Fire Protection | Data sheet No. 41350 | Version 01-2019 | 9 | 10
KRM-X® Duct Smoke Detector
Maintenance and repair
1. Instructions for Operation and
Maintenance
The operator is responsible for the safe function of the ven-
tilation system. He has to ensure that the smoke detectors
are always operational and properly maintained, including all
controlling components and systems.
The smoke detector must be tested at least once a year in order
to ensure that it performs reliably over long time periods. With-
out maintenance the sensor will become soiled sooner or later,
depending on environmental conditions, and will eventually
trigger an alarm, i.e. a false alarm.
All types will give a specic “maintenance due”
signal at a contamination level of 70 % (display ashes,
contamination relay drops out).
The smoke detector is equipped with a 2-digit digital contam-
ination indicator, allowing maintenance according to demand.
The smoke detector must be replaced at a contamination level
70 % or higher. The contact provided for this “contamination”
signal should be connected to the automation station.
2. Maintenance and repair work
Before starting maintenance work, it must be claried with the
sta whether the unit needs to remain responsive to smoke
while work is in progress. If a brief shutdown cannot be cannot
be tolerated for operational reasons, measures must be taken
to prevent a shutdown. If necessary, a bridge can be placed
over the alarm contact for this purpose. After completion of
maintenance work, any such bridge must be removed, and a
complete functional test of all system components must be
carried out. Any defects found must be rectied immediately.
Every maintenance check must be documented in a report, and
the results must be entered in the operation manual and signed
by the operator in charge.
Caution:
Before opening the housing, disconnect all supply voltages. The
housing may only be opened by a qualied electrician. Supply
and switching voltage ratings must be observed
Please observe the following symbols on the device:
The following work is required and can only be carried out by us
or by our authorized technicians:
1. The smoke detector can be accessed by removing the cover.
2. The detector can be removed by turning it on the base by
about 20° to the left. The detector must be replaced by a new
detector if it has reached the contamination limit (indicator
>70 %) or if the prescribed standard replacement period has
expired, whichever is earlier.
3. The following must also be cleaned:
• the cover
• the TurboTube measuring tube
• the inner housing
Caution – voltage
Turn voltage o before working on equipment.
Please follow the instructions.
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