Chapter 6: Preventive maintenance and testing
112 P/N 3101890-EN • REV 006 • ISS 21JUN18
Cleaning V-PCOS detectors
Cleaning the V-PCOS detector requires opening the detector and cleaning the interior using a vacuum cleaner
and a soft brush.
To clean V-PCOS detectors:
1. Disable the detector to prevent false alarms (see “Disabling and enabling devices” on page 43).
2. Use a conventional vacuum cleaner brush to remove visible dirt and debris from the immediate area of t
he
det
ector.
3. Remove the detector from the detector base by inserting a small screwdriver into the tamper-resist acces
s
s
lot while rotating the detector counterclockwise. See Figure 39 on page 112.
4. Push the locking tab on the bottom of the detector toward the center, and then twist and pull to remove t
he
cover.
5. Using a soft brush and vacuum, carefully remove any dust and dirt from around the sensor chambers.
6. After the detector has been cleaned, reassemble and restore it to proper operation (see “Disabling an
d
enabling devices” on page 43).
7. Operate the detector for a minimum of two hours, and then restart the loop controller. When cleaned properly,
the maintenance indicators return to normal condition.
8. Check and record the detector’s dirty level reading to verify the effectiveness of cleaning. See “Device
m
aintenance reports” on page 41.
9. If cleaning is unsuccessful, return the detector to the factory and replace it with a new detector.
Figure 39: Cleaning a V-PCOS detector
2) Detector base
3) CO sensor module
(6) LED indicator
(7) Access slot for tamper-resist mechanism
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