3-3
MEGA3 NFPA Medical Gas Notification System
4107 9016 59.02
3.3 NFPA Combination Wiring Diagram
Figur
e 34: W
iring Diagr
am f
or NFP
A MEGA3 Combination Alar
m
No
tes:
1.
MAIN DISC
ONNECT PR
O
VIDED B
Y O
THERS
2.
FIELD
PO
WER
WIRIN
G T
O BE C
OPPER R
ATED FOR 75°C MINIMUM
3.
FIELD SIGN
AL WIRIN
G T
O BE MINIMUM 22A
W
G
MUL
TI-C
ONDUCT
OR C
ABLE MUS
T BE T
WIS
TED P
AIR T
YPE WITH SHIELD
TO
TAL
C
IR
CUIT LEN
G
TH
N
O
T T
O EX
C
EED 10,000’ & MAX. 1K OHM RESIS
-
TA
N
C
E
4.
-- -- -- -- INDIC
ATES FIELD WIRIN
G OUT
SIDE OF B
O
X.
5.
SIGN
AL INPUT
S (UP T
O 8) FR
OM G
AS SENSOR MODULES.
6.
SIN
G
AL INPUT
S FR
OM DR
Y N
ORMALL
Y-C
LOSED C
ONT
ACT
S FR
OM SOUR
C
E
EQUIPMENT OR LINE PRESSURE S
WIT
C
HES.
7.
REL
AY OUTPUT C
ONT
ACT R
ATED 3A / 30VDC MAX.
8.
SEE MODULE L
ABEL T
O SET MODULE ADDRESS (POSITIONS 2,3, & 4). VERIFY
USIN
G T
ABLE 1.
9.
SET ADDRESS S
W
T POSITION 1 T
O “ON” FOR L
AS
T MODULE IN C
HAIN ONL
Y.
10.
AL
ARMS ARE C
ONFIGUR
ATION DEPENDENT
: AND MA
Y C
ONT
AIN EITHER
INPUT OR OUTPUT MODULES, OR B
O
TH.
FA
CT
OR
Y WIRED
C
HASSIS GR
OUND
EN
C
LOSURE
GR
OUND SC
REW
