DC ALARM CONNECTION AND
SOUND SIGNAL SELECTION
B.
T
w
o stage alarm
by Supply r
eversal
L
ine
m
onitor
ing by thr
eshold m
ethod (
<
1V)
Select
ala
rm sta
g
e 1 on SW1
Select
ala
rm sta
g
e 2 on SW2
Str
obe oper
ated
f
ro
m
separ
ate supply.
C. Two stage
alar
m by third core
Str
obe flashes for
both 1
st
and 2
nd
stages of
sound alar
m
.
L
ine
m
onitor
ing by suppl
y r
ever
sal
Select
ala
rm sta
g
e 1 on SW1
Select
ala
rm sta
g
e 2 on SW2
Co
m
m
o
n
su
pp
ly
to Sounder
and Str
obe
NO
TE:
Th
at
th
e two
s
tag
e con
trol
alwa
ys opera
tes a
s f
o
llows:-
Th
e fi
rst
st
age so
und
s b
y
s
upp
ly
ing
vol
ts
to a u
n
it
v
ia cont
ro
l
sw
it
ch
‘x
’, Thi
s
sw
it
ch
remain
s
o
n
and
th
e
se
co
nd
st
ag
e
sign
al
i
s
con
trol
le
d
b
y
s
w
it
chin
g
vo
lt
s t
o
t
h
e
th
ird
termin
al
vi
a
swi
tch
‘y’.
(O
n
o
th
e
r
si
d
e
o
f
P
C
B
)
S
o
u
n
d
S
el
ec
ti
o
n
(O
n
o
th
er
s
id
e
o
f
P
C
B
)
P
re
ss
u
re
U
n
it
C
o
n
n
ec
to
r
E
ar
th
C
o
n
n
ec
ti
o
n
4
TB
3
3
2
1
4
TB
2
3
2
1
4
3
2
TB
1
1
E
a
rt
h
L
K
2
(
li
n
k
2
4
v
d
c)
L
K
1
(
li
n
k
0
v
)
T
o
N
e
x
t
S
o
u
n
d
e
r
&
S
tr
o
b
e
x
y
S
o
u
n
d
e
r
&
S
tr
o
b
e
0
v
+
2
4
v
d
c
to
n
ex
t
st
ro
b
e
L
K
1
r
em
o
v
ed
(
li
n
k
0
v
)
0
v
+
2
4
v
d
c
(
st
ag
e
1
)
+
2
4
v
d
c
0
v
(
st
ag
e
2
)
S
tr
o
b
e
0
v
+
2
4
v
d
c
(O
n
o
th
er
s
id
e
o
f
P
C
B
)
(O
n
o
th
er
s
id
e
o
f
P
C
B
)
S
o
u
n
d
S
el
ec
ti
o
n
P
re
ss
u
re
U
n
it
C
o
n
n
ec
to
r
E
a
rt
h
C
o
n
n
e
ct
io
n
4
T
o
N
ex
t
S
o
u
n
d
er
2
3
TB
3
1
3
4
2
TB
2
L
K
2
r
em
o
v
ed
(
li
n
k
2
4
v
d
c)
TB
1
1
3
4
1
2
E
ar
th
D7292/12
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