System Sensor A310E, A320E Installation And Maintenance Instructions Manual

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© System Sensor 2008 I56-2634-004ENPittway Tecnologica S.r.l, Via Caboto 19/3, 34147 Trieste, Italy

DEUTSCH

ENGLISH

INSTALLATION AND MAINTENANCE INSTRUCTIONS

A300 SERIES ASPIRATED SMOKE DETECTOR

should be monitored using a separate monitor module to
return the fault.

A300E Series smoke detectors are powered by an external
24Vdc power supply .

With the use of an exhaust pipe, the system is IP65 rated,
allowing its use in many harsh environments, and
applications where regular hosing is performed.

CA UTION!
The A300 Series has been independently tested and
certified to CEA4022 and must be installed in strict
compliance with these instructions if the certification
is to be maintained.

SPECIFICATIONS

Number of Sensors: A310E:1 or 2 sensors. A320E: 2 sensors

(order separately, recommended: 7251 sensor).
Internal Filtration: 2 stage dust particle filter
Flow Monitoring: Thermal device, high and low thresholds.

10 element bar graph indication.

Relay fault reporting
Supply Voltage: 24VDC (Nominal) 18-30VDC (12W min)
Supply Current: 120 mA - 500 mA depending on fan speed

setting and supply voltage. Maximum

current 350mA @24VDC with no aspirating

pipe (See table 4 for typical currents/fan

speeds)
Maximum Pipe Length: 1 Chan - 100 metres

2 Chan - 2 x 100 metres

Dependant on sensor type and application
IP rating: IP53 / IP65 optional with exhaust fitted
Operating Temperature: -10°C to 50°C

Operating Humidity: 10 to 95% RH (non-condensing)
Fuse Type/Rating: ‘T’ European sub-miniature (TR5)

1.25 A Anti-surge

INTRODUCTION

There are many instances where aspirated smoke
detectors are specified, but where the very high sensitivity
that is normally inherent in these devices is an
unnecessary expense. The A300E Series Aspirated Smoke
Detector provides the perfect solution.

A300E Series aspirating smoke detectors are available in
single or dual channel formats giving a large monitored area
using sampling holes in the place of point detectors.

The A310E single channel unit has a single detection pipe,
and may be used with one smoke sensor, or two sensors
which can be configured for alarm coincidence at the panel
to simulate a ‘Double Knock’ type operation. (Note: Not
included in VdS appro val).

The A320E unit is equipped with two detection pipe
channels and should be fitted with one sensor for each
channel and can thus cover a greater area than the A310E.

A high performance aspirator and flow monitoring circuit
ensure a constant, monitored flow level which can be
displayed on a 10 element bar graph with adjustments for
high and low flow thresholds.

The A300E Series units incorporate in-line air filters to
remove dust particles from the air samples.

A300E Series Aspirating smoke detectors provide closed
loop sampling whereby the exhausted air can be
completely returned to the sampled area making them
particularly suitable for prison cells.

A300E Series Aspirating smoke detectors use one or two
standard intelligent or conventional smoke sensors which
communicate their status directly with the control panel
(Recommended: 7251 Laser Sensor). The A300E monitors
its own systems and uses relay contacts to signal system
faults. If using an intelligent fire system, these contacts

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Pipe Specification
For full details of pipe installation please see the appendix

at the back of this manual.
Smoke tests should be performed before planning and

installing the pipe network.
Material

For CEA4022 compliance, the pipe should be red ABS to
EN 50086-1 (Crush 1, Impact 1, Temp 33).

Dimensions
Metric: 25.0mmOD - 21mmID;

Imperial: 3/4"BSP (26.7mmOD - 20mmID)
Note: Both metric and imperial sizes will fit into the unit.

Lengths may be cut as required, and joined by permanent
sockets, removable socket unions or solvent welded.

The A300 inlet port is tapered to allow a push fit of the
sampling pipe. The pipe should be cut squarely to ensure a
good, airtight seal. Solvent adhesive should not be used
for this joint.

Fixings
The means of fixing the pipe to the structure will depend on

site conditions. The normal methods are pipe clips, saddle
clamps or even tie wraps. Fixing centres are typically 1.5m
apart.

Holes
The sampling pipe is perforated with sampling holes at

design spacing. These are typically 3mm and can either be
pre-drilled or drilled in situ. Care should be taken to avoid
swarf entering the pipe. It is always good practice to blow
compressed air through the pipe after drilling to clear any
debris before final connection to the equipment. In standard
configuration, with pipe hanging from ceiling, the holes will
be placed underneath, so the smoke can easily rise up into

Figure 1: A300E Series Mounting Hole Centres

INSTALLATION
A300E Series Installation

The front cover of the A300 will need to be removed to
secure the unit permanently in place. This is done using
the special key that is supplied, which fits into the screw
hole in each corner of the unit. Please keep the key in a
safe place.

The A300E should be secured to a suitable surface through
the 4 corner fixing points as shown below using suitable
fasteners, for example no.6 wood screws.

Figure 2: Capillary Tube Sample Holes

End Cap
The end of the pipe should be terminated with an end cap,

having a central hole typically 6mm in diameter.
If the end cap is not used, then practically no air will be

drawn through the side holes.
Without a hole in the end cap the contributions from the

side holes will tend to be very unbalanced.
Bends
Bends are either 45 or 90 degrees. For the 90-degree bends

it is very important that slow radii are used and not a sharp
elbow , as this will introduce unacceptable pressure losses ,
and significantly increase the response times from holes
beyond the bend.

T Pieces
A T joint can be used on pipes to produce 2 branches. It is

recommended that the total number of holes in a resulting
pipe system is no more than the number of holes estimated
for a single pipe design. For example, if a single 100M pipe
can have up to 18 holes, 2 branches can have up to 9 holes
each. It is important that the branches have a balanced
design - that is, they should be approximately equal in
length and number/size of holes). For further information,
please see the maximum pipe length/hole size data in Table
6 and the T Piece e xample shown later in the manual.

Exhaust

In most installations the exhaust should be left open, but
there are some circumstances when it may be necessary
to connect a pipe to the exhaust port to divert the exhaust
away from the location of the unit; For example to reduce
noise, reduce risk of interference/deliberate obstruction,
improved environmental protection etc.
Pipe of the same specification as the sample runs should
be used and its length limited to a maximum of 10m to avoid
significant reduction in the airflow. Care should be taken to
position the new exhaust outlet where it cannot be
accidentally or deliberately blocked.

A320E Installation

Where the two pipe A320E unit is used, it is important that
the air flow through the two pipes is balanced otherwise the
responses of the two sensors may be affected.

Figure 3: Pipe Accessories

45° AND 90° PIPE BENDS

END CAP

242 mm

1

6

7

m

m

1

8

4

m

m

259 mm

To A300 E

Ceiling

the hole. Capillary tubes can also be used with the holes as
in figure 2.

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A300E SERIES WIRING

Warning
Before working on the system, notify the proper
authorities that the system is undergoing maintenance
and will be temporarily out of service. Ensure that all
power is removed before opening the A300E unit.

Note: All wiring must be in accordance with local requirements
The A300E connections are accessed by removing the unit

cover using the supplied key, and then carefully lifting the
front display panel away from the A300E housing. The
ribbon cable that connects the front display PCB to the
main PCB may be unplugged if necessary .

The main PCB (See figure 4) includes wiring terminal
blocks for connecting the 24V power supply to the A300E
unit, accessing the fault relay contacts for each channel
and the optional loop connections.

Power Connection

The A300E unit is designed to run from a nominal 24VDC
supply. The supply should be connected to the 2 way
connector on the main circuit board ensuring that the wires
are correctly orientated. It is recommended that the wires
should be a minimum size of 16 x 0.25mm (18AWG), or
larger if the supply is further than 5m from the system.

A ferrite core is provided for EMC compliance. This should
be fitted to the supply wiring as shown below.

The current drawn is dependent on the fan speed – see
Table 4 for details.

LOOP OR ZONE CONNECTIONS FROM FIRE
DETECTION CONTROL PANEL

Figure 4: A300E SERIES Terminal La yout

ASPIRATING SYSTEM
CHANNEL 2 FAULT
CONTACTS (A320E DUAL
CHANNEL UNIT ONLY )

NO
COM
NC

NO
COM
NC

EXTERNAL POWER SUPPLY
TO ASPIRATING SYSTEM

ASPIRATING SYSTEM CHANNEL 1 FAULT
CONTACTS (BOTH A310E AND A320E)

+24VDC
0VDC

FUSE

LOOP IN (+)
LOOP IN (-)
LOOP OUT (+)
LOOP OUT (-)

Sensor Connection

The loop terminals are linked via a ribbon cable to the +/­terminals mounted on the front display PCB, which
facilitate connection to the sensor bases if required. The
necessary bases (standard base B501 type for 7251
sensors) should be mounted on the front display panel
using the M4 screws provided, with short wires connecting
to the +/- terminals if used.

Loop wiring connections are made to either the pluggable
terminal blocks or directly to sensor bases, both of which
will accept wire sizes from 1mm² to 2.5mm². For best
results, screened cable should be used. Refer to the
control panel instructions for cable type limitations.

Once wiring has been completed, the A300E unit should be
re-assembled in reverse order .

IMPORTANT

The glands on the top of the unit that provide entry for
the cabling must to be sealed to ensure that the only air
entering the unit is coming in through the sample
pipes. all wiring must pass through the cable seals
provided and no additional holes should be made. In
order to pass a cable through a seal it is necessary to
make a small hole in the centre of the seal with a
pointed implement (e.g. small screwdriver) and then
force the cable through the hole into the bo x. The small
hole will expand to accommodate any cable diameter
from 4 to 10mm and then provide an airtight seal.

Figure WF: Ho w to Fit the Ferrite

NO
COM
NC

NO
COM
NC

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T1 (-)

T1 (-)

T2 (+)

T2 (+)

B501

B501

T1 (-)

T1 (-)

T2 (+)

T2 (+)

B501

B501

(Wiring when
base #2
not fitted)

WIRING CONFIGURA TION

The A310E and A320E may be wired in several different configurations, dependant on the application and information
required. Typical configurations are shown below .

For the single channel A310E, either one or two sensors can be used (to simulate “double knock” type applications).
For the A320E dual channel system, sensor 1 monitors channel 1, and sensor 2 monitors channel 2.
See relevant sensor and module manuals for correct wiring to the device or base.

LOOP (+) IN
LOOP (-) IN
LOOP (+) OUT
LOOP (-) OUT

Sensor Arrangement 1.

See figure 5. Two analogue addressable sensors are wired through the aspirating unit. Loop connections are made to the
terminal block on the A300E main PCB.

Note: This configuration can increase the loop impedance by up to one Ohm. If this is lik ely to cause a problem, use Sensor
Arrangement 2 below .

MAIN PCB

DISPLAY PCB

Sensor Arrangement 2.

See Figure 6. The analogue sensors are connected directly to the fire control panel on the loop. The loop wiring is made
directly to the sensor bases.

SENSOR #2

SENSOR #1

A300E ASPIRATING SYSTEM ENCLOSURE

A300E ASPIRATING SYSTEM ENCLOSURE

MAIN PCB

DISPLAY
PCB

LOOP (+)
LOOP (-)

LOOP (+)
LOOP (-)

SENSOR#2

SENSOR#1

Figure 5: Wiring Configuration 1

Figure 6: Wiring Configuration 2

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T1 (-)

T1 (-)

T5 (+)

T5 (+)

B524IEFT-1

(Wiring when
base #2
not fitted)

T6 (+)

T6 (+)

T1 (-)

T1 (-)

T6 (+)

T5 (+)

T5 (+)

B524IEFT-1

T6 (+)

Using Isolator Bases

The A310E and A320E may be fitted with isolator bases (B524IEFT-1) if required. The basic configurations used on the
previous page are amended below .

Sensor Arrangement 1 with Isolator Bases

See figure 30. Analogue addressable sensors are wired through the aspirating unit. Loop connections are made to the
terminal block on the A300E main PCB.

Figure 30: Wiring Configuration 1 with Isolator Bases

A300E ASPIRATING SYSTEM ENCLOSURE

DISPLAY PCB MAIN PCB

SENSOR#2

SENSOR#1

LOOP (+) IN
LOOP (-) IN
LOOP (+) OUT

LOOP (-) OUT

Sensor Arrangement 2 with Isolator Bases

See Figure 40. The analogue sensors are connected directly to the fire control panel on the loop. The loop wiring is made
directly to the sensor bases.

Figure 40: Wiring Configuration 2 with Isolator Bases

A300E ASPIRATING SYSTEM ENCLOSURE

DISPLAY PCB

MAIN PCB

SENSOR#2

SENSOR#1

LOOP (+)
LOOP (-)

LOOP (+)
LOOP (-)

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Fault Reporting

Fault monitoring of the A300E unit should be reported back to the panel using one of the suggested input module
arrangements:

For the A310E, a single input M210E module can be used (see Figure 50).
For the A320E, a dual input M220E can be used if separate fault reporting for each channel is required (see Figure 50).

Alternatively, an M210E module can be used if common fault reporting from both channels of the A320E is sufficient within
the system (see Figure 60).

If the wiring and module must remain within the aspirating unit, an M503ME micro module can be used in place of the M210E.

47K R

47K R

4

7

K

R

Figure 50: Suggested Wiring for A310E / A320E Using M210E / M220E Module

A300E ASPIRATING SYSTEM ENCLOSURE

DISPLAY
PCB

MAIN PCB

SENSOR #2

SENSOR #1

EXTERNAL PSU +24V
EXTERNAL PSU 0V

M210E OR
M220E
INPUT
MODULE

(A320E AND
M220E ONLY )

LOOP (+)
LOOP (-)

LOOP (+)
LOOP (-)

Figure 60: Suggested Wiring f or A320E Using M210E Module (Common F ault Reporting)

A300E ASPIRATING SYSTEM ENCLOSURE

MAIN PCB

DISPLAY
PCB

EXTERNAL PSU +24V
EXTERNAL PSU 0V

SENSOR #2

SENSOR #1

LOOP (+)
LOOP (-)

M210E INPUT
MODULE

LOOP (+)
LOOP (-)