Ground Water Applications; Water Coil Maintenance - Econar GeoSource 2000 GW Series Installation And Operating Instructions Manual

elmportant
-
A
visual
flow
meter must
be installed to
allow visual inspection
of
the
flow to
determine when
maintenance
is
required.
(If
you can't
read
the flow,
cleaning
is
required.
See
Water
Coil
Maintenance
for
cleaning instructions.)
A
solenoid
control
valve must be installed
on
the water
discharge
side
of the heat pump
to
regulate
the flow
through
the unit. Wire the
solenoid
to
the
"Plug,
Accessory"
connector on the
controller. This valve
opens
when
the
unit
is
running and closes when the
unit
stops.
Schedule
40 PVC piping,
copper
tubing, polyethylene or
rubber hose can
be used
for
supply
and discharge water
lines.
Make
sure
line
sizes are
large enough
to
supply the
required
flow with a reasonable pressure drop
(generally
1" diameter
minimum).
Water discharge is
typically
made
to
a
drain
field,
sffeam,
pond,
surface
discharge,
tile line, or
storm sewer.
qlmportant
-ensure
the discharge
line has a
pitch
of
at
least
three
inches
per
L2 feet, has
a
minimum
2
feet
of
unobstructed
freefall
at the end
of
the
line,
and has at
least
100
feet
of grade sloping away
from
the
discharge outlet.
9CAUTION
-
A
drain
field
requires
soil conditions
and
adequate
sizing
to
ensure
rapid
percolation. Consult local
codes
and
ordinances
to
assure
compliance.
DO NOT
discharge water to
a
septic system.
VCAUTION
-
Never operate
with flow
rates less than
specified.
Low flow rates, or no
flow,
may cause
the
unit
to shut down on a pressure
lockout or may cause a freeze
rupture
of
the heat exchanger.
L.
Ground Water
Freeze
Proteetion
VCAUTION
- Only specifically ordered equipment
with
a
factory-installed
35 psig low-pressure switch can be
used
on ground water
applications.
(The
low-pressure
switch on a ground loop
system
has
a
10
psig
nominal
cutout pressure.)
If
the water supply
to
the
heat
pump
were interrupted
for
any reason,
continued operation
of
the
compressor
would
cause
the water
remailing in
the
heat exchanger
to
freeze and
rupture the heat exchanger
and
may
void warranQr.
2.
Water Coil Maintenance
Water
quality is
a major
consideration
for ground
water
systems.
Problems
can occur from scaling,
particle
buildup,
suspended
solids, corrosion,
pH
levels outside
the
7
-9
range,
biological growth, or
water
hardness
of
greater than 100-PPM.
If
poor water
quality is
known to
exist
in
your
area,
a cupro-nickel water
coil
may
be
required when
ordering the system; or installing a
ground
loop
system
may
be
the best
alternative.
Water coil
cleaning on ground water
systems
may be
necessary
on
a
regular basis. Depending
on the
specific water
quality
issue,
the water
coil
can
be
cleaned
by the
following
-)
methods (Note -
always remember to clean the
sfrainer.):
a.
Chlorine Cleaning
(Bacterial Growtfi)
1. Turn
off all
power
to
the
heat
pump during
this
procedure.
2.
Close the
shut-off valves upstream and downsfream
of
the heat exchanger.
3.
Connect
a
submersible
circulating pump
to
the
hose
bibs on
the
entering and
leaving water
sides
of
the heat
exchanger.
4.
Submerse the
pump in
a
five-gallon
pail of
water
with
enough
chlorine
bleach
to
kill
the bacteria. Suggested
mixture
is
1
part chlorine bleach to 4
parts water.
5.
Open the hose
bibs to
allow circulation of the solution.
6.
Start the
pump
and
circulate the solution
tlrough
the
heat exchanger
for
15
to
60
minutes.
The
solution
should change
color to indicate
the
chlorine
is killing
and
removing the
bacteria from the heat exchanger.
7.
Flush the used solution
by adding
a
fresh water supply
to
the
pail. Flush until
the
leaving water is clear.
8.
Repeat
this procedure
until the
solution runs
clear
through the
chlorine circulation process.
9.
Flush the entire heat
pump
system
with water.
This procedure can be repeated
annually, semiannually,
or
as
often as
it
takes
to
keep bacteria
out
of
the
heat
exchanger, or when bacteria appeils in
a
visual
flowmeter
to the
point
the
flow
cannot be read.
Another alternative
to
bacteria
problems
is
to
shock the
entire
well. Shocking the
well
may give longer term
relief
from
bacteria problems than cleaning ttre heat
exchanger,
but
will
probably need
to
be
repeated,
possibly
every
three
to five years.
EContact
a
well driller
in your
area
for more
information.
b.
Muratic Acid
Cleaning
(Difficult
Scaling and
Particle Buildup Problems)
1. 9WARNING
- Consult installer
because
of
the
dangerous
nature
of
acids.
Only
an experienced
and
trained
professional
should perform this
procedure'
(Note - CLR, Iron-Out
or
other de-scaling
products
may be
a
better alternative before using
Muratic Acid.)
2. Tum
off all
power
to
the
heat
pump during
this
procedure.
3.
Close the
shut-off valves upstream
and
downsffeam
of
the heat exchanger.
4.
Connect
a
submersible
circulating pump
to
the
hose
bibs on the
entering
and
leaving water
sides
of
the
heat
exchanger.
Note
-
these
are corrosive chemicals,
so
use a
disposable or a
suitable pump.
5.
Submerse the
pump in
a
five-gallon
pail of
water
with
a
small amount
of
muratic
acid
to
crcate
a
final
concentration
of
5Vo
murattc acid.
EWARNII{G - Always
add
acid to water;
never add
water
to
acid.
6.
Open the hose bibs to
allow circulation.
7.
Start the
pump
and
circulate the solution through
the
heat exchanger
for
about 5 minutes
until
there
are
no
longer any air bubbles.
7