Mainship 40 Trawler Single, Operator'S Manual

Page: 83 / 170

Mainship 40 Trawler Single & Twin • DC Electric Systems
7.7
CAUTION
! !
Fuel fumes in the engine compartment can explode.
Before working on electrical wiring ventilate engine room
and disconnect battery cables to prevent sparks.
There is an exhaust blower installed in the head, con-
trolled by a switch in the head.
The engine room blower is an exhaust fan which will
remove any exhaust fumes from the engine room, as
well as removing heated air.
The blower in the lazarette area, or generator space is a
supply fan. It supplies fresh air to the generator (option).
This blower fan is specific to the generator and will only
be installed if the generator option is ordered.
7.2.12 Fire Extinguishing Systems
Another component that is specific to the generator is
the fire extinguisher in the lazarette area. If your boat
does not have the generator option then this system is
not installed.
In the engine room there is another fire extinguishing
bottle installed. This system is DC powered, with the
relay, or “module” and the alarm at the helm station.
When a fire is detected on your boat, the alarm will sound
and set off the Halon bottles. This relay will shut down
the engines, the blowers, and the generator. To reset the
system, activate the reset switch on the monitor at the
helm. See fig. 7.11
Figure 7.11 Fire Alarm Monitor
7.2.13 Shower Sump
The shower sump is part of the Sanitary Systems and
more information about the Shower Sump can be found
in that section, however the breaker control for the show-
your safety.
The horns are DC powered and the controls are located
at the helm.
7.2.10 Bilge Pump Systems
The Mainship 40 Trawler is equipped with 3 bilge pumps
and one emergency bilge pump. For locations of the bilge
pump systems consult your Mechanical Arrangement
Drawing or the Sanitary Systems Drawing.
The Bilge Pump System consists of a pump and a float
switch. When the water level rises far enough to activate
the float switch this activates the pump which lowers the
water level down to a point that the float switch stops the
power. Fig. 7.10 shows you the typical wiring.
Figure 7.10 Bilge Pump System
7.2.11 Ventilation
Ventilation is a very important issue with your boat, with
the potential for carbon monoxide buildup (see Boating
Safety Section) along with the simple comfort of fresh
air or air conditioning, ventilation is a standard that is a
necessity.
On your Mainship 40 Trawler there are essentially three
types of ventilation, the air conditioning system (AC
System), the exhaust or blowers, and the Bomar hatches,
which supply you with fresh air when opened. Since the
air conditioning system is AC powered (see AC Electric
Section) and the hatches require no power we will detail
the blowers (or exhaust fans), and their function here.
For blower location consult your Mechanical Arrangement
Illustration in the Boating Safety Section, or the Ventilation
Illustration in the same section.
Ba
C