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VCAUUON
-
nunning
the desuperheater
pump
without
water
flow
will
damage the
pump.
A
fuse is attached to
the fuseholder
and must
be
inserted
in
the fuseholder
after
the desuperheater
is
operational.
Important
-
Do not
insert the fuse
until
water
flow
is
available, or the pump may be
damaged.
Remove
the
fuse
to disable
the
pump
if
the desuperheater
isn't
in
operation.
All
air
must
be
purged
from
the
desuperheater
plumbing
before
the
pump
is
engaged.
To
purge small
amounts
of
air
from
the
lines, loosen the
desuperheater
pump
from
its
housing
by turning
the brass
collar.
Let
water
drip
out
of
the housing
until
flow is
established,
and re-tighten
the
brass
collar.
Using
1/2-inch
copper
tubing
from
the
tank
to
the desuperheater
inlet
is
recommended
to
keep water
velocities
high, avoiding
air pockets
at the
pump
inlet. An
air
venl
in
the
inlet line
can
also
help
systems
where air is
a
problem.
If
one
is
used
(we
recommend
a
Watts
Regulator brand
FV-4
or
Spirovent)
mount
it
near
the
desuperheater
inlet
roughly
2-ll2
inches
above
the
horizontal
pipe. Shutoff valves allow
access
to
the
desuperheater
plumbing without draining the
hot
water
tank. Keep valves open when pump
is
running.
Desuperheater maintenance includes
periodically
opening
the drain on
the
hot water tank to remove
deposits.
If
hard
water,
scale,
or buildup
causes
regular problems
in
water
tanks
in
your
area,
it
may result
in
a
loss
of
desuperheater
effectiveness.
This may require periodic
cleaning with
Iron
Out
or similar
products.
clmportant
-
Insulated copper
tubing must
be used
to
run
from
the
water
tank to
the
desuperheater
connections
on the
side
of
the
unit.
The
built-in
desuperheater
pump can provide the
proper
flow to
the
desuperheater
if
the
total
equivalent
length
of
straight pipe and connections is kept
to
a
maximum
of
90
feet
of ll2-tnch
type
L
copper
tubing (or
a
combination
of
approximately
60 feet
with typical
elbows and fittings).
This tubing
can
be
connected
to
the
water
tank
in
two
ways:
METHOD
1
Using
a
desuperheater
tee
installed
in
the
drain
at
the
bottom
of
the
water
heater
(See
Figure
6.).
This
is
the
preferred method
for
ease
of
installation, comfort
and
efficiency. The
tee eliminates
the
need
to
tap
into
the
domestic
hot
water
lines
and eliminates household water
supply
temperature
variations
that could occur
from
connecting
to
the
hot
water pipes. Poor water
quality
may
restrict
the
effectiveness
of
the
desuperheater
tee
by
plugging
it
with
scale
or buildup
from
the
bottom
of
the
tank,
restricting
water
flow.
METHOD
2
Taking
y,ater
from
the bottom
drain
and
retuming
it
to
the
cold water suppb line
(See
Figure
7).
This
method
maintains
the
same
comfort and efficiency levels
but
increases
installation
time
and cost.
elmportant
-
This
method requires
a
check valve
in
the
return
line to
the
cold
water supply
to
prevent water
from
flowing
backwards through
the
desuperheater
when
the
tank
is
filling.
Water passing through
the
pump
backwards
damages
the rotor's
bearing,
which
reduces
pump
life
and
causes
noise problems
in
the
pump.
Note
-
A
spring-type
check
valve
with
a
pressure-drop
rating
of
l/2
psig
or
less is
recommended.
l4
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