Preventive Maintenance; Mains Fuse Replacement; Firmware Upgrades - Numens 4001 Series Installation And Service Manual

4001 non-addressable control and indicating equipment
Installation and Service Manual

11.3. Preventive Maintenance

Unless the batteries have been tested and found to have sufficient capacity to fulfil the fire detection and
alarm system power requirements, replace the batteries after the manufacturer's recommended battery
service life.

11.4. Mains Fuse Replacement

The AC Mains fuse is housed in the mains wiring terminal block.
If the mains fuse is blown, replace it with 4 A / AC 250 V slow blow (20 mm).

11.5. Firmware Upgrades

The firmware includes a calculated checksum that is used to determine if the firmware has become corrupted.
If the firmware is upgraded, the checksum needs to be re-calculated. To re-calculate the checksum, undertake
the following actions and tests:
1) Enter Access Level 3.
2) Press the SOUNDERS button. Check that the ACK LED flashes.
3) Press the ACK button to confirm.
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