Variable Speed; Unit Location/Lvlounting - Econar GeoSource Invision 3 Q Series Installation And Operating Instructions Manual

3.
Water Quality
The water circulating through
the
DHW
side
of
the
geothermal
heat
pump
system is the transfer medium
for
the heat being supplied to the storage
tank. Ifpoor
water
conditions exist on the site,
buildup
can accumulate inside
the condenser
coil
and
restrict
heat
transfer.
This
reduces
the
efficiency of
the system and can
cause
the heat
pump
to run
at
higher
head pressures and lock out.
Bacteria
or
algae
growth in
the heat exchanger is
a
possibility,
especially bacteria or
algae
that
thrive
at the
particular
temperatures
produced in
the
heating system.
DHW
condenser cleaning is
similar
to the cleaning techniques
discussed
in
the open
loop section, except that
freeze
cleaning is impossible.
B. Variable
Speed
Blower
A
variable
speed
DC blower
motor
is used
on
the
GeoSource Invision3
series heat
pump to
keep the
two-
stage operation
of
the system operating
comfortably
and
efficiently.
These motors convert 230
Volt
AC
power to
DC power internally.
The
DC power
can then be
modulated to turn
the
motor
at
a
variety of
speeds.
The blower's
speed is
modulated
based on
what
the
thermostat is telling
it.
If
the
thermostat is asking for only
the
FAN to
operate, the
blower
will
put out approximately
650 cubic feet per minute
(CFM) of airflow.
This low
CFM output
will
gently circulate air *roughout
the
house,
eliminating
hot
or
cold spots, and actually
reduce
the need
for
mechanical heating or cooling
at
certain
times
of
the
year.
The
DC blower
can
supply this
minimal CFM
output
with
a
very low electrical
usage.
When
the
thermostat
asks
for
frst
stage
heating or
cooling,
the
fan
speed must increase to
its
medium
speed
setting. When
the thermostat
asks
for
second
stage
heating or cooling, it
will
bring
the
fan
speed up to
high
speed. The air coil
has a
minimum CFM
requirement to
operate
properly
based on the
number of
compressors
running
at
any given time. With
one
compressor running,
the
medium
speed setting must supply
enough
airflow.
With both
compressors
running,
the high-speed setting
is
required.
The fan
speeds
of
the GeoSource
Invisionr
heat
pumps
are
factory
set
to provide
the highest
efficiency
at each
stage
ofoperation.
The
controller provides
a
total
of l2
fan
speed
set
points.
There
are
four
selectable
CFM
outputs
in
each
of
the three
fan
speed
ranges
(Low, Med.,
and
High).
These
fan
speeds
can be adjusted slightly from their factory setpoint
to optimize the
comfort
and
efficiency
level
for
each
particular
installation.
The
blower
motor
also
provides
internal
circuitry
that
will fty
to maintain the setpoint
CFM
when changes occur
in
the
external static pressure,
such
as
the
filter getting
dirty over
time.
The motor
does
this by increasing its torque output to
compensate
for
external resistance changes.
The blower
is
also programmed to provide soft starting to
reduce air noise,
delays
after compressor shutdown to
distribute
all
the heat oulput
from
the
compressor to
the
heated space, and
ramped
speed
changes.
All
these
features are designed
for
quiet, comfortable, efficient
operation.
C.
Dual Compressor Operation
The GeoSource
Invision3
heat
pump
uses
two Copeland
ScrollrM
compressors, each
with
their own
totally
independent R-410a refrigeration circuit,
to supply
these
very important operating features
:
1)
Balanced
compressor
runtime
is achieved
by
using compressor
#1 for
frst
stage heating
and
cooling (which
handles the
majority of
the
building load)
and compressor #2
for
second
stage
heating
and
either
second stage cooling
or
full-time
domestic hot water heating
2)
The
ability
to heat hot water
without interrupting
the
flrst
stage heating
and cooling
process.
3)
Inherent heating backup.
If
the
frst
stage
heating circuit
is
down for
service the second
stage heating
circuit
is
still
operational.
4)
Extended runtimes without intemrptions to
maintain
the
highest comfort possible.
5)
High heating output
and moderate cooling output
with
staged capacity to
precisely fit
the
heating
and
cooling loads of
homes
in cold
climates.
6)
Allows for
the
use
of
Copeland
ScrollrM
compressors
in
a
multistage geothermal
heat
pump
system.
7)
Facilitates zoning
of
airflow.
With only
one
air
zone operating,
the
unit's
total capaciry can be
reduced to match
the
load.
III.
UNIT LOCATION/
MOUNTING
Locate
the
unit in
an
indoor
area
where
the ambient
temperature
will
remain
above
45oF.
Servicing of
the
heat
pump is
done
primarily from
the
front.
Rear
access
is desirable and should
be
provided when
possible. A
field
installed drain pan is required
under the
entire
unit
where accidental water
dischar_ee could damage
surrounding floors, walls or ceilings.
VCAUTION
- Oo not tip
units on
their
side
during
transportation or installation, or
severe internal
damage
may occur.
4
I
The
built
in
DHW pump
can be removed
by
loosening the
two Allen
screws
connecting
the
motor to
the
pump
housing.
A
magnetically driven rotor
snaps
onto the
motor
spindle and can be replaced or cleaned easily.
Noisy pump operation may indicate
a
dirty or
worn rotor.
Poor water
quality
may require
scheduled
pump
and
circuit cleaning. Always
shut
power to
the heat
pump
off
before servicing.
I