Heat Pumps; Thermostat; Lights; Controller - Econar GeoSurce Vara 2 Plus GV Series Lnstallation And Operating Lnstructions

separate transformer
must be used.
The
heat
pump's
transformer
can
generally power
simple external control
systems consisting of
a
few
relays or
a zone
valve
(depending,
of
course, on the
VA
draw
of
the
components).
On more complicated conffol
systems the
transformer's capacity is
used up very
quickly.
B. Thermostat
A
3-heat/2-cool thermostat, ECONAR
part number
70-2019,
is
included with
every GeoSource
Yara
2
TM
Plus
heat
pump.
This thermostat controls all
stages
of
operation
of
the heat
pump.
Initiation of
each stage is
implemented
based on the recovery rate of
the actual
temperature to the
set
point
temperature. This
means
that
switching to
a
higher
stage
will
require time
(sometimes
15
minutes or more) for
the
thermostat to calculate rate of
change. Consult
the
instructions in
the thermostat box
for
proper mounting
and
operation.
Be careful to
select
a
thermostat location
where external temperature
sources
will
not affect
sensed temperature.
V ClUffON-
miswiring of conffol
voltage on
sysrem
controls
can
result in
fuse
or transformer burnout.
eNote:
If
a single thermostat controls multiple
heat
pumps,
the
control wiring of
the heat
pumps must
be
isolated from
each
other. This
will
prevent
the heat
pumps from
receiving high voltage through
the common
wiring
if it
is lurned off
at the
circuit
breaker
for
service.
1.
Wiring
Thermostat cable with
at least nine conductors
must be
run from
the heat
pump to
the
thermostat.
Power is
supplied to
the thermostat by connecting
the R
and
X
(C)
terminals to
the heat
pump
terminal strip.
The
G
terminal
from
the thermostat
initiates
the
blower's
sequences. The
Yl
terminal
energizes the
frst
stage operation,
and the
y2
terminal
energizes the second stage operation.
The
unit
is
put into
the
cooling
mode when
the
thermostat
energizes
the
O terminal, which
operates the 4-way reversing valve.
The
Wl
(W2)
terminal
energizes the electric
elements
for
third
stage
heating. The L
terminal in
connected to
an
LED
on the
thermostat.
The E terminal
energizes the
electric
elements
for
Emergency Heat.
These connections
are listed in Table
5.
Table
5
-
Connections
2.
Lights
The
L
terminal
on the heat pump, wired to
the
L terminal
on
the
thermostat,
will light
the
right
"lockout,'light;
indicating
the
controller
is
in lockout mode. If
this
occurs, please
see the section
titled
"Compressor
Lockouts."
In
addition,
the
conffoller
has
a set
ofdry
contacts, which
are closed
in
the event
ofunit lockout.
This contact
closure can be used by
a securify
system or central
monitoring
system to
notify of
a
lockout.
C.
Controller
The
controller
receives
a
signal from
the thermostat
and
initiates
the
correct
sequence
ofoperations for
the heat
pump.
The controller performs
the
following
functions:
1)
ECM Blower
Operation and Speed Control
2)
Earth
Loop
Pump Initiarion
3)
Compressor Operation for
1't Stage Heat/Cool
4)
Compressor Operation for
2nd
Stage Heat/Cool
5)
Electric Element Operation
6)
4-Way Valve Control
7)
Compressor Lockouts
8)
CompressorAnti-ShorrCycle
9)
System Diagnostics
1.
ECM Blower Operation
and Speed
Control
A
signal
on the G terminal
from
the thermostat to
the
controller
will tell
the
conftoller
to
energize the blower.
A
G signal
alone
puts
the
motor in low
speed
operation.
If
the
thermostat
sends a G and
Yl
signal to
the
conffoller
for
1't
stage
operation,
the
controller
bumps
t}le blower
speed
up to
Medium-Low.
When
the thermostat
sends
a
G,
Yl,
andY2
signal
for
2'd stage operation,
the
controller.bumps
the
blower
speed up
to Medium-High.
A
Wl
(3'd
stage
heat) or E (Emergeniy
heat) signal
from
the
thermostat
energizes the
blower in High
speed.
These
system configurations
are tabled in Table
2.
To
change
blower
speeds,
move
the
pin
jumper
labeled
"Adjust"
from its
existing
location
to either the ..+"
or
..-,.
tap.
This
will
adjust
the
airflow
either up or down
by
l07o of
the
factory setting.
The pin
jumpers in
the
Low,
Medium,
and
High
settings should not
be
moved from
the
factory
setting.
2.
B;afih Loop Pump Initiation
If
a
PumpPAKrM is
used,
it
should
be wired directly
to the
compressor
side
of
the
contactor. If
a
PumpPAKrM
is
not
used,
a separate
pump
can be used which
is energized
with
a
pump
relay
(Note:
elecffical
code
will
require
a
fused disconnect for pumps other
than
PumppAKsru).
When
there is
a
call
for
an
M1
output from
the
controller,
the
contactor
will
energize, starting
the
compressor
and
earth
loop pump.
24
Volt
Power
R R
Common
x
c (x)
Blower
G
G
Valve
o o
Heat / Cool Y
Y1
2nd
Stage
Heat / Cool
Y2
Y2
Lockout
Signal
L
L
3'o Stage
Heat
w2
w1
Emergency Heat
E E
10
I