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Lazzara 84 ER blower system

Discussion in 'Lazzara Yacht' started by Pascal, Aug 14, 2016.

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  1. Pascal

    Pascal Senior Member

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    trying to see what I may be missing here. Only been running the boat for a couple weeks and going thru all the systems. So far so good but...

    The boat (2009) has a forced blower system which pulls outside air to feed the engine room using a pressure sensor to vary the blower speed. System works fine (after I cleared the tube sensing outside pressure )

    What I don't get is how to cool the ER after a run without having to go down and switch the blowers to manual but also without having to keep the ER and transom door cracked open. It seems the air output vents are too small (yes the dampers are fully opened) so you have to vent thru the door

    Has anybody have this issue before ? Doesn't make sense
  2. Capt J

    Capt J Senior Member

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    It probably is the only way to cool off the engine room. Everything Lazzara did was not the smartest. On the 68' MY in the mid 2000's and the 76' built late 90's and early 2000s, the only way to enter the engine room was from a transom mounted door which had a 14" deep swim platform and was 10-12" above the waterline. So in a flooding situation, no way to enter the engine room without completely flooding it.
  3. Pascal

    Pascal Senior Member

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    I ve seen many boats that only have access to the ER thru the transom. The 84 has an emergency hatch on the aft deck but I m not sure whether it can be open from the outside.

    I have spent the last two weeks crawling, checking, discovering and testing whenever we didn't go out and so far I found very few silly things.

    At least the engine room is a pleasure to work in especially with the blowers on manual and the door open I like having the air intakes above deck and not on the hull side as it reduces the amount of salt that gets in.
  4. amgscrap

    amgscrap New Member

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    boca raton
    I have a newer and different model Lazzara. However, there is a manual switch at the helm to turn the blowers on. Perhaps one can be installed on your boat. On mine I turn the blowers on right before I turn the generator or engines on and leave it on for about an hour after I finish for the day. If your running the engines with the doors closed then there is enough volume of circulation or it would, I think, affect the running of the engines.
  5. Pascal

    Pascal Senior Member

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    On the 84 the helm switch turns them on auto if they re not on from the ER. I usually go down to the ER after a run anyway so that no problem

    There are two oval openings with louvers on each side of the hull for air to be pushed out but they re a smaller than the intakes so air flow isnt as big as it should be
  6. Mark Woglom

    Mark Woglom Senior Member

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    Live in Gilford NH. Boat in Sarasota winters, New
    On the 68 I used to own, it worked as follows:

    1. In automatic mode, the fan speed modulates based upon the air pressure in the engine room. As the motors speed up, they require more combustion air, and the fans modulate to keep the proper amount of positive pressure in the engine room. This is how the fans should be operated when running the boat.
    2. In manual mode, the fan speed is regulated by the operator. This allows you to have a large variation of airflow, if you are working in the engine room.

    The fans can handle a LOT more air than is required for combustion, and a lot more air than you would want to have as an intake open to the exterior. Yes, you have to open a hatch (there were 2 on my 68) to get the benefit of full airflow, but if you are working in that engine room while the engines are still warm, you will appreciate the extra airflow .... those fans move a massive amount of air.

    The 68 had an emergency hatch that was part of the port side cockpit bulkhead .... Plenty big, and as easy to operate as opening a cabinet door. After I shut the boat down, I would simply open that hatch. The fans would still be in automatic mode, and the pressure sensor would sense the drop in air pressure. Instantly, I was cooling the engine room with a huge amount of airflow. (My wife could even dry her hair with all the hot air coming out of the hatch) When I got around to going in the engine room (through the transom hatch) the engine room would be a bit cooler.

    Even with the engines cold, on a hot summer day, you will appreciate the huge amount of airflow through those fans, if you are working in the engine room. Yes, you have to open a hatch to get that airflow, but you can't have airflow without an opening to the exterior, and you wouldn't want that big of an opening to the exterior, in an emergency/storm situation.

    In my opinion, an incredibly robust system, and one of the nicer features of the boat.
  7. Pascal

    Pascal Senior Member

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    I agree, this engine room is a pleasure to work in and even now, in th middle of summer in Florida, with the blowers running at 50 to 60% and the transom door open working in there is very comfortable. Those variable speed blowers will send a massive amount of air out the door.
  8. Pascal

    Pascal Senior Member

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    This 2009 84' has a deck key for the ER escape hatch so it can also be opened from the outside.

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