forward ventilator sucks out a i d f r o m the toilet compartment through a duct inside
the deck. A closed up, stationary Albin 25 can have an inside temperature 5 ° C
lower than outside on a hot summer day. Without this ventilation system the boat
would be like an oven. The deck has good insulation through its sandwich construc-
tion and the inside of the hull is insulated with a lining of plastic covered textile and
foam. This insulation and the ventilation system combine to keep the boat very
moisture free during normal conditions.
If an Eberspacher boat heater is added to the ventilation system it is possible to keep
the boat warm and dry even during very low temperature conditions. The Albin 25 is
planned for such an installation. The principle function of the heating system is shown
in fig. 24. In the completely enclosed combustion chamber of the heater, diesel oil is
burned. It
i s
pumped from the main fuel tank by an electric pump. The air for com-
bustion is taken from outside directly through the hull and the exhaust gases are let
out through the exhaust tube placed over the intake for combustion air. Fig. 25. This
makes the condition for even burning more certain. A wind blowing against the ex-
haust opening gives the same pressure at intake and exhaust. A fan in the heater
sucks fresh air from the space with the cold wall and the air is heated when
it
passes
around the combustion chamber. The heated air is lead through a duct to a dividing
valve on the bulkhead by the control position. This valve can control the passage of
hot air to one or both cabins.
Fig.
24.
The ventilating and heating systems.
The heater is started with a switch on the bulkhead at the far side o f the toilet. Near
this switch is a thermostat where the temperature for the forecabin can b e regulated.
The temperature in the aft cabin is dependent upon how the dividing valve is placed.
To hold the inside temperature 10-15°C higher than the outside temperature the
thermostat normally has the heater going about 25% o f the time, that is 15 minutes
out of each hour. With the heater running continuously fuel consumption is about
C.3 litres an hour and with the thermostat working about 0.1 litre per hour. A t the
start the heater requires 18 amperes starting current for
30 secs., after which the
17
www.jonesboatyard.co.uk
