Desuperheater (Optional) - Econar GeoSurce Vara 2 Plus GV Series Lnstallation And Operating Lnstructions

XVI.
DESUPERHEATER
(OPTIONAL)
A
GeoSource
Yara
2
Plus'*
heat
pump equipped
with
a
desuperheater can
provide
supplemental heating
of
a
home's domestic hot
water. This
is done
by stripping
heat
from the
superheated
gas leaving the compressor and
transferring
it to
a
hot water
tank. A
desuperheater
pump,
manufactured
into
the
unit, circulates water
from
the
domestic hot water tank, heats
it
using
a
double walled
water-to-refrigerant heat
exchanger,
and
returns
it
to the
tank.
The
desuperheater
provides supplemental heating
because
it only
heats
water when
the
compressor is
already
running to
heat
or cool the conditioned
space.
Insulated copper tubing must
be used to
run
from
the hot
water tank to
the desuperheater
connections on the
left
side
of
the
unit.
This
tubing can be connected
to
the
hot
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.
METHOD
2
Taking hot
water
from
the bottom
drain
and
returning
it
to
the
cold water supply line (See Figure
7).
Tttrs method
maintains
the same
comfort
and
efficiency
levels
but
increases
installation time
and
costs. This method
requires
a
check valve
in
the
retum 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. A
spring-type check valve
with
a
pressure
rating
of
1/2
psi or
less is
recommended.
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 tuming
the brass
collar. Let
water
drip
out
of
the
housing
until
flow
is established, and
re-tighten
the
brass
collar.
Using
l/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 vent
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-l/2
inches above the
horizontal
pipe.
Shutoffvalves allow
access
to
the
desuperheater
plumbing without
draining
the
hot water
tank. Keep valves open when pump
is running.
VC.LUffON:
Running
the desuperheater
pump without
water
flow
will
damage the
pump.
Poor water
quality
may restrict
the
effectiveness of using
the desuperheater tee by
plugging
the entrance
with
scale
or buildup from
the
bottom of
the
tank,
restricting
water
flow.
Desuperheater
maintenance includes
periodically
opening the
drain on
the
hot water tank to remove
deposits.
Ifhard
water, scale, or
buildup
causes
regular
problems in
hot water tanks
in your
area,
it
may result in
a
loss
ofdesuperheater effectiveness. This may require
periodic
cleaning
with Iron Out or similar
products.
The
desuperheater's
high temperature cutout switch
is
located on
the
return
line from
the water
heater.
The
switch is
wired in
series
with
the desuperheater
pump to
disable
the
pump
from circulating
at
ertering
water
temperature above 1401F.
Ifthe
desuperheater
causes
tank temperatures to become
uncomfortably hot, this
temperature switch
can be
moved to
the
leaving water
line
which
will
reduce the
tank maximum temperatures
10oF
to
15iF.
Do not remove
the
high temperature switch or
tank temperatures could become
dangerously high.
A
fuse is
attached to
the
fuseholder and must
be
inserted
in
the fuseholder
after
the desuperheater is
operational.
Do not insert fuse
until
water
flow
is
available or
the
pump may
be
damaged. Remove
the
fuse
to disable the
pump
if
the desuperheater is not
in
operation.
T9