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compressor contactor and begins the
time-out
of
the
time
delay (adjustable 10
to
1000
seconds
and
factory
set at
10).
After
the time-out, a
Y2 input
can
energtrze
the
2"d
compressor contactor.
eNote
-
Ensure there
is
always
a
delay
time
between
the
operation
of
the two
compressors
to
avoid
nuisance Iow-pressure
lockouts.
eNote
-
The
GW380
also has
compressor
motor
overload
protectors
mounted
direcfly
to
the compressors.
5.
Hydronic Circulator Pump Control
The hydronic circulator pump is
energized either
directly
with
the compressor contactor through the 3-pole
terminal
block (BP) or
through
an
isolation relay having
its 24Yac
coil
wired to
the
Y
and
X
terminals.
6.
zl-Way Yalve
Control
When 24Vac
is
applied
to
the
O
terminal
on
the
wi-ring
block, the controller
energizes
its O
output
to
provide
24Yac
power
to
the reversing valve
$IR), to
switch
the
refrigerant
circuit
to
the
cooling
mode.
7.
Compressor Lockouts
The
conffoller
will
lock
out the
compressor
if
either
the
high-pressure
(400
psig)
or
the low-pressure
switch
(10
psig on ground
loop or
35
psig on ground water)
opens.
A
lockout condition
means
that
the
unit
has
shut
itself
down
to
protect
itself,
and
will
not
come
back
on until
power
has
been disconaected
(via
the
circuit
breaker)
to
the
heat
punrp
for
one
minute. Problems that could
cause
a
lockout
situation include:
1.
Water
flow
or temperature problems
2.
Internal
heat
pump operation problems
3.
Cold
ambient air temperature conditions
tlf
a
lockout condition
exists, the
heat
pump
should
not
be reset
more than once;
and
a service
technician should
be
called immediately.
VCAUTION
-
Repeated reset
may
cause severe damage
to the
system and
may
void warranty.
The
cause
of
the
lockout
must
be
determined
and
corrected.
8.
System
Diagnostics
The
controller
is equipped
with
diagnostic
LED
lights
that
indicate
the
system status
at
any particular
time.
The
lights
indicate
the
following
conditions:
1.24Yolt
system
power
GREEN
2.Faultor
l,ockout
YELLOW
3.
Anti-short-cycle
mode
RED
If
a
room
thermostat
is
installed
with the
heat
pump
system and has
a
lockout indicator, the controller
will
send a
signal
from
L
on
the
terminal
strip
to
a
LED
on
the
thermostat to indicate
a
lockout condition.
9.
24
Vac
Fuse
The
controller has
a
glass-cartridge
fuse located
on
the
circuit
board adjacent
to
the
24Yac
power
connector. The
green
system
power
LED
will
be
off
if
this
fuse
is
open.
A
spare fuse
is located
in
the
saddle attached
to
the side
of
T2
the 24Yac power connector, and the GW380
also has
a
miniature rocker-type
circuit
breaker located
on
the
divider-wall
in
the electrical
box.
eNote
-
Ensure
the
new fuse
fits
tightly
in
the
fuse
clips
after replacement.
10.
Plug Accessory (PA)
The
Plry
Accessory
output
is intemally
connected
to
the
Ml
output and
is
energized whenever
Ml
turns
on
the
compressor contactor. The
maximum rating of this output
is
10VA
sealed and
20VA
inrush
and
is
typically
intended
to power
a24Yac
ground water solenoid valve.
LL.
Alarm Output
This
output
is a
2-position screw terminal
connector
identified
as
"Fault Test"
on the controller board
and
as
DO
on the
wiring
diagram.
It
is
an
isolated
dry
confract
output
(0.1 ohm resistance) that
closes
during
a
controller
lockout
and
is
intended
for
use as an
input
to
a dial-out
type
of monitoring
system.
The
maximum
electrical
rating
is
2mA
up
to
30Vac or
50mA
up to
40Vdc.
IX.
STARTUP
/
CHECKOUT
Before 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. Make
sure
all
valves
are open
and
air
has
been
purged
from a loop
system. Never
operate
the
system
without
correct water supply
flow
on either the qround
side
or
the
hlidronic
side.
-
A11
high
voltage
and
all low
voltage
wiring is
correct
aad
checked
out, including wire
sizes,
fuses
and
breakers,
Set system
to the
"OFF" position.
-
The
heat
pump is located
in
a
warm
area (above 451F).
(Starting
the
system
with low
ambient
temperature
conditions
is
more
dfficult.) Do not
leave
the
area
until
the
space
is
brought up to operating
temperatures.
-
Hydronic
side water
temperatures
are
warm
enough
(50"F or
above)
to
start
in
the
heating
mode.
Apply
power
to
the
unit.
A 4
minute 35
second
delay
on
power
up
is
programmed
into
the
controller
before
the
compressor
will
operate.
During this time,
the
pump
relay
will
energize
the hydronic side-circulating pump.
Verify
the
flow
rate
and
temperature
of
the
hydronic
side
flow.
The
following
steps
will
ensure
the
system
is
heating
and
cooling properly.
After
the
initial
time-out period,
the
red
indicator
light on
the
controller
will
shut
off.
The
heat
pump is now ready
for
operation.
-
Tum the
heating setpoint
to its
highest
temperature
setting, and place
the
system
to run
in
heating.
The
compressor
should
start
I
to 2
seconds
later.
If
an
electronic thermostat
is
used,
it
may
cause
its
own
compressor delay
at
this time, but
the compressor
will
come
on after
the
time-out period.
-
After
5
minutes
of
heating operation, check
hydronic-
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