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call for
forced air,
the heat
pump
will
shut
down
for
an
anti-short-cycle period,
and then
run
in
the
forced
air
mode
until
the
thermostat is
satisfied.
At
that
time,
if
the
aquastat
is
still calling for hydronic
heating,
the heat
pump
will
start again
in
the
hydronic
mode after
an
anti-
short-cycle.
If Dip
Switch #1 is
set
to
the
OFF position,
hydronic
heating
has
the
priority
over forced air heating or cooling,
9. Over{Iow Detection
An
optional
overflow
detection
sensor
may
be added
to
the
GeoSource
DualTEK
heat
pumps. This
sensor is
located
in
the
drain pan,
and
monitors
the
amount
of
water accumulated
in
the
pan.
If
the condensate
drain
becomes
clogged
or
kinked,
and the
unit
is not
draining
water, the
sensor
will
shut the heat
pump
off
in
forced
air
cooling
for
an
anti-short-cycle period
ofapproximately
3
minutes
and
35 seconds.
After
this
time,
the heat
pump
will
start again
if
the condensate
has
drained.
ff
the
water
is
still
present,
the
unit
will
go through anti-short-cycles
until
the condensate
has
drained. This
protection switch
keeps the condensate
from overflowing
the
drain
pan and
possibly leaking onto
the
floor or ceiling.
XT. STARTUP
Before applying power to
the heat
pump, check
the
following
items:
-
Water supply
plumbing
to
the heat
pump is
completed
and
operating. Manually
open the
water
valve on
well
systems
to check
flow.
Make
sure
all
valves
are open and
air
has
been
purged
from
a
loop
system. Never
operate the system
without
correct
water supply.
-
All
construction
dust
has
been cleaned
up
and
all
sheet-rocking
is
completed.
Construction
dust,
especially sheet-rock dust,
can
plug
the
air
coil
and
block
airflow.
Make
sure the
filter
is
clean
before
starting
the
unit.
-
Low
voltage
wiring of
the
thermostat
and any
additional
control wiring
is
complete.
Set
thermostat to the
*OFF'position.
-
All
high voltage
wiring
is correct
including
fuses,
breakers, and
wire
sizes.
-
The
heat
pump is located
in
a
warm
area (above
45iF).
Starting
the system
with low
ambient
temperature conditions is more
difficult;
do not
leave the area
until
the
space
is
brought up to
operating
temperatures.
-
Hydronic
side
water
temperatures are
warrn enough
(50oF
or
above)
to
start
in
the
heating
mode.
-
The
hydronic
side
water
flow
rate is correct (shown
in
Table
5).
Low
water temperature starting may
require
flow
reduction
until
the
system is
up to
operating temperature.
You
may
now
apply power to
the
unit.
A
4 minute
35
second
delay
on
power
up is
programmed
into
the heat
pump before
the
compressor
will
operate. During
this
time
the
pump relay
will
energize
the
hydronic
side-
circulating
pump,
if
the aquastat
is
calling for
heat.
Verify
that
the
flow
rate and
temperature
of
the
hydronic
side
flow
are at the
recommended
levels. Also, during
this time, you
can
verify
airflow
with
the
following
procedure:
-
Place the
thermostat in the
"pdlq
g}.{rt
position.
The
blower
should
start
immediately.
Check
airflow
at
the
registers to
make sure
that they
are open and
that
air
is
being distributed throughout
the
house. When
airflow
has
been
checked, move
the
thermostat to
the
"FAN AUTO" position.
The
blower
should
stop.
The
following
steps
will
assure
that
your
system
is
heating
and
cooling
properly.
After
the
initial
time-out
period is completed,
the red
ASC
indicator light
on
the
controller
will
shut
off.
The
heat
pump is now ready
for
operation.
-
Turn
the
thermostat
up
to its highest temperature
setting.
Place the
thermostat
to
the
"HEAT"
position.
The
blower
will start.
The compressor
should start
I
to 2
seconds
later.
Ifan
electronic
thermostat is
used
it
may
cause
its own compressor
delay
at
this time, but
the
compressor
will
come
on
after
the
time-out period.
-
After
the
unit
has
run
for
5 minutes, check
the
return
and
supply air temperatures.
An
air temperature rise
of
25T
to
35oF
is normal in
the
heating
mode,
but
variations
in
water temperature
and
water
flow
rate
can
cause
variations outside
the
normal
range.
-
Turn
the
thermostat to
the
"OFF" position.
The
compressor
and
blower
will
shut
down
in
I
to
2
seconds.
-
Next,
turn
the
thermostat down to its lowest
setting.
Place the
thermostat
in
the
"COOL"
position.
The
blower
will
start.
The compressor
will
start after
an
anti-short-cycle period
from its
last
shutdown.
The
anti-short-cycle period is indicated by
the
red
light
on
the
confroller.
-
After
the
unit
has
run
for
5 minutes, check
the
return
and
supply air temperatures.
An
air temperature
drop
of
15"F
to 20"F
is
normal
in
the
cooling
mode
but factors mentioned
in
the
heating section
can also
effect temperature drop.
-
Set the
thermostat to
the
OFF position,
and
set
the
aquastat
to
heat at
its highest
setting.
-
After
an
anti-short-cycle period,
the
compressor
will
come on.
-
After
the
unit
has
run
in
the
hydronic
mode
for
5
minutes, check
the
hydronic
side
return
and
supply
water temperatures.
A
water temperature rise
of
10nF
to
15nF
is
normal, but variations
in
entering
water
temperatures and
water
flow
rates can cause
variations.
-
Set the
thermostat
for
normal operation.
-
Instruct
the
owner
on
correct operation
ofthe
thermostat,
aquastat, and heat
pump system. The
unit
is
now operational.
77
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