2
IV. Precautions for engineering installation
1.
Check that the detector type matches that indicated in the construction
drawing.
2.
Calculation of protection area and installation quantity of detectors. The
protection area is about 60m
2
when the space height is 6~12m; The
protection area is about 40m
2
when the space height is below 6m.
3.
The detector installation shall comply with relevant stipulations in the
national standards GB50116-98
“
Code for design of automatic fire alarm
system
”
and GB50166-2007
“
Code for installation and acceptance of fire
alarm system
”
, for example, the horizontal distance from the detector to
the wall-beam edge shall be no less than 0.5m; there shall be no
materials within 0.5m around the detector; the horizontal distance from
the detector to the edge of the AHU air inlet shall be no less than 1.5m,
and that to the opening of the perforated air supply ceiling shall be no
less than 0.5m, etc., as shown in figure 9.
4.
When the detector is installed within the cabinet, there shall be certain
clearance between the detector and the inner wall of the cabinet, and
there shall be no materials within 0.2m around the detector, as shown in
figure 10.
Fig.10
5.
The smoke detector shall not be mounted above an electric heater or
heat radiation fan or within the air duct or air chamber, since dust and
condensation are easily generated at such places, leading to an error
reporting of the detector, as shown in figure 11.
Fig.11
6.
When the smoke detector is mounted in the room with air supply and air
return ducts, such detector shall be mounted on the path through which
the airflow goes towards the air return duct, as shown in figure 12..
Fig.12
7.
When the smoke detector must be mounted near an air inlet, a certain
distance must be kept, as shown in figure 13. Correct installation position
may enable the detector to fast and accurately detect a fire. Incorrect
installation position may cause the detector to be slow to alarm or even
issue a false alarm due to the interference of the high-speed air flow from
the air duct.
Fig.13
8.
The wiring of the smoke detector shall meet relevant electric design
codes in the national standard GB50116-98
“
Code for design of
automatic fire alarm system
”
, for example, the lines for fire control,
communication and alarm shall be protected with metal pipes and hidden
within non-combustible structures; lines of different systems, different
voltages or different currents may not be laid within one pipe or the same
slotted hole; the cable shaft of light current circuit and that of heavy
current circuit shall be arranged separately. If they must be used together
due to condition limitations, the light current circuit and the heavy current
circuit shall be respectively arranged at both sides of the shaft, etc.
V. Maintenance
1.
According to the national standard GB50166-2007
“
Code for installation
and acceptance of fire alarm system
”
, the detector shall be tested at
least once every half a year; and it is suggested to clean and maintain
the detectors in use once every two years.
2.
The work environment significantly affects the performance of the
detectors; therefore, the cycle for maintenance shall be shortened for
detectors installed and used under an environment where dust is easily
generated or high winds which affect normal use.
VI. Troubleshooting
Fault
Possible
reasons
Solutions
Remarks
Fire alarm upon
energization
Large amount
of dust or water
vapor in the
room
Re-energize
after
removing the dust
or water vapor
Internal circuit
failure
Return for repair
Does not work
and indicator
failure upon
energization
Indicator failure
or
damaged
internal circuit
Return for repair
Poor contact of
circuit
Check
and
reconnect
the
circuit
Indicator
continuously
blinks twice every
6s upon
energization
Sensor failure
Return for repair
Indicator keeps
fast blinking about
once every
second upon
energization
Significant
contamination
in the maze
Clean the detector
maze
No fire alarm
during test
Damaged
internal circuit
Return for repair
Address
：
3F, Guangcai New World Building, Nanshan Road,
Nanshan District, Shenzhen, 518054, P.R.China
Tel:+86(755)86226969 Fax: +86(755)86223939 Http://www.fhsjdz.com
Area of detecting
Protection area of every detector
detector
quantity =
Above electric hea ter or h eat
rad ia tion fan or with in air du ct
or a ir ch amber
.
Inco rre ct in stalla tion
Airflow gen erated
b y the cabine t fan
1.2m
Min. distance
Air Supply
Correct
3m
Air
Supply
（ ）
b Side Air Supply
（ ）
a
Air Supply From Ceiling
Correct
nstallation
I
Incorrect
Installation
Circulation
Air Flow
Indoor
Air Flow
Incorrect
Fig.9
