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Old 02-01-2015, 15:24   #31
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Re: Fixing up some old marine refrigeration

From https://www.arctick.org/pdf/RHL%20In...20Brochure.pdf

on how liberal Oz is about refrigerant gas handling:
documentary evidence requirement f
RAC
01 Refrigerant

handling licence
qualified persons
(Full refrigeration
and air conditioning
licence: 2 years)
To handle a refrigerant for any work in the
refrigeration and air conditioning industry,
other than the automotive industry.
Successful completion of an Apprenticeship as a Refrigeration
Mechanic e.g. Proficiency Certificate; or
Trade Recognition Certificate: Refrigeration Mechanic; or
Trade Certificate with a Trade Outcome of Refrigeration
Mechanic and evidence of industry experience; or
MEM30205 Certificate III in Engineering Mechanical Trade
(Refrigeration and Air conditioning); or
UEE32211 Certificate III in Refrigeration and Air conditioning; or
UEE42711 Certificate IV in Air conditioning and Refrigeration
Servicing; or
UEE42811 Certificate IV in Air conditioning Systems Energy
Management and Control; or
UEE42911 Certificate IV in Refrigeration and Air conditioning
Systems; or
UEE50311 Diploma of Electrical and Refrigeration and
Air conditioning; or
UEE51211 Diploma of Air conditioning and Refrigeration
Engineering; or
UEE62511 Advanced Diploma of Air conditioning and
Refrigeration Engineering; or
MEM30298 Certificate III in Engineering Mechanical
Refrigeration and Air conditioning; or
UEE31307 Certificate III in Refrigeration and Air conditioning; or
UEE31306 Certificate III in Refrigeration and Air conditioning; or
UTE30999 Certificate III in Electrotechnology Refrigeration
and Air conditioning.

They also provide a link for training resources, but unless one of those "Certificate" courses is simple...who ever heard of a DIPLOMA in A/C, much less an ADVANCED diploma in A/C, in the US?
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Old 02-01-2015, 15:30   #32
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Re: Fixing up some old marine refrigeration

In the fine print up there is "Successful completion of an Apprenticeship as a Refrigeration
Mechanic "


You have to be an apprentice, and that's 3 years working under a qualified technician....
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Old 02-01-2015, 15:54   #33
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Re: Fixing up some old marine refrigeration

Three years, wow. Who knew A/C was as complicated as law school, med school, any of the PhD programs...No wonder so many shops in the US screw it up.

Or...could it be you've just got some incredibly strong trade guilds down there? Just how is Jimmy Hoffa doing anyway? (sigh)
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Old 02-01-2015, 16:04   #34
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Re: Fixing up some old marine refrigeration

Quote:
I have actually spoken with Hychill a number of times, but the negativity that surrounds HC's is overwhelming. And, I think that it is illegal to charge a system above 300g??? Is that correct?
I found widespread negativity as well bit whilst researching the use of HC's discovered that they are in common use in domestic refrigeration equipment in Europe and figured that if the usual propensity for over-regulation in Europe applied to refrigeration systems and European bureaucrats allowed it's use it was probably safe.

I don't know about the 300g limit but suspect that since the refrigerant regulations are State based there would be seven sets of rules, sort of a rerun of the rail gauge thing.

I found the eutectic with timer system to work very well. The box did not actually have a eutectic tank in it so I just put a plywood false floor in about 100mm above the bottom, pored in about 75mm of water, and rigged a computer fan so that it blew the cold air from the evaporator plate over the top of the water. It was sort of a Rube Goldberg arrangement but it worked beautifully the only down side being the loss of usable volume from having both an evaporator and the eutectic set up in the same box.

I have removed the evaporator and computer fan and am rebuilding the box with a false bottom which will seal (the old arrangement never caused a problem, I just don't like the idea of the possibility of eutectic fluid sloshing about with the groceries) and will install a copper tube evaporator coil under the false bottom.

Danfoss have a controller for the BD50 which allows the compressor to run directly from the solar panels without the use of a battery. I am also considering trying one of these and installing a second thermostat which will control a connection to the house batteries in the event the eutectic fluid temperature rises above the eutectic temperature.
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Old 02-01-2015, 16:09   #35
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Re: Fixing up some old marine refrigeration

Anyway,

Here is a photo of the eutectic plate (never to see refrigerant again I guess).

I'm wondering how I can fit in another 16' of 1/2" pipe and leave any room for the eutectic solution.


Are there any comments on making the holding plate out of marine grade aluminium with copper pipes or stainless steel with copper pipes?
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Old 02-01-2015, 16:17   #36
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Re: Fixing up some old marine refrigeration

Quote:
Originally Posted by RaymondR View Post
Danfoss have a controller for the BD50 which allows the compressor to run directly from the solar panels without the use of a battery. I am also considering trying one of these and installing a second thermostat which will control a connection to the house batteries in the event the eutectic fluid temperature rises above the eutectic temperature.
Yep, I'm aware of that controller as well. I think that I'm settled on a hybrid system running 2 sets of evaporators. I will only do the double evap plates for the fridge and not the freezer as I can't get it apart without destroying the galley.

Since I have access to a aluminium/stainless steel fabrication workshop with TIG, I'm going to custom rebuild. The only issue I can see is getting a techie down to the boat to re-gas. They'll want to charge for the inconvenience.
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Old 02-01-2015, 18:19   #37
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Re: Fixing up some old marine refrigeration

How long are you going to keep theboat?

After 15yrs I changed it all!

No more plates (30kg), gas line down from 1200g to 150g, no system inertia, can reach -18Celsius degrees, and recommend two engines for freezer + fridge
Aaah.... Ampere needed is halved!

Frigoboat...:-)
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Old 02-01-2015, 23:30   #38
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Re: Fixing up some old marine refrigeration

Quote:
Three years, wow. Who knew A/C was as complicated as law school, med school, any of the PhD programs...No wonder so many shops in the US screw it up.
Nah, it's that gen x needs that much training to do anything useful.
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