Operating instructions

Furnace exhaust is just
forward of midships to
port.
A fan switch.
The furnace is controlled by a master switch on the port side of
the lower helm cabinet, and by thermostats in each area.
The master switch has three settings:
Off The heating system is “all off”
System Heat The Diesel Furnace will supply heat if
called for by any thermostat
Engine Heat The port engine (if running) will supply
heat if called for by any thermostat
Select the desired master switch setting and then set the desired
temperature on the thermostats.
When the thermostat calls for heat, and the switch is in the
“System Heat” position, the first time the furnace runs after
the master switch is turned on, it will take a few minutes while
the furnace starts, and then brings the circulating water to the
needed temperature before the fans start heating the boat:
Be patient! (The furnace has a built-in computer controlling
its functions.) The furnace will then supply heat to the boat
until the thermostat senses it is warm enough, then the
computer will shut off the fans while the furnace goes through
a “cool-down” cycle. You need not do anything but set a
thermostat!
In the “Engine Heat” position, the heat will come on more quickly if the engines have
been running.
To control the balance of heat between the boat’s areas, if the thermostat settings are
not sufficient, you can use the fan switches in each area to adjust the heat flow to “low” or
“high”.
Do not leave the fan switches “off”, lest you have the furnace running with no
way to distribute its heat!
As you can see, this furnace system is very flexible and a great
addition to the boat! As long as the batteries can support the modest DC
power requirement of the fans and furnace blower, you will have plenty of
quiet heat. In fact, this use of the house batteries’ energy for air circulation
is a good reason to limit use of the furnace to times when passengers are
awake, unless the boat has shore power available.
CAUTION: The furnace exhaust is on the port side of the
boat and is very hot! Do not put fenders in front of it, and
do not let the dinghy or any other boat be alongside
where it might be burned by the hot gas!
Furnace Problems
You should not have problems with the furnace; if you do, contact
NW Explorations.
Note the location of the furnace exhaust on the port side of the
boat! Care should be taken not to block this outlet with
Furnace master switch.
Section 4M: Furnace & Air Conditioning 4.31