Friday, September 4, 2015

We had twins!



Sort of....no we're not pregnant (phew!) but we did have twins.  Welcome to our world, Olaf and Sven!
 
YAAAAAY!  Olaf and Sven

This blog will be on the more technical side, going through the process of how we decided to choose what we did versus options available, careful destruction (removal) of the former system and surprises, and installation of the Olaf and Sven.  If you're bored by this kinda stuff, check out the pretty pictures and wait for Monica's next blog post.

So on Friday August 21, Jack took his final breath, see post from Friday Aug 21.  After that we had to jump into action to research and decide what type of system we would be changing to and whom to buy it from.  Fortunately we had some insight going into this, neighbors of ours had recently swapped out their reefer system to a keel cooled freezer with evaporator so they became a quick source of information for us.  Our family friend Greg recommended a fix-it guy to come take a look to confirm Jack's passing and to give a bit of advice on how to move forward.  And, of course, we had internet access.  

A little background on refrigeration and cooling systems.

Much like a car with a radiator, refrigerators need to remove heat.  It is the removal of energy (heat) which makes your refrigerator and freezer cooler.  The heat which is removed is carried away by a cooling agent such as radiator fluid.  Then the cooling agent needs to be cooled.  In a car this happens as the coolant runs through a looping circuit of tubes in the radiator cooled by passing air.  In our boat we also have that option, known as an air cooled system, we would just have a fan blowing on the 'radiator'.  Also on a boat we can have ocean water sucked in and have that help cool down the cooling agent, that's what we had on SeaGlub, aka Jack.  Another option is a 'keel cooled' system.  This is pretty much the same as water cooled system but the cooling agent runs through a 'radiator' attached to the bottom of the boat.  The keel cooled systems seem to be the more popular newer choice because they run fairly efficiently because water acts better to remove heat than air.  Our older water cooled system which brings ocean water onto the boat to cool the coolant requires much more electric power and electrical power on a cruising boat is a precious commodity.   

So the the first 24 hours after Jack's passing were spent deciding on what type of system.  Since we had just lost our water cooled system, which included an electric pump to cycle water through the refrigerator in order to cool the cooling agent back to a liquid, we already had a hole in the boat (aka thru-hull) to use in the event we wanted to upgrade to a keel cooled system,  After a blitzkreig of web surfing and various phone calls and the visit from the fix-it gentleman, we came to liking Technautics CoolBlue air cooled system (for those familiar they also manufacture the Cruise RO Water Makers).  Several reasons for us:

1) very low power draw, 3-4 amps per hour (about what your halogen light bulb uses in your reading room
2) track record - they have been around for over 3 decades
3) customer service - they were excellent throughout the process, always returning calls and emails promptly, critical as they advertise this as self install product
4) 5 year guarantee

Here's a quick boat show video from Bob Bitchen:

CoolBlue video

Why we didn't choose a keel cooled system?  First we would've needed a haul out for that.  Secondly, the CoolBlue system would allow us to reuse the existing coldplates, and personally I prefer the idea of coldplates over evaporator system despite the fact that the coldplates take up so much room.  In the tropics I just like the idea of having a thick, cold plate storing coldness and allowing the compressors to run less often.

So that's how we got to where we were.  And of course we chose the system so clearly we liked what we were doing and going to be biased to it, but I see the benefits of the other systems and maybe even other providers, but I can tell you we were extremely pleased with the service we received from Technautics.  So now for the process of removing and installing....

I'm not sure what was more difficult, getting the old system out or the new one in, or..... stressing out about how to install the new one with no hands-on help.  Removal was a bit ugly, here's the old set up:
 
Jack - compressor is the black item upper left, which was piston driven, the 3/4 horsepower motor to the right, and the white tubes wrapping around the top acted as the 'radiator'.  This all came out.
Removing Jack from underneath our bed
Monica can almost fit in the area once Jack is removed
These are the insulated foam wrapped copper tubes (bottom tubes, black wrapped) behind my closet with two white thermostats behind everything at the top. Ice box and refrigerator box are to the left.
Here's the mess which developed as we pulled out the old tubing and gauges.
Inside of freezer box before removal...

...and inside of freezer box after removal of coldplates

Installation yoga
More installation yoga
Work bench in forward cabin for two weeks, this is how my dad's bed looked the day before his arrival for a weekend visit
Technautics CoolBlue lab
 
Removed the old needle temp gauges
New LED gauges on ABS plastic.  We picked up a scrap piece of ABS for $2, drilled holes, and then used a metal hand file to carve out the space
LED gauges viewed from behind


Gauges installed and at work 

Mounting the new compressors was a unique challenge.  Originally as we measured the CoolBlues they would fit just right by no less than a half inch but after trying to put them in they were actually a half inch too big in overall area.  What we did was took the old mounting board and cut it, then drilled holes and inserted set screws into the plastic mount board and locked them tight with epoxy. Then, flipping the board over we put rubber stoppers over the screws then mounted the compressors on top of these.
 
Mounting area

Under side of mounting board with countersunk screws filled with epoxy

Mounting board installed

The only problems we had when reinstalling were mounting the coldplates back into the reefer and freezer.  The coldplates are heavy and getting them reinstalled took the both of us contorting and sweating but we got them back up.  Then we realized it may have been easier had we connected the 2 coldplates together before mounting them back into the freezer.  The picture below shows how close we were to having a perfect mounting set up, but that half inch to get these two copper tubes to connect took us about an hour....but alas....

Nearly connected freezer coldplates

And finally there was the electrical.  Mechanical and construction skills I have just enough to be dangerous, electrical work I'm just dangerous.  This was the circuit board for Jack, with a solenoid, relay and all kinds of wires.
 
Jack's original electrical set up

We were able to gut the old system of all the extraneous items because of the simplicity of the Technautics system.  Below is what we were left with.  


  
And of course, the first thing back in the refrigerator..... (don't worry, the beer was still in the cooler on ice)


2 comments:

  1. Nicely done guys. My friend Joshua has me convinced to go air cooled, I wonder if one plate would be enough in my small box? It looks like a great system and very nice install!

    ReplyDelete
    Replies
    1. Thanks Nick! as FYI we have one plate in our refrig (two in the freezer) and both are about 6 cubic feet. The refrig thermostat is set at the lowest possible setting and the temp runs at about 39-40 degrees. We had it set at a middle range on the thermostat originally of 3-4 (max is 7) and the temp was 28 degrees. We didn't experiment but I'm guessing had we cranked it to 7 we could've had the refrig with just one plate down to 20 degrees.

      Delete