DC ALARM CONNECTION AND
SOUND SIGNAL SELECTION
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’.
E.
Single stage ala
rm
L
ine
m
onitor
ing by suppl
y r
ever
sal
Select
ala
rm sta
g
e 1 on SW1
Str
obe
shown
w
ith
comm
on
0v,
with
Sounder
D. T
w
o stage ala
rm by Thi
rd core
Stro
b
e f
lash
es f
o
r 2
nd
stage of
sou
nd alar
m
, link T
B2
/3 to T
B1/2
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.
(O
n
o
th
er
s
id
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
L
K
2
r
em
o
v
ed
(
li
n
k
2
4
v
d
c)
1
4
3
2
TB
1
1
E
ar
th
L
K
1
(
li
n
k
0
v
)
T
o
N
ex
t
S
o
u
n
d
er
x
to
n
ex
t
st
ro
b
e
0
v
S
o
u
n
d
er
&
S
tr
o
b
e
S
o
u
n
d
er
+
2
4
v
d
c
S
tr
o
b
e
+
2
4
v
d
c
(O
n
o
th
er
s
id
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
L
K
2
r
em
o
v
ed
(
li
n
k
2
4
v
d
c)
1
4
3
2
TB
1
1
E
ar
th
L
K
1
(
li
n
k
0
v
)
T
o
N
ex
t
S
o
u
n
d
er
&
S
tr
o
b
e
x
y
0
v
+
2
4
v
d
c
D7292/12
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