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The
heat
pump is equipped
with
both
high
and
low
pressure
switches that
shut the
unit
offifthe
refrigerant
pressure exceeds
400 psi or
goes
below
25
psi. Ifthe
system exceeds
400 psi,
the
high-pressure switch
will trip
and
lock
the
unit
off
until
power
has
been
disconnected at
the
circuit
breaker
for
approximately
one
minute.
System
pressures
below
25
psi
in
the
heating mode
will trip
the
low
pressure
switch
and
lock
the
unit
out
until
the
power
-
supply
has
been
de-energized
for
one
minute.
On
a
well
water system,
the
fr eeze
protection switch
(fi
eld
ins
talled
part number
7
5-1028)
will
activate
the
lockout
at 35
psi
in
the
heating mode
to
protect
the water
coil
against
freeze
rupture. After
resetting
a
lockout
(by disconnecting
power to
the
unit)
verify
that water
flow
is
at the
recommended levels before energizing
the compressor.
DO
NOT
reset a
well
water
system
without verifying
water
flow.
DO
NOT
reset
the
system
more
than once.
9Repeated resetting
of
the
lockout
can cause serious
damage
if
the reason
for lockout
is not corrected.
I
-
If
lockout occurs more than
once
contact
vour
ECONAR
dealer
immediatelv.
t
XII.
SERVICE
Regular service to
a
GeoSource
DualTEK
heat
pump
is
very
limited.
The biggest
factor
is changing
the
air
filter.
Other factors could include water
coil
maintenance on
an
open
loop
system
(this maintenance is
discussed
in
section
VI).
Setting
up
regular
service
checkups
with
your
ECONAR
dealer
could
be
considered.
Any major
problems
with
the heat
pump
system
operation
will
be
indicated
on the
thermostat
lockout
lisht.
A. Filter
The GeoSource
DualTEK
heat
pump is equipped
with
a
disposable air
filter.
This
hlter
should
normally
be
replaced
once
a
month
during
normal usage.
During
extreme
usage
or
if
system
performance
has
decreased,
the
filter
should
be
replaced more often.
A
dirty
fi1ter
will
reduce
the
airflow
to the
system. This
decrease
in
airflow
will
reduce the
efficiency
and
comfort
level of
the
system. In
the
heating
mode,
reduced
airflow
may
increase the cost
of
operation
and,
in
extreme
cases,
cause system
lockout
due
to
high refrigerant pressures.
In
the
cooling
mode,
reduced
airflow
may
reduce
cooling
capacity
and
in
extreme
cases
ice
the
aircoil
over, causing
system
shutdown
due
to
low
refrigerant
pressures.
If
another
filter
is
used
in
place
of
the
factory
specified
filter,
it
should
also be cleaned
or replaced
in
a
timely
manner.
Be careful
in
selecting optional
filters
so
that
excessive
external
resistance
to airflow
is not induced.
B.
Lockout Lights
A
lockout
light
on (he
thermostat
will
light
to indicate
major
system
problems.
If
lockout
occurs,
follow
the
procedure below:
18
1)
Check
for
a
clean
filter
and
correct water supply
from
the earth
loop or
well
water
system.
2)
Reset
the
system
by disconnecting power
at the
circuit
breaker
for
one
minute,
and then
reapplying
power.
3)
If
shutdown reoccurs, check
the
indicator lights
on
the
controller in
the
unit
and
review
the
lockout
troubleshooting guide
in
section
XIV
of
this manual.
4) tlf
lockouts persist,
call
your
ECONAR dealer. Do
not continuously
reset the
lockout condition or
damage
may occur.
C. Preseason Inspection
Before
each
season,
the
air
coil,
drain pan,
and condensate
drain should
be inspected and
cleaned
as
follows:
-
Tumoffcircuitbreakers.
-
Remove
access
panels.
-
Clean air
coil
by vacuuming
it
with
a
soft-brush
attachment.
-
Remove
any
foreign
matter
from
the
drain
pan.
-
Flush pan
and
drain tube
with
clear
water.
-
Replace
access
panels and
retum power to
the
unit.
X[I.THERMOSTAT
OPERATION
This
section covers
basic operation
of
the
standard
2-heat
l-cool
thermostat that
ECONAR carries. This
thermostat
is
ECONAR
part number 70-2002,
Honeywell
part
number
T8511G.
If
your thermostat is
a
different
style,
please
refer to
the
instructions supplied
with
that
thermostat.
The settings
of
the
thermostat
are
controlled
with
the
"System", "Fart",
"i",
up key,
and
down key
buttons.
The
System and Fan
buttons
are
located behind
the
flip-down
panel.
By
pressing
the
"System" button, you
can
control
the
mode
that
the
thermostat
operates
in.
The
five
system
settings are:
1.
Em.
Heat
-
Controls backup
heating. In
this
mode,
the heat
pump's
compressor is locked out,
and
only
the
backup heating
elements
(if
installed)
operate.
2.
Heat
-
Controls normal heating operation.
3.
Off
-
Both
heating
and
cooling
are
off.
4.
Cool
-
Controls normal
cooling
operation.
5.
Auto
-
The thermostat automatically
changes
between heating
and
cooling
operation, depending
on the
indoor
temperature.
Note:
When
the
thermostat
is
set
to
Auto,
there
must
be
at least
a
2oF difference between
the
Heating setpoint
temperature
and the
Cooling
setpoint temperafure.
The
"Fan"
button controls
the
operation
of
the heat
pump's
blower.
The
Fan
button
has
two
settings:
1.
On
-
The
blower
operates
continuously.
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