Vl Unit Sizing E - Econar GeoSource Invision 3 Q Series Installation And Operating Instructions Manual

temperature difference
of about
1
0- I
5 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.
II. If
cleaning
of
the
water coil is indicated,
please
carefully
follow
the steps
listed below to
utilize
the freeze
cleaning method.
1.
Turn off
the heat
pump
and
its
water supply.
2.
Open
a
plumbing
connection on
the water supply
side, ifpossible, to break the system
vacuum and
allow
easier drainage
of the 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, and the
drain on the heat exchanger.
SWARNING!!
9
FAILURE
TO
COMPLETELY
DRAIN THE 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
off
on
low
pressure and then turn
the
thermostat to the
"Off'position.
6.
Recap the water drain
and
tighten
any
plumbing
connections that may
have been loosened.
7.
If
so
equipped, open the
field
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
offlushing
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
the 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
rhawed
out.
1
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 enrire
procedure listed
above.
12. Reset the heat pump
for
normal operation.
b.
Chlorine
Cleaning
(Bacterial Growth)
1.
Turn
the
thermostat to the
"OIf'
position.
2.
Connect a submersible
circulating pump to
the
hose
bibs on the entering and
leaving water
sides
of the heat exchanger.
3.
Submerse the
pump in
a
hve-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
bacteria
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 of
the heat
exchangers,
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.
tContact
a
well driller in your
area
for
more information.
c.
Miratic Acid
Cleaning
(Difficult
Scaling
and
Particle Buildup
Problems)
l.
Consult installer
due
to
dangerous nature of
acids.
2.
Iron
out solutions
and de-scaling products
are also
useful.
VT.
UNIT SIZING
Selecting
the
unit
capacity of
a
geothermal
heat
pump
requires
two
things:
A)
Earth Loop Configuration
and Design Water
Temperatures.
B)
Building
Heat Loss/Ileat
Gain.
A.
Loop Configuration
and Design
Water Temperatures
l,oop
conhgurations include
the
open
and closed loop
varieties.
Heat pump capacity
and
flow
rate
requirements
vary depending on loop
configuration
(see
Table 2).
9