Econar GeoSource Vara GV Series Installation And Operating Instructions Manual page 8

On the
well water discharge side
of the heat
pump,
a
flow
conffol
valve must
be
mounted next to the heat
pump to
regulate the
maximum water
flow
through
the
unit. A
solenoid valve is
then
installed
and
wired
to
the accessory
plug @A)
on
the
conftoller of
the heat
pump' This
valve
will
open
when the
unit
is
running and
close when
the
unit stops.
A
visual
flow meter is
then
installed to
allow
visual inspection
of
the
flow requirements.
The
flow
meter can also be
useful
in determining when
maintenance
is required
(if
you can't read the
flow,
cleaning is
required,
see
Water
Coil Maintenance).
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
required
flow
with
a
reasonable pressure
drop (generally
1" diameter
minimum).
eNote:
Do
not
use
plastic
female
fittings with metal male fittings,
or fractures may
result
in
the
female
fittings.
Always
use
plastic male
into
steel female!
Water discharge
is generally
made to
a
drain
field,
stream,
pond, surface 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.
@
pf
discharge water to a septic system.
<
Disobage
--J
Figure
3
- Open Loop
Water Plumbing
6
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. EContinued
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,
glgg
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
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
fleld
installed on open
loop
GeoSource
Vara
heat
pumps before
the
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). After
the freeze
protection
switch is
installed. the J4
iumper and the blue iumper
wire from X to FP must
be
removed from
the
controller
to activate the
switch.
This
1ow
pressure switch
now
locks the
unit off
at 35
psi pressure
in
the heating mode.
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