Econar GeoSource Invision 3 Q Series Installation And Operating Instructions Manual page 14

with
output air temperature or reduced
airflow, locking
out the
unit.
2.
Farth Loop Pump
Initiation
On
units
with
a
domestic hot water heating
option
(-DHW
and
-DWR),
a
control signal
is
sent
to
the
loop pump
relay
to
energtze the
high voltage three
pole terminal strip
to supply
230-volt power and
bring
the
loop pump
on.
The loop pump is
energized
two
seconds
before either one
of
the compressors
come
on.
cNote:
Be sure
the loop pump is
wired
to the
3-pole
terminal strip
on
DHW units and not
directly
to a
contactor,
or
the
DHW operation
will
not
energize
the
loop
pump.
The loop pump output is
also
direct wired to
Plug#2 (P2) to
open a
solenoid water valve on
well water
applications.
On standard 2-Heatl2-Cool (-000
and
-SUP) units the
earth loop pump should be
wired directly to the contactor
of the
l't
stage
compressor. On open
loop
systems, a
water
valve
should
still
be
wired
to Plug
#2
alrtdthe
corresponding indicator
light
will
be
lit
whenever Plug #2
is energized.
If
you wish to wire the earth
loop pump to
a
relay
instead
of
the
contactor,
wiring
it to Plug #2 on
the
controller
can
energize the
relay.
3. Compressor Operation
for
1't Stage
Heat/Cool
A Y1
signal
from
the
thermostat
will
ask the
controller
to
initiate
I't
stage
heating or
cooling.
The
controller then
decides, based on
lockout
and
anti-short-cycle periods,
when to bring
compressor
#1
on.
The corresponding
output
of
the
controller energizes
the 1"
stage
heating and
cooling compressor. This compressor
stays on
until
Yl
(or
l't
stage)
on
the
thermostat is satisfied.
4. Temperature Sampling
for DHW
On units
with domestic hot water heating, the
temperature
of
the
water
in
the
hot water tank is
sampled
every seven
minutes. This sampling is done
by energizing the
DHW
pump for
a
one-minute period with
the
M6
output
of
the
controller. This pump circulates water through the heat
pump
and
warlns
a
temperature
sensor
mountgd on the
intemal copper
pipe. At
the end
of this one-minute
period
the
DHW
sensor samples the temperature
of
the
pipe
and
circulated
fluid
and energizes the
compressor
if
the
water
temperature is
below the reset
point.
5. Compressor Operation
for DHW
On
units
with domestic hot water heating, compressor
#2
is
energized by the
M2 output of
the
confroller. This
output is energized to heat
domestic hot water whenever
the
water
in
the
water
heater drops
below the reset
temperafire
during
the
water sampling sequence.
This
compressor remains running
until
the
hot water
temperature reaches
its shutoff
temperature. Operation
of this compressor in
DHW
mode
will
override
the 2'd
stage
forced air heating mode
if it
is
rururing. An anti-
12
short-cycle period
will
intemrpt the compressor's
operation whenever
it
switches modes.
6.
Compressor Operation
for
2"d Stage
HeaUCool
A Y2
signal
from
the
thermostat
will
ask the
controller to
initiate compressor
#2.
The controller then decides, based
on
lockout,
anti-short-cycle periods
and
priorities,
when
to
bring compressor #2 on
in forced air heating or
cooling. The
M2
output of
the
confroller
energizes the
2nd
stage
compressor.
Units
equipped
with
the
-DHW
or
-DWR option
are
factory preset
for DHW
priority
over second
stage
heating.
Therefore, fhey must wait for
the water heating
mode
to
satisfy before going to
second stage
forced
air
heating. This normally satisfies
quickly
and does
not
interfere
with heating
comfort. The
priority
may be
changed
by moving
Dip
Switch #3 on the
controller to the
OFF
position.
Second stage
heating now
has
priority
over
domestic water heating.
AY2
call
from
the
thermostat
in
the
cooling
mode
on
-DHW or -DWR units
will
not bring compressor
#2 on
but
will
increase the
fan
speed
to high.
7.
4-Way Valve
Control
The controller
energizes
both 4-way reversing valves to
direct
the
flow of refrigerant
in
the
following
instances;
1.
When the
thermostat calls
for cooling
on the
O
terminal, the
confroller
energizes
its
M3 output
to
send
control power to VR1 to switch
compressor
#1 to the cooling mode.
2.
When the
thermostat calls
for
2'd
stage
heating
on
-DIfW
and
-DWR
units, the
controller
energizes
its
M4
output to send
control power
to
the
VR2
solenoid
coil to switch compressor
l*2 from
DHW to forced air heating
mode.
This
occurs
when
DHW
is satisfied
(DHW
is
factory
preset
for
priority
over second stage
heating).
3.
When the
thermostat calls
for
2od
stage
cooling
on2-Heat/2-Cool units,
VR2
will
be
in
the
cooling
position.
8.
Compressor
Lockouts
A
compressor
lockout
occurs
ifthe
high-pressure,
low
pressure
(in all
modes except
cooling), or freeze
protection pressure switches
open. The controller blocks
the
signal
from
the
thermostat to
the
contactor that
normally would energize
the
compressor.
In
the event
of
a
compressor
lockout,
the
controller
will
send
a
signal
from
L
on the
terminal strip
to
an
LED
on
the
thermostat
to
indicate
a
lockout
condition.
This lockout condition
means
that
the
unit
has shut
down to protect itself,
and
will
not
come
back on
until power
has been
disconnected
(via
the
circuit breaker) to the heat
pump for
one
minute.
Problems that could
cause
a
lockout
situation include:
1.
Water
flow or temperature problems