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New unit for 40' sportfish
February 23, 2011
9:49 am
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Steve Pooler
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I see that old unit is rated to draw 7.9 amps...The new 12C is rated at 4.0..

So almost half the power which will help that generator if we add another unit to the salon...

And you won't believe how much quieter the new unit is compared to that old unit...

 

Steve~

February 23, 2011
9:12 am
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Steve Pooler
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Ok...So I wasn't off by much...  Embarassed ....The unit you need is a STX-12C...C is for 230 volt

Make sure that you have 6" duct and around 70 sq in of grill area...

The new unit will be about half the size of that one and the coil will face inboard...Hopefully that will keep at least 2" of gap around it or you could put a return grill in the face of that setee right in front of the coil...

I would remove the outside strainer since you have an internal one...The internal is useless this way...

Replace it with a scoop with large slots so that any grass might move on into the internal basket that you can clean from inside the boat...

 

Steve~

February 23, 2011
8:56 am
bslade
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Hi Steve,

 

Thanks for the excellent reply!  I just emailed you a couple more pictures with the model # etc..........  the model is an SX 12C.

 

As for the thru-hull, inside the bilge is a sea-strainer between the thru-hull and the pump.  Given the issues with the outside scoop strainer plus the inside sea-strainer... maybe this restricts flow too much.  What should I do to change this?

February 23, 2011
8:10 am
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Steve Pooler
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Got your picture….That looks to be a Cruisair Stowaway V model SX-16 with a Reciprocating compressor (as opposed to Rotary)

You can confirm this a couple of ways…One is to remove the small electrical cover (1/4" screw) on the left…you should find a model # either on the face of that cover or there may be a sticker inside once removed…The other way is to look at the compressor data plate, it's model should be AK 8515 E with a LRA rating of 74 amps.

There is evidence showing that the compressor has been sweating (rust stains from under data plate & a bit of black mildew stain on top)

This likely due to reduced or restricted air flow, and also means that the compressor has been attempting to compress liquid refrigerant…

We all know that liquid cannot be compressed, and this may have been the cause of it's demise….I imagine the compressor got noisy toward the end…This would be from the valve plate rattling due to the liquid floodback…Once the plate comes loose it will continue to be noisy even if the cause is corrected…Eventually it will either stop pumping refrigerant, or just lock up altogether from the parts that break loose….

The replacement for that unit will be a Cruisair model STX16-410A 115V…This model is compatiable with your existing keypad/display but if you have the older round cable with flat plugs on each end you will need an adaptor to change the unit end to a telephone type plug... ** you don't have permission to see this link ** 

I can't see the duct size in the picture but you need to be sure it's 7" coming off the blower, and that even if it splits to more than one grill, that you have a total of 80 square inches of grill area…If you don't have close to that…Then that would be one reason for the floodback…another would be dirty coil fins or a dirty return filter.

If the ductwork is smaller & it's too much of a project to correct…Then I would consider stepping down to a 12K unit that only requires 6" duct & 70 square inches of grill area…

The new Turbo 12K unit would likely do the same job as the old restricted 16K unit without damage to itself…Also these new units are 27% more efficent than that older technology…In fact I have replaced several of the older 16's with the new 12K for the same reasons, and my customers were never happier…

Another consideration is your 6.5 KW generator if you are going to be adding another system/unit…These new units are available with "Smart Start" which will lower the starting load by up to 65% over the same unit without…It adds about $380 retail to the price of the 16K (Smart Start alone retails for $450) but that's much cheaper than a bigger generator…Also click on watch video ** you don't have permission to see this link **

As far as your water pickups…You have the wedge type external strainers with small holes to keep grass etc. from entering the thru hull, as opposed to internal strainers with baskets…Ocean Yachts also used these external strainers…They have their advantages as you don't need to clean a basket, but if they do get clogged…Someone is going overboard, and it may be night time, or a dangerous mooring when it happens…

One of the other drawbacks to the small holes is boatyards tend to fill the holes with paint causing restriction & the pump to cavitate thus producing it's own air… 

I also notice a transducer fwd of the pickups…It's hard to tell from the picture if it is inline with the A/C pickup, but It could be causing air bubbles to trail back into the pickups…This could cause the pump to loose prime when underway by sucking up that air…

 

Steve~

February 22, 2011
9:41 am
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Steve Pooler
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You have a PM with an e-mail address…

As far as not working underway…That's usually due to a loss of a fwd facing scoop on the thru-hull…Without one, at anything over around 7 knots the venturi effect of the water passing by pulls the water out of the pump & causes an air lock…Then at rest, it pushes that air back thru & it will start to pump again....If this is true...You will have the same problem with the new unit...

6.5 Kw is going to limit us somewhat on what we can do for underway…You will also need to consider a larger pump & pump relay for two systems…

What is the voltage of the existing unit ?…I could tell with a full model # but…

 

Steve~

February 22, 2011
9:20 am
bslade
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Hi Steve,

 

Thanks for the reply!

 

The old one was pretty inconsistant..... it would work ok while at rest but not well while underway.  I will try to get a cruisair model # for you in a day or so, although if you give me an email address I can send a picture to you.  That might be best.  I believe it is self-contained as there is only the pump in the engine room and under the seat is the condenser unit.  There is then ducking to the outlet.

The power available is 230volt and the genny is a 6.5kw Northern Lights.  The AC in the cabin is used underway and at the dock while the one I am considering in the salon would only be used while underway.

thanks

 

Brent

February 22, 2011
8:25 am
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Steve Pooler
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bslade said:

Good day,

I have a 40' Buddy Davis Sportfish with a Dayboat design- meaning there is an inside cabin plus a salon that has an open bulkhead.  It is a 1993 and I believe the single AC unit in the cabin is original.  It has stopped working and I would like to investigate replacement...What is the old one doing, and when it was working...How did it perform ? It currently sits in a small space underneath one of the bench seats in the cabin.  The boat is located in Bermuda and there are unfortunately no credible marine air conditioning experts so it is difficult to get good advice!

I have attached a photo of the unit for ID purposes (if that helps)...Sorry about the photo thing...My web guy is supposed to be looking into that...Also the unit is labeled as a Model A-285 but I see that may refer to the Digital remote unit...Yes, A-285 is the model # for a SMXII digital control retrofit box...I need the model # or size of the existing unit itself...Or is it a Self Contained all in one unit, or is it a Split type system with part of the system somewhere in the bilge or remotely mounted....any model # off one of those units will help...

My questions are the following:

1.  Can you please help identify what would be the best replacement for the current unit....Yes hopefully with the above info, otherwise we will need to do much more typing  Wink or I can give you an e-mail address in a PM that you can send a photo to.

2.  I would also like to investigate installing a second unit in the salon under one of the bench seats.  Suggestions for the best unit for this application would also be appreciated....In an open air enviroment (no aft bulkhead) it's always tuff but here is one soultion.. ** you don't have permission to see this link **

Otherwise you could go with self contained Turbo units...** you don't have permission to see this link **

What kind of power is available 115 or 230 volt and what size generator...Also where is the primary use of the A/C system...At the dock, or underway ?

Steve~

Regards

Brent


February 21, 2011
5:37 pm
bslade
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I wasn't able to attach the picture... an error kept on coming up after following the instructions!

February 21, 2011
5:34 pm
bslade
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Good day,

I have a 40' Buddy Davis Sportfish with a Dayboat design- meaning there is an inside cabin plus a salon that has an open bulkhead.  It is a 1993 and I believe the single AC unit in the cabin is original.  It has stopped working and I would like to investigate replacement. It currently sits in a small space underneath one of the bench seats in the cabin.  The boat is located in Bermuda and there are unfortunately no credible marine air conditioning experts so it is difficult to get good advice!

I have attached a photo of the unit for ID purposes (if that helps).  Also the unit is labeled as a Model A-285 but I see that may refer to the Digital remote unit.  I

My questions are the following:

1.  Can you please help identify what would be the best replacement for the current unit.

2.  I would also like to investigate installing a second unit in the salon under one of the bench seats.  Suggestions for the best unit for this application would also be appreciated.

Regards

Brent