Econar GeoSurce Vara 2 Plus GV Series Lnstallation And Operating Lnstructions page 9

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3
- Open Loop Water Plumbing
Schedule
40 PVC
piping,
copper tubing, polyethylene or
rubber hose can be used for supply
and discharge water
lines. Make
sure
line
sizes are large
enough
to supply
the
requfued
flow
with
a
reasonable pressure drop (generally
l"
diameter
minimum).
Water
discharge
is generally
made
to
a
drain
field,
stream,
pond,
sudace discharge,
tile line, or
storm sewer.
VCAUTION:
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.
D0
pf,
discharge the
water into
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
freeze
protection (FP) lockout. Ifthe
unit locks out,
verify that
the
unit
has the required
flow
and reset the
unit
by shutting offpower
to
the
unit for
one
minute. VDO
![Qf, reset the
unit;
if
the
unit
locks out more than
once
call your
service
professional.
EContinued
reset
of
the
unit
can freeze water inside the water coil
to the
point
of
rupfudng
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,
require
the
use
of
freeze
protection switches.
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 heat
exchanger.
The
freeze
protection switch (ECONAR
Part
#
75-i045)
will
shut the
unit
down before freezing
can
occur
and
protect
the heat
pump
against loss
of
flow.
A FREEZE
PROTECTION SWITCH MUST BEFIELD
INSTALLED
ON
OPEN LOOP
GeoSource
Vara 2
prus'*
HEAT
puMps
BEFORE
TrrE wARRANTy
CAN BE REGISTERED
ON THE HEAT PUMP.
This
switch mounts on
the compressor's suction line
and is
wired to terminals on
the
controller (from X
to
FP). This
low
pressure switch now locks
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
thel-9
range, or
biological
growth.
If
poor water quality
is
known
to exist
in your
area,
a
closed loop may
be the best
application. Water coil
cleaning on
an open
loop
system
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 temperafure
differential of
the
1