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exist on
the
site, softened water
is
recommended,
or
acceptable
water should
be
brought
in.
Bacteria
or
algae
growth in
the
water is
a
possibility,
especially bacteria
or
algae
that
thrive
at the
particular
temperatures
produced
in
the
heating
system.
This
growth
can
cause
buildup
on
hydronic
side heat
exchanger
surfaces,
reducing
the
efhciency of
the
system
or causing
the heat
pump to run
at
higher
head pressures and
possibly
lock
oul
Adding
a
gallon
of
bleach or
boiler
system
conditioner
can reduce
the
possibility of growth
and clean
up visual
flow
meters
and
other components
in
the system.
Chart
I
-Propylene
GlycoVWatJSolution
Freeze
point
VolurDi
*
proprl.m
Brycol
h
Wet.,
D. Expansion Tanks
Expansion tanks must
be used
in
the
hydronic
side
of
the
GeoSource
DualTEK
heat
pump
system
to
absorb the
change
in
pressure
ofthe
closed
system due
to
the change
Rrdie!
fl@r
th@6bb sd
poetr
supply
b
opctr
Mc vdv6 hd etivsb
Gurg.
thmctat
b
in
temperature when
heat
is supplied to
the system.
Diaphragm-type expansion tanks should
be
used.
The
diaphragm
in
these tanks
is
filled
with
pressurized air,
which
expands,
or contracts to maintain
a
constant
overall
system pressure
as
the
fluid
in
the system expands
with
increasing temperature.
Use
EPDM
diaphragm
tanks
because
they
are
compatible
with
glycol-based antifreeze
fluids (butyl
rubber diaphragms
will
slowly
dissolve
with
glycol-based antifreezes).
Tanks
from
1
to
10
gallons
are
generally
used
with
heat
pump
systems
in residential
and
light
commercial
applications.
Expansion tanks
should be
installed
in
the
system near the
suction
of
the
circulator
pump whenever
possible.
This
maintains
positive
pressure at the
circulator
pump
and reduces the
highest
working
pressure
of
the
system. A
pressure gauge near the
inlet of
the
expansion tank gives
a
good
indication of how
the system
is operating.
Pressure
relief
valves
are
required on
all hydronic
applications.
A
30
psi
relief is
adequate
if
the
system
is
operated
at
12
to
15
psi pressure.
If
a
hot water
heater
is
used
for
a storage
tank, the
150
psi
pressure
relief
may
be
acceptable
(check local
codes).
E.
Application Diagrams
Figures
1
through 3 show
the
components
ofa
GeoSource
DualTEK
heat
pump
system discussed above
used
in
some
common
applications.
These
frgures by no
means represent
all
the
possible
heat
pump applications,
but they do show
some
important
principals
that
can be
applied
to
any system.
Supply
Air
3a
'30
tt
Eaz
a
E
!t!
G
fre
!ro
o
Ec
2
.2
,.6
oacl2!02f
2a?tr
!2!a40
Notc:
Alw.ysBccoppdpipc
whcn
plurbing
hydronic
syrm
oPo
z6c
only,
Thir
em<ir
flow
b
thc
guagc
flor
orly
q,ha
ihc
oth6
cdlitr&
which
butf@
thc hcst
pmp agaiut
bw
ofcold
Radiut floor zon6
NoE:
Cmo.ptul
dnwing only.
Cheok
local
@d6
md
ue
prcptr
plmbing prcccduc.
Gange
Iloor rcac
7
bnk
\
G@S()lre
DUITR
I
t
tminat
Cieulatim
pup
(230
Figure
1-GeoSource
DualTEK
Heat Pump
-
Multizone Hydronic
Heating and Forced
Air
Heating/Cooling
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