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Old 28-05-2016, 11:07   #61
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Thumbs up Re: BD35 compressor not making frost on plate .


Hey looking good.
The final tweaks of the TXV can be made in the box but your amps, and pressures look right. Once in the box, tweak the TXV to get 2-3psi on the low side and you will be perfect. How does the sight glass look?
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Old 28-05-2016, 11:59   #62
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BD35 compressor not making frost on plate .

Hey Rich ,

I have two sight glasses one just before the TXV and one on the reciever dryer . The one at the dryer was showing no bubbles but the one at the TXV had a little bubble so I gave it one more squirt of refrigerant and it disappeared . It stayed clear at all compressor speeds , you can see the bulb in the ice in the photo , won't need that once I get it in the box . Now I have a full set of Hvac tools . Should come in handy down south 🤓

Regards John


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Old 28-05-2016, 12:11   #63
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Re: BD35 compressor not making frost on plate .

Great work John...
Sounds like you are perfectly charged!
A cruiser can NEVER have too many tools...and you never know when your dock buddy may want to trade a few beers for you to vacuum down his system!!!
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Old 04-07-2016, 06:58   #64
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Re: BD35 compressor not making frost on plate .

Hey Rich .

I got the system installed yesterday , just roughed in so far . Turned it on a 5pm at low speed in an empty 7.7 cubic foot box . System started to make cold right away and froze the plate quickly . I placed two water bottles at the bottom of the box, this morning at 6am they were ice . Temperature in the boat was around 78 . I have not checked my pressures yet or tweaked the TXV I will do that tonight . But I am surprised the system brought down the box that fast on low speed , Very pleased !

I will start a new thread on my build including the box and insulation once I get it completed with shelving and thermostat installed . Will also give daily amp hour usage measurements

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Old 04-07-2016, 09:05   #65
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Re: BD35 compressor not making frost on plate .

Great news....
Cool Beer and Ice Cream on the boat turns camping into Cruising...ha ha ah
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Old 13-07-2016, 08:35   #66
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Re: BD35 compressor not making frost on plate .

This system is working great .

I have had it in the box and running for the past three days with all the shelving and half full of food in this hot weather , Boat is closed up during the day and it gets warm inside , around 85 degrees a little warmer then out side . I tweaked the TXV for 2 psi of suction at 35 degress box temperature . I keep it between 2 and 4 degrees Celsius all the time .

So far my amp hour usage averages out to 27ah for 24 hours for this 7.7 cubic foot top loading box , so needless to say I am very happy.

When I get time i will start a thread with all the build photos

Now to do the same to the freezer.

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Old 23-07-2016, 04:36   #67
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Re: BD35 compressor not making frost on plate .

So do I understand correct that this tweaked system makes more BTUs than the original one in ideal conditions? If so, why? Because of the larger condenser? Because of the receiver dryer? Or because of the TXV?
I know its early to say but could this system be more reliable than say a standard AB BD 35 system off the shelf?
How about the budget? How much did you spend on the new parts?
CCheers
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Old 23-07-2016, 05:37   #68
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Re: BD35 compressor not making frost on plate .

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Originally Posted by ErikFinn View Post
So do I understand correct that this tweaked system makes more BTUs than the original one in ideal conditions? If so, why? Because of the larger condenser? Because of the receiver dryer? Or because of the TXV?
I know its early to say but could this system be more reliable than say a standard AB BD 35 system off the shelf?
How about the budget? How much did you spend on the new parts?
CCheers

To your questions ,
YES YES AND YES .
this is a little article I found describing some of the advantages.

Thermal Expansion Valve - Thermal Edge

The main reason they are not used in small marine refrigeration systems is PRICE.

I think I spent about a thousand dollars putting my system together from cobbled up parts on e bay and Rparts , thats not including the tools.
But i am very happy with my system and am about to build another one for my freezer.

Technautics Cool Blue system uses a TXV in there system. It is three times the price of a comparable capillary system but well worth the money .

They use a holding plate which works just fine , but I wanted tighter control over box swing temperatures so i used a flatbond evaporator plate . Nobody builds a system like that, so i built one .

As for reliability a capillary system is very sensitive to dirt or moisture . Because you are not limited to the amount of refrigerant you can put in a TXV system, you can install a very large receiver dryer , which takes out much more moisture and has a very large filter area to stop any particles from jamming in the capillary tube which is a huge problem . Also you can have a huge condenser for just the same reason and this is another thing that just makes it all work more efficiently. I am using a 10 inch low rpm fan on my condenser and you can not hear it run. I am getting a great amount of subcooling through it.

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Old 23-07-2016, 05:44   #69
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Re: BD35 compressor not making frost on plate .

Just to add . Capillary systems are designed to work in a controlled environment such as a house were the temperature is a constant, and they work fine . We have boats, we like to move our boats. Temperature swings are massive inside a boat . We all need a TXV system !!!!

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Old 27-11-2016, 07:40   #70
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Re: BD35 compressor not making frost on plate .

Almost a year in and the whole thing leaked out and blew up !!
Just kidding , still working great . It's actually a little boring , I like to tinker and there has been no reason to touch the system . Got bored of counting the amp hrs as well but now since the cold weather is here I took a look and I am using well under 20 amphrs a day . Temperature outside is 0 c and 22 C inside .

Regards
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Old 27-11-2016, 09:15   #71
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Re: BD35 compressor not making frost on plate .

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Almost a year in and the whole thing leaked out and blew up !
My heart missed a beat when I read that..
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Old 27-11-2016, 10:46   #72
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Re: BD35 compressor not making frost on plate .

Thanks Eric , sorry about that lol .
No all is working well , I'm just about to install the freezer condensing unit , just finishing up a bunch of tests on it and in it goes, never to be seen again .
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