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qcnr
Member Since: 23 Nov 2017
Location: Norway
Posts: 117
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I like to use my FBH before starting the engine here up north and tend to program it at set times. Now that it is getting warmer it doesn't always start and was wondering if there are any parameters that would override a programmed start up?
This is in a 2010 D4 programmed via the touch screen.
Even pressing manual heat doesn't necessarily start it.
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 25th Apr 2022 6:08 am |
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nigethecat
Member Since: 11 Sep 2016
Location: Marnoch
Posts: 4252
  
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The most basic parameters are that it has to be below 5 degrees (or thereabouts) and you need at least 1/4 of a tank of fuel...
Obviously if it's above 5 degrees then there is no need for the FBH to cut in... I want to see the sweets before I get into your windowless van... I'm not stupid!
Corris Grey D4 Commercial SE 2016
Zermatt Sliver 2007 D3 SE manual (gone)
Indus Silver D4 HSE 2015 (gone)
Bonatti Grey D3 HSE 2006 (gone)
White D3 S (LHD) 2007 (gone)
Firenze Red D4 HSE 2014 (gone)
Black RRS 3.6TDV8 2008 (gone)
Rusty Green Defender 110 1997 (gone)
Black FL2 HSE 2013 (gone)
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| 25th Apr 2022 7:35 am |
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Motolab
Member Since: 18 Oct 2019
Location: Sleen
Posts: 1820
  
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Quote: Obviously if it's above 5 degrees then there is no need for the FBH to cut in...
You can’t say it that way….
FBH term is an “layout” for a heater, as there also electric heaters and gas heaters…
As an auxiliary heater, there is indeed no need for it to work above 6 degrees celcius..
As a parking heater, it can be wanted/needed at any outside temperature, why not?
With a Altox remote system i can start my Webasto FBH in my D3 at any outside temperature, as long as the coolant temp is below approx 60 degrees celcius..
As i do not have a D4 i do not know what or if there are limits with the LR switching Best regards
Harold
Always looking for Pre '55's & Pre war British Motorcycles! knowing or having one for sale? PM please. I visit the UK 6 times a year
Ps. I edit my texts quite often, english is not my native language, so I will edit My “typo’s” etc. 
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| 25th Apr 2022 7:48 am |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10735
 
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I wasn't aware of any limits. Though it would be sensible if it didn't startup in summer!
Maybe some info in here:
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| 25th Apr 2022 11:51 am |
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qcnr
Member Since: 23 Nov 2017
Location: Norway
Posts: 117
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Well one of the good uses for it in summer is it still preheats the engine and if you set the heater controls to cold and your car has been standing in the sun, the heater will at least blow in ambient air when that temperature is reached. However this was on a different car and not integrated to the vehicles system.
I had a RRS with the simpler version (no timer) and could understand it not running above 5C or if the engine had a certain temp already. But if the heater can be programmed to start when you want, do the other parameters override the preprogramming?
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| 25th Apr 2022 12:39 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10735
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I think theD4 does have a summer cooling function now you mention it.
Maybe it requires enabling
In the video it started up at 9C
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| 25th Apr 2022 12:54 pm |
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alex_pescaru
Member Since: 19 Dec 2010
Location: RO
Posts: 270
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Different upper limits for different W-Bus host addresses (IDs).
The upper limit temperature when it's started by the car (engine) is 5 deg.
The upper limit temperature when it's started by diag. tools (ID 0x0F) is 10 deg. (or 15, don't remember now exactly...)
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| 25th Apr 2022 4:48 pm |
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kevofcov
Member Since: 06 Nov 2007
Location: Other end of M69
Posts: 571
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nigethecat wrote:
Obviously if it's above 5 degrees then there is no need for the FBH to cut in...
Not sure I agree. Preheating the engine is great for engine wear. Starting my engine having been pre warmed is a winner every time....
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| 22nd May 2022 6:54 pm |
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Motolab
Member Since: 18 Oct 2019
Location: Sleen
Posts: 1820
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Quote:Preheating the engine is great for engine wear
That is debatable tbh…
First, the heated coolant is mainly in the heads, only partially around the cylinders, but definitely NOT in the sump…. And lower engine crankcase
Second the main reason wear is bigger on “cold” starts, has less to do with temperature but more with oil pressure and oil not being where it should be, because it drained out of the bearing shells….
A warm upper part on an engine will not change that…
If you want to combat wear due to coldstarts, you need to find a way to prime the oil through all the bearings before you start the engine.. Best regards
Harold
Always looking for Pre '55's & Pre war British Motorcycles! knowing or having one for sale? PM please. I visit the UK 6 times a year
Ps. I edit my texts quite often, english is not my native language, so I will edit My “typo’s” etc.
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| 22nd May 2022 8:46 pm |
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