3-3
MEGA3 NFPA Medical Gas Notification System
4107 9016 59.02
3.3 NFPA Combination Wiring Diagram
Figure 34: Wiring Diagram for NFPA MEGA3 Combination Alarm
Notes:
1. MAIN DISCONNECT PROVIDED BY OTHERS
2. FIELD POWER WIRING TO BE COPPER RATED FOR 75°C MINIMUM
3. FIELD SIGNAL WIRING TO BE MINIMUM 22AWG
MULTI-CONDUCTOR CABLE MUST BE TWISTED PAIR TYPE WITH SHIELD
TOTAL CIRCUIT LENGTH NOT TO EXCEED 10,000’ & MAX. 1K OHM RESIS-
TANCE
4. -- -- -- -- INDICATES FIELD WIRING OUTSIDE OF BOX.
5. SIGNAL INPUTS (UP TO 8) FROM GAS SENSOR MODULES.
6. SINGAL INPUTS FROM DRY NORMALLY-CLOSED CONTACTS FROM SOURCE
EQUIPMENT OR LINE PRESSURE SWITCHES.
7. RELAY OUTPUT CONTACT RATED 3A / 30VDC MAX.
8. SEE MODULE LABEL TO SET MODULE ADDRESS (POSITIONS 2,3, & 4). VERIFY
USING TABLE 1.
9. SET ADDRESS SWT POSITION 1 TO “ON” FOR LAST MODULE IN CHAIN ONLY.
10. ALARMS ARE CONFIGURATION DEPENDENT: AND MAY CONTAIN EITHER
INPUT OR OUTPUT MODULES, OR BOTH.
FACTORY WIRED
CHASSIS GROUND
ENCLOSURE
GROUND SCREW
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