Vetus VENT178B2 Manuel D'installation page 4

ENGLISH
1 Introduction
A VETUS Extractor Fan type VENT178B is used for ventilating the en-
gine room.
To prevent personal injury, always disconnect electrical connec-
tions during installation and maintenance.
Never use the fan in a room if the ambient temperature exceeds
70 degrees C (158 degrees F).
2 Operating instructions
The fan should be switched on for at least 4 minutes and the room
checked for the presence of any vapours before the ship's engine is
started.
Never switch on the fan when refuelling.
3 Installation examples
The fan can be fitted in a number of different situations.
Example 1
In this situation, the ship's engine gets its inlet air separately (via a
grille with plenum chamber). The fan is then used to extract hot air
from the engine room. this can be done while the engine is running
or stopped. See drawing 1, page 10.
Example 2
Here, the ship's engine does NOT obtain its inlet air separately. The
engine room can only be ventilated by the fan when the engine is
stopped. See drawing 2, page 10.
Always ensure that the ventilation openings are large enough, and
that the fan(s) has sufficient capacity. Improperly positioned ventila-
tion openings and insufficient capacity fans can lead to poor func-
tioning of the ship's engine. Always read the engine supplier's instal-
lation instructions.
N.B.: With a DIESEL engine, the air should preferably enter the engine
room low down, and be extracted as high up as possible.
With a PETROL engine, the air should enter from high up in the
engine room, and be extracted as low down as possible, where
it is most likely that vapour will collect. This point should always
be below the top of the engine foundation. However, the duct
opening should not be so low that there is a risk of bilge water
being sucked into the fan.
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4 Installation
The fan should be positioned where water (sea water) cannot dam-
age the fan (electric motor).
• Fit the fan on a bulkhead or floor, the mounting can be either ho-
rizontal or vertical. The bulkhead or floor should be flat where the
fan is fitted.
• Drill or saw a 182 mm (7 3/16") diameter hole in the floor or bulk-
head. Using the fan as a guide, drill the holes for its fitting screws
or bolts.
• Fit the ventilator with 4 stainless steel bolts or screws, size M6 or
1/4". Tighten up the screws evenly, but not so tight that they split
the mounting flange.
Ventilation Duct
Use ventilation duct with an internal diameter of 178 mm (7"). This
ducting must conform to the following specifications:
- Smooth on the inside
- Resistant to a temperature of 70 degrees C
- Resistant to oil water and fuel
- Resistant to under and over-pressure
Keep the ventilation duct as short as possible, with as few bends as
possible and keep the bend radius as large as possible.
Fit the duct with a rotating motion to the duct connection. Fix the
ventilation duct with 2 stainless steel clamps per connection. A ridge
on the duct connector holds the duct in place and stops the duct
slipping off after fitting.
Fit a grille over the extractor opening when the fan does not
have a ventilation duct. This will prevent touching the revolving
fan blades.
Electrical Connection
Check that the ship's voltage is the same as the voltage stated on the
fan (12 or 24 Volt).
Connect the fan as shown in the wiring diagram. Red is + (positive),
black is - (negative). Fit an 8 Amp fuse (for 12 Volt) or 4 Amp (for 24
Volt) in the + wire. Extend the connector wires if required. The mini-
mum core wire cross- section is 1.5 mm
sistant to more than 70 degrees C. Use insulated cable shoes. A ther-
mostat (5) can also be included in series with the switch in the circuit.
5 Technical Data
Motor : 12 V or 24 V direct current
RPM : 4,000 RPM, nominal
Current consumption : 6 Amp for 12 V, 3 Amp for 24 V
Capacity : Max. 12.2 m
Fan housing : NAVIDURIN®
Fan blade : Polypropylene plastic, 6.5" diameter
Duct Connector : 178 mm (7") diameter
Weight : 1.9 kg (4.2 lbs)
Max. ambient temp. : 70 degrees C (158 degrees F)
s
afety
2 , the insulation must be re-
3 /min (431 CFM)
Extractor fan type VENT 178B