System Sensor 2W-MOD2 User Manual

Power on. Detectors
on loop do not have
communication capability.

Power on. One or more
detectors on loop have
communication capability.

Power not applied or
module not operating
properly.

Detector on loop in alarm.

One or more detectors
out of sensitivity or in
Freeze Trouble.

Detectors on loop not
in alarm, maintenance
or Freeze Trouble.

Loop wiring fault.

EZ Walk Test mode.

Loop wiring normal.

ON

Blink 1 sec. ON
and 1 sec. OFF

OFF

ON

Blink 1 sec. ON
and 1 sec. OFF

OFF

ON
Blink 0.5 sec. ON

and 0.5 sec. OFF
OFF

GREEN LED

RED LED

YELLOW LED

LED COLOR STA TUS

CONDITION

WARNING

Condition Maintenance relay (form C) Alarm relay (form A) Loop trouble relay (form A)

Normal OFF Open Close
Loop trouble OFF Open Open
Maintenance/Freeze trouble ON Open Close
Loop trouble and ON Open Open

Maintenance/Freeze trouble
Alarm OFF Close N/A
Alarm and loop trouble OFF Close N/A
Alarm and Maintenance/Freeze OFF Close N/A

trouble
Terminal Location T e rminal 7 – N.O. Relay connected Relay connected between

Terminal 8 – Common between terminals terminals 10 and 12
Terminal 9 – N.C. 10 and 1 1

Green LED

Red LED

Y e llow LED

EZ Walk-Test
Pushbutton

INSTALLATION AND MAINTENANCE INSTRUCTIONS

Series

Loop Test/Maintenance Module

Model: 2W-MOD2

I56-2174-004

3825 Ohio Avenue, St. Charles, Illinois 60174

1-800-SENSOR2, FAX: [phone]

www.systemsensor.com

Before Installing

This information is included as a quick reference installa­tion guide. Refer to the control panel installation manual
for detailed system information. If the modules will be in­stalled in an existing operational system, inform the opera­tor and local authority that the system will be temporarily
out of service. Disconnect power to the control panel before
installing the modules.

NOTICE: This manual shall be left with the owner/user of
this equipment.

General Description

The 2W-MOD2 allows a control panel to receive a “need for
maintenance” signal from two–wire i3 series smoke detec­tors, model numbers 2W–B, 2WT–B, 2WTA–B, and 2WTR–B.
The module uses a form C zone relay to initiate “out of sen­sitivity” and “freeze trouble”, a form A zone alarm relay and
a second form A zone relay to indicate loop fault (see Figure

1). An EZ Walk Test puts all detectors on the loop into a Walk
Test mode for easy verification of detector loop wiring.

Figure 1:

NOTE: If two–wire i3 detectors are used in conjunction
with a style D initiating circuit, the 2W–MOD2 must be
used to provide that capability. Ground fault on a mod-

ule’s two-wire loop can be indicated at a control panel if
the control panel is capable of ground fault detection on
the power supply to the module and meets NFPA 72 ground
fault indication requirements for initiating device circuits.
The installer must verify that capability.

Figure 3. Module LED modes:

Figure 2. Module front view:

Three LED’s on the module provide a local visual indica­tion of the module status(es).

The maintenance module allows two-wire smoke detectors to
be used on any electrically compatible four-wire control panel.

D500-46-00 1 I56-2174-004

S0236-00

S0218-00

The module has loop trouble restoration detection. If the
loop trouble (open loop) doesn’t exist any more, the mod­ule will restore to standby condition with a maximum delay
of 1 minute. There is no delay in loop trouble detection.

If an alarm occurs while the module is indicating mainte­nance, the alarm will supercede maintenance.

If the green LED remains ON (no blinking) three minutes af­ter applying power, it means that the module has determined
that no detector on its loop has communication capability.
In this condition, the detectors are still capable of initiating
alarm and loop trouble at the module. However, maintenance
and freeze trouble, will not be indicated at the module, and
EZ walk test will not be available. If i3 detectors are installed
on the loop, verify wiring and system operation.

Control Panel

2W-MOD2

Aux. or
Smoke
Power

Fire Zone

Trouble Zone

Panel EOL

Panel EOL

12

11

10

9

8
7

1

2

3

4

5
6

Loop Style D wiring

3.9 K� EOL (must not be
used for Style D)

A2143-10

+

–

+

–

Two-wire listed smoke
detectors. Do not mix
models on the same loop.

Only one 2WTR–B per loop.
Only one 2WTA–B per loop,

unless used with the RRS–MOD.

ALL CIRCUITS ARE SUPERVISED
AND MUST BE POWER LIMITED.

Control Panel

2W-MOD2

Aux. or
Smoke
Power

Fire Zone

Panel EOL

12

11

10

9

8
7

1

2

3

4

5
6

+

–

Loop Style D wiring

ALL CIRCUITS ARE SUPERVISED
AND MUST BE POWER LIMITED.

Two-wire listed smoke
detectors. Do not mix
models on the same loop.

Only one 2WTR–B per loop.
Only one 2WTA–B per loop,

unless used with the RRS–MOD.

3.9 K� EOL (must not be
used for Style D)

A2143-10

+

–

Control Panel

2W-MOD2

Aux. or
Smoke
Power

Fire Zone

12

11

10

9

8
7

1

2

3

4

5
6

+

–

Panel EOL

Loop Style D wiring

3.9 K� EOL (must not be
used for Style D)

A2143-10

+

–

Two-wire listed smoke
detectors. Do not mix
models on the same loop.

Only one 2WTR–B per loop.
Only one 2WTA–B per loop,

unless used with the RRS–MOD.

ALL CIRCUITS ARE SUPERVISED
AND MUST BE POWER LIMITED.

For NFPA loop Style D wiring the EOL resistor is provided
internal to the module. An external EOL resistor must
not be connected at the last detector on the loop (see Fig­ures 5 – 7).

Compatibility Requirements

The 2W-MOD2 is marked with a compatibility/zone identi­fier as the last digit of a 5 digit code on the back of the unit.
To ensure proper operation, this module shall be connected
to compatible two-wire smoke detectors or the alarm con­tacts of four–wire i3 series detectors only. (Consult System
Sensor’s 2-wire compatibility guide).

Figure 4. Mounting module

Wiring Diagram

Install module wiring in accordance with appropriate wir­ing diagrams (Figures 5 - 7). Reset is performed through
power inputs 1 and 2.

Figure 5. The Module Wiring: maintenance signal is
sent to a separate zone.

S0232-01

Figure 6. The Module Wiring: maintenance signal is
indicated at the panel as a fire trouble.

S0235-00

S0233-01

Figure 7. The Module Wiring: two-wire detectors to
four-wire panel conversion.

S0238-00

S0237-00

Mounting

Install in a dry indoor location. The 2W-MOD2 Mainte­nance Module mounts directly to 4 inch square electrical
boxes (supplied by installer). The box must have a mini­mum depth of 2 1/8 inches. Secure module to box as shown
in Figure 4.

D500-46-00 2 I56-2174-004

S0234-01