Re: [Amel Yacht Owners] Engine room temperature and cooling


amelforme
 

Thanks for this information Alexandre. Hmmmmm. Back in the mid 1990’s, I had a SM 53 demonstrator that I could have sworn today that the blower ran off the 24 volt alternator. I am far from salt water today but when I get back to Fort Lauderdale next week I will check out an early/pre Millennium boat as well as a 2003 boat and see what is what. Anyone with a pre 1999 Super Maramu reading this, does your fan come on when you energize the start circuit or only after the engine starts and the alternator is turning? Perhaps this evolved over the years like many other things.

 

Joel

 

From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Thursday, April 28, 2016 8:07 AM
To: amelyachtowners@...
Subject: Re: [Amel Yacht Owners] Engine room temperature and cooling

 

 

Good morning Joel,

Thanks for your reply, actually this is from the 12 Volt alternateur it runs off.

My question is why the 24 volt Fans are connected to a 12 Volt circuit?
The manual says “both 24 V devices work intentionally on 12 V deliver by the main engine alternator” but does not explain why.
http://nikimat.com/engine_room_fans/engine_room_fan_15.jpg

To make sure it was the fan being defective, I started the Volvo and measured 13 volt (on the wires going to the fan).
Later I also connected directly on 24 volt and it did not work. Will get replacement once I am in Puerto Rico in 2 or 3 weeks.

Removing it, yesterday I was the manufacturer date (1999) so quite impressed it last 16 years…
I remember changing the intake one 3 years ago

Thanks again!
Sincerely, Alexandre

--------------------------------------------
On Wed, 4/27/16, Joel Potter jfpottercys@... [amelyachtowners] <amelyachtowners@...> wrote:

Subject: Re: [Amel Yacht Owners] Engine room temperature and cooling
To: "amelyachtowners@..." <amelyachtowners@...>
Date: Wednesday, April 27, 2016, 7:01 PM


 









The engine room fan that operates when the
propulsion diesel is running runs off the 24 volt
alternator. Fire up your Yanmar and check the voltage then.
It has been my experience that the 24 volt DC extractor
fails well before the 220 volt extractor that is run from
the Onan when it is producing 220 volts. Non scientific
opinion but pretty much proven by my
experiences.
Hope your
extractor fan fires up on 24 volts!

Joel THE EXPERIENCED AMEL
GUY954-812-2485
On Apr 27,
2016, at 2:50 PM, Alexandre Uster von Baar uster@...
[amelyachtowners] <amelyachtowners@...>
wrote:
















 






Update:



Looking at the owner manual, I just saw the engine, in
addition to the intake fan, has also an extraction fan FASCO
24 Volt 2807-513-122 --- 93004-2815

http://nikimat.com/engine_room_fans.html



Engine on, I noted it was not working and likely the cause
of the warmer engine room.



With a Volt Meter I checked current was going to it and it
did: measured 13 Volt.

It seems normal as the owner manual says so…



Does someone know why this “24 Volt” FASCO 2807-513-122
--- 93004-2815 is connected to a 12 volt connection?



Olivier?

Joel?

Bill? Anyone?



Sincerely, Alexandre

SM2K #289 NIKIMAT

Private Slip, Marina Puerto Bahia, Samana, Dominican
Republic



--------------------------------------------

On Wed, 4/27/16, Alexandre Uster von Baar <uster@...>
wrote:



Subject: [Amel Yacht Owners] Engine room temperature and
cooling

To: amelyachtowners@...

Date: Wednesday, April 27, 2016, 10:54 AM





Good morning,



May be I am a control freak, but when using the engine
or

genset I monitor the temperature of the engine
compartment

via a wireless temperature sensor. 



I rarely use the engine for more than an hour at the
time

(mostly to leave and come back to a marina), but in a
few

occasions had to motor for 10 or more hours.

The temperature in the engine room, will gradually
increase;

when it reaches 47*C I open the engine hatch (sea
condition

permitting obviously) for 1/2 hour to cool it down to
45*C

and so on. 

“My” reason to do this is because of component from
the

generator melting at 50*C. 



Note:  the “suction” (intake) 24 Volt Jabsco

35440-0010 250 CFM Blower Fan is working (starts when
engine

is ON). 



Is there may be an air intake our outtake that could be

partially blocked? 

Is there another fan I am forgetting about? 





Other note: when using the Generator, it rarely goes
over

46*C after 2.5 hour use (its fan is also working).



Sincerely, Alexandre

SM2K #289 NIKIMAT

Private Slip, Marina Puerto Bahia, Samana, Dominican

Republic
























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