1
OVERVIEW
A Burg Module is required for UL Combination Burglary and Fire
and Burglary-only installations to provide a separate, isolated bus
for burglary keypad(s) that are required for annunciation and other
burglary/access control peripheral devices.
The GEMC-BM/PS module isolates the Burglary system from the
Fire system for the more demanding authority having jurisdiction.
Battery calculations are simplified for the Fire system because the
Burglary portion of the system cannot affect the required Fire
standby time, making the system more compliant with the intent of
NFPA72. For UL Commercial installations, the unit is to be housed
in an attack-resistant enclosure, such as the GEMC-HSKIT1425 or
GEMC-HSKIT1416, employed with the GEMC-TAMPERKIT. See
WI1653 for the Gemini C-Series installation instructions.
Two Burg Module Options
There are two types of Burg Modules. Both provide the same Bur-
glary and access control features, however, the voltage and current
ratings for each are different, requiring different power calculations
depending on system back-up battery configurations. The two
types of Burg Modules are as follows:
• GEMC-BM/PS Burg Module with 24V to 12V converter and
back-up 12V, 8AH max battery charger with monitor circuit
• GEMC-BM Burg Module without power supply; utilizes the Fire
system batteries (see WI1701)
SPECIFICATIONS
Electrical Ratings
Input Power: 24V, 25mA standby from motherboard plus 0.6 multi-
plied by the "Total Combined Standby and Alarm Current".
Output Power:
Burg Bell Power: 10.8 - 12.5VDC, 2A maximum.
AUX Power: 11.3 - 12.5VDC, 750mA maximum.
Burg Bus Power ("Remote Bus Power"): 11.2 - 12.5VDC,
750mA maximum.
PGM1: Active low, 8.2 - 12.0V @ 150mA.
PGM2: Active low, 8.2 - 12.0V @ 150mA.
Aux Relay: Wet 11.2 - 12.5VDC @ 750mA maximum (subtract
from AUX Power); may be set to a dry form "c" relay contact
upon removing or cutting the jumper "R"; output rated 30VAC/
DC, 3A (Resistive Load Only)
Total Combined Standby Current (Auxiliary Power + Burg Bus
power + Aux Relay power): 750mA.
Total Combined Standby and Alarm Current (Auxiliary power +
Burg Bus power + Aux Relay power + Bell power): 2.5A.
Battery Options:
• One 12V 4AH battery: Maximum standby 500mA + maximum
alarm 1A = total 1.5A.
• One 12V 7AH or 8AH battery: Maximum standby 750mA +
maximum alarm 1.75A = total 2.5A.
Maximum Battery Charging Current: 1A.
Note: Does not affect GEMC-XXXMB standby battery calculations,
as all standby current is from dedicated battery. Maximum GEMC-
XXXMB combined alarm and standby current must be reduced by
0.6 times the combined alarm and standby current of the GEMC-
BM/PS plus 25mA.
GEMC-BM/PS DESCRIPTION
Burg Module with Power Supply & Battery
The GEMC-BM/PS module has an integral power supply. In addi-
tion, an integral low battery disconnect feature protects the battery
during an extended power failure by disconnecting at approximately
9.5V. This integral low battery disconnect feature allows the charg-
ing circuit to recharge the batteries after an AC failure within 24
hours as required for Mercantile Burglary.
• During AC fail, the Burglary module and all peripherals are sup-
ported until battery disconnect circuit activates at about 9.3V.
The Fire standby batteries are not affected and only support the
Fire system.
• Battery is separately monitored with a 4 hour active battery test.
INSTALLATION
The GEMC-BM/PS is pre-assembled at the factory with two sup-
port bars as shown in the following image:
1. Connect the Burglary Module battery wires: See image
above. The red (+) wire (part # W1004-1) is double-insulated for
added electrical isolation. Connect the black (ground) wire (part #
W1004-2) to the negative (–) terminal E2. Connect the red (12V)
wire to the positive (+) terminal E1. Route wires behind the PCB
and secure with a wire tie as shown in the image below:
2. Place the Burglary Module PCB on top of the Support Bars and
secure using the 6-32 screws (item #6) and external tooth star
washers (item #5).
R
333 Bayview Avenue
Amityville, New York 11701
For Sales and Repairs, (800) 645-9445
For Technical Service, (800) 645-9440
Publicly traded on NASDAQ Symbol: NSSC
© NAPCO 2010 WI1700 06/10
NAPCO GEMINI C-SERIES
GEMC-BM / PS
BURGLARY MODULE WITH POWER SUPPLY
INSTALLATION INSTRUCTIONS
ROUTE WIRES BEHIND THE GEMC-BM / PS
PRE-ASSEMBLED GEMC-BM / PS BURG MODULE. LOCATION OF
BATTERY CONNECTOR SHOWN IN CLOSE-UP
RED
(+)
BLACK
(–)
(4 pages)
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