56
Johnson Controls, Inc. SLC Wiring Manual —
P/N 51870:G 04/23/2009
Power Considerations
Supervising 24 VDC Power
A.2.3 Using the Addressable Control Module Without Relay
An alternate method of supervising 24 VDC power fed to the Notification Appliance Circuit of the
M300CJ module eliminates the need for a power supervision relay. This method uses a Notification
Appliance Circuit from the control panel or power supply to supply power to the M300CJ modules.
The control panel supervises this circuit, which can be either a Style Y or Style Z.
Style Y NAC Power Wiring
Program the NAC from the control panel for general alarm. (Refer to the programming manual or
programming section of the FACP documentation for instructions.) Note that if the NAC is a coded
output, the M300CJ output will be coded as well.
Refer to the
Device Compatibility Document
for compatible notification appliances.
•
The circuit is supervised and power-limited.
•
In this circuit, an external ELR
is
required at end of the NAC circuit.
•
Refer to the respective control panel installation manual for NAC terminal block connection
information and ELR value.
•
Remove internal resistor on each M300CJ (see instructions in Figure 7.2 on page 42).
Connect the NAC power as follows:
Figure A.3 NFPA Style Y NAC Power (Alternate)
M300CJ
Note: Drawing shows power wiring
only; SLC Wiring not shown.
S
L
C
-na
c
Y
1t
p
H
.w
mf
NAC Terminal Block (24 VDC)
M300CJ
Circuit supervised
by control panel
