Ground Water Applications; Ground Water Freeze Protection Switch; Water Coil Maintenance - Econar GeoSource Ultra 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
'?lug,
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
liaes.
Make
sure
line
sizes are
large enough to supply the
required
flow
with
a
reasonable pressure drop (generally
l"
diameter
minimum).
Water discharge is
typically
made
to
a
drain field,
stream,
pond,
surface discharge,
tile line, or
storm sewer.
elmportant
-ensure
the discharge
line
has
a
pitch of
at
least three
inches
per
12 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.
VCAUTION
-
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. L,ow
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.
1.
Ground Water
Freeze
Protection
VCAUTION - Only specifically
ordered equipment
with
a
factory-installed
65 psig
low-pressure switch can
be
used
on ground water
applications.
(The
low-pressure
switch
on a ground loop
system
has a 50
psig
nominal
cutout
pressure.)
If
the water
supply
to
the
heat pump
were intemrpted
for
any reason, continued operation
of
the
compressor
would
cause
the water remaining
in
the
heat exchanger
to
freeze and
rupture the
heat exchanger
and
may
void
warranty.
2.
Water Coil Maintenance
Water
quality is
a major consideration
for
ground
water
systems. Problems
can occur
from
scaling, pafiicle
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
strainer.):
a.
Chlorine Cleaning
(Bacterial Growth)
1. Turn
off all
power
to
the
heat
pump during
this
procedure.
2.
Close the shut-off valves upstream
and downsffeam
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.
Stafi the pump
and circulate the solution through
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.
This procedure
can be repeated annually, semiarrnually,
or
as
often
as
it
takes
to
keep
bacteria
out
of
the
heat
exchanger,
or
when bacteria
appears
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 the heat
exchanger,
but
will
probably
need
to
be
repeated,
possibly
every
three
to five years. SContact
a
well driller in
your
area
for
more
information.
b.
Muratic Acid
Cleaning
(Dif{icult
Scaling and
Particle Buildup
Problems)
1. EWARNING
*
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. Turn off all
power
to
the
heat
pump during
this
procedure.
3.
Close the
shut-off
valves upstream
and
downstream
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 amowt
of
muratic
acid
to
create
a
final
concentration of
5Vo
mtrattc
acid.
9WARN[.{G -
Always
add
acid ro
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