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Westabo heating

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sailkoop View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sailkoop Quote  Post ReplyReply Direct Link To This Post Posted: 02 August 2017 at 16:41
Hi, I only can say that the original hose diameter together with the length to the Owner Cabin was Bit sh*t!! I installed a 90mm diameter hose including Isolation. My exhaust is also isolated! No trouble with the heater since then, and everytime warm inside, when it was cold outside👌
best regards

Bjoern

http://www.sy-serafina.de
Hanse 470e #165

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JonB View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JonB Quote  Post ReplyReply Direct Link To This Post Posted: 02 August 2017 at 18:14
Hi Bjoern,

I've installed the 90mm duct all the way to the Master Cabin now and it is all covered in the thermal sock, the only section under the saloon heads, that I can't get to hasn't but I'm happy if the heads get a bit warmer as this doubles as the wet room for coats & salopettes.  Although talking to the specialist guy he's suggested a method of removing this section too, so I'll look at it and decide whether to replace or not.

The constantly open outlet that was in the saloon is now the larger one in the Master Cabin, so I can shut the saloon off at night and send, in theory, warm air on to the front in the morning.

However, despite finishing the insulated ducting off shortly, do I buy a new unit to replace my unworkable one, or, as I've been without it working for 6 years, just leave it for any subsequent owner to fit at a later date.
Jon B
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http://www.norse-king.blogspot.co.uk
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JonB Quote  Post ReplyReply Direct Link To This Post Posted: 06 September 2017 at 07:59
Well I've listened to the experts & my ST5000 will never run as intended, also the ducting has been installed by boat builders not heating Engineers, so I've no chance.

Before I think about whether to sort this out once and for all, or just sort out the ducting properly and any new potential owners, should we God forbid, come to sell our pride & joy, can install a new unit for themselves. I'm going to test my original plan & fit an in line variable speed fan under the chart table & see if my theory works. I have also moved the heat sensor that causes most of the ST issues away from the main body.

It's all reconnected, the fans electrics have been wired in temporarily for now & I'll soon fire it up and see how long it or even if it works !
Jon B
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http://www.norse-king.blogspot.co.uk
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JonB Quote  Post ReplyReply Direct Link To This Post Posted: 10 November 2017 at 08:50
It's not been the greatest year for us with regards to sailing as our house, a similar age to Osborne House here on the Island, has taken most if not all of our attention. Yes we managed to use 'Thor Junior' our cruising Code 0 on one occasion and were very impressed with the performance gained. Other than that the longest time we've spent on board this year has been in our local marina for almost a month where we've visited him daily whilst our kitchen was being ripped out. More collected together rather than ripped out such was its state, ripped implies a certain amount of resistance.

I did run the Webasto with the electric fan I fitted, but alas despite removing the heat sensor from the Airtop to hang off the side, the same issue ensued, flame out failure and four flashes of the warning light. NK will be back on the hard from December and I'll complete what I started with regards to the ducting. The purchase and fitting of a new Webasto can wait.

Clearly anyone who has a single Airtop ST5000 to serve their 470 should be having similar issues.
Jon B
470e
http://www.norse-king.blogspot.co.uk
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sailkoop View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sailkoop Quote  Post ReplyReply Direct Link To This Post Posted: 10 November 2017 at 09:32
Hi Jon,
bad to here that the Season was less sailing...
I am one of the Owners who have a single Webasto installed. I have no issue like you and my WEebasto is running without any Problem. I still believe that you don't have a 90mm Hose from the beginning to the end. I guess there is a Reduction in the Diameter in shorter distance to the Heater which brings the Problems to you....
Only my Opinion....
best regards

Bjoern

http://www.sy-serafina.de
Hanse 470e #165

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JonB View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JonB Quote  Post ReplyReply Direct Link To This Post Posted: 10 November 2017 at 11:07
Hi Bjoern,

Is yours the Airtop ST5000, I can't remember? Does it have the pair of yellow wires heading to a sensor that fits on top of the fins?

According to the expert that makes a living fitting out Gin palaces and other extremely expensive yachts as well as our more humble beasts and as an Engineer I understand where he's coming from.  If you look at any warehouse type sales outlet, in the roof is the heating ducting you can see that it diminishes as it reaches the end.  The mathematics behind it supports it when taking obstructions and reductions into account, the airflow in the smaller diameter speeds up, but it does require suitably sized fans to create the pressure within the system to enable that.

As I know you will have read, but save others looking back, my first discovery was that the inner liner of the 90mm where it left the unit had unpeeled, causing a Tagliatelle type ball clearly blocking the duct. On removing the benching behind the table to enable me to get at reduced 60mm ducting beneath, I discovered that presumably during manufacture, someone's size 9 (42eur), trod on it causing a further restriction.  I have since installed insulated 90mm all the way to the master cabin (except under the saloon heads, where it remains uninsulated).

However, despite the increase in duct size the inclusion of a fan under the chart table ought to increase ambient pressure and produce more than hope out of the master cabin outlet.  The problem is inherent within the unit itself and it shuts down as the software spirals itself into submission and that's from the expert too.

Ours is a 'nice to have' in our climate I can see yours as being for more of a 'must have' and as such having owned the boat for what I think is seven years, I'm only really getting to grips with the issues.


Jon B
470e
http://www.norse-king.blogspot.co.uk
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