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Staiffi
Visual
Flow
MBIE
Frm
Expoioo
Tro&
Boila
Drais
Shtoff
Valvcs
IN
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Solmid
Valve
Flow
Cmhol
Valve
Prsm/
T@IEshre
(P/T)Pdts
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Disobrge
Figure
5
-
Open Loop
Water Plumbing
The
heat
pump should
never be
operated
with
flow
rates
less
than
specified. [.ow
flow
rates
or
no
flow
may result
in freezing water
in
the
water to refrigerant
heat
exchanger. This
will
cause the
unit to
shut
down on
low-
pressure
lockout.
Ifthe
unit
locks out,
verify
that
the
unit
has the
required
flow
and reset the
unit by
shuming
off
power to
the
unit for
one
minute.
VDO NOT
continually
reset the
unit,
if
the
unit
locks out more
than once
call
your
service
professional.
SContinued
reset
of
the
unit
car,
freeze
water inside
the
water
coil
to
the
point
of
rupturing
the
water
coil.
L.
Open Loop Freeze Protection Switch
Heat pump installations
on open
loop
systems,
using
a
non-antifreeze protected water
source
during
the
heating
mode, reouire
the
use
of
afreeze protection
switch.
If
the
water supply to
the heat
pump is interrupted
for
any
reason,
continued operation
of
the
compressor
would
cause
the water remaining
in
the
water-to-refiigerant
heat
exchanger
to
freeze
and
rupture
the
copper inner
tube.
The
freeze
protecrion switch
(ECONAR
Parr
# 75-1028)
will
shut the
unit
down before freezing
can
occur
and
protect
the heat
pump
against loss
of
flow.
A
freeze
protection
switch
must be
field
installed on
open
loop
GeoSource
DuaITEK
heat
pumps before
the
waranty
can be
registered
on the heat
pump.
The switch mounts
on
the
compressor's suction
line
and
is
wired
to terminals
1.
on
the
controller (from
X
to
FP1).
After
the
freeze
protection
switch is installed,
the
J3
jumper
must be
removed
from
the
controller to
activate the
switch.
The
low
pressure
switch now locks
the
unit
off
at 35
psi
pressure
in
the
heating
mode.
2.
Water Coil Maintenance
Water
quality
is
a
major concern
for
open systerns.
Problems
can
occur
from
scaling, particle
buildup,
suspended
solids, corrosion,
pH
levels outside
theT-9
range,
or
biological
growth.
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
closed
loop
system
may
be the best
alternative.
Water
coil
cleaning
on open
loop
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:
a.
Freeze.Cleaning
(Scale deposits,
particle
buildup)
I.
Before using
the freeze
cleaning procedure,
verify
that
it
needs to be
done.
Answer
the
following
questions
to
determine
if
servicing
is
required.
1.
Determine
and
verify
that
the
required water
flow
rate
in GPM
is
both present
and
correct.
2.
Determine
the
temperature
differential of
the
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.
I
J
11
I
I
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