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Fridge

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350Bob View Drop Down
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Joined: 24 August 2015
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 350Bob Quote  Post ReplyReply Direct Link To This Post Topic: Fridge
    Posted: 05 June 2022 at 12:44
Hi, we have what I believe is the original refrigeration equipment installed in our 350, an Isotherm BD35F compressor with a flat 250mm x 350mm evaporator plate mounted with the longer side vertically. We have recently been told that this evaporator plate is designed be mounted horizontally with the inlet and outlet at the top. This sounds like it could be true as the top half of our evaporator plate never gets really cold. So I have two a few questions please:
  • Is this the standard set up on the 350 as built by Hanse? If not what is?
  • Has anybody tried fitting the 250 x 350 x110 L shaped evaporator plate?
  • Are there any other configurations that people have found to work?
Although our fridge works it really struggles when the air temperature gets above 30C and the plate ices up really quickly.

Many thanks

Bob
H350 #205
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JUTTER View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote JUTTER Quote  Post ReplyReply Direct Link To This Post Posted: 06 June 2022 at 19:09
Hi Bob,

I join a picture of the Isotherm label on my H350 (2010). Not sure it is exactly the same model of compressor you mentioned.
The evaporator plate (250x350) is mounted the same way as yours: the longer side set vertically. And it does get really cold at the top.

Claude

JUTTER, Hanse 350#0256, 2010, deep keel, Zeeland
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350Bob View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 350Bob Quote  Post ReplyReply Direct Link To This Post Posted: 08 June 2022 at 19:05
Hi Claude,

Thanks for that information, it looks my installation is original so I maybe have something else wrong with it.

Best wishes

Bob
H350 #205
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coriolis2 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote coriolis2 Quote  Post ReplyReply Direct Link To This Post Posted: 21 March 2023 at 07:54
The fridge struggles because there is NO insulation around the fridge. I installed 2 sheets of Rockwool and spent 2 cans of PUR. makes a real difference in power usage over the day.

"Coriolis" H350 #045 (ex Waarschip 570 #? 1987/1992, ex Waarschip 28LD #7 1994/2007)
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350Bob View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 350Bob Quote  Post ReplyReply Direct Link To This Post Posted: 21 March 2023 at 09:42
Thanks for your reply, can I ask where you used the insulation sheet and where you injected the polyurethane foam please? I am cautious about using the expanding foam as I have used too much on other projects and forced things apart.

Bob
H350 #205
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martijnvdh View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote martijnvdh Quote  Post ReplyReply Direct Link To This Post Posted: 21 March 2023 at 12:14
I will be doing a test soon with Instapak "sealed air" packaging bags for insulation of the fridge on our 371. I tried with self-adhesive 19mm armaflex sheets, but even after cutting an access hole in the backrest of the couch, I can't get enough access behind the fridge to get it glued in.


Normal PU foam absorbs water over time unless sealed in some way. The test I intend to do is to join two sheets of 18mm multiplex together with a 5cm gap in between and see what happens with one of these instapak bags in between. Will share some info and pictures.
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Ian Coverdale View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ian Coverdale Quote  Post ReplyReply Direct Link To This Post Posted: 21 March 2023 at 15:15
... also check there is good ventilation around the compressor unit. Hanse mounted ours in poorly ventilated box. They also installed a length of flexible hose but did not connect it. Compressor is a heat pump; extracts heat from the coolbox but must then be able to dump that heat somewhere.



Edited by Ian Coverdale - 21 March 2023 at 15:16
Ian & Andrea
SV Gabrielle (H445)
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Ian Coverdale View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ian Coverdale Quote  Post ReplyReply Direct Link To This Post Posted: 21 March 2023 at 15:31
System is an Isotherm Compact Classic.  Only reference in installation manual referring to orientation is below. Cannot see anything to say pipe must be at top or bottom

2.11 Locating and Installing the Evaporator

The evaporator can be mounted horizontally or ver- tically on a sidewall near the top of the box, acces- sible from the box opening. In positioning the evaporator consider the routing of the refrigerant lines out of the box.

Mark the location of the mounting holes, drill and attach the evaporator with the screws and the plas- tic standoff spacers provided. Do not use screws longer than those provided, as they will penetrate the insulation (fig. 6).

Ian & Andrea
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perry View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote perry Quote  Post ReplyReply Direct Link To This Post Posted: 22 March 2023 at 08:38
Anyone interested in improving fridge operation;
Last year I fitted a cheap electronic thermostat and internal small fan to circulate air over the evaporator plate. The improvement in efficiecy are remarkable, reduced battery drain and accurate temperature, and fast pull down to temp. The original mecanical thermostats really dont work well, the electronic unit is programmable so you can ease the load on compressor startup. And coupled with the simple cheap 12v fan from PC. Easy mod and well worth the effort.
You find my posts and picutures  at the end of this  "Fridge running strangely" thread.
Perry

https://www.myhanse.com/fridge-running-strangely_topic13565_page1.html?KW=fridge




Edited by perry - 23 March 2023 at 20:30
Current Yacht Hanse 315 2007
Last Yacht Hanse 301 Round GB in 2017
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Martin&Rene View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Martin&Rene Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2023 at 15:52

Judging from some of the other positive comments whilst the fact is that not all the evaporator plate on you yacht is is cools. it is a possibility that the system needs re-gassing.

Looking at the broader picture of how to improve the performance of the fridge, there have been a number of articles on insulating fridges, so here are some links. 

This one describes the top-level job using expanding foam and has some other useful comments.

https://www.myhanse.com/reduce-compressor-running-time-with-up-to-50_topic5008_page4.html?KW=fridge


This one uses sleeping mat polystyrene foam

https://www.myhanse.com/topic12058_post99004.html#99004

 

I just glued in pieces of 25mm closed cell foam that the building trade used.  Also remember to put pipe insulating on the pipe from the compressor to the fridge.

 

I also used the same PIR foam underneath the bed bases, as seen in an article I wrote.

https://www.myhanse.com/minimising-condensation_topic12658_post104059.html?KW=insulation#104059

 

This link shows how I improved the air flow over the compressor cooling coils with a PC fan

https://www.myhanse.com/fridge-comprressor-cooling&KW=isotherm_topic7850_post61459.html#61459

   
Martin&Rene Hanse 341 Dipper Wheel steering, 3 cabin layout, normally based in Scotland
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