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Isotherm coolant R134a

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Captain Cook View Drop Down
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Joined: 23 May 2006
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Captain Cook Quote  Post ReplyReply Direct Link To This Post Posted: 23 June 2019 at 14:41
Hi Johan

The scientific approach to evaluate if your system needs topping up is: (be aware, that too much R134a in the system is just as bad as too little)  - Do exactly as I describe in Update 3, that is: Place 4 liters of lukewarm (ca. 16 deg.) water in plastic bottles in the bottom of the fridge, and measure the temperature every half hour, and note when the compressor is stopped/running.
Then put a plastic ice-cube bag (240 ml) in the freezer and after one hour check it every ten minutes.
If your results are better than in my Update 3, you need not to worry.
My Isotherm unit is larger than yours (see picture), so your results should be even better.

My Isotherm is 13 years old, and has never functioned very well. Like you and many others, I have added extra insulation, drilled a lot of ventilation holes and changed the 12V cables to 25 mm2 gauge. (To avoid voltage drop).Some members also have put an extra ventilator by the compressor.

Before the filling of R134a, the compressor worked non-stop, icecubes took forever, and I even mounted a perspex-plate to shield off a part of the fridge, because the temperature was 6-8 deg.


I have not used my newly R134a-filled fridge for a longer period, and not yet in very high summer-temperatures, but my wife and I are already satisfied, that things have changed to the better.
I am not hesitant to recommend a filling of R134a if your fridge is less efficient than mine is in Update 3.



As for the limitation of search results, try to search our problem-child Yanmar SD50, and you will only get 100 (out of 500?) results.
Kjeld

 (I just opened a new topic in ChitChat about SD50 and GL4/GL5).
 






Edited by Captain Cook - 28 June 2019 at 17:05
Freya Hanse400 #27 from 2006, 40HP Yanmar 3JH4E, Teak deck, 3-blade Flexofold, Aries LiftUp Windvane, Exturn 300, Jefa DD1,Simrad NX40,Icom M802(SSB)
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Captain Cook Quote  Post ReplyReply Direct Link To This Post Posted: 28 June 2019 at 09:15
Update 6

Now the Isoterm has experienced a hot summerday, and here are the readings:

This is the text from Update 3 with the numbers from Update 6 in () hyphens.

With an outside temp. of +20(+28) deg Celsius, a starting temp. in freezer and fridge of +16(+24)deg., and 4 litres of water (also +16(+24) deg.) in the bottom of the fridge,
 and the regulator in middle pos., the scientific test started:
After 30 minutes fridge +8(+8), freezer -14(-4)
After 60 minutes fridge +5(+7)  freezer -12(-10) (compressor stopped after 59(81) minutes of work, then worked for 2-3(6-8) minutes after every 30(15) minutes.
After 90 minutes fridge +4(+5)  freezer -11(-11)

Later I made ice cubes, where 0,24 kg water was frozen solid after 100(110) minutes.

The temperature readings after 30/60/90 minutes are accurate.
The running time of the compressor in hyphens() are partly an educated guess, I were working and watching at the same time, but the compressor sure was working overtime.

Summary:
Even on a hot summerday, the Isotherm now is delivering a reasonable performance. In the past I were used to fridge temperatures of 8-10 degrees, and a compressor working
non-stop. The conclusion must be, that if your fridge can not deliver temperatures comparable with my newly refilled Isotherm, it may be about time to phone the technician.

About 5 years ago, being tired of the lukewarm Isotherm, I bought an Engel MR040F-UI portable 40 liter Fridge/Freezer.
I tried the 4 liter cooling down of water for comparision. The 0/30/60/90 temperatures were +15/+9/+2/-4, (+23 out) and the Amperemeter showed 2,9A when the compressor was working.
This is consistant with the stated 32W (V*A). The running time of the compressor was not plotted, but an estimate is 30-40%.
I have used this box both as fridge and freezer, when used as a freezer it can reach -18 degrees.




Edited by Captain Cook - 28 June 2019 at 09:20
Freya Hanse400 #27 from 2006, 40HP Yanmar 3JH4E, Teak deck, 3-blade Flexofold, Aries LiftUp Windvane, Exturn 300, Jefa DD1,Simrad NX40,Icom M802(SSB)
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Captain Cook Quote  Post ReplyReply Direct Link To This Post Posted: 21 August 2019 at 09:27
Update 7:
After cruising Danish waters for 17 days, the Isotherm has passed the test.

I put the perspex divider back in the fridge, so the space behind the door is 6-7 degrees celsius (for cheese, vegetables), and the space under the ice-box is 3-5 degrees. The ice-box has delivered more ice-cubes than I could possible use for my cold drinks. For some reason, the ice build-up on the sides of the box has diminished, after 17 days just a few millimeters.
I still use the Engel fridge box. At a setting of +2 degrees, beer, water and softdrinks are fine.
If you are living with a lukewarm fridge, you should consider getting the system a dose of R134a.
Freya Hanse400 #27 from 2006, 40HP Yanmar 3JH4E, Teak deck, 3-blade Flexofold, Aries LiftUp Windvane, Exturn 300, Jefa DD1,Simrad NX40,Icom M802(SSB)
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