Installation manual
WATER
HEATER
WATER
HEATER
INSTALLATIONS
These
engines
are
equipped
with
connections
for
the
plumbing
of
engine
coolant to
transfer
heat
to
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
connecting
hoses
from
the
heater
to
the
engine
can
run in a
reasonably
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
fitting
on the heater for
bleeding
air
while
filling
the
system.
NOTE:
Ifany portion
of
the
heating circuit
rises
above
the
engines
own
pressure
cap,
then
a pressurized
(aluminum)
remote
expansion
tank
(Kit
#024177)
must
be
installed
in
the
circuit
to
become
the
highest
point.
Tee
the
remote
expansion
tank
into
the
heater
circuit,
choosing
the
higher
of
the
two
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.
Install
the
remote
expansion
tank
in
a
convenient location
so
the
coolant level
can
easily
be
checked.
The
remote
expansion
tank
will
now
serve
as
a
check
and
system fill
point.
The plastic cooklnt recovery tank
is
not used
when the remote expansion tank
kit
is
installed, since
this
tank
serves
the same function.
Rel1W1!e
and
store
the
plastic.
recovery
tank
if
it
has
been
already
installed.
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
cOl)tinuously
from
the heater to the tank,
enabling
any
air in
the
system
to
rise
up
to
the
tank and out
of
the
system.
NOTE:
An air bleed petcock is located
on
the
engine
~
heat
exchanger.
Open
this
petcock
when
filling
the
engine's
coolant
system
to
allow
air
in
the
exchanger
to
escape.
Close
tightly after all
the
air
is
removed.
HOT
WATER
CONNECTIONS
.
'~""'ml"
THIS
HOSE
AND
CONNECT
THE
1WO
WATER
HEATER
HOSES
TO
THESE
mT/Ntis
~
WESTERBEKE
engines & Generators
22