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VAR8-ACU and Variants - Operation, Commissioning, Fault Finding, and Maintenance Guide
25 Maintenance
To comply with BS5839 Part 8: 1998 (a Code of Practice - a recommendation) and BS EN60849: 1998 (a
Specification - a requirement), it is important that the system as a whole is operated and maintained appropriately. Please refer to these standards for detailed information.
The following routine and special maintenance activities are required, and performed by personnel defined as follows:
• ‘End user’ is the owner of the system;
• ‘Person in charge’ is the person operating the system;
• ‘Responsible person’ is the person who has been given responsibility for the system.
25.1 Training
All the standards emphasise the importance of using trained and qualified personnel.
so that reliable fault histories can be used to provide warning of pending system failures through fault trends.
An engineer needs training to appreciate the importance of this administrative function otherwise it may not get done.
It is worth noting that, as real fire conditions are infrequent, personnel involved in the operation of the system should be retrained on a regular basis.
25.2 Records
The end user or a maintainer contracted by the end user is required to keep appropriate records including installation records, and log book including maintenance records.
BS EN60849 requires that the records comprise as a minimum: a. Details of the locations of all items of equipment. b. ‘As installed’ performance measurements of the system including:
• Measured loudspeaker loading per circuit in emergency mode;
• Settings of any adjustable items within the system, including the output level of power amplifiers;
• Sound pressure levels;
• Intelligibility measurements.
A stiff-covered log book, in which all usage of the system and all fault occurrences are recorded, together with all available automatically produced records, to include: a. Dates and times of usage of the system; b. Details of tests and routine checks carried out; c. Time and date of each fault occurrence, as reported in the fault log; d. Details of the fault found and the circumstances of it being found, for example during routine maintenance; e. Action taken to rectify or remedy any faults; f. Date, time and name of person in charge of the system; g. Countersignature of the responsible person, if any faults occurred or have been rectified.
Issue: 02 complete, approved
Page 126 of 138
VAR8-ACU and Variants - Operation, Commissioning, Fault Finding, and Maintenance Guide
BS EN60849 requires a stiff-covered maintenance manual containing documented procedures that deal with the maintenance and re-test in accordance with the manufacturer’s recommendations and relevant national and international standards, and it recommends a minimum of two scheduled maintenance inspections each year.
Each day, the System should be checked for indication of normal operation as part of the fire alarm system routine maintenance. If there is a remote indicator panel for the VA system, this should also be checked.
25.3.1.2 Weekly Attention
On a weekly basis, the fire detection system should be activated and the VA system checked to ensure it operates under alarm conditions. The System should be checked for indication of normal operation and, if there is a remote indicator panel for the VA system, this should also be checked.
25.3.1.3 Monthly Attention
If an automatically started emergency generator is used as part of the standby supply, then it should be started up once each month by a simulation of a failure of the normal power supply. It should be allowed to energise the fire alarm supply for a continuous period of at least 1 hour. The System should be monitored to identify any malfunctioning caused by the use of the generator.
25.3.1.4 Quarterly Inspection and Test
The responsible person should ensure that every 3 months a competent person carries out the following checks:
1. Entries in the log book should be checked and any necessary action taken.
2. The service life of the internal RTC back-up battery should be checked and replaced if it exceeds 5 years.
3. All fault indicators and their circuits should be checked, preferably by simulation of fault conditions. The
VAR8-ACU should be visually inspected for signs of moisture ingress and other deterioration.
Any defect should be recorded in the log book and reported to the responsible person, and action should be taken to correct it.
On completion of the work, a Certificate of Testing should be completed and given to the responsible person.
25.3.1.5 Annual Inspection and Test
The responsible person should ensure that a competent person carries out the following check and test sequence every year:
1. The inspection and test routines detailed in Section “
25.3.1.4 Quarterly Inspection and Test ”.
2. A visual inspection should be made to confirm that all cable fittings and equipment are secure, undamaged and adequately protected.
Any defect should be recorded in the log book and reported to the responsible person, and action should be taken to correct it.
On completion of the work, a Certificate of Testing should be given to the responsible person.
Issue: 02 complete, approved
Page 127 of 138
VAR8-ACU and Variants - Operation, Commissioning, Fault Finding, and Maintenance Guide
25.3.1.6 Replacement of the Real Time Clock Battery
The RTC battery will require replacement at maximum intervals according to the manufacturer’s instructions
(typically 5 years).
1. Please read and observe the “
Safety and Precautions ” section on page 132 of this manual.
2. Power down the unit by disconnecting the 24 V DC power supply.
3. Disconnect the cabling and remove the unit from the rack.
4. Remove the unit’s lid by undoing the top screws.
The battery holder is clearly visible on the Router PCB.
Lithium Battery
5. Remove the battery from its clip taking care not to short circuit it.
6. Replace with type: DURACELL CR2032 or equivalent.
!
!
Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type.
Dispose of battery carefully to avoid environmental damage.
Do not dispose of battery in a fire.
7. Refit the lid.
8. Refit the unit into the rack.
9. Reconnect the wiring.
10. Power on the unit.
Issue: 02 complete, approved
Page 128 of 138
VAR8-ACU and Variants - Operation, Commissioning, Fault Finding, and Maintenance Guide
25.4.1 Action by the User after Any Fire (Whether Detected Automatically or Not)
The responsible person should ensure that the following work is carried out as soon as possible after any fire, and that normal use of the area is not resumed until the work is carried out.
1. A visual examination should be made of any part of the PA/VA system that lies within the fire area or which might have been damaged by the fire. Such parts may include the VAR8-ACU and interconnections.
2. Any defect found should be recorded in the log book and immediate action taken to correct the defect.
3. The organisation responsible for servicing the system should be informed of the fire and of any defects on the system, and instructed to carry out a check of the system.
On completion of the work, a Certificate of Testing should be given to the responsible person.
25.4.2 Action Following a Fault
If a fault has been shown to exist, either by the system’s own monitoring or by any other method, then the responsible person should ensure that the following actions are taken:
1. Determine the area affected by the fault and decide whether special action, such as fire patrols, is needed in that area;
2. If possible, determine the reason for the fault, or note the activities immediately prior to the fault in the area affected;
3. Record the fault in the log book, inform the organisation responsible for servicing, and arrange for repair.
Issue: 02 complete, approved
Page 129 of 138
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