Full Text Searchable PDF User Manual
Guardian
-
System Monitor and Speed Control
Description:
The
Coastal
Guardian
comprises
a
panel
measuring
5”w
x
2”h
that
incorporates
a
Coastal
MK
II
Digital
Thermostat/
Thermometer,
a
compressor
speed
adjustment
knob,
and
a
diagnostic
fault
LED.
The
panel
is
supplied
with
a
10’
thermostat
sensor
and
a
10’
control
cable
that
connects
to
a
Danfoss
compressor
controller.
If
a
Merlin
SSC
is
installed
on
the
compressor
controller,
“AUTO”
setting
will
give
automatic
speed
control,
otherwise
there
will
be
no
automatic
speed
control
capability.
A
Power
Terminal
Multiplier
circuit
board
is
included
to
facilitate
easy
power
connections
to
the
Danfoss
controller,
and
a
2
amp
in
‐
line
fuse
is
installed
in
the
positive
power
feed
wire.
Standard
model
is
for
operation
on
12v
power
supplies
only.
24v
versions
available
on
request.
Location:
The
panel
is
designed
to
be
mounted
on
a
vertical
surface,
secured
by
the
four
screws
provided.
Care
must
be
taken
to
ensure
that
the
location
chosen
will
not
subject
the
panel
or
its
components
to
splashing
or
running
water,
steam,
corrosive
gasses,
excessive
vibration,
or
physical
damage.
Ideally
the
location
will
allow
the
10’
thermostat
sensor
and
control
cable
to
be
installed
without
being
extended.
If
it
is
necessary
to
extend
either
cable,
the
electrical
joints
should
be
soldered.
The
panel
requires
a
cut
‐
out
measuring
4.5”
x
1.5”,
and
a
depth
of
3”.
Installation:
The
Power
Terminal
Multiplier
is
to
be
installed
on
the
top
two
terminals
of
the
Danfoss
controller.
This
provides
two
sets
of
+
and
–
terminals:
one
set
for
the
incoming
12v
power
feed
from
the
distribution
panel
via
a
breaker,
and
one
for
the
power
supply
to
the
Guardian
.
Ensure
that
the
female
connectors
on
the
Power
Terminal
Multiplier
mate
correctly
with
the
male
pins.
The
Guardian
panel
is
then
mounted
and
secured
and
the
thermostat
sensor
and
control
cables
run
to
their
respective
locations.
The
control
wires
connect
to
the
Danfoss
controller
as
shown
below.
The
thermostat
sensor
should
ideally
be
located
at
mid
‐
height
in
the
box,
and
not
on
a
wall
that
has
any
portion
of
an
evaporator
mounted
on
it.
The
sensor
should
be
isolated
from
the
box
wall
with
a
plastic
tie
or
similar.
Wiring:
T
P
C
D
F
+
+
12v
or
24v
Power
Supply
input
12v
switched
output
for
Fan
or
Pump
Relay
Danfoss
Standard
101N0210 Compressor
Controller
Cable
to
Guardian
panel
Power
Terminal
Multiplier
Black
Red
Green
Blue
Orange
Over:
Brown
White
Note
1
Note
2
NOTES:
1
–
If
Merlin
SSC
fitted,
Blue
and
Orange
wires
plug
on
to
“C”
and
“T”
on
Merlin
.
2
–
Brown
and
White
wires
are
spare
and
not
used
on
standard
installations.
These
may
be
used
as
switched
wires
from
a
second
digital
thermostat
for
a
spillover
fan,
etc.
Fuse
Guardian - Operation
Operation:
The
Coastal
Guardian
performs
three
functions:
1.
Controls
and
displays
refrigerator
or
freezer
box
temperature
and
compressor
operational
status.
2.
Provides
for
automatic
or
manual
compressor
speed
control
for
maximum
possible
system
efficiency.
3.
Gives
audible
and
visual
indication
of
temperature
anomalies
and
system
malfunction.
1.
The
Coastal
MK
II
Digital
Thermostat/Thermometer
is
pre
‐
installed
and
set
to
work
as
a
refrigerator
control
with
a
set
point
of
40
degrees
Fahrenheit.
Refer
to
separate
instruction
sheet
for
details
on
how
to
adjust
temperature
set
point,
differential,
temperature
scale
(F
or
C),
and
alarm
thresholds.
2.
Compressor
speed
is
controlled
by
adjusting
the
rotary
knob.
When
in
the
“AUTO”
position
and
with
Merlin
Smart
Speed
Controller
installed,
the
compressor
will
automatically
run
at
the
most
efficient
speed,
and
changing
the
knob
position
during
that
cycle
will
have
no
effect.
If
a
manual
speed
is
set,
the
compressor
will
run
at
that
speed
on
the
next
start
‐
up.
Without
Merlin
SSC
installed,
the
“AUTO”
setting
is
non
‐
operational
and
will
become
the
lowest
speed
setting.
The
lowest
speed
should
be
set
so
that:
(a)
the
box
maintains
the
desired
temperature,
and
(b)
the
compressor
runs
for
between
30
and
45
minutes
in
the
hour.
The
principle
behind
controlling
compressor
speed
being
that
the
longer
and
slower
a
compressor
can
be
run,
the
more
efficient
it
will
be
and
the
less
power
it
will
consume
overall.
3.
The
Diagnostic
LED
,
labeled
“FAULT”,
will
display
a
flashing
error
code
of
between
one
and
five
flashes
dependent
on
the
nature
of
the
fault,
as
listed
below.
Each
flashing
error
code
cycle
is
repeated
every
4
seconds.
When
a
fault
is
detected,
the
compressor
will
stop
but
the
fan
or
water
pump,
if
applicable,
will
continue
to
run.
A
re
‐
start
will
be
attempted
approximately
every
60
‐
90
seconds.
The
fan
or
water
pump
will
stop
during
restart
attempts.
One
Flash
–
Indicates
low
voltage.
Voltage
at
terminals
on
the
Danfoss
controller
has
dropped
to
less
than
10.4v.
Voltage
must
then
rise
above
the
cut
‐
in
voltage
of
11.7v
before
the
compressor
will
attempt
a
re
‐
start.
NOTE:
If
initial
power
applied
at
start
‐
up
is
less
than
11.8
volts:
No
code
flashing
on
the
diagnostic
LED,
thermostat
digital
display
will
be
lit,
but
the
compressor
will
not
start
until
the
voltage
has
risen
above
11.8
volts.
Two
Flashes
‐
Indicates
an
overload
on
the
Fan
output.
The
fan
output
cannot
support
an
average
load
greater
than
0.5
amp,
or
a
peak
load
greater
than
1
amp
for
two
seconds.
Three
Flashes
–
Indicates
that
the
compressor
cannot
start
due
to
too
high
a
differential
pressure
in
the
compressor.
This
is
a
common
problem
where
poor
voltage,
or
breaks
in
the
power
supply
or
thermostat
wiring
cause
the
controller
to
attempt
a
compressor
re
‐
start
too
soon
after
it
has
been
stopped
for
some
reason.
Four
Flashes
–
Indicates
that
the
compressor
cannot
reach
minimum
speed
of
1,850
RPM.
Five
Flashes
–
Indicates
that
the
electronics
heat
sink
has
exceeded
212
deg
F
(100
deg
C).
This
can
be
due
to
an
overcharge
of
refrigerant,
water
in
the
system,
or
excessive
ambient
temperatures
combined
with
a
compressor
operating
under
extreme
load.
A
re
‐
start
will
be
attempted
when
heat
sink
has
cooled
to
170
deg
F
(80
deg
C).
PO
Box
4535
Annapolis
MD
21403
USA
–
www.frigoboat.com
–
info@frigoboat.com
–
301
‐
352
‐
5738