Econar GeoSource Invision 3 Q Series Installation And Operating Instructions Manual page 10

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Figure
2
- Open Loop
Water Plumbing
Water
discharge
is generally
made
to
a
drain
field,
stream,
pond,
surface
discharge,
tile line, or storrn
sewer'
9CAUTION:
Using
a
drain
field
requires
soil
conditions and adequate
sizing to
assure
rapid percolation,
or the required
flow
rates
will
not be
achieved. Consult
local codes and ordinances
to assure
compliance.
E
pf
discharge water to a septic system.
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.
VENO:I
continually
reset the
unit;
if
the
unit locks out more than once
call
your
service
professional.
EContinued
reset
of
the
unit
cafifreeze 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,
IrolE
the use
of
freeze
protection switches.
If
the
water supply to the heat
pump is intemrpted
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 heat exchanger.
The freeze
protection switch
(ECONAR
Part
#75'1045)
will
shut the
unit
down before freezing
can
occur
and
8
protect
the heat
pump
against
loss of
flow.
Two
freeze
protection switches
must be
field
installed on open
loop
GeoSource
Invision'heat
pumps before
the
warranty can
be
registered on the heat
pump.
They mount on the
compressor's suction lines
and are
wired to terminals on
the
controller (from
X
to
FPI
and
X
to FP2 respectively).
After
the freeze
protectio!
switches are
installed. the J2
and
-I-t
iumoers must be
removed from
the
controller to
activate
the
switches.
These
low pressure switches
now
lock
the
unit
off
at 65
psi
pressure
in
the
heating
mode"
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
theT-9
range, or
biological
growth. If
poor water
quality
is
known
to exist
in your
area,
installing
a closed
loop
system
may be the best
alternative.
Water
coil cleaning
on an open
loop
system
may be necessary on
a
regular
basis.
Depending on the
specific water
quality
issue, the
water coils 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