Vl Earth Loop Water Piping - Econar GeoSurce Vara 2 Plus GV Series Lnstallation And Operating Lnstructions

Table
2 -
Blower
Note:
Adjust
Tap
set
to
"+" will
increase these numbers
by
Adjust
Tap set to
"-" will
decrease thess nurnbers
by
107o
VT.
EARTH LOOP WATER
PIPING
Since water is
the source
of
energy
in
the
wintertime
and
the energy sink in the summertime, good water supply is
possibly
the
most important requirement
of
a
geothermal
heat
pump
system
installation.
There
are
two
common
types of
water supplies, closed loop
systems and open
loop
systems.
eNote:
When
plumbing
the earth 1oop, do
not
use
plastic female
fittings with
metal male fittings, or
fractures may result in
the
female
fittings.
Always
use
plastic male into
steel
female!
A.
Closed
Loop Applications
A
closed
loop
system recirculates
the same
water/antifreeze solution through
a
closed system
of
underground high-density polyethylene pipe.
As the
solution
passes through
the
pipe, it
collects heat
(in
the
heating mode) that
is being transferred
from
the
relatively
warm surrounding soil
through
the
pipe
and
into
the
relatively cold solution.
The solution is circulated to
the
heat
pump, which pulls
heat
out of
the solution,
and then
back through
the
ground to extract more
heat
from
the
earth.
TOIFROM
CLOSED LOOP
The GeoSource
Vara
2
plrs""
is
desigaed to
operate on
a
wide variety of
closed
loop applications. Vertical
loops
are
typically
installed with
a
well drilling rig
up to 200
feet
deep
or more. Horizontal
systems are
typically
installed with
excavating or trenching equipment
approximately five
to eight feet
deep, depending
on
geographic location
and length
of
pipe used.
Earth loops
must
be sized
properly for
each
particular
geographic
area, soil type,
and
individual
capacity requirements.
EContact
your local loop
installer, ECONAR distributor,
or
GeoRep
(1-800-4-ECONAR) for loop
sizing
requirements in your
area.
Since
normal wintertime
operating entering water
temperatures
(E\\rI)
to
the heat
pump
a.re
from
25nF
to
32oF, the solution in
the earth
loop must
include
arrtifreeze. GTF
and
propylene glycot
are common
antifreeze solutions. GTF
is methanol-based antrfreeze,
which
should be mixed
50Vo
with
water
to
achieve freeze
protection of 10'F.
Propylene
glycol
antifreeze solution
should
be mixed22Vo by volume with
water to obtain
a
20oF freeze
protection. DO
NOT
mix more thut25Vo
propylene glycol with
water
in
an
attempt to achieve
a
lower
than
18oF freeze
protection,
since more
concentrated mixtures of propylene glycol
become too
\
f
--ll
___J
Figure
2
-
Closed
Loop Water Plumbing
5
A (Future
Use)
845 1480
1920
2000
B
(58 Series)
815
t425
1850
t920
C (48 Series)
740
1295
1680
1800
D (38 Series)
s20
910
1180
1300
P@pPAK
lt
il
il
hesuey'
T@I,@tw
(P/T) Pqts
T,dP
Low{G]
Medium-Low{Yl)
Uish{Wl/E)
IN
OUT