Additional Control - Econar GeoSource Invision 3 Q Series Installation And Operating Instructions Manual

2.
Air flow
or temperature
Problems
3.Internal heat
pump operation problems
4.
Cold
ambient air temperature conditions
flIf
a
lockout condition
exists, the heat
pump should
not
be reset
more than
once;
a service
technician should
be
called
immediately.
VThe
cause
of
the
lockout must
be
determined.
Repeated reset
may
cause damage
to
the
system.
9. Compressor Anti-Short-CYcle
An
antislort-cycle is
a
delay period between
the
time a
compressor
shuts
down and
when that compressor is
allowed to come on
again.
This protects the
compressor
and
avoids nuisance
lockout
conditions'
Anti-short-
cycles occur after these three
conditions;
1.
A
30 second
to one
minute time-out period occurs
on
a
compressor
before
it
will
start after
its last
shutdown.
2.
A four minute
35 second
delay is
incorporated
into
the
timing function immediately
after power
is
applied to the heat
pump'
This occurs
only
after
reapplying power to the
unit'
To avoid this
timeout
while servicing
the
unit,
apply power,
disconnect and
reapply power very
quickly'
This
can sometimes
eliminate the
waiting period'
3"
A four-minute anti-short-cycle
will
occur after
a
low-pressure switch opens
in the
cooling mode'
This is done to eliminate
nuisance
lockout
conditions.
tlf
the
compressor
contiluously
short cycles
in
the
cooling
mode, shut
the
thermostat
off
and
call your service technician.
10. System
Diagnostics
The conffoller is equipped
with
diagnostic
LED lights that
indicate the system status at
any particular
time.
The
lights indicate the
following
conditions:
l.24Yoltsystempower
GREEN
2. Faultorlockout
RED
3.
Condensate
overflow
RED
4.
Anti-short-cycle
mode
RED
5.
Forced air compressor
operation
RED
6.
DHW
operation
RED
7.
Pressure
switch status
on
lockout
YELLOW
8.
Controller outputs
(M1
through
M10)
RED
1L. Overflow Detection
An overflow detection
sensor
is standard on the
GeoSource
Invision3.
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
khked,
and the
unit is not draining water, the sensor
will
shut the
heat
pump
off for
an
anti-short-cycle period
of
approximately
3 minutes and 35 seconds.
After
this time,
the heat
pump
will
start
again
if
the condsnsate has
drained.
If
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.
D.
Additional Control OPtions
In addition
to the
conffoller features
listed above some
additional
options
have been
incorporated
into
the
GeoSource^Invisions
heat
pump.
Additional control
options offered on the
controller include;
1)
Increaseddehumidification
2)
Extemal
DHW
Sensor
3)
2nd
stage
forced air
priority
over
DHW
4)
Disabling the
DHW
heating system
5)
DHW
TemPerature
LolHi
JumPer
6)
EconomY/ComfortMode
1.
Increased
Dehumidification
To increase the
ability of the
GeoSource
Invision3
heat
pump to
dehumidify the
conditioned space
in
the
cooling
mode,
a
humidistat can
be
wired to the
controller on the
2-pole
termiaal
strip labeled
H-R.
When the
humidity
level increases and the contacts
of
the
humidistat
make,
the
controller reduces the
CFM output
of
the
blower'
Reducing
CFM in cooling results
in lower
air
coil
efficiency
but higher levels
of moisture
removal'
A
humidistat
will
not be necessary
in
most cases'
When using
a
humidistat care
must be taken so
that
a
minimum CFM
is always
present at the
coi1.
Too
little
airflow
will
result
in freezing
of
the
air coil and
compressor shutdown and short
cycling. When
the
humidistat
makes, the
blower speed is reduced one
level
(from HI
to
MED,
and
from
MED
to
LOW).
The
LOW
speed
setting must be
manually increased
when
installing
a
humidistat. Moving
the
jumper
position on
the
"fan
speed
range"
terminal strip (see
electrical diagrams) does
this.
Refer to the
airflow chart on the bottom
of
the
electrical diagram
for correctjumper position
setting.
Z.External DHW
Sensor
GeoSource
Invision3
heat
pumps with
either the
-DHW
or
-DWR
hot water option have the
ability to
have an
external temperature sensor
installed,
which
could be set
to achieve
a
lower tank temperature
for radiant
floor
applications. To do this, mount an aquastat on the storage
tank
and
wire it
to the
2-pole terminal strip labeled
X-
DHW AUX
on the
controller. Then, remove
jumper
Jl
to
activate
this
control
(see
Figure
7).
Atter
the
normal
sampling period,
if
the aquastat
is
calling,
the second
compressor
will
start
in
the
DHW
mode, and run
until
the
aquastat
is
satisfied. This
aquastat
shutofftemperature
should be
set
at
I 10oF
or lower to
effectively
override the
intemal controls.
3.
2"'l Stage Forced
Air
Priority
over
DIIW
GeoSource
Invisionl
heat
pumps
are sent
from the
factory with
DHW priority
over
2od
stage
forced
air
heating.
This means
if
a
call
for DHW
and
2nd
stage
forced air
heat
occur at the same time,
DHW will
run
and
satisfy before the second
compressor comes on
with
a 2od
13