Econar GeoSurce Vara 2 Plus GV Series Lnstallation And Operating Lnstructions page 10

water.
Under normal conditions, there should
be
a
temperature difference ofabout
10-15 degrees
between
the supply
side and discharge side.
Ifthe
temperature difference
is
8 degrees or
less,
consideration should
then be
given to cleaning
the
water coil
heat exchanger.
tr. ff
cleaning of
the
water coil
is indicated,
please
carefully
follow
the steps listed below to atllize
the freeze
cleaning method.
1.
Turn off
the heat pump
and
its
water supply.
2.
Open
a
plumbing
connection on
the water supply
side,
if possible,
to break
the system vacuum
and
a1low easier drainage
ofthe
system and water coil.
3.
Drain
the
water out of
the system and
water
coil
via
the
boiler
drains
on the entering
and
leaving
water lines.
EWARNING!!
9
FAILURE
TO COMPLETELY
DRAINTHE
WATER COIL HEAT EXCHANGER
COULD POSSIBLY RESULT
IN A
FREEZE
RUPTURE!
4.
Set the thermostat
to "Heat" to
start the heat pump
in
the heating mode
and
quickly
freeze the
coil.
5.
Allow
the heat
pump
to
run until it
automatically
shuts
offon
low
pressure and then
turn
the
thermostat to
the
"Offl'position.
6.
Recap the water drains
and tighten
any
plumbing
connections that may
have been loosened.
7.
Ifso
equipped,
open the fleld installed drain cock
on the water discharge
side
of
the heat
pump,
and
install
a short
piece of
rubber
hose to
allow
drainage into
a
drain or bucket. A
drain cock
on
the discharge
side
allows
the water
flow
to bypass
the solenoid valve,
flow
valve,
flow
meter,
or
any
other item that may
be clogged by mineral debris.
Drainage to
a
bucket
helps
prevent
the
clogging
of
drains
and
allows you to visually
determine the
effectiveness of
the
procedure.
8.
Turn
on the
water supply to
the heat
pump in
order
to
start the process of flushing
any
mineral debris
from
the
unit.
9.
Set
the thermostat to
"Cool"
and start the heat
pump in
the
cooling
mode to
quickly
thaw out
the
water coil.
10. Run the heat
pump
until
t}le
water coil
is
completely thawed out
and any loosened scale,
mineral
deposits, or other debris buildup
is
flushed
completely
from
the
water
coil.
Allow
at least
5
minutes of operation to
ensure
that
the water
coil
is thoroughly
thawed
out.
I
1.
If
the
water
still
contains mineral debris,
and
if
the
flow
through
the
unit did not improve
along
with
an
increase
in
the temperature difference between
the water supply
and discharge, repeat the entire
procedure listed
above.
12.
Reset the heat pump for
normal operation.
b.
Chlorine
Cleaning
@acterial Growth)
1.
Turn
the
thermostat to the
"Off,
position.
2.
Connect
a
submersible
circulating pump to
the
hose bibs on
the entering
and
leaving water
sides
of
the heat exchangers.
3.
Submerse the
pump in
a
five-gallon pail of
water
and chlorine bleach mixture.
The chlorine should
be strong enough to
kill
the
bacteria.
Suggested
initial
mixture is
I
part chlorine bleach to
4 parts
water.
4.
Close
the shut
off
valves upstream
and
downstream
of
the heat exchanger.
5.
Open the hose bibs to allow circulation of
the
bleach solution.
6.
Start the pump
and
circulate
the solution through
the heat exchanger
for
15
minutes to
one hour.
The solution should
change color
to indicate
the
chlorine is killing
the bacreria
and removing
it
from
the heat exchanger.
7.
Flush
the used solution down
a
drain 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 ofthe
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
your
entire
well.
Shocking
your well
may give longer term
relieffrom
bacteria problems
than cleaning your
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.
c.
Miratic
Acid
Cleaning
(Difficutt
Scaling
and
Particle Buildup
Problems)
1.
Consult installer
due
to
dangerous
natu.re
of
acids.
2.
kon
out solutions
and de-scaling products
are also
useful.
VIT. UNIT SIZING
Selecting
the
unit
capacity of
a
geothermal
heat
pump
requires two
things:
A)
Earth Loop Configuration
and Design Water
Temperatures.
B)
Building
Hear
Loss/Ileat
Gain.
A.
Loop Configuration
and Design
Water Temperatures
Loop
configurations include
the open and closed
loop
varieties.
Heat pump capacity
and
flow
rate requirements
vary depending on loop
configuration
(see Table
3).
8