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EVC-H HEAT DETECTOR
INSTRUCTION MANUAL NOV 2003
of46
NISM/EVC-H/01
01
Section 7 - MAINTENANCE AND CLEANING
Maintenance:
TheEVC-Hdetector isahighqualityproduct engineered
for reliability. In order to obtain optimum performance,
periodicmaintenanceisrequired. Ifproperpreventative
maintenance is not carried out, there is a likelihood of
malfunction, including false alarms.
Servicing:
Servicing of the system should be carried out in accord-
ance with the requirements of BS 5839 Part 1, Fire
Detection and Alarm Systems for Buildings: Code of
Practice for System Design, Installation and Servicing.
Themaintenanceproceduresdescribedbelow,should
beconductedwiththefollowingfrequency:
Onemonth after installation: RoutineInspection
andevery3months
thereafter.
Every6months: OperationalTest.
Every12months: Functional Test and
Cleaning.
Allabovefrequenciesofmaintenancearedependenton
ambient conditions.
RoutineInspection:
i) Ensure that the detector head is secure and undam-
aged.
ii) Check that the heat entry apertures are in no way
obstructed.
iii) Ensure that the surface of the detector’s outer cover
is clean. If there are deposits due to the presence of oil
vapour, dust etc, then the detector should be cleaned in
accordancewiththecleaninginstructionsdetailedlater
in this manual. It may be advisable to ensure that such
cleaningisconductedregularly in future.
iv)Ensurethatnoequipmentwhichmaygenerate
excessive heat has been installed in the vicinity of the
detector since the last routine inspection. If such
equipment has been installed, then you should notify
the Safety Officer or other competent authority that its
presence may cause false alarms.
OperationalTest
The purpose of the Operational Test is to confirm the
detector’scorrectoperation in response to aheat
condition.
i) Take any necessary precautions at the control panel
to limit the sounding of the alarm sounders/bells and
anyfireservicesummoningdevice.
ii) Test the detector with heat from a warm air gun
designed for heat detector testing (e.g. 'No Climb - Solo'
heat sensor tester). Check that the detector gives an
alarmconditionwithin10-20secondsdependingupon
thedetectorgradeandtheappliedairtemperature.
Check that the LED indicator on the detector illumi-
nates.
N.B. Hot air blowers sold for paint stripping, solder-
ingpipesetc,generatesufficientheattodamage the
detectorandshould notbeused fortestingheat
detectors.
iii) After the detector has given the alarm condition,
reset the detector from the control. It may be neces-
sary to allow some short time to elapse before resetting
the detector, to allow any residual heat from the test to
disperse.
iv) Beforeproceeding to the nextdetector, ensure that
the detector just tested does not re-operate due to the
presenceofresidual heat.
FunctionalTest:
The Functional Test checks the detectors operation.
These detectors may be returned to our factory for
FunctionalTesting.
Cleaning:
Note:ThesensorheadshouldNOTbedisassembled.
i) Carefuly remove the heat detector from its base.
ii) Use a soft, lint-free cloth, moistened with alcohol for
sticky deposits, to clean the plastic cover.
iii) Using a soft bristle brush (e.g. an artists paintbrush)
carefullybrush between thevanes and thermistorin a
linearmotionawayfrom the apertures on theplastic
case.
iv) Ensure that no debris is left on or around the ther-
mistor once cleaning is complete.
v) If the unit needs further cleaning or is damaged or
corroded,pleasereturnthecompletedetectortoNittan
(UK) Ltd. for service.
