WATER
HEATER
CONNECTIONS
WATER
HEATER
INSTALLATIONS
This engine is equipped
with
connections for the plumbing
of
engine coolant to heat an on-board water heater. The water
heater
should
be mounted in a convenient location either
in
a
high
or
low position
in
relation to the engine, so that the con-
necting hoses from the heater to the engine can run
in
a rea-
sonably direct line without any loops which might trap air.
Hoses
should
rise continuously from their low point at the
heater to the engine so that
air
will rise naturally from the
heater to the engine. If trapped air is able to rise to the heater,
then
an
air bleed petcock must be installed at the higher
fit-
ting on
the
heater for
bleeding
air while filling the system.
NOTE:
If
any
portion
of
the heating circuit rises above the
engines closed cooling system pressure cap, then a pressur-
ized (aluminum) remote expansion lank must be installed
in
the circuit to become the "highest point.
Tee
the remote expan-
sion tank into the heater circuit, choosing the higher
of
the
Mo
connections for the return.
Tee
at
the heater, and plumb a
single line up
to
the
tanks
location and the other back to the
engine's return. Instal/the remote expansion lank
in
a con-
venient location so the fresh water coolant level can easily
be
checked. The remote expansion lank will now serve as a
check and system fill point. The plastic coolant recovery lank
is
not used when the remote expansion lank kit is installed,
since this tank serves the same function.
->::,....
/.,
---y~
HEATER
ABOVE
THE
ENGINE
REMOTE
EXPANSION
'l:
TANK
j\
1°
. I
t
~,
WATER
HEATER
THERMOSTAT
HOUSING
25
The
pressure
cap
on the engine's manifold should be
installed after the engine's cooling system is filled with
coolant. Finish filling the cooling system from the remote
tank after the system
is
filled and is free
of
air and exhibits
good
coolant circulation. During
engine
operation, checking
the
engine's coolant should be
done
at the remote tank and
not at the
engine
manifold cap.
The
hose connection from the
heater to the remote expansion tank should be routed and
supported so
it
rises continuously from the heater to the tank,
enabling any air
in
the system
to
rise
up
to the tank and
out
of
the system.
NOTE:
Air
bleed petcocks are located on the engine's heat
exchanger and on the thermostat housing.
Open these pet-
cocks when filling the engine'sJresh water
S}'Slel7l
to
allmA'
air
in
the coolant circuil !O escape. Close lighl(V after al! the
air is removed.
~
THERMOSTAT
HOUSING
HEATER
BELOW
THE
ENGINE
WATER
HEATER
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