+12V
S
ALARM
NC COM NO
XX
X
ALARM RELAY
LOCATION ON
MASTER PCB
SECTION DETAIL MASTER PCB
ALARM
RELAY
DETAIL
The
Nucleus
Electrical
Control
Board
has
one
Alarm
Relay
Circuit.
See
Master
PCB
location
above.
The
alarm
relay
is
rated
for
the
following:
30
Volts
DC,
2A
Max,
60W,
NO
Only,
SELV,
LPS
or
Class
2
The
alarm
relay
is
only
activated
based
on
input
from
the
primary
RTD
temperature
probe
on
the
mixed
water
outlet
(T3).
The
alarm
has
a
preset
default
MIN
(65°F)
and
MAX
(130°F)
in
the
commissioning
menu,
and
it
will
activate
on
measured
temperature
values
of
T3
above
or
below
these
MIN
/
MAX
values.
The
above
values
are
user
adjustable
and
programmable
in
the
commissioning
menu.
See
COMMISSIONING
section
in
this
manual,
starting
on
page
13.
Once
alarm
has
been
triggered,
the
error
must
be
manually
cleared
from
the
LCD
screen
by
pressing
ENTER.
If
alarm
condition
is
still
present,
the
TTML
(page
15)
begins
and
alarm
is
re
‐
triggered
after
TTML
has
elapsed.
This
process
can
continue
until
outlet
temperature
is
within
the
MIN
/
MAX
parameters.
The
alarm
will
be
de
‐
activated
as
soon
as
the
measured
temperature
value
at
T3
returns
to
a
measured
value
between
MIN
and
MAX
.
When
in
a
non
‐
alarm
state,
the
relay
is
in
a
Normally
Closed
(NC)
position.
When
the
alarm
is
triggered,
the
relay
switches
to
a
Normally
Opened
(NO)
position.
MASTER
PCB
DETAILS
The
Primary
PCB
for
this
device
comes
with
the
following
connectivity:
1.
Linear
motor
connection
for
valve
motion.
2.
Four
standard
temperature
input
channels
– T1,
T2,
T3,
T4
– all
are
3
‐
wire
RTD
connection
types.
3.
Two
standard
pressure
input
channels
– P1
&
P2
The
Primary
PCB
also
has
the
ability
to
receive
a
plug
‐
in
protocessor
for
standard
industry
protocols
(6
native
on
board)
and
communication
to
a
Building
Management
System
via
Ethernet
or
RS
‐
485.
27
