2-5
MEGA3 NFPA Medical Gas Notification System
4107 9016 59.03
WARNING
:
RISK OF ELECTRIC SHOCK
Disconnect power at the circuit breaker
before removing power supply shield.
For NFPA 99 compliance, alarm panel must
be connected to life safety branch of the
emergency electrical system.
1. Remove four screws from plastic power
supply shield.
2. Remove plastic shield from power supply.
3. Connect incoming line and neutral wires
to the terminal block. Ground wire con-
nects directly to the rough-in box (chassis)
at the green screw below the power sup-
ply (Figure 21).
4. DO NOT remove or alter the Green facto-
ry installed ground wire from the terminal
block to chassis.
5. Reinstall plastic power supply shield
while making sure all high voltage wires
are contained within plastic shield.
6. Secure plastic shield with four screws.
2.3.5 B60 Gas Input Board
An Area alarm has 8 Gas Inputs. Signals are
numbered D01 thru D08. There is a single
relay output for general gas fault notification.
1. Identify each pair of twisted gas sensor
wires inside the alarm rough-in box.
2. Route each pair of sensor wires as shown
(Figure 23) to appropriate terminals.
3. Connect each pair of sensor wires to
terminal blocks noting the correct polar-
ity Red (+), Black (-).
NFPA Area Wiring
Diagram (Section 3.2)
Figure 22: Remote Sensor Wire Routing
Holes provided for
entrance of remote
wiring
Figure 21: Supply Power Wiring
Line Voltage
Neutral
Ground
NOTE
:
If gas sensor wires are landed on the terminal blocks
in the same order as defined by the model number
of the alarm panel, then initial setup will be easier
and gas sensor channels will not need to be recon-
figured.” Example T3-A10-OAV means “O” Oxygen
is defaulted to D01, “A” Medical Air is defaulted to
D02, etc. See Section 1.6.
