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Froa
Exprcion
Tank
Shaotr
Valvs
Staiffi
Vi6ua1
Flow
MEts
Boila
Drais
IN
OUT
Solaoid
Valve
Flow
Cmtrol
Valve
Prsffi1
Topuahrs
(P/T) Ports
€
Discbrge
--
I
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Figure
2
-
Open Loop
Water Plumbing
The
heat
pump
should never be operated
with
flow
rates
less
than
specified.
Low 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.
If
the
unit
locks out,
verify
that
the
unit
has
the
required
flow
and reset the
unit by
shutting
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
can
freeze
water inside
the
water
coil
to
the
point
of
rupturing
the water
coil.
1.
Open Loop Freeze Protection Switch
Heat
pump installations
on open
loop
systems,
using
a
non-antifreeze protected water
source
during
the
heating
mode, requfue the
use
of
a
freeze
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-refrigerant
heat
exchanger
to
freeze and
rupture
the
copper inner
tube.
The
freeze
protection switch
(ECONAR
Part#75-1028)
will
shut the
unit
down before freezing
can
occur
and
protect
the heat
pump
against loss
of
flow.
Afreeze
protection switch
must be
field
installed
on open
loop
GeoSource 2000
heat pumps
before the warranty
can be
registered
on the heat
pump.
The switch mounts
on
the
compressor's suction
line
and
is
wired
to terminals on
the
controller (from
X
to FP).
After
the freeze
protection
switch is installed,
the
J4
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.
6
2.
Water Coil Maintenance
Water
quality
is
a
major concern
for
open
systems.
Problems
can
occur
from
scaling, particle
buildup,
suspended
solids, corrosion, pH levels outside
the
7
-9
range,
or
biological
growth.
If
poor water
quality
is
known
to
exist ia
your
area,
a
cupro-nickel
water
coil
may
be
required when ordering
the system,
or
installing
a
closed
loop
system
may
be the best
altemative.
Water
coil
cleaning
on open
loop
systems
may
be necessary
on
a
regular
basis.
Depending on
the
specffic 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.
Determhe
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.
tr.
If
cleaning
of
the
water
coil
is indicated,
please
carefully
follow
the steps
listed below to
utilize
the
freeze
cleaning method.
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