
3. Both open, this results in a venturi sucking noise which is quite loud and a very wet skim. The bubble formation on the top of the water is very small
4. 1 blocked completely and 1 blocked with wool partially. No improvement.

Obviously I have also raised and lowered the water in the body with the adjusting tube a lot to try and find a good spot.
Does anyone have any familiarity with this or similar skimmers and can assist me in getting better skimming performance.
I realise it is not one of the well known, better class of skimmers however for a 300 litre tank like mine it should be able to do the job adequately.

Thanks
Steve


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 Post subject: Re: Tuning my Marine sources RDC-850
PostPosted: Mon Dec 22, 2014 10:50 am 
Pteropod
Pteropod

Joined: Sun Feb 11, 2007 10:12 am
Posts: 3144
Location: Wellington
How long has the skimmer been running?



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 Post subject: Re: Tuning my Marine sources RDC-850
PostPosted: Mon Dec 22, 2014 10:51 am 
Flagellate
Flagellate

Joined: Tue May 14, 2013 4:30 pm
Posts: 420
Location: Napier
Over 6 months. Should be bedded in
For any not familiar with it these are apparently similar to the nac7 in design
I think its useful to note I have an auto top off so the water level is constant.


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 Post subject: Re: Tuning my Marine sources RDC-850
PostPosted: Mon Dec 22, 2014 11:13 am 
Pteropod
Pteropod

Joined: Sun Feb 11, 2007 10:12 am
Posts: 3144
Location: Wellington
Don't play round with the air intakes, you shouldn't need to and when you do it will screw with the internal water level and make it impossible to tune anyway. The less air you have going into the pump the more water will have to go in which raises the internal water level and makes it skim wet. Also worth stripping down your pump and pay special attention to the air inlet, if you have a salt build up or a manufacturing defect blocking in there it will cause problems as well.

If you have the water level gate fully open and it is still skimming wet the only thing you can really do is raise the skimmer.



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 Post subject: Re: Tuning my Marine sources RDC-850
PostPosted: Mon Dec 22, 2014 11:25 am 
Flagellate
Flagellate

Joined: Tue May 14, 2013 4:30 pm
Posts: 420
Location: Napier
Okay
Have unblocked them both. The loud venturi noise I assume is because there is some water in the air system somehow.
The silencer itself is sealed so where is it likely to be and will it quite down over time?


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 Post subject: Re: Tuning my Marine sources RDC-850
PostPosted: Tue Dec 23, 2014 9:46 am 
Flagellate
Flagellate

Joined: Tue May 14, 2013 4:30 pm
Posts: 420
Location: Napier
The noise was ridiculous so I made a silencer to silence my silencer from a medicine bottle. works well and now the air intakes are fully open its skimming better


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 Post subject: Re: Tuning my Marine sources RDC-850
PostPosted: Tue Dec 23, 2014 10:18 am 
Pteropod
Pteropod

Joined: Sun Feb 11, 2007 10:12 am
Posts: 3144
Location: Wellington
Did you see if you could pull your silencer apart? It might have condensation inside it causing the noise



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 Post subject: Re: Tuning my Marine sources RDC-850
PostPosted: Tue Dec 23, 2014 10:21 am 
Flagellate
Flagellate

Joined: Tue May 14, 2013 4:30 pm
Posts: 420
Location: Napier
Yes I tried and it is a completely sealed unit


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 Post subject: Re: Tuning my Marine sources RDC-850
PostPosted: Tue Dec 23, 2014 11:19 am 
Flagellate
Flagellate
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Joined: Wed Nov 28, 2012 7:05 pm
Posts: 309
When I ran one the water level was sitting around the outflow tee. Either just at the top of the outflow or halfway up the hole where it exits. Maybe 16/17cm? I forget.


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 Post subject: Re: Tuning my Marine sources RDC-850
PostPosted: Tue Dec 23, 2014 11:23 am 
Flagellate
Flagellate

Joined: Tue May 14, 2013 4:30 pm
Posts: 420
Location: Napier
Thanks. If it needs further tweaking I will try raising it higher


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