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NB983 Non-addressable gas detector
Installation
instructions
www.wizmart.com
1
32-0049-r01_2013-12
Cautions
ELECTRICAL HAZARD:
Disconnect power from equipment prior
to making any internal adjustments. Service should only be
performed by qualified personnel.
FRAGILE:
Inspect the equipment prior to installation. Do not
install the equipment if damage is apparent. Do not attempt to
disassemble this equipment. If damaged, return to the supplier.
ELECTROSTATIC HAZARD:
This is sensitive electronic
equipment. Apply safe ant-static practices when handling this
equipment.
CIRCUIT LIMITATIONS:
The maximum number of detectors
connected to a single detection zone is limited by the control and
indicating equipment, and may be limited by local regulations.
Introduction
NB983 non-addressable gas detectors are state-of-the-art
detectors suitable for connection to 4-wire non-
addressable fire detection control and indicating
equipment, or to 4-wire addressable fire detection control
and indicating equipment that can accept non-
addressable type detectors
1
.
These instructions provide trained installation personnel
with details to install and commission NB983 detectors for
optimum performance.
Preparation
Before commencing installation, ensure all equipment
(base and detector) and tools to mount and connect the
equipment are available, such as drills, mounting screws,
cables and ladders.
NB983 detectors can be installed with the following bases
and accessories.
Description
Part
number
Datasheet
8-term. 100 mm low profile base
774912
31-0003
8-term. 100 mm low profile base
774914
31-0003
8-term. 100 mm high profile base
884912
31-0003
8-term. 150 mm low profile base
784914
31-0003
27 mm recessed mounting ring
775912
31-0003
Zone monitor
NB773
31-0056
Installation
Base
The base can be mounted directly onto an electrical
junction box such as an octagonal (75 mm, 90 mm or
100 mm), a round (75 mm), or a square (100 mm) box
without using any type of mechanical adapter.
1. Feed the conductors through the middle of the base
for termination to the base contacts.
2. Mount the base on the junction box or directly onto a
flat surface.
3. Mount the base to the surface using fixing screws
that are suitable to securely fix the base to the
surface.
1
May be used in conjunction with the NB773 zone monitor
module.
Wiring
The terminals of the base will accept 0.4 mm
2
to 2.5 mm
2
conductors.
1. Strip the conductor insulation to expose 5 mm of the
conductor.
2. Connect the conductors to the base terminals (see
Fig. 1).
WARNING
: Take care to ensure the insulation does not
get clamped by the terminal contact.
Fig. 1: 4-wire base wiring connections
WARNING
: Do not short-circuit terminals 2 and 5.
3. After all the bases are installed and wired, fit the end-
of-line resistor.
Note: The value of the end-of-line resistor depends on the control
and indicating equipment to which the detectors are installed.
4. Check the wiring for continuity, short circuits and
earth faults.
Output Relay
The output relay is factory-adjusted with normally-open
contacts that close on alarm. The relay can be configured
for normally-closed operation as follows.
1. Insert a screwdriver into the rectangular hole
located on the side between the detector front
cover and the body (see Fig.
4) and rotate to
remove the front cover.
2. Remove the jumper header located adjacent to the
relay, and reinsert it in the NC position (see Fig.
2
or Fig.
3).
3. Carefully replace the front cover.
Fig. 2: Adjusting the output relay – NB983-CO
