NAPCO GEMC-NAC7L User manual

Gemini C-Series GEMC-NAC Extender Installation Instructions 1
OVERVIEW
The GEMC-NAC7S or GEMC-NAC7L (referred to as "GEMC-NACXX" throughout this manual) can be used as either:
•A UL864 9th edition accessory to a Gemini C-Series Combination Fire & Burglary Alarm control panel
--or--
•A UL864 9th edition NAC Extender for use with any listed Fire Alarm Control Panel (FACP)
The dual nature of the GEMC-NACXX requires this manual be divided into two individual sections: When the GEMC-
NACXX is used with the Gemini C-Series control panels, proceed to the next section named "GEMINI C-SERIES OP-
ERATION" directly below. When used with a listed Fire Alarm Control Panel as a stand-alone NAC Extender, stop here
and turn to page 21.
GEMINI C-SERIES OPERATION
GEMC-NAC7L / GEMC-NAC7S
SUPERVISED NAC EXTENDER
INSTALLATION INSTRUCTIONS
R
333 Bayview Avenue
Amityville, New York 11701
For Sales and Repairs, [phone]
For Technical Service, [phone]
Publicly traded on NASDAQ Symbol: NSSC
© NAPCO 2010 WI1821 08/10
The GEMC 7-Ampere NAC Extender includes 2 models: The GEMC-NAC7L (used with the large enclosure) and GEMC-
NAC7S (used with the small enclosure).
Notification Appliance Circuits (NAC's)
A Notification Appliance Circuit is a circuit or path directly connected to a notification appliance, i.e. any audible, tactile or
visual signal--or any combination thereof--employed to indicate a fire, supervisory or trouble condition.
The Gemini C-Series control panels comply with National Fire Protection Association (NFPA) requirements for temporal
pulse sounding of fire notification appliances. Use only the specified UL Listed notification appliances. Note: For IN-
DOOR / DRY LOCATION USE ONLY.
INTRODUCTION
When used with a Gemini C-Series control panel, the
GEMC-NACXX functions as if it were two separate mod-
ules, an External Output ("Fire NAC Extender" board)
with 7 of the 8 outputs utilized (the first 4 supervised) and
a 4-Zone EZM (Expansion Zone Module) used to send
the status of a device (AC ON/OFF, BATTERY GOOD/
TBL, GROUND FAULT and TAMPER) to the C-Series
control panel.
The GEMC-NACXX is wired to the 4-wire fire bus of the
C-Series control panel, and provides:
•4-Supervised Outputs suitable as 24V, maximum 2A
each, combined 6.5A maximum regulated Notification
Appliance Circuits. These outputs can be configured
as:
•4 Class B or
•1 Class A and 2 Class B or
•2 Class A
•3-Unsupervised Form-C Dry relay outputs activated by
a programmed event generated by the Gemini C-Series
control panel (the 8th output is not used)
•One supervised, isolated GEMC-Remote Bus interface
•One normally-closed (N/C) housing tamper input, identi-
fied by trouble on dedicated integral EZM zone
•Isolated integral ground-fault detection circuit (detects
1.25KΩto ground or less)
•One isolated input (terminals 1-2) to synchronize
"Smart" outputs (Listed Wheelock or System Sensor
horns/strobes) with other outputs from the C-Series
motherboard or other GEMC-NACXX devices
●Power supply contains integral battery charger capable
of charging up to 4 pairs of 7AH / 7.5AH / 8AH sealed
lead acid or gel type 12V batteries. Note: All batteries
must be of the same AH rating.
●The system monitors for low battery, no battery, brown-
out and monitors battery charging circuit voltage, identi-
fied by battery trouble on dedicated integral EZM zone
•Remote bus interface and two Inputs are isolated, thus
allowing for separate ground fault detection and annun-
ciation
●Allows audible notification appliances (horns) to be si-
lenced while visual notification appliances (strobes)
continue to operate
●Input allows synchronized Wheelock/System Sensor
operation between the motherboard or other C-Series
NAC circuits, allowing for multiple NAC circuits to be
used within the same area
●Each of the 4 NAC circuits are individually supervised
for opens or shorts, and will annunciate and report
separately
●Solid State over-current protection on the four NAC's

2 Gemini C-Series GEMC-NAC Extender Installation Instructions
●The maximum number of GEMC-NACXX's can be used
on a Gemini C-Series control panel is five (5), thus allow-
ing for a maximum of 20 additional NAC circuits
●Surface/semi-flush cabinet included
●Automatic switchover to stand-by battery when AC Fails
●When configured for 24V Auxiliary Power, it is a Special
Application output only listed with the GEMC-24VR. The
GEMC-24VR output is Regulated 24VDC, 1A maximum.
SPECIFICATIONS
Electrical Ratings
Input Power:
Primary input power: 120VAC, 50/60Hz, 3A, maximum
15A dedicated branch circuit.
Secondary power: 24V operation, up to eight 12V /
7AH / 7.5AH / 8AH batteries in pairs (7AH-32AH
standby).
Fire Bus Input Power Rating: 12.0V Nominal, 8mA.
Output Power:
Total Output Power: 24VDC, 7A maximum, power lim-
ited outputs. Each NAC circuit output rated @ 2A maxi-
mum.
Optional Auxiliary Output Power: 2A maximum per cir-
cuit in alarm; 1.1A @ 24V maximum standby current
(depending on batteries utilized) for 24 hours. Any of the
4 NAC's can be used for auxiliary outputs by program-
ming the output with the feature "Reverse Polarity" (see
the "NAC/Output Assignment" screen in PCD-Windows
Quickloader software). Auxiliary power is 24V Special
Applications for use with the GEMC-24VR; these auxiliary
outputs are then 24V Regulated.
Supervision:
●AC fail supervision local annunciation, approximate 1
minute delay to prevent nuisance swingers
●Battery presence, low battery supervision and battery
charger voltage supervision; combined to generate a
common battery trouble
●Remote bus supervised for opens, shorts or ground faults
Additional GEMC-NACXX Specifications:
NAC End-of-Line Resistor: 2.2K ohms (NAPCO
EOL2.2K).
Common Trouble Relay ("Out Relay 5"): 30VDC @
1A, 30VAC @ .5A Resistive, connect to power limited cir-
cuits only.
Common Trouble Relay ("Out Relay 6"): 30VDC @
1A, 30VAC @ .5A Resistive, connect to power limited cir-
cuits only.
Common Trouble Relay ("Out Relay 7"): 10A /
120VAC; 2.5A / 30VAC / DC Resistive Load.
Input control circuit: 10-30VDC @ 20mA maximum.
Operating Temperature: 32°F to 120°F (0°C to 49°C).
Operating Humidity: Maximum 85% relative humidity @
30°C.
Housing
The GEMC-NACXX comes complete with 7A power supply,
enclosure and ample room for standby batteries. Two mod-
els are available, as determined by the size of the enclo-
sure:
Enclosure Dimensions (W x H x D, Inches):
•The GEMC-NAC7S uses the small housing with suffi-
cient room for two pair of 12V standby batteries (model
GEMC-HSKIT1416, size 14.25" x 16" x 5.25")
•The GEMC-NAC7L uses the large housing with room
for four pairs of 12V standby batteries (model GEMC-
HSKIT1425, size 14.25" x 24" x 5.25")
Programming
When used with a Gemini C-Series control panel, the
GEMC-NACXX must be programmed using PCD-Windows
Quickloader download software, and the GEMC-NACXX
PC board must be configured correctly with its jumper op-
tions. For Programming, turn to page 6.
AGENCY LISTINGS:
●UL Listed Control Units and Accessories for Fire Alarm
Systems (UL864 9th edition)*
●CSFM - California State Fire Marshal Approved*
●NFPA 72 compliant
*pending
# Name Description (Patterns repeat until condition is
cleared)
00 Constant Continuous Sound (Note: This is the only pattern that can
be used for relay circuits).
01 March Code
02 ANSI 3.41
03 Single Stroke
04 California
C-Series Programmable Cadence Options
5 seconds on
5 seconds on
5 seconds on 10 seconds off
.5 seconds off
1.5 seconds off
.5 seconds on
1 second off 3 seconds off
.1 seconds on
.5 seconds on. 5 seconds off
GEMC-Series NAC Maximum Line
Impedance: 1.8 ohms
AWG RESISTANCE
/1000 FEET
DISTANCE
WITH 2A
LOAD
(FEET)
DISTANCE
WITH 1A
LOAD
(FEET)
DISTANCE
WITH 500MA
LOAD
(FEET)
18 6.6 125 250 500
16 4.2 200 400 800
14 2.6 325 650 1300
12 1.7 500 1000 2000

Gemini C-Series GEMC-NAC Extender Installation Instructions 3
Coded Alarms / Cadences by Zone
An initiating zone can be individually programmed, using PCD-Windows Quickloader, to activate one of thirty available
coded alarms/cadences on NAC circuits.
This feature is primarily used to assist in the identification of a particular area of a large facility, such as a hospital, where
a certain section of the hospital will sound a particular code during an alarm to allow people to select the correct egress
method or path. This feature can also be used to allow schools to prevent evacuations caused by inappropriate use of
pull stations. If a pull station is activated, a person with the authority to unlock the GEMC-FK1 Fire keypad (such as a
teacher) could quickly identify the location of the activated pull station and determine whether the alarm is warranted. If
not, the authorized person would silence the alarm.
Program as follows:
1. Open the NAC/Output Assignment screen, click the NAC/Output Options tab, then check the Coded Alarms by
Zone checkbox and the Coded Alarm column appears in the Zone Assignment screen (Ctrl + Shift + Z). Select a ca-
dence for each zone, as required.
2. Program at least one silence-able NAC output (typically all NAC outputs) for Enable Cadence (in the NAC/Output As-
signment screen, click the NAC/Output Assignments tab, then check the Enable checkbox for the selected output in
the Cadence column.
Coded Alarm Type Options and Cadences
Note: Each pulse (on-off) is in total 500mS. Each inter-digit duration is 750mS. Each inter-round duration is
1.5 seconds.
In the table below, each "1" = [250mS on, 250mS off]. Each "." = [250mS off].
Short
Format Output (2 rounds shown) Short Format Output (2 rounds shown)
- Steady 1-4-4 1...1111...1111......1...1111...1111.......
1-1-1 1...1...1......1...1...1....... 2-1-1 11...1...1......11...1...1.......
1-1-2 1...1...11......1...1...11....... 2-1-2 11...1...11......11...1...11.......
1-1-3 1...1...111......1...1...111....... 2-1-3 11...1...111......11...1...111.......
1-1-4 1...1...1111......1...1...1111....... 2-1-4 11...1...1111......11...1...1111.......
1-2-1 1...11...1......1...11...1....... 2-2-1 11...11...1......11...11...1.......
1-2-2 1...11...11......1...11...11....... 2-2-2 11...11...11......11...11...11.......
1-2-3 1...11...111......1...11...111....... 2-2-3 11...11...111......11...11...111.......
1-2-4 1...11...1111......1...11...1111....... 2-2-4 11...11...1111......11...11...1111.......
1-3-1 1...111...1......1...111...1....... 2-3-1 11...111...1......11...111...1.......
1-3-2 1...111...11......1...111...11....... 2-3-2 11...111...11......11...111...11.......
1-3-3 1...111...111......1...111...111....... 10-1 1111111111...1…...1111111111...1…...
1-3-4 1...111...1111......1...111...1111....... 10-2 1111111111...11…...1111111111...11…...
1-4-1 1...1111...1......1...1111...1.......
1-4-2 1...1111...11......1...1111...11....... - ANSI 3.41 / Temporal (required in UL 985
Residential Fire installations)
1-4-3 1...1111...111......1...1111...111.......

4 Gemini C-Series GEMC-NAC Extender Installation Instructions
JUMPERS
When used with a Gemini C-Series control panel, the
jumpers on the GEMC-NACXX circuit board are used as
follows:
NAC OPTIONS: Only jumper 4 "Offset" is used if
needed. When more than total combined 4A output is
required for synchronized outputs, this jumper must be
shunted. This offsets NAC's 3 and 4 from NAC's 1 and 2
to allow instantaneous current for the synchronized de-
vices. However, note that when shunted, the strobes and
horns must not be seen or heard from within the same
area. In addition, it should be noted that if a SYNC input
from the Gemini C-Series control panel is wired, NAC's 1
and 2 will follow that SYNC 1 (terminals 1 & 2 on the PC
board), and NAC's 3 and 4 will be offset.
NAC ADDR: Allows the GEMC-NACXX to be controlled
by the Gemini C-Series control panel. The type "Fire
NAC Extender" board must be selected in Quickloader
(External Output Assignment screen), and the corre-
sponding address of the board selected in Quickloader
must be configured into these jumpers (see chart). Only
the first 40 outputs can be supervised, thus only the maxi-
mum number of GEMC-NACXX's can be used on a Gem-
ini C-Series control panel is five (5).
EZM ADDR: Use to configure the integral 4-Zone EZM to
send the status of a device (AC ON/OFF, BATTERY
GOOD/TBL, GROUND FAULT and TAMPER) to the C-
Series control panel. See page 8 for more information.
INSTALLATION
The GEMC-NACXX must be installed in accordance with
NFPA 72 and with article 760 of The National Electrical
Code as well as all applicable local codes.
When used with a Gemini C-Series control panel, install
the GEMC-NACXX as follows:
1. Select a suitable indoor dry location for the GEMC-
NACXX enclosure and 120VAC junction box, ensuring
that adequate space is available for mounting the en-
closure on a wall with no interference from wires, pipes,
or other obstructions. Mount the enclosure using fas-
teners suitable for the mounting surface. The mounting
surface must be capable of supporting the weight of the
enclosure, the enclosure door, all batteries and all other
items that may be added to the enclosure.
2. Install a 2-gang metal electrical box near the GEMC-
NACXX enclosure (ensure the gang box includes a
ground stud inside the box). A continuously-powered
120VAC source with a maximum 15A dedicated branch
circuit with grounding conductor must be wired by a li-
censed electrician in accordance with all national and
local electrical codes. The 120VAC wires must run into
this gang metal electrical box; the three 120VAC wires
are hot (black), neutral (white) and earth ground (green
or bare copper). Be sure the electrician securely con-
nects the earth ground wire to the ground stud located
inside the gang box. (This branch circuit ground must
always be first on and last off the ground stud). In addi-
tion, ensure the electrician leaves at least 6 inches of
additional white and black wiring inside the Integral
Gang Box to allow these connections to be made eas-
ily. Ensure the 120VAC branch circuit breaker is turned
off before proceeding.
3. With the white and black wires in the gang box not yet
connected, install the model GEMC-PS24V7A power
supply board inside the GEMC-NACXX enclosure.
4. Connect the GEMC-120VACH harness from the wires
"NAC ADDR" JUMPER BLOCK (J1)
ADDRESS
NUMBER OUTPUTS "NAC ADDR" JUMPER BLOCK (J1)
J1-1 J1-2 J1-3
0 FACP Operation* • • •
1 1-8 ON • •
2 9-16 • ON •
3 17-24 ON ON •
4 25-32 • • ON
5 33-40 ON • ON
*These jumper settings should not be set when used with a Gemini C-Series control panel.
LED STATUS INDICATION TABLE (for inputs, outputs & trouble memory status)
LED NAME OFF ON FLASH TYPE*
NAC 1 Normal Alarm Condition Trouble Condition (Pulse)
NAC 2 Normal Alarm Condition Trouble Condition (Pulse)
NAC 3 Normal Alarm Condition Trouble Condition (Pulse)
NAC 4 Normal Alarm Condition Trouble Condition (Pulse)
INPUT 1 Normal Alarm Condition ---
INPUT 2 Normal Alarm Condition ---
EZM STATUS No Power Power, but not receiving panel polls (Pulse is "normal")**
GND FAULT Normal Earth Ground Fault ---
PWR No Power Power present ---
*May indicate trouble condition. When trouble (open, short or ground) occurs on a specific output, the corresponding red output LED, (NAC 1 - NAC 4) will blink. Loop trouble will
report within 200 seconds.
**Flashes every time the GEMC-NACXX responds to a poll; typically once every 5 seconds as a 4-Zone NAC EXT (EZM), and once every 1 minute as a Fire NAC Extender.
AC ON AC Loss (running on battery) AC present (with or without battery power) ---
BATT TRB Normal Low Battery, no battery or charging circuit trouble ---
POLL RESP Not responding to panel polls --- LED flickers when responding to remote bus poll
RLY 5 ACTIVE Relay OFF Relay ON ---
RLY 6 ACTIVE Relay OFF Relay ON ---
RLY 7 ACTIVE Relay OFF Relay ON ---

Gemini C-Series GEMC-NAC Extender Installation Instructions 5
in the gang box to the 3-wire terminals located on the
power supply PC board.
Maintenance
The GEMC-NACXX should be tested at least once a year
for proper operation as follows:
Output Voltage Test: Under normal load conditions, the
DC output voltage should be checked for proper voltage
levels.
Battery Test: Under normal load conditions check that
the battery is fully charged. Check the voltage at the bat-
tery terminal and at the board terminal marked [-BAT +] to
insure there is no break in the battery connection wires.
Note: Maximum charging rate is 1.50A, 1.72A or 1.96A,
depending on jumper setting. Expected battery life is ap-
proximately five years, however it is recommended
changing batteries in 3 years or less if needed.
Fuse
Battery fuse is a UL Listed fuse rated 250VAC / 12.5A. If
this fuse is blown, a battery trouble will be enunciated
(refer to LED Diagnostic Table). Contact service repre-
sentative for replacement or repair. CAUTION: For con-
tinued protection against risk of fire, replace only with
the same type and rating of fuse; see WI1653.
TERMINAL DESCRIPTIONS
1. (+) INPUT 1
2. (–) INPUT 1
Isolated positive and negative synchronization inputs
used to synchronize the output of Smart devices with the
"master device" driving the input (the "master device" can
be either the C-Series control panel or other NAC extend-
ers).
If synchronizing to the C-Series control panel, wire one of
the NAC outputs to the Input 1 terminal (maximum 1000'
wire length from GEMC control panel).
If synchronization to a different NAC extender, wire one of
the NAC outputs of this other NAC extender to the Input 1
terminal (maximum 1000' wire length from GEMC control
panel). If synchronization is not needed, do not wire to
these terminals.
Use PCD-Windows Quickloader ("External Output Assign-
ment") to program at least one of the 4 GEMC-NACXX
outputs as a "Smart" device. Any NAC "Smart" output will
now be synchronized Input 1 terminal with INPUT 1. (See
the Jumper "NAC OPTIONS" in the Jumper section).
3. (+) INPUT 2
4. (–) INPUT 2
Not used in this configuration.
5. (+) NAC 1
6. (–) NAC 1
7. (+) NAC 2
8. (–) NAC 2
9. (+) NAC 3
10. (–) NAC 3
11. (+) NAC 4
12. (–) NAC 4
Terminals 5 through 12 are NAC 24V, 2A regulated su-
pervised output terminals (terminal polarity is shown in
when in an "active" alarm condition, polarity is reversed
from what is shown in "normal" standby mode). These
terminals are supervised outputs that provide low imped-
ance output to drive devices such as strobes, bells and
horns on any programmed event. In addition, these out-
puts can be used as Auxiliary outputs by programming
them for Reverse Polarity (and no triggering event).
13. (COM) OUT RELAY 5
14. (NC) OUT RELAY 5
15. (NO) OUT RELAY 5
16. (COM) OUT RELAY 6
17. (NC) OUT RELAY 6
18. (NO) OUT RELAY 6
Terminals 13-18 (and 26-28) are fully programmable re-
lays. Each relay can be programmed, using PCD-
Windows Quickloader, to be triggered on any event. In
addition, the output can be programmed for Reverse Po-
larity causing them to be normally energized, and thus de-
energized during a programmed event.
19. (+) REM (FIRE BUS)
20. (–) PWR (FIRE BUS)
21. GREEN (FIRE BUS)
22. YELLOW (FIRE BUS)
Isolated 4-wire bus terminals wired from the Gemini C-
Series control panel terminals 18-21 (maximum 1000' wire
length from GEMC control panel).
23. (+) TAMPER
24. (–) TAMPER
Housing tamper terminals. Used with a zone dedicated to
"Tamper" within the integral 4-Zone EZM; when a tamper
is detected, a report will be sent to the control panel as the
3rd zone of the EZM through the 4-wire fire bus. Use
front and back housing tamper switches, normally open
when not installed, normally closed in the circuit, and
open when activated (we recommend using a GEMC-
TAMPERKIT).
Note: The activation of Tamper is reported to the panel
using the 3rd zone of the NAC integral EZM; program the
integral EZM using the Quickloader EZM Assignment
screen and Zone Assignment screens, as shown in the
section "PROGRAMMING", as follows:
Program Zone three of the EZM (Zone # = 8 + 4
(EZM#-1) + 3) for the following:
a. Description line 1: "Tamper…OUTPUT BOARD
XX" where XX = Output board address;
b. Zone Type "Fire Tamper Monitor";
c. Adv. Code "Fire Tamper Monitor";
d. Area 1.
Note: Tamper can be disabled by not programming the
associated zone for Area 1 (Fire), thus leaving the zone
undefined with no area assigned.
25. (–) EARTH GND
This terminal is not required to be connected to earth
ground. The panel earth ground connection is provided
via the 110V ground connection to the housing through
the mounting brackets. This terminal is available for fu-
ture use.
This terminal can also be used to confirm the operation of

6 Gemini C-Series GEMC-NAC Extender Installation Instructions
the ground fault circuit; a short from this terminal to any
NAC circuit terminal should cause a ground fault, causing
the ground fault LED to light and the keypad to display a
Fire trouble ground fault with the associated zone.
26. (COM) OUT RELAY 7
27. (NC) OUT RELAY 7
28. (NO) OUT RELAY 7
These terminals are placed separately to allow high volt-
age/non-power limited wires to be connected and be iso-
lated from power-limited wires in the housing.
For descriptions of terminals 26-28, see the above de-
scriptions for terminals 13-18. Note: Non-power limited
wires must be isolated from power limited wires inside the
enclosure (at least a 1/4 inch spacing).
Battery Calculation Worksheet
Units are capable of recharging 32AH battery maximum.
PROGRAMMING
Before programming and configuring the GEMC-NACXX
NAC circuits, we suggest you plan your installation by se-
lecting the zones to be used if you plan to install an NAC
Extender and / or an EZM. The usual practice is to select
the lowest zone numbers available. The EZM program-
ming instructions below use EZM 1 (zones 9-12) as an
example; be sure to select the address numbers suitable
for your current installation.
Integral Fire NAC Extender
Configuring the integral External Outputs is performed us-
ing the "NAC ADDR" jumper block (J1) as shown on the
chart above.
Programming the integral External Outputs must be per-
formed using PCD-Windows Quickloader download soft-
ware NAC/Output Assignment screen: Click the Board
Type pull down and select Fire NAC Extender.
For programming the output options (such as Silenceable,
etc), see the section "NAC SYNCHRONIZATION
RULES" further in this manual.
Use the Integral 4-Zone EZM to Monitor GEMC-NACXX
Troubles
To program the integral EZM, PCD-Windows Quickloader
download software must be used. Before programming,
prepare PCD-Windows Quickloader as follows:
1. If not open already, open the Zone Assignment
screen by pressing Ctrl+Shift+Zon the keyboard.
2. If not open already, click View, Workspace to open
the Workspace panel. Notice the Zone Assignment
field is highlighted in the Workspace.
3. If the Zone Type column is not already displayed, click
the Show Zone Types button.
To program 4-Zone NAC Extender Troubles:
1. Open the System Assignment screen, EZM Assign-
ments tab.
2. In the Type column for the selected EZM row, click the
intersecting field and select 4-Zone NAC Ext from the
Type pull-down menu.
If EZM 1 (zones 9-12) is selected, notice the Zone As-
signment screen automatically populates each se-
lected zone with its needed attributes, namely "zFire
Monitor" for the Zone Type and a "1" for the Area, and
the following for Description and Adv. Code (Point
ID / SIA Reporting Code):
Description Adv. Code
009-NAC Ext 01 AC Fail TBL ................. AC Fail
010-NAC Ext 01 Battery TBL.................. Low Battery
011-NAC Ext 01 Tamper TBL................. Fire EZM Tamper
012-NAC Ext 01 Ground Fault TBL ........ Ground Fault
Note: Tamper zone monitoring is not required by UL
or NFPA, and the zone can be changed back to an un-
defined state, without an Area assigned to the zone.
Configuration Batteries Used Total 24V AH Maximum Available 24V
Standby Current (mA)
Maximum 24V Alarm
+ Standby
Current (A)
Fire Only with
GEMC-PS24V7A
2 12V 7AH 7 254 3.5
2 12V 8AH 8 290 4
4 12V 7AH 14 505 7
4 12V 8AH 16 580 7
6 12V 7AH 21 767 7
6 12V 8AH 24 880 7
8 12V 7AH 28 1030 7
8 12V 8AH 32 1100 7
All values are calculated used 10% de-rating factor except for the 32AH configuration, that was evaluated through test
MAXIMUM AVAILABLE STANDBY CURRENT CALCULATIONS

Gemini C-Series GEMC-NAC Extender Installation Instructions 7
WIRING
Notification Appliance Circuit Supervision
Install a 2.2K end-of-line (EOL) resistor across the last
notification appliance on each Notification Appliance Cir-
cuit to be supervised.
The Notification Appliance Circuits will not respond
unless zones or events are assigned to them.
The Gemini C-Series control panel monitors the Notifica-
tion Appliance Circuits wiring for open and short circuit
faults while the output is inactive. If these troubles occur,
a specific indication at the GEMC-FK1 keypad identifies
the NAC number; in addition, if programmed, the control
panel will send a report to the central station. These
NAC circuits also have the ability to be disabled, and
have their disabled status reported to the central station.
PROGRAMMING FOR CLASS A
The External Output Assignment screen provides the
ability to select Class A operation for NAC 1 / NAC 2
and/or Class A operation for NAC 3 / NAC 4. When se-
lected, the associated NAC's (1 & 2 or 3 & 4) must be
programmed to activate for identical events.
Each NAC circuit has a programmable 32 character de-
scription that can be associated with the circuit (displays
on the Fire keypad when the menu option "Output Di-
rectory" or "Outputs Disabled" is selected).
NAC Wiring--2 Class A Circuits
Notification Appliance Circuits, supervised and power-limited
5 6 12
11
10
97 8
+ +– –
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
NAC Wiring--4 Class B Circuits
Notification Appliance Circuits, supervised and power-limited
–+
–+
5 6 121110 97 8
+ +– –
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
+ +– –
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
EOLR
2.2K
–+
EOLR
2.2K
–+
EOLR
2.2K
–+
EOLR
2.2K
EOLR
2.2K
+ +– –
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
EOLR
2.2K
NAC 1 NAC 2 NAC 3 NAC 4 NAC 1 NAC 2 NAC 3 NAC 4
NAC Wiring--1 Class A & 2 Class B
Notification Appliance Circuits, supervised and power-limited
NAC Wiring--2 Class B & 1 Class A
Notification Appliance Circuits, supervised and power-limited
5 6 12
11
10
97 8
+ +– –
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
5 6 12
11
10
97 8
+ +– –
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
EOLR
2.2K
–+
EOLR
2.2K
EOLR
2.2K
+ +– –
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
EOLR
2.2K –+
–+
+ +– –
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
–+
EOLR
2.2K
–+
EOLR
2.2K
NAC 1 NAC 2 NAC 3 NAC 4 NAC 1 NAC 2 NAC 3 NAC 4
All NAC Output circuits
Class B (Style Y)
Class A (Style Z)

8 Gemini C-Series GEMC-NAC Extender Installation Instructions
INTEGRAL EZM ADDRESS JUMPERS
The integral EZM Address must be selected for a valid address for
the 4 system troubles to be sent back to the panel to be annunciated/
reported. Refer back to the section "PROGRAMMING" to determine
the EZM Address to configure.
The expansion zones are divided into consecutively-numbered
groups of four. Each 4-zone module comprises one group of zones.
Every module must be assigned a unique base address. The base
address number is the same as its group number.
Refer to the table below for the "EZM ADDR" address jumper set-
tings. The Base Address columns indicate the address that must be
configured with the EZM address jumpers below.
Base
Address 1 2 3 4 5 6 Zones
1 ON OFF OFF OFF OFF OFF 9-12
2 OFF ON OFF OFF OFF OFF 13-16
3 ON ON OFF OFF OFF OFF 17-20
4 OFF OFF ON OFF OFF OFF 21-24
5 ON OFF ON OFF OFF OFF 25-28
6 OFF ON ON OFF OFF OFF 29-32
7 ON ON ON OFF OFF OFF 33-36
8 OFF OFF OFF ON OFF OFF 37-40
9 ON OFF OFF ON OFF OFF 41-44
10 OFF ON OFF ON OFF OFF 45-48
11 ON ON OFF ON OFF OFF 49-52
12 OFF OFF ON ON OFF OFF 53-56
13 ON OFF ON ON OFF OFF 57-60
14 OFF ON ON ON OFF OFF 61-64
15 ON ON ON ON OFF OFF 65-68
16 OFF OFF OFF OFF ON OFF 69-72
17 ON OFF OFF OFF ON OFF 73-76
18 OFF ON OFF OFF ON OFF 77-80
19 ON ON OFF OFF ON OFF 81-84
20 OFF OFF ON OFF ON OFF 85-88
21 ON OFF ON OFF ON OFF 89-92
22 OFF ON ON OFF ON OFF 93-96
23 ON ON ON OFF ON OFF 97-100
24 OFF OFF OFF ON ON OFF 101-104
25 ON OFF OFF ON ON OFF 105-108
26 OFF ON OFF ON ON OFF 109-112
27 ON ON OFF ON ON OFF 113-116
28 OFF OFF ON ON ON OFF 117-120
29 ON OFF ON ON ON OFF 121-124
30 OFF ON ON ON ON OFF 125-128
31 ON ON ON ON ON OFF 129-132
Base
Address 1 2 3 4 5 6 Zones
32 OFF OFF OFF OFF OFF ON 133-136
33 ON OFF OFF OFF OFF ON 137-140
34 OFF ON OFF OFF OFF ON 141-144
35 ON ON OFF OFF OFF ON 145-148
36 OFF OFF ON OFF OFF ON 149-152
37 ON OFF ON OFF OFF ON 153-156
38 OFF ON ON OFF OFF ON 157-160
39 ON ON ON OFF OFF ON 161-164
40 OFF OFF OFF ON OFF ON 165-168
41 ON OFF OFF ON OFF ON 169-172
42 OFF ON OFF ON OFF ON 173-176
43 ON ON OFF ON OFF ON 177-180
44 OFF OFF ON ON OFF ON 181-184
45 ON OFF ON ON OFF ON 185-188
46 OFF ON ON ON OFF ON 189-192
47 ON ON ON ON OFF ON 193-196
48 OFF OFF OFF OFF ON ON 197-200
49 ON OFF OFF OFF ON ON 201-204
50 OFF ON OFF OFF ON ON 205-208
51 ON ON OFF OFF ON ON 209-212
52 OFF OFF ON OFF ON ON 213-216
53 ON OFF ON OFF ON ON 217-220
54 OFF ON ON OFF ON ON 221-224
55 ON ON ON OFF ON ON 225-228
56 OFF OFF OFF ON ON ON 229-232
57 ON OFF OFF ON ON ON 233-236
58 OFF ON OFF ON ON ON 237-240
59 ON ON OFF ON ON ON 241-244
60 OFF OFF ON ON ON ON 245-248
61 ON OFF ON ON ON ON 249-252
6 5 4
3
2 1
J3
EZM ADDR
Quickloader Zone Assignments
In the Quickloader, select the EZM type in the System Assign-
ment screen, click the EZM Assignments tab and select the Type
pull-down menu, select "4 Zone NAC Ext". This will cause the
associated zones to be filled with the descriptions and features
shown in the "Quickloader Zone Assignments (4 Zone NAC
Ext)" table, below.
Zn Description Zone Type Adv. Code
13 013-NAC Ext xx
AC Fail TBL zFire Monitor AC Fail
14 014-NAC Ext xx
Battery TBL zFire Monitor Low Battery
15 015-NAC Ext xx
Tamper TBL zFire Monitor Fire EZM Tamper
16 016-NAC Ext xx
Ground Fault TBL zFire Monitor Ground Fault
Quickloader Zone Assignments (4 Zone NAC Ext)

Gemini C-Series GEMC-NAC Extender Installation Instructions 9
GEMC-NACXX
PC BOARD
Single NAC Extender (Unsynchronized)
18 19 20 21
REM
PWR
(+)
4-WIRE FIRE BUS
WIRING DIAGRAMS FOR SINGLE AND MULTIPLE NAC EXTENDERS
REM
PWR
(–)
GRN YEL
GEMINI C-SERIES
MOTHERBOARD
19 20 21 22
REM
PWR
(+)
REM
PWR
(–)
GRN YEL
GEMC-NACXX
PC BOARD
Single NAC Extender (Synchronized)
18 19 20 21
REM
PWR
(+)
4-WIRE FIRE BUS
REM
PWR
(–)
GRN YEL
19 20 21 22
REM
PWR
(+)
REM
PWR
(–)
GRN YEL
GEMINI C-SERIES
MOTHERBOARD
GEMC-NACXX
PC BOARD
2 3
NAC
A
(+)
NAC A (or B-D)
NAC
A
(–)
RED
BLACK
GREEN
YELLOW
1 2
(+)
INPUT
(–)
INPUT
EOLR
2.2K
RED
BLACK
GREEN
YELLOW
Multiple NAC Extenders (Unsynchronized)
18 19 20 21
REM
PWR
(+)
4-WIRE FIRE BUS
REM
PWR
(–)
GRN YEL
GEMINI C-SERIES
MOTHERBOARD
Multiple NAC Extenders (Synchronized)
RED
BLACK
GREEN
YELLOW
4-WIRE BUS
(TERMINALS 19-22)
ON GEMC-NACXX
4-WIRE BUS
(TERMINALS 19-22)
ON GEMC-NACXX
4-WIRE BUS
(TERMINALS 19-22)
ON GEMC-NACXX
4-WIRE BUS
(TERMINALS 19-22)
ON GEMC-NACXX
18 19 20 21
REM
PWR
(+)
4-WIRE FIRE BUS
REM
PWR
(–)
GRN YEL
GEMINI C-SERIES
MOTHERBOARD
RED
BLACK
GREEN
YELLOW
2 3
NAC
A
(+)
NAC A (or B-D)
NAC
A
(–)
19 20 21 22
REM
PWR
(+)
REM
PWR
(–)
GRN YEL
GEMC-NACXX
PC BOARD
GEMC-NACXX
PC BOARD
GEMC-NACXX
PC BOARD
222120
1 2 19
1 2
(+)
INPUT
(–)
INPUT
19 20 21 22
REM
PWR
(+)
REM
PWR
(–)
GRN YEL
EOLR
2.2K
222120
1 2 19 222120 1 2 19 222120 1 2 19
GEMC-NACXX
PC BOARD
GEMC-NACXX
PC BOARD
INPUT 1

10 Gemini C-Series GEMC-NAC Extender Installation Instructions
NAC SYNCHRONIZATION RULES
The UL 864 9th edition standard includes the requirement
that all visible notification appliances in the same field of
view and all audible notification appliances in the same
notification zone operate in a synchronized manner.
The Gemini C-Series control panels and NAC extenders
comply with this standard with three different methods
that must be understood before a final installation
method is selected.
DEFINITIONS
1. NAC Circuit: One of 4 possible outputs on either the
GEMC-NACXX or GEMC-XXXMB. Each NAC circuit
can deliver UP TO 2.0A.
2. Notification Zone: A common evacuation area. Multi-
ple circuits can be in a zone.
3. Field of View: All the strobes that can be seen by an
individual at any point WITHIN the protected premises.
4. Sync Pattern: The GEMC-NACXX or GEMC-XXXMB
have two sync patterns: S1 and S2. A synchronized
NAC output must be assigned to S1 or S2. The two
sync patterns are ½ second apart as shown in Fig 1
below. S2 is referred to as the "offset" since it is offset
½ second from S1.
5. Synch Group: A collection of NAC circuits on the
GEMC-XXXMB and one or multiple GEMC-NACXX's
sharing the same sync pattern.
6. Sync Input: An input connection that allows a GEMC-
NACXX to synchronize its sync patterns to the main
panel or to another GEMC-NACXX.
Method 1 (Standard Temporal)
Most installations only require synchronized strobes and
synchronized temporal sounding appliances. The easi-
est method used to comply with this requirement is to
use either the compatible Wheelock or System Sensor
"Smart" devices, as listed in the GEMC-XXXMB installa-
tion instructions (WI1653). When these are used, the
strobes and horns can share the same NAC wires, re-
ducing the number, length and complexity of wire runs.
The following rules apply:
Rule 1: "Smart" devices must either be System Sensor
or Wheelock, but both can not be used in the same sys-
tem.
Rule 2: The total current from the combined NAC cir-
cuits on one GEMC-XXXMB or NAC7L/7S sharing the
same sync pattern cannot exceed 4A. [Example: NAC A
and B synched to S1 draw 4A and NAC C and D are off-
set using S2 for a total of 2.5A].
Rule 3: All notification appliances in the same field of
view must use the same sync pattern.
The maximum current draw from "Smart" (Synchronized)
circuits on either the GEMC-XXXMB or GEMC-NACXX
can not exceed 4A (non-synchronized NAC circuits can
draw a maximum 6.5A from the NAC's) if all visible notifi-
cation appliances are in the same field of view and all
audible notification appliances are in the same notifica-
tion zone.
However, if there are two or more Synch Groups, then
the full 6.5A maximum alarm current can be utilized by
wiring one group to the first two NAC's, wiring the second
group to the third and fourth NAC's and programming/
configuring the GEMC-XXXMB / GEMC-NACXX for
"NAC offset". This will cause the 2 pairs of NAC circuits
to activate the strobes and horns ½ a second apart.
Note: Each NAC maximum current is 2A. Warning:
Strobes not within the same sync group may never be
within the same field of view.
Rule 4: If a group of notification appliances in the same
field of view and all audible notification appliances in the
same notification zone require more than 4A, an addi-
tional GEMC-NACXX must be used and synchronized
using a dedicated NAC circuit from a master GEMC-
XXXMB or GEMC-NACXX wired to the INPUT 1 of the
slave GEMC-NACXX.
Rule 5: In large systems with multiple groups of notifica-
tion appliances in the same field of view and all audible
notification appliances in the same notification zone, the
maximum alarm current of each GEMC-XXXMB / GEMC-
NACXX can be utilized by programming / configuring the
GEMC-XXXMB / GEMC-NACXX for "NAC offset" and
grouping all non-offset outputs together and offset out-
puts together.
Small System – No NAC7L/7S Extender – Long Wire
Runs
In this example, NAC A, B, C and D are one Sync Group
using S1 supplying 4A on four circuits, with each circuit
supplying 1A. This allows the longest wire runs but
trades off against output power by limiting to 4A.
Small System – No NAC7L/7S Extender – Normal Runs
In this example, NAC A and B are one Sync Group using
S1 supplying 4A and NAC C and D are a Sync Group
using S2, offset from S1, supplying 2.5A:
v
Pa ttern
S1
Fires
Pattern
S2
Fires
Pattern
S1
Fires
Pattern
S2
Fires
0.5 Sec
Pattern
S1
Fires
0.5 Sec0.5 Sec0.5 Sec0.5 Sec
FIG. 1: TWO SYNC PATTERNS ARE ½ SECOND APART
GEMC-
XXXMB
NAC A - Sync S1 - 1 Amp
NAC B - Sync S1 - 1 Amp
NAC C - Sync S1 - 1 Amp
NAC D - Sync S1 - 1 Amp

Gemini C-Series GEMC-NAC Extender Installation Instructions 11
Large System - One GEMC-NACXX Extender
In this example, NAC A, B and C on the GEMC-XXMB
and NAC A and B on NAC7L/7S are one Sync Group us-
ing S1 supplying 8A on 4 circuits. NAC C and D on the
GEMC-XXMB and NAC C and D on the GEMC-NACXX
are a Sync Group using S2, offset from S1, supplying
4.5A on 3 circuits.
Larger System - Two GEMC-NACXX Extenders
In this example, NAC A, B and C on the GEMC-XXXMB
and NAC's A and B on each of the (2) GEMC-NACXX
extenders are one Sync Group using S1 supplying 12A
on 6 circuits. NAC C and D on the GEMC-XXXMB and
NAC's C and D on each of the (2) GEMC-NACXX's are a
Sync Group using S2, offset from S1, supplying 7.0A on
5 circuits.
Programming Method 1 (Standard Temporal):
In PCD-Windows Quickloader download software, pro-
gram as follows:
1. Do not select option "Coded Alarms by Zone" in the
NAC/Output Options screen;
2. Select "Silenceable and "Smart" for each NAC;
3. Program the selected NAC to activate on fire alarm or
specific zone alarms in the By Zone feature screen
(A-D, 1-8) or the NAC/Output Events screen.
Wiring Method 1
Use only all "Smart" Wheelock or all "Smart" System Sensor
Strobes and Horns. Note: Strobes and Horns may share
NAC's.
Method 1 Operation (Standard Temporal)
When a fire zone programmed to activate any NAC goes
into alarm, all horns on the NAC's will sound synchro-
nized temporal and all strobes will activate synchro-
nously. The horns will continue until a Fire keypad is
unlocked and the SILENCE button is pressed. Subse-
quent alarms that occur after silence, but before all fire
GEMC-
XXXMB
NAC A - Sync S1 - 2 Amps
NAC B - Sync S1 - 2 Amps
NAC C - Sync S2 - 1.25 Amps
NAC D - Sync S2 - 1.25 Amps
GEMC-
XXXMB
NAC B - Sync S1 - 2 Amps
NAC C - Sync S1 - 2 Amps
NAC D - Sync S2 - 2 Amps
GEMC-
NACXX
NAC A - Sync S1 2 Amps
NAC B - Sync S1 - 2 Amps
NAC C - Sync S2 - 1.25 Amps
NAC D - Sync S2 - 1.25 Amps
NAC A - Sync S1 0 Amps NO DEVICES
GEMC-
NACXX
(#1)
NAC A - Sync S1 2 Amps
NAC B - Sync S1 - 2 Amps
NAC C - Sync S2 - 1.25 Amps
NAC D - Sync S2 - 1.25 Amps
GEMC-
XXXMB
NAC B - Sync S1 - 2 Amps
NAC C - Sync S1 - 2 Amps
NAC D - Sync S2 - 2 Amps
NAC A - Sync S1 0 Amps NO DEVICES
GEMC-
NACXX
(#2)
NAC A - Sync S1 2 Amps
NAC B - Sync S1 - 2 Amps
NAC C - Sync S2 - 1.25 Amps
NAC D - Sync S2 - 1.25 Amps

12 Gemini C-Series GEMC-NAC Extender Installation Instructions
zones are restored, will reinitiate the cadence alarm.
The strobes will continue until the RESET button is
pressed and all fire alarms are restored.
Method 2 (Non-standard Cadence)
The second method of synchronization uses non-
standard cadences in place of the standard temporal au-
dible alarm (this configuration is uncommon).
Because the system requires synchronized strobes,
compatible Wheelock or System Sensor "Smart" strobes
must be used. Conventional 24V sounding appliances
may be used or listed Wheelock or System Sensor de-
vices that provide for a synchronized strobe input and a
separate conventional horn input (such as the Wheelock
MT series).
Strobes and horns may not be shared on the same NAC,
therefore each group of notification appliances in the
same field of view and all audible notification appliances
in the same notification zone will require at least 2
NAC's, one for the strobe device, the other for the con-
ventional audible sounders.
Note: The strobe wiring, programming and configuring
method is the same as method 1.
The horn will not be generating the temporal output and
therefore does not require synchronization. Horns on the
NAC circuits of the same GEMC-XXXMB or GEMC-
NACXX will be synchronized to each other; but they will
not be synchronized to horns wired to other GEMC-
XXXMB's or GEMC-NACXX's. It is therefore advised
that horns wired to different GEMC-XXXMB's or GEMC-
NACXX's not be placed too close together.
Current requirements for the strobes are the same as
method 1, rules 2, 3 and 4.
Programming Non-standard (Method 2) Cadences
In PCD-Windows Quickloader download software, pro-
gram as follows:
1. Do not select option "Coded Alarms by Zone" in the
NAC/Output Options screen;
2. Select "Silence-able, "Cadence "ENABLE" for each
NAC and one of the four available cadence options
in the Cadence column of the NAC/Output Assign-
ment screen;
3. Program the selected NAC to activate on fire alarm
or specific zone alarms in the By Zone feature
screen (A-D, 1-8) or the NAC/Output Events
screen
Note: All outputs selected for Cadence will only gener-
ate the single selected cadence type. NAC's can not
have different cadences.
Non-standard (Method 2) Cadence Operation:
When a fire zone, programmed to activate any NAC pro-
grammed for Coded, goes into alarm, the NAC will pro-
duce the selected Cadence type until a keypad is
unlocked and SILENCE is pressed. Subsequent alarms
that occur after silence, but before all fire zones are re-
stored will reinitiate the cadence alarm.
Method 3 (Coded Alarm by Zone)
The third method of synchronization uses coded alarms
by zone in place of the standard temporal audible alarm.
This method is requested for schools and other institu-
tions that would like to identify the device or zone that
initiated the alarm to determine the proper egress route
or to allow proper instructed authorities to quickly deter-
mine if a pull station had been improperly activated prior
to evacuation.
Because the system requires synchronized strobes,
compatible Wheelock or System Sensor "Smart" strobes
must be used. Conventional 24V sounding appliances
may be used or listed Wheelock or System Sensor de-
vices that provide for a synchronized strobe input and a
separate conventional horn input (such as the Wheelock
MT series).
Strobes and Horns may not be shared on the same NAC,
therefore each group of notification appliances in the
same field of view and all audible notification appliances
in the same notification zone will require at least 2
NAC's, one for the Strobe device, the other for the con-
ventional audible sounders.
Note: The strobe wiring, programming and configuring
method is the same as method 1.
The horn will not be generating the temporal output and
therefore does not require synchronization. Horns on the
NAC circuits of the same GEMC-XXXMB or GEMC-
NACXX will be synchronized to each other, however,
they will not be synchronized to horns wired to other
GEMC-XXXMB's or GEMC-NACXX's. It is therefore ad-
vised that horns wired to different GEMC-XXXMB's or
GEMC-NACXX's not be placed too close together.
Current requirements for the strobes are the same as
method 1, rules 2, 3 and 4.
Coded Alarm by Zone (Method 3) Programming:
1. Select option "Coded Alarms by Zone" in the NAC/
Output Options Screen
2. Select "Silence-able", "Cadence "ENABLE"" for each
NAC one of the 4 available cadence options in the Ca-
dence column of the NAC/Output Assignment screen.
3. Program the selected NAC to activate on fire alarm or
specific zone alarms in the By Zone feature screen (A-
D, 1-8) or the NAC/Output Events Screen
4. Select one of the 31 cadences for each zone in the
Zone assignment screen.
Note: "Smart" Synchronized Wheelock and System
Sensor horns are NOT synchronized with conventional
horns programmed for temporal; they must never be
placed in the same audible notification appliance notifica-
tion zone because they will not be synchronized.
Coded Alarm by Zone (Method 3) Function:
When a fire zone, programmed to activate any NAC(s)
programmed with a coded alarm type, goes into alarm,
the NAC(s) will produce the selected Coded sequence
for the zone that initiated the alarm. The coded alarm
will continue until a fire keypad is unlocked and the SI-
LENCE button is pressed. Subsequent alarms that oc-
cur after silence, but before all fire zones are restored,
will cause all NAC's programmed for cadence enable to
generate the cadence programmed for the re-initiating
alarm zone.

Gemini C-Series GEMC-NAC Extender Installation Instructions 13
OVER-CURRENT PROTECTION
GEMC-XXXMB AND GEMC-NACXX
GEMC-NACXX NAC Over-Current protection when con-
nected to a Gemini C-Series Control Panel
When the NAC is active (turned on), it will detect a cur-
rent above 6A and turn off the output within 100mS.
The output will remain off until either:
a. The load is removed from the circuit and a short is
no longer detected;
b. The fire keypad (GEMC-FK1) is unlocked and RE-
SET pressed;
c. The fire alarm has been reset and another alarm is
detected.
If, after an over-current has been detected, the fire key-
pad (GEMC-FK1) is unlocked and RESET is pressed
(or a subsequent alarm turns on the output), if the circuit
detects a current above 6A the output will be turned off
within 100mS.
Note: The system will display a NAC trouble within 200
seconds of detecting an over-current condition indicat-
ing a "RlyTbl/ E35 NN" followed by the programmed
description of the associated NAC. In addition, the as-
sociated NAC LED (1-4) on the GEMC-NACXX board
will flash to indicate the output is in trouble.
Use of the GEMC-24VR
The GEMC-24VR allows one of the four NAC outputs to
be a "regulated" 24V output supplying a constant volt-
age to Listed 24V Accessories as per the UL Standard
for Safety for Control Units and Accessories for Fire
Alarm Systems (UL 864).
To program, enable "Invert Polarity" on the selected
NAC (see the "NAC/Output Assignment" screen in
PCD-Windows Quickloader software). Refer to the
"MAXIMUM AVAILABLE STANDBY CURRENT CAL-
CULATIONS" chart earlier in this manual.

14 Gemini C-Series GEMC-NAC Extender Installation Instructions
MOUNTING AND INSTALLATION
2. INSTALL THE GEMC-24VR CIRCUIT BOARD
GEMC-24VR BOARD (ASSEMBLED VIEW)
SEE TABLE BELOW FOR NUMBER DESCRIPTIONS
Item Part No. Description Quantity
1 H448 Enclosure base 1
2 N101 6-32 kep nut 4
3 SO216 Spacer, 1/4" x .313, 6-32 tapped 4
4 PCB Boost Bus Circuit PCB 1
5 SC631 Screw, 6-32 x 7/8 pph 4
6 HW1489 Battery Shelf 1
GEMC-24VR BOARD (EXPLODED VIEW)
SEE TABLE BELOW FOR NUMBER DESCRIPTIONS
5
6
3
4
2
1
1. ROUTE CONTINUOUSLY POWERED 120VAC
If not already installed, mount a separate electrical gang box
(single or double gang) located no closer than 6 inches and
no further than 12 inches from the upper left side of the
eventual mounting location of the control panel enclosure.
A continuously-powered (un-switched) 120VAC source with
a maximum 15A dedicated branch circuit with grounding
conductor must be wired into this gang box by a licensed
electrician in accordance with all national and local electrical
codes.
ELECTRICAL
GANG BOX
Distance between gang box
and panel enclosure must be
between 6 and 12 inches.
CONTROL PANEL
ENCLOSURE
6" - 12"
into the SO216 Spacers (item 3) as shown.
2. Place the GEMC-24VR PC Board on top of the
SO216 Spacers and secure with the 6-32 kep nuts
(item 2) as shown. Do not over-tighten nuts.
The GEMC-24VR allows one of the four NAC outputs to be
a "regulated" 24V output supplying a constant voltage to
Listed 24V Accessories as per the UL Standard for Safety
for Control Units and Accessories for Fire Alarm Systems
(UL 864). Secure the GEMC-24VR printed circuit board to
the HW1489 battery "Shelf" as follows:
1. Insert four SC631 screws (item 5) such that the
threads protrude from the bottom of the HW1489
battery Shelf (item 6) as shown. Secure the screws
The images below show the installation instructions for the smaller enclosure (model GEMC-NAC7S); the larger enclosure
diagrams are similar, except the larger enclosure (model GEMC-NAC7L) includes an additional battery shelf and tamper
switches.

Gemini C-Series GEMC-NAC Extender Installation Instructions 15
MOUNTING AND INSTALLATION (CONT'D)
3. INSTALL THE GEMC-PS24V7A POWER SUPPLY BOARD
and MUST be installed.
2. Install the four male/female standoffs (item 4) as
shown, securing the fishpaper. Install the spacer
(item 7) as shown.
3. Place the power supply board over the four male/
female standoffs (item 4) and secure the board with
two locking nuts provided (item 3).
4. Install the two long brass female/female standoffs
(item 5) into the two male/female standoffs as shown.
EXPLODED VIEW OF POWER SUPPLY BOARD.
SEE TABLE BELOW FOR NUMBER DESCRIPTIONS
Note: To ensure all hardware and component mounting
holes are suitably aligned, loosen and re-tighten all pre-
installed screws as needed. The electrical gang box sup-
plying continuously-powered 120VAC must be located no
closer than 6 inches and no further than 12 inches from the
left side of the control panel housing.
Note that the power supply boards are mounted inside the
enclosure under the control panel motherboard, and there-
fore must be the first board installed in the enclosure. Also
note that the physical power supply used in your installation
may differ slightly in appearance from the image of the
power supply shown here.
Ensure the continuously-powered 120VAC source cir-
cuit breaker is turned off before proceeding.
Some items are pre-installed at the factory, but can be re-
moved if required. If re-assembly is required, proceed as
follows:
1. Place the power supply fishpaper barrier (item 6 in
illustration at left) below the four male standoffs pre-
installed into the Enclosure Base. This fishpaper pro-
vides an electrical barrier for the power supply board
Item Part No. Description QTY
1 H448 base assembly Enclosure base 1
2 PCB Power Supply Power Supply 1
3 N101 6-32 kep nut 2
4 SO211 Male / female standoff 4
5 SO133 Female / female standoff 2
6 SI175 fishpaper 1
7 SO216 Spacer, 1/4" x .313, 6-32
tapped 1
(POWER
SUPPLY
BOARD)
For more information, see
the individual installation
instructions provided with
each power supply:
GEMC-PS24V7A: WI1646

16 Gemini C-Series GEMC-NAC Extender Installation Instructions
4. INSTALL THE POWER SUPPLY SHIELDS
Power Supply Shields and Other Hardware
IMPORTANT: In the steps that follow, always ensure all
exposed metal surfaces are bonded to earth ground.
1. Secure the HW1788 Right Side Plate (item 4) and
the HW1789 Left Side Plate (item 5) to the enclo-
sure base with the 6-32 nuts (item 2). Tighten all nuts
to ensure adequate ground.
2. Secure the HW1493 Power Supply Shield (item 7)
to both the HW1788 Right Side Plate (item 4) and the
HW1789 Left Side Plate (item 5) with the SC270
screws (item 3). Tighten all screws to ensure ade-
quate electrical ground.
3. Install the HW1764 Power Supply Shield (item 6) to
the Left and Right Side Plates with the pre-installed
SC270 screws (item 3).
The keyed holes in the shield (see image below) allow
you to place the shield over the two SC270 screws (item
3) without removing them. Loosen and re-tighten to se-
cure. Be sure "Notch" is installed to the right as shown.
Hint: Through this "Notch" will run a harness (part
"9GEMCPWRHARNESS") from the power supply
board to the GEMC-NACXX PC board when this
GEMC-NACXX PC board is installed in a future step
(page 19).
INSTALLATION OF POWER SUPPLY SHIELDS
SEE TABLE BELOW FOR NUMBER DESCRIPTIONS
Item Part No. Description QTY
1 H448 Enclosure base 1
2 N101 6-32 kep nut 4
3 SC270 Screw 6-32 x .25 with washer 4
4 HW1788 Right Side Plate Assy 1
5 HW1789 Left Side Plate Assy 1
6 HW1764 Top Power Supply Shield 1
7 HW1493 Front Power Supply Shield 1
NOTCH
(POWER
SUPPLY
BOARD)
"KEYED" HOLES IN THE HW1764 POWER SUPPLY SHIELD
(ARROWS). NOTE LOCATION OF "NOTCH".
NOTCH
MOUNTING AND INSTALLATION (CONT'D)
CLOSE-UP VIEW OF INSTALLATION OF POWER SUPPLY SHIELDS.
NOTE LOCATION OF NOTCH
(POWER
SUPPLY
BOARD)
Use these
two knock-
outs to
route the
GEMC-
120VAC
harness.

Gemini C-Series GEMC-NAC Extender Installation Instructions 17
5. ROUTING THE GEMC-120VACH HARNESS FROM THE GANG BOX INTO THE CONTROL PANEL EN-
CLOSURE & POWER SUPPLY BOARD
At this point, both the control panel and electrical gang box are mounted, and the electrical gang box contains 3 wires
that provide a continuously-powered (un-switched) 120VAC source from a maximum 15A dedicated branch circuit and a
grounding conductor. The electrical gang box must be located no closer than 6 inches and no further than 12 inches from
the left side of the control panel housing. IMPORTANT: Turn off the 120VAC branch circuit breaker before proceeding.
GEMC-120VACH Harness
The GEMC-120VACH harness must run from the electrical gang box to the control panel enclosure inside either plas-
tic or metal rigid conduit. Mount this conduit between the electrical gang box
and the control panel enclosure using fasteners appropriate for the installation.
Note that one end of the GEMC-120VACH harness contains three protruding
wires (green, white and black); the other end contains a ring connector con-
nected to the green (ground) wire. Route the GEMC-120VACH into the conduit
such that the end of the harness with the ring connector is located within the
enclosure, and the other end (with the protruding wires) remain inside the elec-
trical gang box. The portion of the harness between the enclosure wall and Left Side Plate (HW1491) is protected by the
harness tubing to ensure separation between power limited wires connected to the panel and the and non-power limited
120VAC wires of the harness.
Inside the electrical gang box are the three branch circuit 120VAC wires: hot (black), neutral (white) and earth ground
(green or bare copper). As with the previous electrical connections, all of the following electrical connections must be per-
formed by a licensed electrician in accordance with all national and local electrical codes.
Connect Earth Ground
Inside the gang box, connect the branch circuit ground wire to the
GEMC-120VACH harness protruding green ground wire using a suitable
connector (such as a wire nut). Place the harness green ground ring con-
nector (located inside the control panel enclosure) on the enclosure ground
stud as shown in the illustration at right (this "branch circuit ground" must
always be first on and last off the enclosure ground stud). Secure the ring
connector to the stud with the 6-32 nut with star washer (tighten securely).
Note that the ground stud is long enough for a second ring connector and
nut, as described in the next step.
Locate the power supply ground wire (a short 14 AWG green pigtail
splice wire with a ring connector). Place this ground pigtail ring connector
on the same enclosure ground stud used in the previous step, and secure this
ring connector to the stud with another 6-32 nut with star washer (tighten securely). Lift the plastic terminal block cover
and connect the other end of the pigtail to the center terminal (marked with a ground symbol) of the GEMC-PS24V7A
power supply board.
Connect Hot and Neutral Wires
Inside the electrical gang box, connect the branch circuit white neutral and black hot wires to the white and black
wires of the GEMC-120VACH harness using suitable connectors
(such as wire nuts).
At the other end of the GEMC-120VACH harness (located inside
the control panel enclosure), connect each wire to the terminal block
of the power supply board as follows: White neutral wire to "N" right
terminal, black hot wire to "L" left terminal. Tighten all terminal screws
securely and press the terminal block cover back in place.
Enclosure Door Ground
The enclosure cover must also be connected to ground. On the
inside of the enclosure is a pre-installed ground cable. Connect this
ground cable to the earth ground stud located inside the enclosure on top of the other ground wires previously installed.
GEMC-120VACH
WHITE
BLACK
GREEN
GREEN
BLACK
WHITE
GROUND STUD LOCATION (ARROW)
(POWER
SUPPLY
BOARD)
The image displayed
here may not reflect
the actual image of the
power supply used in
your installation.
"ground
pigtail"
GEMC-120VAC
harness "Black"
GEMC-120VAC
harness "White"
GEMC-120VAC
harness "Green"
Ground
Stud
MOUNTING AND INSTALLATION (CONT'D)

18 Gemini C-Series GEMC-NAC Extender Installation Instructions
6. PREPARING THE GEMC-NACXX PC BOARD
Item Part No. Description QTY
1 PCB GEMC-NACXX PC Board 1
2 SI178 Fishpaper 1
3 HW1829 Mounting Button 2
A small folded fishpaper must be installed over the power
terminals to electrically isolate the terminals and serve as
an electrical barrier to ensure against accidental contact
with high voltage wiring. Note: This Fishpaper is only re-
quired for non-power limited wiring (i.e. 120VDC). Install
the fishpaper as follows:
MOUNTING AND INSTALLATION (CONT'D)
FISHPAPER AND TWO MOUNTING BUTTONS
SEE TABLE BELOW FOR NUMBER DESCRIPTIONS
1. Orient the SI178 Fishpaper (item 2 in the illustration be-
low) over the GEMC-NACXX power terminals such that
the fishpaper tab is aligned with the slot in the GEMC-
NACXX PC board. This slot is located next to the termi-
nals (see illustration below).
FISHPAPER ORIENTATION AND INSTALLATION
SEE TABLE AT RIGHT FOR NUMBER DESCRIPTIONS
3 2
1
POWER
TERMINALS
FINISHED FISHPAPER INSTALLATION
2. Insert the SI178 Fishpaper tab into the GEMC-NACXX
PC board slot. Ensure the two mounting holes in the
Fishpaper align with the mounting holes in the GEMC-
NACXX PC board.
3. Insert the two HW1829 Mounting Buttons into the two
mounting holes. Press the Mounting Buttons firmly to
secure.
The finished installation is shown in the image below.
USE KNOCKOUTS (ARROWS) FOR WIRING NON-POWER
LIMITED WIRING TO RELAY 7
(LEFTSIDE)
(TOP)
GRAY SHADED AREA IN ABOVE IMAGE: KEEP ALL POWER LIMITED
WIRING OUTSIDE GRAY SHADED AREA WHEN RELAY 7 IS USED TO
SWITCH NON-POWER LIMITED CIRCUITS.
(LEFT SIDE)
(TOP)

Gemini C-Series GEMC-NAC Extender Installation Instructions 19
7. INSTALLING THE GEMC-NACXX PC BOARD
Item Part No. Description QTY
1 H448 Enclosure base 1
2 SC628 Thumbscrew 2
3 WA107 #6 External Tooth Star Washer 2
4 SC270 Screw 6-32 x .25 with washer (sems) 2
5 PCB GEMC-NACXX PC Board 1
6 HW1490 Support bar 1
7 HW1764 Power Supply Shield 1
THE GEMC-NACXX PC BOARD INSTALLATION
SEE TABLE BELOW FOR NUMBER DESCRIPTIONS
Note: Some items are pre-installed at the fac-
tory. To ensure all hardware and component
mounting holes are suitably aligned, loosen and
re-tighten all pre-installed fasteners as needed.
1. Install and secure the HW1490 Support Bar
to the GEMC-NACXX PC board. The
HW1490 Support Bar is secured to the
GEMC-NACXX PC board with two 6-32
screws (item 4) as shown. Note: The
HW1490 Support Bar may be pre-installed.
2. Connect the 9GEMCPWRHARNESS power
supply harness that runs from the power
supply board to the socket located on the
GEMC-NACXX PC board. As described on
page 16, this power supply harness runs from
the power supply board, through the "Notch"
located on the HW1764 Power Supply Shield
(item 7 at left), and to the GEMC-NACXX board.
3. Slide the top edge of the GEMC-NACXX PC
board under the tabs of the HW1764 Power
Supply Shield (item 7, also shown below).
Secure the HW1490 Support Bar (now at-
tached to the GEMC-NACXX PC board) to the
HW1788 Right Side Plate and the HW1789
Left Side Plate using two thumbscrews (item
2) and two star washers (item 3) as shown.
Note the location of a second GEMC-NACXX
PC board receptacle located on the top right
side of the GEMC-NACXX PC board. In a fu-
ture step, this receptacle will connect to the
GEMC-BHMB battery harness.
ASSEMBLED VIEW. THE EDGE OF THE GEMC-NACXX PC BOARD
SLIDES UNDER THE "TABS" OF THE HW1764 POWER SUPPLY
SHIELD (ITEM 7)
7
"TAB"
(PART
HW1764)
THE HW1764 POWER SUPPLY SHIELD "TABS" (ARROWS).
2
7
(POWER
SUPPLY
BOARD)
3
MOUNTING AND INSTALLATION (CONT'D)

20 Gemini C-Series GEMC-NAC Extender Installation Instructions
8. INSTALL THE BATTERY SHELVES
If not already installed at the factory, install the HW1489 shelves for the batteries with the 6-32 nuts (N101).
Item No. Part Number Description Quantity
1 H448 base assembly Enclosure base 1
2 HW1489 Battery Shelf 1
3 N101 6-32 kep nut 2
BATTERY SHELF (HW1489) INSTALLATION
SEE TABLE BELOW FOR NUMBER DESCRIPTIONS
ASSEMBLED VIEW
SEE TABLE BELOW FOR NUMBER DESCRIPTIONS
MOUNTING AND INSTALLATION (CONT'D)