Startup - Econar GeoSource Vara GV Series Installation And Operating Instructions Manual

and
W2 signal to
the
controller for
2nd
stage heat
operation, the
controller
bumps the
blower
speed
to
High.
These system
configurations are tabled
in
the
airflow
settings (Table
2).
To
change
blower
speeds,
move
the
pin
jumper
labeled
"Adjust"
from its existing
location
to either
the
"+"
or the
":'tap.
This
will
adjust the
airflow either up or down by
70Vo
of
the
factory setting.
The pin jumpers
in
the
Low,
Medium,
and
High settings should not
be
moved from
the
factory
setting.
Z.Earth
Loop Pump
Initiation
If
a
PumpPAKrM is
used,
it
should
be
wired directly to
the
contactor of
the
compressor.
If
a
PumpPAKrM is not
used, a separate
pump
can be used
which
is energized
with
a
pump relay (Note: electrical
code
will
require
a
fused disconnect
for pumps other
than PumpPAKsrM).
When
there
is
a
call
for
an
Ml
output from
the
controller,
the
contactor
will
energize, starting
the
compressor
and
earth loop pump.
3. Compressor Operation
A Y
signal from the thermostat
will
ask the
controller
to
initiate 1"
stage
heating or cooling.
The controller
then
decides, based on
lockout
and
anti-short-cycle periods,
when to bring
the compressor
on.
The
M1
output
of
the
controller
energizes the compressor. The compressor
stays on until
the thermostat is satisfied, or
a
lockout
condition
occurs.
4.
4-Way Yalve Control
When
the thermostat calls
for cooling
on
the O terminal,
the
controller
energizes
its
O output to
send
control power
to
the 4-way reversing valve (VR)
to switch
the
refrigerant
circuit
to
the
cooling
mode.
5. Compressor Lockouts
A
compressor lockout
occurs
if
the high-pressure, low
pressure (in
the heating mode),
or freezeprotection
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
i
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 temperatwe problems
2.
Air flow
or temperatwe problems
3.Internal
heat
pump operation problems
4.
Cold
ambient air lemperature conditions
tlf
a
lockout condition
exists,
the heat pump should not
be reset more than once;
a service techniiian
should
be
called immediately.
VThe
cause of
rhe lockout
musr be
determined. Repeated reset
may
cause damage
to the
system.
6. Compressor
Anti-Short-Cycle
An
anti-short-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;
l.
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.
3If
the
compressor continuously
short cycles in
the
cooling
mode,
shut the
thermostat
off
and
call your
service technician.
7. System Diagnostics
The controller is equipped with
diagnostic
LED lights,
which
indicate
the system status at any
particular
time.
The lights
indicate
the
following
conditions:
l.24Yoltsystempower
GREEN
2.
Fault or
Lockout
YELLOW
3.
Anti-short-cycle
mode
RED
IX.
STARTUP
8.
Overflow Detection
An
optional overflow
detection
sensor may
be added to
the GeoSource
Vara.
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
for
an
anti-short-cycle period
of
approximately
3 minutes
and 35 seconds.
After
this time,
the heat
pump will
start again
if
the condensate
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 ceiting.
!9fore
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.
ii4ake
sure all
valves
are open and
air
has been
purged
from
a
closed loop
system. Never
operate the system
without
correct
water
flow.
l0
I
f